These are the 4 digit numbers entered into an aircraft transponder, usually given by the ATC providing them with a radar service unless they are assigned them due to a specific function or displaying them to signify a specific function. These for digit codes contain digits 0 to 7 but will not contain the numbers 8 or 9. You can usually search the text on this page by using the function “CTRL+F”
Local Squawk Codes
If you are tracking aircraft in Lincolnshire I have prepared a handy 1 Page guide to Local Squawk Codes to save you time scrolling through the full list. You can download it here.
List of Secondary Surveillance Radar (SSR) Squawk Codes last updated 06/02/18
| Codes / Series | Controlling Authority / Function |
| * 0000 | SSR data unreliable |
| * 0001 | Height Monitoring Unit (See note 5) |
| * 0002 | Ground Transponder Testing (Refer to ENR 1.6, paragraph 2.2.3) |
| * 0003 | Surrey/Sussex HEMS (HLE60) |
| 0004 — 0005 | Scottish Non-standard Flights |
| * 0006 | British Transport Police ASU |
| * 0007 | Off-shore Safety Area (OSA) Conspicuity (See note 11) |
| * 0010 | Aircraft operating outside of Birmingham Controlled Airspace Zone and monitoring Birmingham Radar frequency (Refer to ENR 1.6, paragraph 2.2.5) |
| * 0011 | Aircraft operating in the vicinity of Bournemouth Control Zone and monitoring Bournemouth Radar Frequency West (Refer to ENR 1.6, paragraph 2.2.5) |
| * 0012 | Aircraft operating outside of London City Controlled Airspace and monitoring Thames Radar Frequency (Refer to ENR 1.6, paragraph 2.2.5) |
| * 0013 | Aircraft operating outside of Luton Controlled Airspace and monitoring Luton Radar Frequency (Refer to ENR 1.6, paragraph 2.2.5) |
| * 0014 | Kent Air Ambulance (HLE21) |
| * 0015 | Essex Air Ambulance (HLE07) |
| * 0016 | Thames Valley Air Ambulance (HLE24) |
| * 0017 | London Air Ambulance (HLE27) |
| * 0020 | Air Ambulance Helicopter Emergency Medivac |
| * 0021 | Fixed-wing aircraft (Receiving service from a ship) |
| * 0022 | Helicopter(s) (Receiving service from a ship) |
| * 0023 | Aircraft engaged in actual SAR Operations |
| * 0024 | Radar Flight Evaluation/Calibration (Refer to ENR 1.6, paragraph 2.2.2.2) |
| 0025 | Scottish Non-standard Flights |
| * 0026 | Special Tasks |
| * 0027 | London Control (Swanwick) Ops Crossing/Joining CAS (See note 9) |
| * 0030 | FIR Lost |
| * 0031 | Hertfordshire Air Ambulance (HLE55) |
| * 0032 | Aircraft engaged in police air support operations |
| * 0033 | Aircraft Paradropping (Refer to ENR 1.6, paragraph 2.2.2.2) |
| * 0034 | Antenna trailing/target towing |
| * 0035 | Selected Flights – Helicopters |
| * 0036 | Helicopter Pipeline/Powerline Inspection Flights |
| * 0037 | Royal Flights – Helicopters |
| * 0040 | Civil Helicopters North Sea |
| * 0041 — 0061 | Police Air Support |
| 0062 — 0077 | No 1 Air Control Centre |
| * 0100 | NATO – CAOC F (activated by NOTAM via ASACS Force Command) |
| 0101 — 0117 | Transit (ORCAM) Brussels |
| 0120 — 0137 | Transit (ORCAM) Germany |
| 0140 — 0177 | Transit (ORCAM) Amsterdam |
| * 0200 | NATO – CAOC Uedem (activated by NOTAM via ASACS Force Command) |
| 0201 — 0277 | Allocated to NATS as CCAMS redundancy |
| * 0300 | NATO – CAOC Uedem (activated by NOTAM via ASACS Force Command) |
| 0301 — 0377 | Assigned by CCAMS |
| * 0400 | NATO – CAOC Uedem (activated by NOTAM via ASACS Force Command) |
| * 0401 | RAF Leeming Conspicuity |
| 0401 — 0420 | Birmingham Approach |
| 0401 — 0437 | Ireland Domestic |
| 0401 — 0450 | Exeter Approach |
| 0401 — 0467 | RAF Lakenheath |
| 0402 — 0426 | RAF Leeming |
| 0421 — 0427 | Farnborough Radar |
| * 0427 | RAF Leeming (Topcliffe) Conspicuity |
| * 0430 | Hawarden Airport Conspicuity Code |
| 0430 — 0437 | Edinburgh Approach |
| 0430 — 0446 | Farnborough LARS West |
| 0431 — 0446 | Hawarden Approach |
| * 0440 | Edinburgh Frequency Monitoring Code (Refer to ENR 1.6, paragraph 2.2.5) |
| 0441 — 0443 | Edinburgh Approach |
| * 0447 | Farnborough LARS West (Blackbushe departures) |
| * 0450 | Blackpool Basic Service Conspicuity |
| 0450 — 0456 | Farnborough LARS West |
| *0451 | Blackpool Procedural Service Conspicuity (See note 16) |
| *0452 | Morecambe Bay Helicopter Conspicuity |
| * 0453 | Liverpool Bay Helicopter Conspicuity |
| * 0457 | Farnborough LARS West (Fairoaks departures) |
| 0460 — 0465 | Farnborough LARS West |
| *0466 | Farnborough LARS West (Fairoaks Departures) |
| 0467 | Farnborough LARS West |
| 0470 — 0477 | Allocated to NATS as CCAMS redundancy |
| * 0500 | NATO – CAOC Uedem (activated by NOTAM via ASACS Force Command) |
| 0501 — 0577 | Assigned by CCAMS |
| * 0600 | NATO – CAOC Uedem (activated by NOTAM via ASACS Force Command) |
| 0601 — 0637 | Transit (ORCAM) Germany |
| 0640 — 0677 | Transit (ORCAM) Paris |
| * 0700 | NATO – CAOC Uedem (activated by NOTAM via ASACS Force Command) |
| 0701 — 0727 | Transit (ORCAM) Maastricht |
| 0730 — 0767 | Assigned by CCAMS |
| 0770 — 0777 | Transit (ORCAM) Maastricht |
| Codes / Series | Controlling Authority / Function |
| 1000 | IFR GAT flights operating in designated Mode S Airspace |
| 1001 — 1067 | Transit (ORCAM) Spain |
| 1070 — 1077 | Assigned by CCAMS |
| * 1100 | NATO – CAOC Uedem (activated by NOTAM via ASACS Force Command) |
| 1101 — 1137 | Transit (ORCAM) Germany |
| 1140 — 1157 | Transit (ORCAM) Malta |
| 1160 — 1176 | Assigned by CCAMS |
| * 1177 | London Control (Swanwick) FIS (Refer to ENR 1.6, paragraph 2.2.2.2 and note 7) |
| * 1200 | NATO – CAOC Uedem (activated by NOTAM via ASACS Force Command) |
| 1201 — 1277 | Channel Islands Domestic |
| * 1300 | NATO – CAOC Uedem (activated by NOTAM via ASACS Force Command) |
| 1301 — 1327 | NATO – Air Policing (Air Defence Priority Flights) (See note 8) |
| 1330 — 1377 | Transit (ORCAM) Germany |
| * 1400 | NATO – CAOC Uedem (activated by NOTAM via ASACS Force Command) |
| 1401 — 1407 | Irish CCAMS Contingency Codes |
| 1410 — 1477 | Assigned by CCAMS |
| * 1500 — 1577 | NATO – CAOC Uedem (activated by NOTAM via ASACS Force Command) |
| * 1600 — 1677 | NATO – CAOC Uedem (activated by NOTAM via ASACS Force Command) |
| * 1700 — 1727 | NATO – CAOC Uedem (activated by NOTAM via ASACS Force Command) |
| 1730 — 1744 | Newquay Approach |
| 1730 — 1746 | Farnborough LARS East |
| 1730 — 1756 | RAF Coningsby |
| * 1730 — 1767 | RAF Spadeadam (See note 10) |
| 1745 | Newquay Fixed-wing |
| 1746 | Newquay Helicopters |
| * 1747 | Farnborough LARS East Conspicuity |
| * 1747 | Newquay Conspicuity |
| 1750 — 1757 | Newquay Approach |
| 1750 — 1757 | Scatsta, Shetland |
| * 1757 | RAF Coningsby Conspicuity |
| 1760 — 1777 | RAF Coningsby |
| 1760 — 1777 | RNAS Yeovilton Fighter Control |
| Codes / Series | Controlling Authority / Function |
| * 2000 | Aircraft from a non SSR environment, or on the aerodrome surface in accordance with Note 12 |
| 2001 — 2077 | Assigned by CCAMS |
| * 2100 | NATO – CAOC Uedem (activated by NOTAM via ASACS Force Command) |
| 2101 — 2177 | Transit (ORCAM) Amsterdam |
| * 2200 | NATO – CAOC Uedem (activated by NOTAM via ASACS Force Command) |
| 2201 — 2277 | Assigned by CCAMS |
| * 2300 | NATO – CAOC Uedem (activated by NOTAM via ASACS Force Command) |
| 2301 — 2377 | Transit (ORCAM) France |
| * 2400 — 2477 | NATO – CAOC Uedem (activated by NOTAM via ASACS Force Command) |
| * 2500 | NATO – CAOC Uedem (activated by NOTAM via ASACS Force Command) |
| 2501 — 2577 | Transit (ORCAM) Germany |
| * 2600 | NATO – CAOC Uedem (activated by NOTAM via ASACS Force Command) |
| 2601 — 2617 | Glasgow Approach |
| 2601 — 2637 | RAF Cranwell |
| 2601 — 2645 | MoD Boscombe Down |
| 2601 — 2657 | Irish Domestic Westbound departures and Eastbound arrivals |
| * 2620 | Glasgow Airport Frequency Monitoring Code (Refer to ENR 1.6 para 2.2.5) |
| 2621 — 2630 | Aberdeen (Sumburgh Approach) |
| 2631 — 2637 | Aberdeen (Northern North Sea Off-shore) (See note 3) |
| 2640 — 2642 | RAF Cranwell – Lincolnshire AIAA |
| 2640 — 2657 | Aberdeen (Northern North Sea Off-shore – Sumburgh Sector) (See note 3) |
| 2643 — 2644 | RAF Cranwell |
| * 2645 | RAF Cranwell Conspicuity |
| 2646 — 2647 | RAF Cranwell |
| 2646 — 2647 | MoD Boscombe Down – UAS |
| * 2650 | MoD Boscombe Down Conspicuity |
| 2650 — 2653 | Leeds Bradford Approach |
| 2651 — 2657 | MoD Boscombe Down |
| * 2654 | Leeds Bradford Conspicuity |
| 2655 — 2676 | Leeds Bradford Approach |
| * 2660 | Thruxton conspicuity |
| 2660 — 2677 | Aberdeen (Northern North Sea Off-shore) (See note 3) |
| 2661 — 2675 | Middle Wallop |
| * 2676 | Middle Wallop Conspicuity |
| 2677 | Middle Wallop Conspicuity |
| * 2677 | Aircraft operating outside of Leeds Bradford Controlled Airspace Zone and Monitoring Leeds Bradford Radar frequency (Refer to ENR 1.6, paragraph 2.2.5) |
| * 2700 | NATO – CAOC Uedem (activated by NOTAM via ASACS Force Command) |
| 2701 — 2737 | Assigned by CCAMS |
| 2740 — 2777 | Transit (ORCAM) Zurich |
| Codes / Series | Controlling Authority / Function |
| 3000 | NATO Aircraft receiving a service from AEW aircraft |
| 3001 — 3077 | Transit (ORCAM) Zurich |
| 3100 | NATO Aircraft receiving a service from AEW aircraft |
| 3101 — 3127 | Transit (ORCAM) Germany |
| 3130 — 3177 | Transit (ORCAM) Amsterdam |
| 3200 | NATO Aircraft receiving a service from AEW aircraft |
| 3201 — 3277 | Transit (ORCAM) Turkey – may also be Assigned by CCAMS |
| 3300 | NATO Aircraft receiving a service from AEW aircraft |
| 3301 — 3303 | Swanwick (Military) Special Tasks |
| 3304 — 3306 | Aircraft receiving a service from London D&D Cell |
| *3307 | D&D Conspicuity Training Fix |
| 3310 — 3367 | Swanwick (Military) |
| 3370 — 3377 | Allocated to NATS as CCAMS redundancy |
| 3400 | NATO Aircraft receiving a service from AEW aircraft |
| 3401 — 3477 | Assigned by CCAMS |
| 3500 | NATO Aircraft receiving a service from AEW aircraft |
| 3501 — 3507 | Transit (ORCAM) Luxembourg |
| 3510 — 3537 | Assigned by CCAMS |
| 3540 — 3577 | Transit (ORCAM) Berlin |
| 3600 | NATO Aircraft receiving a service from AEW aircraft |
| 3601 — 3623 | RAF Benson |
| 3601 — 3632 | Scottish ATSOCA Purposes |
| 3601 — 3634 | RAF Waddington |
| 3601 — 3647 | Jersey Approach |
| 3601 — 3657 | Cardiff Approach |
| * 3624 | RAF Benson Conspicuity |
| 3625 — 3627 | RAF Benson |
| * 3637 | Wycombe Air Park Conspicuity. Not to be used outside 20 nm from the airfield. |
| 3640 — 3645 | RAF Odiham |
| 3640 — 3666 | RAF Marham |
| 3640 — 3677 | Aberdeen (Northern North Sea Off-shore) (See note 3) |
| 3641 — 3647 | BAE Systems Warton |
| * 3646 | RAF Odiham Conspicuity |
| 3646 — 3657 | Cardiff Approach |
| 3647 — 3653 | RAF Odiham |
| * 3650 | BAE Systems Warton Conspicuity |
| 3651 — 3657 | BAE Systems Warton |
| * 3660 | Warton Aerodrome Frequency Monitoring Code (Refer to ENR 1.6, para 2.2.5) |
| 3660 — 3665 | Solent Approach (Southampton) |
| 3661 — 3677 | BAE Systems Warton |
| * 3666 | Solent Radar Conspicuity |
| * 3667 | RAF Marham – FIS Conspicuity |
| 3667 — 3677 | Solent Approach (Southampton) |
| 3700 | NATO Aircraft receiving a service from AEW aircraft |
| 3701 — 3710 | Norwich Approach |
| * 3701 — 3717 | Military aircraft under service from RN AEW aircraft in South West Approaches |
| 3701 — 3736 | RAF Brize Norton |
| 3701 — 3747 | Guernsey Approach |
| 3701 — 3767 | RAF Lossiemouth |
| 3720 — 3727 | RAF Valley |
| RAF Wittering Approach/Director | |
| 3720 — 3766 | Newcastle Approach |
| 3730 — 3736 | RAF Valley |
| 3730 — 3747 | RAF Wittering Tutor Operations |
| * 3737 | RAF Valley – Visual Recovery |
| RAF Brize Norton Approach Conspicuity | |
| 3740 — 3745 | RAF Brize Norton |
| 3740 — 3747 | RAF Valley |
| * 3750 | RAF Wittering Zone Conspicuity (Basic Service) |
| 3750 — 3751 | RAF Valley GH |
| 3750 — 3761 | TC Gatwick |
| 3751 — 3757 | RAF Wittering Zone Transits |
| 3752 | RAF Valley – RIFA |
| * 3753 | RAF Valley – Low Level Helicopters |
| * 3754 | RAF Valley – Special Tasks |
| 3755 | RAF Valley Radar Practice Force Landing (RPFL) |
| 3756 | RAF Valley Straight In Practice Force Landing (SIPFL) |
| 3757 | RAF Valley Rotary at RAF Mona |
| 3760 | RAF Wittering |
| 3760 — 3765 | RAF Valley GH |
| 3761 | RAF Wittering – Cranwell/Wittering/Cranwell VFR Transit |
| * 3762 | Shoreham ATS IFR |
| 3762 | RAF Wittering |
| * 3763 | Shoreham ATS VFR |
| 3764 — 3766 | Gatwick Tower |
| * 3767 | Redhill Approach Conspicuity |
| * 3767 | Newcastle Approach Conspicuity |
| 3770 — 3777 | Western Radar |
| Codes / Series | Controlling Authority / Function |
| 4000 | NATO Aircraft receiving a service from AEW aircraft |
| 4001 — 4077 | Transit (ORCAM) France |
| 4100 | NATO Aircraft receiving a service from AEW aircraft |
| 4101 — 4177 | Transit (ORCAM) Germany |
| 4200 | NATO Aircraft receiving a service from AEW aircraft |
| 4201 — 4214 | Assigned by CAA |
| 4215 — 4247 | Assigned by CCAMS |
| 4250 — 4257 | Belfast City Approach |
| 4250 — 4267 | Aberdeen Approach |
| 4250 — 4277 | Humberside Approach |
| 4300 | NATO Aircraft receiving a service from AEW aircraft |
| 4301 — 4305 | Assigned by CAA |
| * 4306 | Lee-on-Solent Conspicuity |
| 4307 — 4317 | London Control Non-Standard Flights |
| 4320 — 4327 | Ireland Domestic |
| RNAS Yeovilton | |
| 4330 — 4337 | UK Domestic (Prestwick Centre Special Sector Codes) |
| 4340 — 4353 | UK Domestic (Scottish Special Sector Codes) |
| * 4354 — 4356 | Westland Helicopters Yeovil |
| 4357 | Ireland Domestic |
| * 4357 | RNAS Yeovilton Conspicuity |
| * 4360 — 4361 | Coventry Airport Conspicuity |
| 4360 — 4361 | Oil Survey Helicopters – Faeroes/Iceland Gap |
| * 4360 — 4367 | Westland Helicopters Yeovil |
| 4360 — 4367 | RAF Northolt |
| 4362 — 4367 | Coventry Approach |
| 4370 — 4377 | Anglia Radar |
| Ireland Domestic | |
| RNAS Yeovilton | |
| 4400 | NATO Aircraft receiving a service from AEW aircraft |
| 4401 — 4427 | Transit (ORCAM) Brussels |
| 4430 — 4477 | Assigned by CCAMS |
| 4500 | NATO Aircraft receiving a service from AEW aircraft |
| * 4501 | Lands End GNSS Approach (See note 17) |
| * 4501 | Wattisham Conspicuity |
| 4501 — 4505 | RAF Linton-on-Ouse |
| 4501 — 4516 | Oxford Approach |
| 4501 — 4517 | Prestwick Approach |
| 4502 — 4547 | Wattisham Approach |
| *4506 | RAF Linton-on-Ouse Conspicuity |
| 4507 — 4527 | RAF Linton-on-Ouse |
| * 4517 | Oxford SSR Frequency Monitoring Code (Refer to ENR 1.6, paragraph 2.2.5). |
| * 4520 | Prestwick Conspicuity |
| * 4520 | Oxford Approach Basic Service |
| * 4521 — 4527 | West Wales Radar (NQY) |
| * 4530 | RAF Linton-on-Ouse Conspicuity |
| * 4530 | MoD Aberporth Conspicuity |
| 4530 — 4546 | Plymouth (Military) Radar |
| 4531 — 4537 | RAF Linton-on-Ouse |
| 4531 — 4537 | MoD Aberporth |
| * 4540 | RAF Linton-on-Ouse Conspicuity |
| * 4540 — 4542 | MoD Aberporth (See note 13) |
| 4541 — 4547 | RAF Linton-on-Ouse |
| * 4543 | West Wales Airport UAS Conspicuity Code. Shall only be selected with AFIS direction. |
| * 4547 | Plymouth (Military) Radar conspicuity |
| 4550 — 4567 | Plymouth (Military) Radar |
| 4550 — 4567 | Isle of Man |
| 4550—4570 | East Midlands Approach |
| * 4571 | East Midlands LARS Basic Service Conspicuity |
| * 4572 | Aircraft operating outside of East Midlands Controlled Airspace/Zone and monitoring East Midlands Radar frequency (Refer to ENR 1.6, paragraph 2.2.5) |
| * 4572 | Farnborough LARS West SSR Monitoring Code (Refer to ENR 1.6, paragraph 2.2.5) |
| * 4573 | Costock Helicopters operating inside East Midlands CTR – Conspicuity |
| * 4574 | Not currently allocated for use in the UK FIR |
| * 4575 | RAF Leeming/RAF Linton-on-Ouse (See note 4) |
| Southend Airport Conspicuity | |
| * 4576 | RAF Colerne Conspicuity (See note 6) |
| * 4576 | Vale of York AIAA Conspicuity |
| 4577 | Vale of York AIAA Conspicuity |
| 4600 | NATO Aircraft receiving a service from AEW aircraft |
| * 4601 | MoD Ops in Salisbury Plain Training Area (See note 14) |
| 4602 — 4607 | Anglia Radar |
| * 4607 | Hawarden Frequency Monitoring Code (Refer to ENR 1.6 para 2.2.5) |
| 4610 — 4667 | Swanwick (Military) |
| 4670 — 4676 | TC Stansted/TC Luton |
| * 4677 | Carlisle Airport Conspicuity |
| Luton Airport Tower Conspicuity | |
| 4700 | NATO Aircraft receiving a service from AEW aircraft |
| 4701 — 4777 | Assigned by CCAMS |
| Codes / Series | Controlling Authority / Function |
| 5000 | NATO Aircraft receiving a service from AEW aircraft |
| 5001 — 5012 | London Control Non-Standard Flights |
| 5013 — 5017 | Assigned by CCAMS |
| 5020 — 5036 | Farnborough LARS North |
| * 5037 | Farnborough LARS North Conspicuity |
| 5040 — 5047 | Assigned by CAA |
| * 5050 | Liverpool Conspicuity |
| * 5050 | Aircraft operating in the vicinity of Southend Zone and monitoring the Southend Radar Frequency 130.775 MHz (Refer to ENR 1.6, paragraph 2.2.5) |
| 5050 — 5067 | Bristol Approach |
| Southend Approach | |
| 5051 — 5067 | Liverpool Airport |
| * 5060 | Aircraft operating in vicinity of Liverpool Zone and monitoring the Liverpool Radar Frequency 119.850 MHz (Refer to ENR 1.6, paragraph 2.2.5) |
| * 5070 | Bristol VFR Conspicuity |
| * 5070 — 5071 | RAF Syerston Conspicuity |
| 5071 — 5076 | Bristol Approach |
| * 5077 | Bristol Frequency Monitoring Code (Refer to ENR 1.6, paragraph 2.2.5) |
| 5100 | NATO Aircraft receiving a service from AEW aircraft |
| 5101 — 5177 | CRC Boulmer |
| 5200 | NATO Aircraft receiving a service from AEW aircraft |
| 5201 — 5270 | Assigned by CCAMS |
| 5271 — 5277 | Transit (ORCAM) Channel Islands |
| 5300 | NATO Aircraft receiving a service from AEW aircraft |
| 5301 — 5377 | Transit (ORCAM) Barcelona |
| 5400 | NATO Aircraft receiving a service from AEW aircraft |
| 5401 — 5477 | Assigned by CCAMS |
| 5500 | NATO Aircraft receiving a service from AEW aircraft |
| 5501 — 5577 | Transit (ORCAM) Barcelona |
| 5600 | NATO Aircraft receiving a service from AEW aircraft |
| 5601 — 5647 | Transit (ORCAM) Paris |
| 5650 — 5657 | Transit (ORCAM) Luxembourg |
| 5660 — 5664 | Allocated to NATS as CCAMS redundancy |
| 5665 — 5677 | Assigned by CCAMS |
| 5700 | NATO Aircraft receiving a service from AEW aircraft |
| 5701 — 5777 | Transit (ORCAM) Geneva |
| Codes / Series | Controlling Authority / Function |
| * 6000 | NATO – CAOC Uedem (activated by NOTAM via ASACS Force Command) |
| * 6001 — 6037 | Special Events (Activated by NOTAM) |
| 6040 — 6077 | Swanwick (Military) |
| * 6100 | NATO – CAOC Uedem (activated by NOTAM via ASACS Force Command) |
| 6101 — 6157 | Swanwick (Military) |
| * 6160 | Doncaster Sheffield Conspicuity |
| 6160 — 6176 | Inverness Approach |
| 6160 — 6176 | Cambridge Approach |
| 6160 — 6177 | Plymouth (Military) Radar |
| 6161 — 6167 | Doncaster Sheffield Approach |
| * 6170 | Aircraft operating outside of Doncaster Sheffield Controlled Airspace Zone and Monitoring Doncaster Sheffield Radar frequency (Refer to ENR 1.6, paragraph 2.2.5) |
| 6171 — 6177 | Doncaster Sheffield Approach |
| * 6177 | Cambridge Conspicuity |
| * 6177 | Inverness Conspicuity |
| * 6200 | NATO – CAOC Uedem (activated by NOTAM via ASACS Force Command) |
| 6201 — 6257 | Assigned by CCAMS |
| 6260 — 6277 | Transit (ORCAM) Amsterdam |
| * 6300 | NATO – CAOC Uedem (activated by NOTAM via ASACS Force Command) |
| 6301 — 6377 | Assigned by CCAMS |
| * 6400 | NATO – CAOC Uedem (activated by NOTAM via ASACS Force Command) |
| 6401 — 6457 | Swanwick (Military) Radar |
| 6460 — 6467 | Assigned by CCAMS – Not in use in the UK as these codes cause conflictions with France |
| 6470 — 6477 | Allocated to NATS as CCAMS redundancy |
| * 6500 | NATO – CAOC Uedem (activated by NOTAM via ASACS Force Command) |
| 6501 — 6577 | CRC Scampton |
| * 6600 | NATO – CAOC Uedem (activated by NOTAM via ASACS Force Command) |
| 6601 — 6677 | Transit (ORCAM) Germany |
| * 6700 | NATO – CAOC Uedem (activated by NOTAM via ASACS Force Command) |
| 6701 — 6777 | Transit (ORCAM) France |
| Codes / Series | Controlling Authority / Function |
| * 7000 | General conspicuity code (Refer to ENR 1.6, paragraph 2.2.2.2) |
| * 7001 | Military Fixed-wing Low Level Conspicuity/ Climb-out (Refer to ENR 1.6, paragraph 2.2.2.2) |
| * 7002 | Danger Areas General |
| * 7003 | Red Arrows Transit/Display |
| * 7004 | Conspicuity Aerobatics and Display (Refer to ENR 1.6, paragraph 2.2.2.2) |
| * 7005 | High-Energy Manoeuvres |
| * 7006 | Autonomous Operations within TRA and TRA (G) (Refer to ENR 1.6, paragraph 2.2.2.2) |
| 7007 | Open Skies Observation Aircraft |
| * 7010 | Operating in Aerodrome Traffic Pattern (Refer to ENR 1.6, paragraph 2.2.2.2) |
| * 7011 | Aircraft operating outside of Southampton Zone and monitoring Solent Radar frequencies (Refer to ENR 1.6, paragraph 2.2.5) |
| * 7011 — 7013 | Assigned by CAA |
| * 7012 | Aircraft operating outside of Gatwick Controlled Airspace and monitoring Gatwick Radar Frequency South |
| * 7013 | Aircraft operating outside of Stansted Controlled Airspace and monitoring Essex Radar Frequency |
| 7014 — 7017 | Allocated to NATS as CCAMS redundancy |
| 7020 — 7027 | Assigned by CCAMS |
| * 7030 | RNAS Culdrose Conspicuity |
| 7030 — 7044 | Aldergrove Approach |
| 7030 — 7046 | TC Thames/TC Heathrow |
| 7030 — 7066 | Durham Tees Valley Airport |
| 7030 — 7077 | Aberdeen (Northern North Sea Off-shore) (See note 3) |
| 7031 — 7077 | RNAS Culdrose |
| * 7045 | Aircraft operating within 40 miles of Belfast/Aldergrove, operating outside of Belfast/Aldergrove CTR/Belfast TMA and monitoring Belfast/Aldergrove Approach frequency (Refer to ENR 1.6, para 2.2.5) |
| 7046 — 7047 | Aldergrove Approach |
| * 7047 | TC Thames (Biggin Hill Airport Conspicuity) |
| RNAS Culdrose Conspicuity | |
| 7050 — 7056 | TC Thames/TC Heathrow |
| * 7057 | TC Thames (London City Airport Conspicuity) |
| * 7066 | Lydd Approach VFR |
| * 7067 | Durham Tees Valley Airport Conspicuity |
| Lydd Approach IFR | |
| 7070 — 7076 | TC Thames/TC Heathrow |
| * 7077 | TC Thames (London Heliport Conspicuity) |
| * 7100 | SSR Code Saturation |
| 7101 — 7177 | Transit (ORCAM) Brussels |
| 7200 | RN Ships |
| 7201—7267 | Allocated to NATS as CCAMS redundancy |
| 7270 — 7277 | Assigned by CCAMS |
| * 7300 | UAS/RPA Lost Link (See note 15) |
| 7301 — 7327 | Assigned by CCAMS |
| 7330 — 7347 | Transit (ORCAM) Netherlands |
| * 7350 | Norwich Approach Conspicuity |
| 7350 — 7353 | RNAS Culdrose |
| 7350 — 7361 | MoD Ops in EG D701 (Hebrides) |
| 7350 — 7364 | Manchester Approach |
| 7350 — 7376 | Bournemouth Approach/LARS |
| 7351 — 7377 | Norwich Approach |
| * 7354 — 7355 | RNAS Culdrose Conspicuity |
| 7356 | RNAS Culdrose |
| *7357 | RNAS Culdrose Conspicuity |
| 7360—7367 | RNAS Culdrose |
| * 7362 | MoD Ops in EG D702 (Fort George) |
| * 7365 | Manchester Barton Conspicuity |
| * 7366 | Aircraft operating within 5 nm of Manchester CTR and maintaining a listening watch only on the Manchester Approach frequency (Refer to ENR 1.6, paragraph 2.2.5) |
| 7367 — 7373 | Manchester Approach |
| * 7374 | Dundee Airport IFR Procedural Approach |
| * 7375 | Manchester TMA and Woodvale Local Area |
| (Woodvale UAS Conspicuity) | |
| * 7376 | Dundee Airport VFR Conspicuity |
| * 7377 | Bournemouth Radar Conspicuity |
| * 7400 | MPA/DEFRA/Fishery Protection/METMAN |
| (Civil Contingency) Conspicuity | |
| * 7401 | Scottish FIS (Refer to ENR 1.6, paragraph 2.2.2.2) |
| * 7402 | RAF Leuchars Conspicuity |
| 7402 — 7414 | TC Stansted/TC Luton |
| 7402 — 7417 | RAF Shawbury |
| 7402 — 7436 | RNAS Yeovilton |
| 7402 — 7437 | Anglia Radar |
| 7403 — 7427 | RAF Leuchars |
| * 7417 | Cranfield Airport – IFR Conspicuity Purposes |
| * 7420 | RAF Shawbury Conspicuity |
| 7421 — 7425 | RAF Shawbury |
| * 7426 | RAF Shawbury Conspicuity |
| 7427 — 7437 | RAF Shawbury |
| * 7437 | RNAS Yeovilton Conspicuity |
| 7440 — 7477 | Transit (ORCAM) France |
| * 7500 | Special Purpose Code – Hi-Jacking |
| 7501 — 7507 | Assigned by CCAMS |
| 7510 — 7535 | Transit (ORCAM) Switzerland |
| 7536 — 7537 | Assigned by CCAMS |
| 7540 — 7547 | Transit (ORCAM) Germany |
| 7550 — 7567 | Transit (ORCAM) Paris |
| 7570 — 7577 | Assigned by CCAMS |
| * 7600 | Special Purpose Code – Radio Failure |
| 7601 — 7617 | Allocated to NATS as CCAMS Redundancy (Prestwick Upper) |
| 7620 — 7677 | Assigned by CCAMS |
| * 7700 | Special Purpose Code – Emergency |
| 7701 — 7775 | Assigned by CCAMS |
| * 7776 — 7777 | SSR Monitors (Refer to ENR 1.6, paragraph 2.2.4) |