Squawk codes
To: 1000 2000 3000 4000 5000 6000 7000
0000. SSR data unreliable
0001. Height Monitoring Unit
0002. Ground Transponder Testing
0003-0005 Not allocated
0006. British Transport Police ASU
0007. Off-shore Safety Area (OSA) Conspicuity
0010. Aircraft operating outside of Birmingham CAS and monitoring Birmingham Radar
0011. Solent Monitoring Code
0012. Aircraft operating outside of EGLL/EGLC/EGKK CAS and monitoring Thames/Gatwick Radar
0013. Aircraft operating outside of Luton/Stansted CAS and monitoring Luton/Essex Radar
0014. Kent Air Ambulance (HMD21)
0015. Essex Air Ambulance (HMD07)
0016. Thames Valley Air Ambulance(HMD24)
0017. Virgin HEMS (HMD27)
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
0025. Not allocated
0026. Special Tasks (Mil) - activated under Special Flight Notification (SFN)
0027. London AC (Swanwick) Ops Crossing/Joining CAS
0030. FIR Lost
0031. An aircraft receiving a radar service from Scottish D & D centre
0032. Aircraft engaged in police air support operations
0033. Aircraft Paradropping
0034. Antenna trailing/target towing
0035. Selected Flights - Helicopters
0036. Helicopter Pipeline/Powerline Inspection Flights
0037. Royal Flights - Helicopters
0040. Civil Helicopters North Sea
0041-0042 Greater Manchester Police ASU
0043-0044 Metropolitan Police ASU
0045. Sussex Police ASU
0046. Essex Police ASU
0047. Surrey Police ASU
0050. Chiltern Police ASU (Western Base)
0051. Chiltern Police ASU (Eastern Base)
0052. Norfolk Police ASU
0052. West Yorkshire Police ASU
0053. Suffolk Police ASU
0053. South Yorkshire Police ASU
0054. Cambridgeshire Police ASU
0054. Merseyside Police ASU
0054. South and East Wales Police ASU
0055. Cleveland Police ASU
0055. Cheshire Police ASU
0056. Northumbria Police ASU
0056. North Midlands Police ASU
0057. Strathclyde Police ASU
0057. Humberside Police ASU
0057. East Midlands Police ASU
0060. West Midlands Police ASU
0061. Lancashire Police ASU
0061. Western Counties Police ASU
0062-0077 No 1 Air Control Centre
0100. NATO - CAOC 9 Exercises (activated by NOTAM)
0101-0117 Transit (ORCAM) Brussels
0120-0137 Transit (ORCAM) Germany
0140-0177 Transit (ORCAM) Amsterdam
0200. NATO - CAOC 9 Exercises (activated by NOTAM)
0201-0213 TC Stansted/TC Luton
0201-0217 RAF Leuchars
0201-0257 Ireland Domestic
0201-0257 RNAS Yeovilton
0220. RAF Leuchars Conspicuity
0220-0237 RAF Shawbury
0221-0247 RAF Leuchars
0224-0243 Anglia Radar
0240. RAF Shawbury Conspicuity
0241-0246 RAF Shawbury
0244. North Denes Conspicuity
0245-0267 Anglia Radar
0247. Cranfield Airport - IFR Conspicuity Purposes
0260. Liverpool Airport Conspicuity
0260-0261 Coventry Airport Conspicuity
0260-0261 Oil Survey Helicopters - Faeroes/Iceland Gap
0260-0267 Westland Helicopters Yeovil
0260-0267 RAF Northolt
0261-0267 Liverpool Airport
0270-0277 Superdomestic - Ireland to UK, Germany and Benelux
0300. NATO - CAOC 9 Exercises (activated by NOTAM)
0301-0377 Transit (ORCAM) UK
0400. NATO - CAOC 9 Exercises (activated by NOTAM)
0401. RAF Leeming Conspicuity
0401. Shoreham Approach Procedural
0401-0420 Birmingham Approach
0401-0430 Exeter Approach
0401-0437 Ireland Domestic
0401-0467 RAF Lakenheath
0402-0416 RAF Leeming
0421-0446 Farnborough Radar/LARS
0427. RAF Leeming (Topcliffe) Conspicuity
0430-0443 Edinburgh Approach
0447. Farnborough LARS - Blackbushe Departures
0450-0456 Blackpool Approach
0450-0456 Farnborough Radar/LARS
0457. Blackpool Approach (Liverpool Bay and Morecambe Bay Helicopters)
0457. Farnborough LARS - Fairoaks Departures
0460-0466 Blackpool Approach
0460-0467 Farnborough Radar/LARS
0467. Blackpool Approach (Liverpool Bay and Morecambe Bay Helicopters)
0470-0477 UK Domestic
0500. NATO - CAOC 9 Exercises (activated by NOTAM)
0501-0577 Transit (ORCAM) UK
0600. NATO - CAOC 9 Exercises (activated by NOTAM)
0601-0637 Transit (ORCAM) Germany
0640-0677 Transit (ORCAM) Paris
0700. NATO - CAOC 9 Exercises (activated by NOTAM)
0701-0777 Transit (ORCAM) Maastricht
1000. IFR GAT flights operating in designated Mode S Airspace
1001-1077 Transit (ORCAM) Spain
1100. NATO - CAOC 9 Exercises (activated by NOTAM)
1101-1137 Transit (ORCAM) Rhein
1140-1177 Transit (ORCAM) UK
1177. London AC (Swanwick) FIS
1200. NATO - CAOC 9 Exercises (activated by NOTAM)
1201-1277 Channel Islands Domestic
1300. NATO - CAOC 9 Exercises (activated by NOTAM)
1301-1327 NATO - Air Policing
1330-1357 Transit (ORCAM) Bremen
1360-1377 Transit (ORCAM) Munich
1400. NATO - CAOC 9 Exercises (activated by NOTAM)
1401-1407 UK Domestic
1410-1437 Superdomestic - Shannon to UK
1440-1477 Superdomestic - Dublin to UK
1500-1577 NATO - CAOC 9 Exercises (activated by NOTAM)
1601-1677 NATO - CAOC 9 Exercises (activated by NOTAM)
1701-1727 NATO - CAOC 9 Exercises (activated by NOTAM)
1730-1746 Newquay Approach
1730-1756 RAF Coningsby
1730-1767 RAF Spadeadam
1747. Newquay Conspicuity
1757. RAF Coningsby Conspicuity
1760-1777 RAF Coningsby
1760-1777 RNAS Yeovilton Fighter Control
2000. Aircraft from non SSR environment or on the aerodrome surface
2001-2077 Transit (ORCAM) Shannon
2100. NATO - CAOC 9 Exercises (activated by NOTAM)
2101-2177 Transit (ORCAM) Amsterdam
2200. NATO - CAOC 9 Exercises (activated by NOTAM)
2201-2277 Superdomestic UK to LF, LE, LP, GC and FA
2300. NATO - CAOC 9 Exercises (activated by NOTAM)
2301-2337 Transit (ORCAM) Bordeaux
2340-2377 Transit (ORCAM) Brest
2400-2477 NATO - CAOC 9 Exercises (activated by NOTAM)
2500. NATO - CAOC 9 Exercises (activated by NOTAM)
2501-2577 Transit (ORCAM) Karlsruhe
2600. NATO - CAOC 9 Exercises (activated by NOTAM)
2601-2620 Aberdeen Approach
2601-2637 RAF Cranwell
2601-2645 MoD Boscombe Down
2601-2657 Irish Domestic Westbound departures and Eastbound arrivals
2621-2630 Aberdeen (Sumburgh Approach)
2631-2637 Aberdeen (Northern North Sea Off-shore)
2640-2657 Aberdeen (Northern North Sea Off-shore - Sumburgh Sector)
2641-2642 RAF Cranwell - Lincolnshire AIAA
2646-2647 MoD Boscombe Down - High Risks Trial
2650. MoD Boscombe Down Conspicuity
2650-2653 Leeds Bradford Approach
2651-2657 MoD Boscombe Down
2654. Leeds Bradford Conspicuity
2655-2677 Leeds Bradford Approach
2660-2675 Middle Wallop
2660-2677 Aberdeen (Northern North Sea Off-shore)
2676-2677 Middle Wallop Conspicuity
2700. NATO - CAOC 9 Exercises (activated by NOTAM)
2701-2737 Transit (ORCAM) Shannon
2740-2777 Transit (ORCAM) Zurich
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
3201-3202 UK Domestic (London TC (Swanwick) Special Sector Codes) 
3203-3216 UK Domestic (London AC (Swanwick) Special Sector Codes) 
3217-3220 UK Domestic
3221-3257 Superdomestic - UK to Oceanic via Shannon/Dublin
3260-3277 UK Domestic
3300. NATO - Aircraft receiving a service from AEW aircraft
3301-3304 Swanwick (Military) Special Tasks
3305-3307 London D&D Cell
3310-3367 Swanwick (Military)
3370-3377 UK Domestic
3400. NATO - Aircraft receiving a service from AEW aircraft
3401-3457 Superdomestic - UK to Germany, Netherlands and Benelux
3460-3477 Transit (ORCAM) Germany to UK
3500. NATO - Aircraft receiving a service from AEW aircraft
3501-3507 Transit (ORCAM) Luxembourg
3510-3537 Transit (ORCAM) Maastricht
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
3601-3644 Cardiff Approach
3601-3647 Jersey Approach
3624. RAF Benson Conspicuity
3640-3645 RAF Odiham
3640-3665 RAF Marham
3640-3677 Aberdeen (Northern North Sea Off-shore)
3641-3677 BAe Warton
3645. Cardiff Approach - St Athan Conspicuity
3646. RAF Odiham Conspicuity
3646-3657 Cardiff Approach
3647-3653 RAF Odiham 
3660-3677 Solent Approach (Southampton)
3666. Solent Radar Conspicuity
3666. RAF Marham - Visual Recovery
3667. RAF Marham - FIS Conspicuity
3667-3677 Solent Approach (Southampton)
3700. NATO - Aircraft receiving a service from AEW aircraft
3701-3710 Norwich Approach
3701-3710 BAe Woodford
3701-3717 Military aircraft under service from RN AEW aircraft in South West Approaches
3701-3736 RAF Brize Norton
3701-3747 Guernsey Approach
3701-3747 RAF Lossiemouth
3711. Woodford Entry/Exit Lane (Woodford Inbounds and Outbounds)
3712. Woodford Entry/Exit Lane (Manchester Inbounds)
3713. Manchester VFR/SVFR (Outbounds)
3720. RAF Cottesmore Conspicuity
3720-3727 RAF Valley
3720-3766 Newcastle Approach
3721-3754 RAF Cottesmore
3730-3736 RAF Valley
3737. RAF Valley - Visual Recovery 
3737. RAF Brize Norton Approach Conspicuity
3740-3745 RAF Brize Norton
3740-3747 RAF Valley
3750. RAF Valley - VFR VATA East
3750-3763 Gatwick Approach (TC)
3751. RAF Valley - VFR VATA West
3752. RAF Valley - RIFA
3753. RAF Valley - Low Level Helicopters
3754. RAF Valley - Special Tasks
3755. RAF Valley
3755-3762 RAF Wittering Approach
3756-3765 RAF Valley - VATA IFR Traffic
3764-3767 Gatwick Tower
3767. Redhill Approach Conspicuity
3767. Newcastle Approach Conspicuity
3770-3777 ATSOCAS
4000. NATO - Aircraft receiving a service from AEW aircraft
4001-4077 Transit (ORCAM) Aix-en-Provence
4100. NATO - Aircraft receiving a service from AEW aircraft
4101-4127 Transit (ORCAM) Frankfurt
4130-4177 Transit (ORCAM) Dusseldorf
4200. NATO - Aircraft receiving a service from AEW aircraft
4201-4214 Heathrow Domestic
4215-4247 Superdomestic - Shannon inbound UK
4250. Manston Conspicuity
4250-4257 Belfast City Approach
4250-4267 Aberdeen Approach
4250-4277 BAe Bristol Filton
4250-4277 Humberside Approach
4251-4267 Manston Approach
4300. NATO - Aircraft receiving a service from AEW aircraft
4301-4307 UK Domestic
4310-4323 UK Domestic (Gatwick Special Sector Codes)
4324-4337 UK Domestic (Scottish Special Sector Codes)
4340-4353 UK Domestic (SCoACC Special Sector Codes)
4354-4377 UK Domestic
4400. NATO - Aircraft receiving a service from AEW aircraft
4401-4427 Superdomestic - Brussels FIR to UK FIR
4430-4477 Superdomestic - UK to Eire and Oceanic
4500. NATO - Aircraft receiving a service from AEW aircraft
4501. Wattisham Conspicuity
4501-4515 RAF Lyneham
4501-4520 Prestwick Approach
4501-4547 RAF Linton-on-Ouse
4502-4547 Wattisham Approach
4516-4517 RAF Lyneham Conspicuity
4520-4524 RAF Lyneham
4530-4542 MoD Aberporth
4530-4567 Plymouth (Military) Radar
4550-4567 Isle of Man
4550-4572 East Midlands Approach
4573. East Midlands Approach Conspicuity
4574. Not allocated
4575. RAF Leeming/RAF Linton-on-Ouse 
4575. Southend Airport Conspicuity
4576-4577 RAF Colerne Conspicuity
4576-4577 Vale of York AIAA Conspicuity
4600. NATO - Aircraft receiving a service from AEW aircraft
4601. Hawarden Conspicuity
4601. RAF Wyton QGH Approach
4602-4607 Hawarden Approach
4610-4667 Scottish (Military) Radar 
4670-4676 TC Stansted/TC Luton
4670-4677 RAF Coningsby RWS
4677. Carlisle Airport Conspicuity
4677. Luton Airport Tower Conspicuity
4700. NATO - Aircraft receiving a service from AEW aircraft
4701-4777 Special Events (activated by NOTAM)
5000. NATO - Aircraft receiving a service from AEW aircraft
5001-5012 TC Non-Standard Flights
5013-5017 UK Domestic
5020-5046 Farnborough LLARS
5047. Farnborough LLARS Conspicuity
5050-5067 Bristol Approach
5070. Bristol VFR Conspicuity
5071-5077 Bristol Approach
5100. NATO - Aircraft receiving a service from AEW aircraft
5101-5177 CRC Boulmer
5200. NATO - Aircraft receiving a service from AEW aircraft
5201-5260 Transit (ORCAM) UK
5261-5270 Transit (ORCAM) Dublin to Europe
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 UK Domestic
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
5660-5677 Transit (ORCAM) Reims
5700. NATO - Aircraft receiving a service from AEW aircraft
5701-5777 Transit (ORCAM) Geneva
6000. NATO - CAOC 9 Exercises 
6001-6007 UK Domestic
6010-6037 UK Domestic
6040-6077 London (Military) Radar
6100. NATO - CAOC 9 Exercises
6101-6107 London (Military) Radar
6110-6137 Scottish (Military) Radar
6140-6147 London (Military) Radar
6151-6157 Scottish (Military) Radar
6160. Doncaster Sheffield Conspicuity
6160-6176 Cambridge Approach
6160-6176 Inverness 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
6171-6177 Doncaster Sheffield Approach
6177. Cambridge Conspicuity
6177. Inverness VFR Conspicuity
6200. NATO - CAOC 9 Exercises 
6201-6227 Superdomestic - Dublin inbound UK
6230-6247 Superdomestic - UK to Scandinavia and Russia
6250-6257 Superdomestic - UK to Amsterdam
6260-6277 Superdomestic - Amsterdam to UK, Eire and Iceland
6300. NATO - CAOC 9 Exercises 
6301-6377 Superdomestic - UK to France
6400. NATO - CAOC 9 Exercises
6401-6457 Swanwick (Military) Radar
6460-6477 UK Domestic
6500. NATO - CAOC 9 Exercises 
6501-6577 CRC Scampton
6600. NATO - CAOC 9 Exercises
6601-6677 Transit (ORCAM) Germany
6700. NATO - CAOC 9 Exercises
6701-6747 Transit (ORCAM) Reims
6750-6777 Transit (ORCAM) Aix-en-Provence
7000. General Conspicuity code
7001. Military Fixed-wing Low Level Conspicuity/Climbout
7002. Danger Areas General
7003. Red Arrows Transit/Display
7004. Conspicuity Aerobatics and Display
7005. High-Energy Manoeuvres
7006. Autonomous Operations within TRA and TRA (G)
7007. Open Skies Observation Aircraft
7010. Operating in Aerodrome Traffic Pattern
7011-7013 Not allocated
7014-7027 UK Domestic
7030-7045 RNAS Culdrose
7030-7046 TC Thames/TC Heathrow
7030-7047 Aldergrove Approach
7030-7066 Durham Tees Valley Airport
7030-7077 Aberdeen (Northern North Sea Off-shore)
7046-7047 RNAS Culdrose Conspicuity
7047. TC Thames (Biggin Hill Airport Conspicuity)
7050-7056 TC Thames/TC Heathrow
7057. TC Thames (London City Airport Conspicuity)
7050-7077 RNAS Culdrose
7067. Durham Tees Valley Airport Conspicuity
7070-7076 TC Thames/TC Heathrow
7077. TC Thames (London Heliport Conspicuity)
7100. London Control (Swanwick) Saturation Code
7101-7177 Transit (ORCAM) Brussels
7200. RN Ships
7201-7247 Transit (ORCAM) Vienna
7250-7257 UK Superdomestic for destinations in France and Barcelona FIR
7260-7267 Superdomestic - Shannon/Dublin to France and Spain
7270-7277 Plymouth Radar Superdomestic for destinations in UK and France
7300. Not allocated
7301-7307 Superdomestic - Shannon Eastbound landing UK
7310-7327 Superdomestic - UK to Netherlands
7330-7347 Superdomestic - Netherlands to UK
7350. Norwich Approach Conspicuity
7350-7361 MoD Ops in EG D701 (Hebrides)
7350-7365 Manchester Approach
7350-7367 RNAS Culdrose
7350-7376 Bournemouth Approach/LARS
7351-7377 Norwich Approach
7362. MoD Ops in EG D702 (Fort George)
7363. MoD Ops in EG D703 (Tain)
7367-7373 Manchester Approach
7374. Dundee Airport Conspicuity
7375. Manchester TMA and Woodvale Local Area (Woodvale UAS Conspicuity)
7377. Bournemouth Radar Conspicuity
7400. MPA/DEFRA/Fishery Protection Conspicuity
7401-7437 UK Domestic
7440-7477 Superdomestic Spain and France to UK, Ireland, Iceland and North America
7500. Special Purpose Code - Hi-Jacking
7501-7537 Transit (ORCAM) Geneva
7540-7547 Transit (ORCAM) Bremen
7550-7577 Transit (ORCAM) Paris
7600. Special Purpose Code - Radio Failure
7601-7607 Superdomestic - Shannon/Dublin to Nordic States
7610-7617 Superdomestic - Ireland to UK
7620-7657 Superdomestic - UK to USA, Canada and Caribbean
7660-7677 Superdomestic - UK to USA, Canada, Canaries and Caribbean
7700. Special Purpose Code - Emergency
7701-7717 Superdomestic - UK to France and Spain
7720-7727 Transit (ORCAM) Munich
7730-7757 Superdomestic - Shannon Eastbound landing UK
7760-7775 Superdomestic - UK to Channel Islands
7776-7777 SSR Monitors

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