Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

406CAA

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-GDFU · BOEING 737-800

Hex
406CAA
Octal
20066252
Decimal
4,222,122
Country
GB
Tail
G-GDFU
Type
B738
Broadcasting now · callsign EXS44QA · 35,350 ft
Flights observed
415
Distinct callsigns
20
Country
GB
Last broadcast
Jul 26, 22:30 UTC

Current position

406CAA is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 406CAA falls within the block assigned to United Kingdom (GB) by ICAO Annex 10, Volume III. Every aircraft registered in United Kingdom receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 20 distinct

Callsign Airline Flights Last seen
EXS44QA - 6 2026-04-16
EXS26VG - 5 2026-07-10
EXS85RL - 4 2026-07-07
EXS82PX Jet2.com 4 2026-04-21
EXS7RH - 4 2026-06-28
EXS5TR - 4 2026-06-18
EXS59ED - 4 2026-06-18
EXS4NJ Jet2.com 4 2026-04-17
EXS43TL Jet2.com 4 2026-04-21
EXS3XZ Jet2.com 4 2026-04-21
EXS31NH - 4 2026-07-07
EXS1TL - 4 2026-07-07
EXS9WG - 3 2026-05-02
EXS89MV Jet2.com 3 2026-04-16
EXS82EA Jet2.com 3 2026-04-15
EXS72RV Jet2.com 3 2026-05-02
EXS72BQ Jet2.com 3 2026-04-21
EXS63WQ - 3 2026-07-18
EXS5M Jet2.com 3 2026-06-28
EXS56AM Jet2.com 3 2026-05-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 EXS58K NCL → LCA Jul 26, 20:25 UTCJul 26, 22:30 UTC2h 5m
2026-07-26 EXS28Q LCA → NCL Jul 26, 16:05 UTCJul 26, 18:40 UTC2h 35m
2026-07-26 EXS46QW MAH → STN Jul 26, 10:10 UTCJul 26, 14:05 UTC3h 55m
2026-07-26 EXS45FL BJV → STN Jul 26, 05:20 UTCJul 26, 08:35 UTC3h 16m
2026-07-25 EXS6MN STN → JSI Jul 25, 21:55 UTCJul 26, 02:20 UTC4h 25m
2026-07-25 EXS61B STN → CHQ Jul 25, 16:50 UTCJul 25, 20:40 UTC3h 50m
2026-07-25 EXS17YP TFS → MAN Jul 25, 12:55 UTCJul 25, 15:20 UTC2h 25m
2026-07-25 EXS91KB MAN → TFS Jul 25, 08:10 UTCJul 25, 10:45 UTC2h 35m
2026-07-24 EXS9P STN → TIV Jul 24, 20:20 UTCJul 25, 00:05 UTC3h 45m
2026-07-24 EXS29JB STN → ADB Jul 24, 16:10 UTCJul 24, 19:10 UTC3h 0m
2026-07-24 EXS94PK BHX → JER Jul 24, 10:50 UTCJul 24, 14:50 UTC4h 0m
2026-07-24 EXS35RA BHX → EFL Jul 24, 05:40 UTCJul 24, 09:00 UTC3h 20m
2026-07-23 EXS14VP BRS → PMI Jul 23, 22:20 UTCJul 24, 02:00 UTC3h 40m
2026-07-23 EXS7FS ZTH → BRS Jul 23, 17:40 UTCJul 23, 20:45 UTC3h 5m
2026-07-23 EXS41KC RHO → STN Jul 23, 11:45 UTCJul 23, 15:00 UTC3h 15m
2026-07-23 EXS79ET TFS → STN Jul 23, 07:40 UTCJul 23, 10:20 UTC2h 40m
2026-07-22 EXS36UM PMI → STN Jul 22, 21:15 UTCJul 23, 02:00 UTC4h 45m
2026-07-22 EXS35FC HER → STN Jul 22, 15:40 UTCJul 22, 19:40 UTC4h 0m
2026-07-22 EXS29KR TFS → STN Jul 22, 10:20 UTCJul 22, 13:50 UTC3h 30m
2026-07-21 EXS66UN MAN → OLB Jul 21, 17:10 UTCJul 21, 19:45 UTC2h 35m
2026-07-21 EXS77TB STN → STN Jul 21, 13:40 UTCJul 21, 16:05 UTC2h 25m
2026-07-21 EXS1418 SPU → STN Jul 21, 10:15 UTCJul 21, 12:30 UTC2h 15m
2026-07-21 EXS81TB BRS → ACE Jul 21, 06:45 UTCJul 21, 08:35 UTC1h 50m
2026-07-20 EXS14JP HER → STN Jul 20, 20:55 UTCJul 21, 00:50 UTC3h 55m
2026-07-20 EXS3NX PVK → BRS Jul 20, 16:00 UTCJul 20, 19:25 UTC3h 25m
2026-07-20 EXS47SR NCL → SZG Jul 20, 11:05 UTCJul 20, 14:00 UTC2h 55m
2026-07-20 EXS3KC LPA → STN Jul 20, 06:30 UTCJul 20, 09:30 UTC3h 0m
2026-07-19 EXS8VB BRS → JTR Jul 19, 18:50 UTCJul 19, 21:45 UTC2h 55m
2026-07-19 EXS19WU TIV → STN Jul 19, 14:45 UTCJul 19, 17:15 UTC2h 30m
2026-07-19 EXS84NE STN → CMF Jul 19, 09:25 UTCJul 19, 12:35 UTC3h 10m
2026-07-19 EXS83JH STN → STN Jul 19, 05:15 UTCJul 19, 08:15 UTC3h 0m
2026-07-18 EXS68PV - Jul 18, 23:10 UTCJul 19, 01:10 UTC2h 0m
2026-07-18 EXS45YK PMI → BFS Jul 18, 19:30 UTCJul 18, 21:25 UTC1h 55m
2026-07-18 EXS94LD - Jul 18, 16:05 UTCJul 18, 18:15 UTC2h 10m
2026-07-18 EXS69MQ - Jul 18, 12:20 UTCJul 18, 14:15 UTC1h 55m
2026-07-18 EXS2TB STN → SKG Jul 18, 08:35 UTCJul 18, 10:40 UTC2h 5m
2026-07-18 EXS63WQ - Jul 18, 05:05 UTCJul 18, 07:15 UTC2h 10m
2026-07-17 EXS46QW MAH → STN Jul 17, 20:20 UTCJul 18, 00:10 UTC3h 50m
2026-07-17 EXS45FL - Jul 17, 15:40 UTCJul 17, 18:55 UTC3h 15m
2026-07-17 EXS2TB STN → SKG Jul 17, 11:04 UTCJul 17, 13:15 UTC2h 10m
2026-07-17 EXS63WQ - Jul 17, 07:05 UTCJul 17, 09:10 UTC2h 5m
2026-07-16 EXS57HY - Jul 16, 19:30 UTCJul 16, 22:55 UTC3h 25m
2026-07-16 EXS14QZ - Jul 16, 14:05 UTCJul 16, 17:35 UTC3h 30m
2026-07-16 EXS66KE IBZ → STN Jul 16, 08:50 UTCJul 16, 11:05 UTC2h 15m
2026-07-16 EXS31DR - Jul 16, 05:15 UTCJul 16, 07:35 UTC2h 20m
2026-07-15 EXS473Q - Jul 15, 21:00 UTCJul 16, 01:05 UTC4h 5m
2026-07-15 EXS53NZ - Jul 15, 15:50 UTCJul 15, 19:30 UTC3h 40m
2026-07-15 EXS2TB - Jul 15, 11:15 UTCJul 15, 13:20 UTC2h 5m
2026-07-15 EXS63WQ - Jul 15, 07:35 UTCJul 15, 09:45 UTC2h 10m
2026-07-14 EXS406R - Jul 14, 19:45 UTCJul 14, 22:00 UTC2h 15m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the G-GDFU page for operator, model, and routing details .

Mode-S 406CAA frequently asked

What is Mode-S code 406CAA?
406CAA is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-GDFU.
Where is Mode-S 406CAA registered?
Mode-S code 406CAA is allocated to United Kingdom (GB). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 406CAA broadcasting right now?
Yes. Mode-S 406CAA is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 406CAA, octal 20066252, decimal 4,222,122.
What flights does 406CAA operate?
Mode-S 406CAA has broadcast 20 distinct callsigns, including EXS44QA, EXS26VG, EXS85RL, EXS82PX, EXS7RH.