Apparatus

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sensors Mode-S transponder

40803F

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-TUKW · BOEING 737-800

Hex
40803F
Octal
20100077
Decimal
4,227,135
Country
GB
Tail
G-TUKW
Type
B738
Broadcasting now · callsign TOM45M · 37,000 ft
Flights observed
289
Distinct callsigns
20
Country
GB
Last broadcast
Jul 26, 21:45 UTC

Current position

40803F is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 40803F 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
TOM2XM TUI Airways 8 2026-07-20
TOM4KW - 7 2026-07-20
TOM9TE - 5 2026-07-20
TOM8PG TUI Airways 5 2026-04-28
TOM7XM TUI Airways 5 2026-04-30
TOM5PH - 5 2026-04-30
TOM2BC TUI Airways 5 2026-04-27
TOM9NB TUI Airways 4 2026-07-24
TOM8JN TUI Airways 4 2026-04-24
TOM67A - 4 2026-07-13
TOM66L TUI Airways 4 2026-07-24
TOM519 TUI Airways 4 2026-07-25
TOM518 - 4 2026-07-04
TOM2EW TUI Airways 4 2026-04-28
TOM9AJ - 3 2026-06-25
TOM8YE TUI Airways 3 2026-07-10
TOM8EX - 3 2026-06-25
TOM79C TUI Airways 3 2026-07-24
TOM6VA - 3 2026-07-10
TOM57D TUI Airways 3 2026-04-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 TOM8EL GLA → GLA Jul 26, 20:35 UTCJul 26, 21:45 UTC1h 10m
2026-07-26 TOM1BJ MAN → AGP Jul 26, 14:15 UTCJul 26, 19:05 UTC4h 50m
2026-07-26 TOM6BY EMA → NBE Jul 26, 09:00 UTCJul 26, 12:50 UTC3h 50m
2026-07-25 TOM20J FUE → LGW Jul 25, 14:45 UTCJul 25, 23:15 UTC8h 30m
2026-07-25 TOM519 DLM → LGW Jul 25, 06:05 UTCJul 25, 12:35 UTC6h 30m
2026-07-24 TOM4CK LGW → ACE Jul 24, 19:55 UTCJul 24, 23:50 UTC3h 55m
2026-07-24 TOM79C EMA → DBV Jul 24, 15:10 UTCJul 24, 18:35 UTC3h 25m
2026-07-24 TOM9NB NBE → BHX Jul 24, 10:40 UTCJul 24, 13:30 UTC2h 50m
2026-07-24 TOM66L SID → MAN Jul 24, 06:00 UTCJul 24, 08:20 UTC2h 20m
2026-07-23 TOM58W MAH → MAN Jul 23, 19:25 UTCJul 23, 22:50 UTC3h 25m
2026-07-23 TOM56J - Jul 23, 14:10 UTCJul 23, 18:00 UTC3h 50m
2026-07-23 TOM6LJ - Jul 23, 10:25 UTCJul 23, 12:35 UTC2h 10m
2026-07-23 TOM4TH TRN → GLA Jul 23, 07:00 UTCJul 23, 08:45 UTC1h 45m
2026-07-22 TOM2VN EXT → ACE Jul 22, 20:20 UTCJul 22, 22:35 UTC2h 15m
2026-07-22 TOM7ET LGW → MAH Jul 22, 17:05 UTCJul 22, 18:55 UTC1h 50m
2026-07-22 TOM4HJ - Jul 22, 10:25 UTCJul 22, 15:45 UTC5h 20m
2026-07-21 TOM627 DLM → LGW Jul 21, 22:25 UTCJul 22, 02:30 UTC4h 5m
2026-07-21 TOM626 LGW → DLM Jul 21, 17:20 UTCJul 21, 20:45 UTC3h 25m
2026-07-21 TOM1WT LGW → KAO Jul 21, 11:55 UTCJul 21, 15:40 UTC3h 45m
2026-07-21 TOM2EM TFS → LGW Jul 21, 07:10 UTCJul 21, 10:15 UTC3h 5m
2026-07-20 TOM9TE LGW → LGW Jul 20, 15:20 UTCJul 20, 23:40 UTC8h 20m
2026-07-20 TOM4KW SKG → LGW Jul 20, 09:55 UTCJul 20, 13:15 UTC3h 20m
2026-07-20 TOM2XM TFS → GLA Jul 20, 05:55 UTCJul 20, 08:30 UTC2h 35m
2026-07-19 TOM1GJ LGW → AYT Jul 19, 17:20 UTCJul 19, 20:40 UTC3h 20m
2026-07-19 TOM2JG - Jul 19, 14:35 UTCJul 19, 16:10 UTC1h 35m
2026-07-19 TOM2JG - Jul 19, 13:25 UTCJul 19, 14:30 UTC1h 5m
2026-07-18 TOM9JB SKG → NCL Jul 18, 19:15 UTCJul 18, 23:10 UTC3h 55m
2026-07-18 TOM596 LGW → DLM Jul 18, 13:45 UTCJul 18, 17:00 UTC3h 15m
2026-07-18 TOM5GD HRG → MAN Jul 18, 08:40 UTCJul 18, 10:30 UTC1h 50m
2026-07-18 TOM3TB NCL → PMI Jul 18, 05:30 UTCJul 18, 07:10 UTC1h 40m
2026-07-17 TOM4CK LGW → ACE Jul 17, 21:25 UTCJul 18, 01:20 UTC3h 55m
2026-07-17 TOM79C EMA → DBV Jul 17, 16:34 UTCJul 17, 20:10 UTC3h 35m
2026-07-17 TOM9NB - Jul 17, 11:50 UTCJul 17, 14:44 UTC2h 55m
2026-07-17 TOM66L SID → MAN Jul 17, 06:35 UTCJul 17, 08:54 UTC2h 20m
2026-07-16 TOM39G MAN → MAN Jul 16, 22:05 UTCJul 17, 01:59 UTC3h 55m
2026-07-16 TOM4LX LGW → KGS Jul 16, 17:35 UTCJul 16, 20:55 UTC3h 20m
2026-07-16 TOM4MD - Jul 16, 13:05 UTCJul 16, 16:00 UTC2h 55m
2026-07-16 TOM4XJ - Jul 16, 09:00 UTCJul 16, 11:20 UTC2h 20m
2026-07-15 TOM5365 RHO → LGW Jul 15, 19:30 UTCJul 15, 23:35 UTC4h 5m
2026-07-15 TOM5364 LGW → RHO Jul 15, 14:40 UTCJul 15, 18:00 UTC3h 20m
2026-07-15 TOM2YT - Jul 15, 10:35 UTCJul 15, 12:35 UTC2h 0m
2026-07-15 TOM4BD LGW → OLB Jul 15, 07:00 UTCJul 15, 08:55 UTC1h 55m
2026-07-14 TOM7CX - Jul 14, 11:50 UTCJul 14, 15:30 UTC3h 40m
2026-07-14 TOM8DJ - Jul 14, 06:20 UTCJul 14, 09:35 UTC3h 15m
2026-07-13 TOM67A - Jul 13, 20:50 UTCJul 13, 23:55 UTC3h 5m
2026-07-13 TOM9TE - Jul 13, 15:20 UTCJul 13, 18:55 UTC3h 35m
2026-07-13 TOM4KW - Jul 13, 10:00 UTCJul 13, 13:20 UTC3h 20m
2026-07-13 TOM2XM - Jul 13, 06:35 UTCJul 13, 08:15 UTC1h 40m
2026-07-13 TOM2XM - Jul 13, 05:31 UTCJul 13, 06:30 UTC1h 0m
2026-07-12 TOM9GX - Jul 12, 18:25 UTCJul 12, 20:15 UTC1h 50m

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-TUKW page for operator, model, and routing details .

Mode-S 40803F frequently asked

What is Mode-S code 40803F?
40803F is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-TUKW.
Where is Mode-S 40803F registered?
Mode-S code 40803F 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 40803F broadcasting right now?
Yes. Mode-S 40803F is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 40803F, octal 20100077, decimal 4,227,135.
What flights does 40803F operate?
Mode-S 40803F has broadcast 20 distinct callsigns, including TOM2XM, TOM4KW, TOM9TE, TOM8PG, TOM7XM.