Apparatus

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sensors Mode-S transponder

408040

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-TUKX · BOEING 737-800

Hex
408040
Octal
20100100
Decimal
4,227,136
Country
GB
Tail
G-TUKX
Type
B738
Broadcasting now · callsign TOM2XK · 35,000 ft
Flights observed
267
Distinct callsigns
20
Country
GB
Last broadcast
14d ago

Current position

408040 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 408040 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
TOM8CG TUI Airways 7 2026-07-23
TOM1BK TUI Airways 7 2026-07-23
TOM8JY - 6 2026-07-23
TOM55B TUI Airways 6 2026-07-23
TOM92Y TUI Airways 5 2026-07-17
TOM7VG - 5 2026-07-20
TOM5MB TUI Airways 5 2026-07-21
TOM56H - 5 2026-07-15
TOM4XH - 5 2026-07-15
TOM4DB TUI Airways 5 2026-07-20
TOM17B TUI Airways 5 2026-07-17
TOM14Y TUI Airways 5 2026-07-21
TOM9GE TUI Airways 4 2026-07-24
TOM9EM TUI Airways 4 2026-07-24
TOM8AX TUI Airways 4 2026-07-26
TOM7VK - 4 2026-07-17
TOM6JY - 4 2026-07-14
TOM6GN TUI Airways 4 2026-07-25
TOM603 TUI Airways 4 2026-06-24
TOM47C TUI Airways 4 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 TOM5YM GLA → ZTH Jul 26, 16:30 UTCJul 26, 20:30 UTC4h 0m
2026-07-26 TOM8AX EXT → ZTH Jul 26, 10:30 UTCJul 26, 14:10 UTC3h 40m
2026-07-26 TOM3EN BHX → DLM Jul 26, 06:20 UTCJul 26, 09:15 UTC2h 56m
2026-07-25 TOM2NH PMI → MAN Jul 25, 18:00 UTCJul 25, 20:25 UTC2h 25m
2026-07-25 TOM7BD IBZ → LGW Jul 25, 14:10 UTCJul 25, 16:20 UTC2h 10m
2026-07-25 TOM6GN LGW → AGA Jul 25, 09:55 UTCJul 25, 12:20 UTC2h 25m
2026-07-25 TOM47C MAN → PMI Jul 25, 05:55 UTCJul 25, 08:15 UTC2h 20m
2026-07-24 TOM1MB MAN → AYT Jul 24, 18:50 UTCJul 24, 21:55 UTC3h 5m
2026-07-24 TOM9GE MAH → STN Jul 24, 14:40 UTCJul 24, 17:05 UTC2h 25m
2026-07-24 TOM3VG LGW → RAK Jul 24, 10:20 UTCJul 24, 13:30 UTC3h 10m
2026-07-24 TOM9EM LGW → FUE Jul 24, 05:35 UTCJul 24, 08:05 UTC2h 30m
2026-07-23 TOM55B BRS → REU Jul 23, 21:25 UTCJul 24, 00:25 UTC3h 0m
2026-07-23 TOM8JY - Jul 23, 16:55 UTCJul 23, 19:30 UTC2h 35m
2026-07-23 TOM1BK CFU → NCL Jul 23, 11:40 UTCJul 23, 14:55 UTC3h 15m
2026-07-23 TOM8CG BHX → PMI Jul 23, 06:40 UTCJul 23, 09:15 UTC2h 35m
2026-07-22 TOM67B - Jul 22, 10:20 UTCJul 22, 12:05 UTC1h 45m
2026-07-21 TOM4DT CFU → LBA Jul 21, 19:05 UTCJul 21, 22:40 UTC3h 35m
2026-07-21 TOM6LA - Jul 21, 14:50 UTCJul 21, 17:50 UTC3h 0m
2026-07-21 TOM14Y IBZ → MAN Jul 21, 10:50 UTCJul 21, 13:10 UTC2h 20m
2026-07-21 TOM5MB MAN → ADB Jul 21, 06:45 UTCJul 21, 09:05 UTC2h 20m
2026-07-20 TOM27G IBZ → EMA Jul 20, 20:05 UTCJul 20, 22:20 UTC2h 15m
2026-07-20 TOM1FX LGW → FAO Jul 20, 16:15 UTCJul 20, 18:35 UTC2h 20m
2026-07-20 TOM7VG SKG → MAN Jul 20, 10:20 UTCJul 20, 13:35 UTC3h 15m
2026-07-20 TOM4DB LGW → RHO Jul 20, 06:00 UTCJul 20, 09:00 UTC3h 0m
2026-07-19 TOM58N MAN → SID Jul 19, 20:55 UTCJul 20, 01:00 UTC4h 5m
2026-07-19 TOM8ET MAN → KGS Jul 19, 16:05 UTCJul 19, 19:40 UTC3h 35m
2026-07-19 TOM8AX EXT → ZTH Jul 19, 10:40 UTCJul 19, 14:25 UTC3h 45m
2026-07-19 TOM3EN BHX → DLM Jul 19, 06:20 UTCJul 19, 09:20 UTC3h 0m
2026-07-18 TOM2NH PMI → MAN Jul 18, 19:25 UTCJul 18, 21:55 UTC2h 30m
2026-07-18 TOM7BD - Jul 18, 15:15 UTCJul 18, 17:45 UTC2h 30m
2026-07-18 TOM6GN - Jul 18, 11:10 UTCJul 18, 13:30 UTC2h 20m
2026-07-18 TOM47C MAN → PMI Jul 18, 06:20 UTCJul 18, 08:40 UTC2h 20m
2026-07-17 TOM2TC MAN → KAO Jul 17, 21:05 UTCJul 18, 01:15 UTC4h 10m
2026-07-17 TOM7VK MAN → RHO Jul 17, 15:44 UTCJul 17, 19:35 UTC3h 50m
2026-07-17 TOM17B LGW → FUE Jul 17, 09:45 UTCJul 17, 12:10 UTC2h 25m
2026-07-17 TOM92Y LGW → DLM Jul 17, 06:05 UTCJul 17, 08:10 UTC2h 5m
2026-07-16 TOM55B BRS → REU Jul 16, 21:40 UTCJul 17, 01:00 UTC3h 20m
2026-07-16 TOM8JY - Jul 16, 16:55 UTCJul 16, 19:40 UTC2h 45m
2026-07-16 TOM1BK - Jul 16, 11:05 UTCJul 16, 14:15 UTC3h 10m
2026-07-16 TOM8CG - Jul 16, 06:30 UTCJul 16, 09:05 UTC2h 35m
2026-07-15 TOM2TG - Jul 15, 20:00 UTCJul 15, 23:00 UTC3h 0m
2026-07-15 TOM4XH - Jul 15, 15:40 UTCJul 15, 17:40 UTC2h 0m
2026-07-15 TOM4XH - Jul 15, 15:05 UTCJul 15, 15:35 UTC30m
2026-07-15 TOM56H - Jul 15, 09:55 UTCJul 15, 13:10 UTC3h 15m
2026-07-15 TOM1TB - Jul 15, 05:45 UTCJul 15, 08:20 UTC2h 35m
2026-07-14 TOM17E - Jul 14, 20:40 UTCJul 15, 01:20 UTC4h 39m
2026-07-14 TOM6JY MAN → PFO Jul 14, 14:50 UTCJul 14, 19:00 UTC4h 10m
2026-07-14 TOM3KW - Jul 14, 10:50 UTCJul 14, 13:00 UTC2h 10m
2026-07-14 TOM1CX - Jul 14, 07:00 UTCJul 14, 09:20 UTC2h 20m
2026-07-13 TOM27G - Jul 13, 20:10 UTCJul 13, 22:20 UTC2h 10m

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

Mode-S 408040 frequently asked

What is Mode-S code 408040?
408040 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-TUKX.
Where is Mode-S 408040 registered?
Mode-S code 408040 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 408040 broadcasting right now?
Yes. Mode-S 408040 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 408040, octal 20100100, decimal 4,227,136.
What flights does 408040 operate?
Mode-S 408040 has broadcast 20 distinct callsigns, including TOM8CG, TOM1BK, TOM8JY, TOM55B, TOM92Y.