Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

4079A9

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-TUKF · BOEING 737-800

Hex
4079A9
Octal
20074651
Decimal
4,225,449
Country
GB
Tail
G-TUKF
Type
B738
Transponder active on ground
Flights observed
110
Distinct callsigns
20
Country
GB
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 4079A9.

Country allocation

The ICAO 24-bit address 4079A9 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
TOM9NK - 4 2026-06-11
TOM8DE - 4 2026-06-11
TOM82J - 4 2026-06-13
TOM7BJ TUI Airways 4 2026-06-12
TOM6GK TUI Airways 4 2026-06-13
TOM6FA TUI Airways 4 2026-06-10
TOM5HT TUI Airways 4 2026-06-10
TOM4CX TUI Airways 4 2026-06-12
TOM8NM - 3 2026-06-08
TOM6FB - 3 2026-06-11
TOM37E TUI Airways 3 2026-06-08
TOM1VE - 3 2026-06-11
TOM8HN TUI Airways 2 2026-06-07
TOM8GM TUI Airways 2 2026-06-08
TOM89L TUI Airways 2 2026-06-05
TOM61Y - 2 2026-06-06
TOM5DX TUI Airways 2 2026-06-09
TOM509 TUI Airways 2 2026-06-05
TOM4KW - 2 2026-06-15
TOM42D TUI Airways 2 2026-06-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-16 TOM11K BHX → RHO Jun 16, 13:40 UTCJun 16, 17:15 UTC3h 35m
2026-06-16 TOM6MA RHO → BRS Jun 16, 09:40 UTCJun 16, 11:55 UTC2h 15m
2026-06-16 TOM49B MAN → SID Jun 16, 05:45 UTCJun 16, 07:34 UTC1h 50m
2026-06-15 TOM9TE PMI → DUB Jun 15, 15:25 UTCJun 16, 00:00 UTC8h 35m
2026-06-15 TOM4KW SKG → LGW Jun 15, 10:05 UTCJun 15, 13:34 UTC3h 30m
2026-06-15 TOM8YH BRS → SKG Jun 15, 05:15 UTCJun 15, 08:04 UTC2h 50m
2026-06-14 TOM68H MAN → GVA Jun 14, 19:00 UTCJun 14, 23:54 UTC4h 54m
2026-06-14 TOM34G GLA → PMI Jun 14, 13:35 UTCJun 14, 17:30 UTC3h 55m
2026-06-14 TOM6PE BHX → ZTH Jun 14, 09:00 UTCJun 14, 11:05 UTC2h 5m
2026-06-14 TOM9TG PFO → NCL Jun 14, 05:30 UTCJun 14, 07:15 UTC1h 45m
2026-06-13 TOM1NK PFO → LGW Jun 13, 19:05 UTCJun 13, 23:25 UTC4h 20m
2026-06-13 TOM37G LGW → TFS Jun 13, 13:35 UTCJun 13, 17:25 UTC3h 50m
2026-06-13 TOM82J - Jun 13, 10:05 UTCJun 13, 11:55 UTC1h 50m
2026-06-13 TOM6GK LCA → BHX Jun 13, 06:55 UTCJun 13, 08:20 UTC1h 25m
2026-06-12 TOM4503 - Jun 12, 19:20 UTCJun 12, 22:50 UTC3h 30m
2026-06-12 TOM4502 LGW → ACE Jun 12, 14:20 UTCJun 12, 18:05 UTC3h 45m
2026-06-12 TOM4CX CWL → AYT Jun 12, 10:20 UTCJun 12, 12:40 UTC2h 20m
2026-06-12 TOM7BJ LGW → IBZ Jun 12, 07:10 UTCJun 12, 09:05 UTC1h 55m
2026-06-11 TOM6FB - Jun 11, 23:45 UTCJun 12, 04:15 UTC4h 31m
2026-06-11 TOM1VE - Jun 11, 18:40 UTCJun 11, 22:35 UTC3h 55m
2026-06-11 TOM9NK - Jun 11, 13:35 UTCJun 11, 17:00 UTC3h 25m
2026-06-11 TOM8DE LGW → EFL Jun 11, 08:55 UTCJun 11, 12:05 UTC3h 10m
2026-06-10 TOM5HT NCL → RHO Jun 10, 14:05 UTCJun 10, 18:00 UTC3h 55m
2026-06-10 TOM6FA HER → BHX Jun 10, 08:30 UTCJun 10, 12:05 UTC3h 35m
2026-06-09 TOM1GN AYT → LGW Jun 9, 20:25 UTCJun 10, 00:25 UTC4h 0m
2026-06-09 TOM506 LGW → AGA Jun 9, 14:40 UTCJun 9, 18:30 UTC3h 50m
2026-06-09 TOM44L VRN → VRN Jun 9, 09:20 UTCJun 9, 11:30 UTC2h 10m
2026-06-09 TOM5DX EMA → MAH Jun 9, 05:35 UTCJun 9, 07:30 UTC1h 55m
2026-06-08 TOM30W MAN → ACE Jun 8, 18:55 UTCJun 8, 21:05 UTC2h 10m
2026-06-08 TOM8GM LGW → LGW Jun 8, 15:45 UTCJun 8, 17:35 UTC1h 50m
2026-06-08 TOM8NM - Jun 8, 11:25 UTCJun 8, 13:50 UTC2h 25m
2026-06-08 TOM37E LGW → ACE Jun 8, 07:05 UTCJun 8, 09:15 UTC2h 10m
2026-06-07 TOM203 AYT → LGW Jun 7, 23:45 UTCJun 8, 03:40 UTC3h 55m
2026-06-07 TOM202 LGW → AYT Jun 7, 18:25 UTCJun 7, 22:00 UTC3h 35m
2026-06-07 TOM42D PMI → LGW Jun 7, 12:30 UTCJun 7, 16:20 UTC3h 50m
2026-06-07 TOM8HN AYT → LGW Jun 7, 07:05 UTCJun 7, 10:25 UTC3h 20m
2026-06-06 TOM61Y - Jun 6, 19:44 UTCJun 6, 23:24 UTC3h 40m
2026-06-06 TOM38L CFU → EMA Jun 6, 14:20 UTCJun 6, 17:54 UTC3h 35m
2026-06-06 TOM82J - Jun 6, 10:00 UTCJun 6, 11:45 UTC1h 45m
2026-06-06 TOM6GK LCA → BHX Jun 6, 07:00 UTCJun 6, 08:30 UTC1h 30m
2026-06-05 TOM509 AYT → MAN Jun 5, 20:45 UTCJun 6, 00:40 UTC3h 55m
2026-06-05 TOM89L LGW → DLM Jun 5, 15:35 UTCJun 5, 19:05 UTC3h 30m
2026-06-05 TOM4CX CWL → AYT Jun 5, 10:45 UTCJun 5, 13:00 UTC2h 15m
2026-06-05 TOM7BJ LGW → IBZ Jun 5, 07:20 UTCJun 5, 09:25 UTC2h 5m
2026-06-04 TOM9NK - Jun 4, 13:40 UTCJun 4, 16:55 UTC3h 15m
2026-06-04 TOM8DE SZG → STN Jun 4, 09:20 UTCJun 4, 12:15 UTC2h 55m
2026-06-03 TOM5HT NCL → RHO Jun 3, 13:20 UTCJun 3, 17:15 UTC3h 55m
2026-06-03 TOM6FA HER → BHX Jun 3, 08:15 UTCJun 3, 11:45 UTC3h 30m
2026-06-02 TOM7PC PMI → MAN Jun 2, 19:40 UTCJun 2, 23:25 UTC3h 45m
2026-06-02 TOM11K BHX → RHO Jun 2, 14:50 UTCJun 2, 18:25 UTC3h 35m

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

Mode-S 4079A9 frequently asked

What is Mode-S code 4079A9?
4079A9 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-TUKF.
Where is Mode-S 4079A9 registered?
Mode-S code 4079A9 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 4079A9 broadcasting right now?
Mode-S 4079A9 is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4079A9, octal 20074651, decimal 4,225,449.
What flights does 4079A9 operate?
Mode-S 4079A9 has broadcast 20 distinct callsigns, including TOM9NK, TOM8DE, TOM82J, TOM7BJ, TOM6GK.