Apparatus

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sensors Mode-S transponder

4005B9

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-VIIA · BOEING 777-200

Hex
4005B9
Octal
20002671
Decimal
4,195,769
Country
GB
Tail
G-VIIA
Type
B772
No current signal · last broadcast 6h ago
Flights observed
180
Distinct callsigns
20
Country
GB
Last broadcast
6h ago

Last known position

Most recent position reported by Mode-S 4005B9.

Country allocation

The ICAO 24-bit address 4005B9 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
BAW252N - 11 2026-07-12
BAW172 - 11 2026-06-23
BAW7W - 10 2026-06-24
BAW7NY - 10 2026-06-22
BAW255T - 9 2026-07-10
BAW216 - 9 2026-06-24
BAW178 British Airways 8 2026-06-11
BAW183 - 7 2026-07-13
BAW181 British Airways 7 2026-06-21
BAW7CP British Airways 6 2026-06-07
BAW51B - 6 2026-06-13
BAW11J - 6 2026-06-21
BAW9E - 5 2026-06-25
BAW6AC British Airways 5 2026-06-08
BAW53M - 5 2026-07-11
BAW50G British Airways 5 2026-06-12
BAW185 - 5 2026-06-25
BAW82 - 4 2026-06-11
BAW25GP - 4 2026-07-11
BAW23T British Airways 4 2026-05-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 BAW183 - Jul 13, 18:55 UTCJul 14, 01:50 UTC6h 55m
2026-07-12 BAW19N LHR → LHR Jul 12, 13:55 UTCJul 13, 05:45 UTC15h 50m
2026-07-12 BAW252N - Jul 12, 09:10 UTCJul 12, 10:20 UTC1h 10m
2026-07-11 BAW252N - Jul 11, 10:20 UTCJul 12, 10:15 UTC23h 55m
2026-07-11 BAW53M - Jul 11, 09:45 UTCJul 11, 10:40 UTC55m
2026-07-11 BAW25GP - Jul 11, 03:55 UTCJul 11, 05:10 UTC1h 15m
2026-07-10 BAW255T - Jul 10, 18:45 UTCJul 10, 19:00 UTC15m
2026-07-10 BAW255T - Jul 10, 11:00 UTCJul 10, 11:55 UTC55m
2026-07-09 BAW19N - Jul 9, 13:55 UTCJul 10, 05:30 UTC15h 35m
2026-07-09 BAW252N - Jul 9, 08:50 UTCJul 9, 10:15 UTC1h 25m
2026-07-08 BAW252N - Jul 8, 10:20 UTCJul 9, 10:15 UTC23h 55m
2026-07-08 BAW25GP - Jul 8, 04:00 UTCJul 8, 05:10 UTC1h 10m
2026-07-07 BAW255T - Jul 7, 18:20 UTCJul 7, 18:35 UTC15m
2026-07-07 BAW255T - Jul 7, 10:50 UTCJul 7, 11:45 UTC55m
2026-07-07 BAW25GP - Jul 7, 02:25 UTCJul 7, 05:50 UTC3h 25m
2026-07-06 BAW255T - Jul 6, 18:45 UTCJul 6, 19:00 UTC15m
2026-07-06 BAW255T - Jul 6, 11:15 UTCJul 6, 12:30 UTC1h 15m
2026-07-06 BAW9156 - Jul 6, 06:15 UTCJul 6, 08:05 UTC1h 50m
2026-07-05 BAW255T - Jul 5, 18:15 UTCJul 5, 18:30 UTC15m
2026-07-05 BAW255T - Jul 5, 10:35 UTCJul 5, 11:30 UTC55m
2026-07-04 BAW18B - Jul 4, 13:45 UTCJul 5, 05:40 UTC15h 55m
2026-07-04 BAW252N - Jul 4, 09:10 UTCJul 4, 10:25 UTC1h 15m
2026-07-03 BAW252N - Jul 3, 10:20 UTCJul 4, 10:15 UTC23h 55m
2026-07-03 BAW53M - Jul 3, 09:50 UTCJul 3, 11:05 UTC1h 15m
2026-07-02 BAW18B - Jul 2, 14:00 UTCJul 3, 05:30 UTC15h 30m
2026-07-02 BAW252N - Jul 2, 09:15 UTCJul 2, 10:30 UTC1h 15m
2026-07-01 BAW252N - Jul 1, 10:20 UTCJul 2, 10:15 UTC23h 55m
2026-07-01 BAW53M - Jul 1, 09:45 UTCJul 1, 10:50 UTC1h 5m
2026-07-01 BAW25GP - Jul 1, 04:25 UTCJul 1, 05:30 UTC1h 5m
2026-06-30 BAW255T - Jun 30, 10:50 UTCJun 30, 11:45 UTC55m
2026-06-29 BAW18B - Jun 29, 13:49 UTCJun 30, 05:40 UTC15h 51m
2026-06-29 BAW252N - Jun 29, 09:00 UTCJun 29, 10:00 UTC1h 0m
2026-06-28 BAW53M - Jun 28, 09:50 UTCJun 28, 10:55 UTC1h 5m
2026-06-27 BAW19N LHR → BDA Jun 27, 15:05 UTCJun 28, 06:00 UTC14h 55m
2026-06-27 BAW252N - Jun 27, 09:19 UTCJun 27, 10:34 UTC1h 15m
2026-06-26 BAW252N - Jun 26, 10:20 UTCJun 27, 10:14 UTC23h 55m
2026-06-26 BAW53M - Jun 26, 09:45 UTCJun 26, 10:39 UTC55m
2026-06-25 BAW9E EWR → LHR Jun 25, 22:20 UTCJun 26, 04:14 UTC5h 55m
2026-06-25 BAW185 LHR → EWR Jun 25, 10:45 UTCJun 25, 18:04 UTC7h 20m
2026-06-24 BAW216 IAD → LHR Jun 24, 22:29 UTCJun 25, 05:09 UTC6h 40m
2026-06-24 BAW7W - Jun 24, 12:14 UTCJun 24, 19:49 UTC7h 35m
2026-06-23 BAW216 IAD → LHR Jun 23, 22:44 UTCJun 24, 05:34 UTC6h 50m
2026-06-23 BAW7W - Jun 23, 12:15 UTCJun 23, 20:24 UTC8h 10m
2026-06-23 BAW172 JFK → LHR Jun 23, 01:25 UTCJun 23, 07:35 UTC6h 10m
2026-06-22 BAW7NY - Jun 22, 09:54 UTCJun 22, 17:00 UTC7h 5m
2026-06-21 BAW11J - Jun 21, 23:14 UTCJun 22, 05:24 UTC6h 10m
2026-06-21 BAW181 LHR → EWR Jun 21, 12:04 UTCJun 21, 19:00 UTC6h 55m
2026-06-21 BAW172 JFK → LHR Jun 21, 01:45 UTCJun 21, 07:49 UTC6h 5m
2026-06-20 BAW7NY - Jun 20, 09:44 UTCJun 20, 16:49 UTC7h 5m
2026-06-19 BAW11J JFK → LHR Jun 19, 23:39 UTCJun 20, 05:39 UTC6h 0m

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

Mode-S 4005B9 frequently asked

What is Mode-S code 4005B9?
4005B9 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-VIIA.
Where is Mode-S 4005B9 registered?
Mode-S code 4005B9 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 4005B9 broadcasting right now?
No active broadcast right now. Last signal was 6h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4005B9, octal 20002671, decimal 4,195,769.
What flights does 4005B9 operate?
Mode-S 4005B9 has broadcast 20 distinct callsigns, including BAW252N, BAW172, BAW7W, BAW7NY, BAW255T.