Apparatus

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sensors Mode-S transponder

400685

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-VIIM · BOEING 777-200

Hex
400685
Octal
20003205
Decimal
4,195,973
Country
GB
Tail
G-VIIM
Type
B772
No current signal · last broadcast 1h ago
Flights observed
108
Distinct callsigns
20
Country
GB
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 400685.

Country allocation

The ICAO 24-bit address 400685 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
BAW7TG British Airways 13 2026-05-16
BAW23T British Airways 13 2026-05-17
BAW216 British Airways 6 2026-04-21
BAW183 British Airways 6 2026-05-27
BAW178 British Airways 6 2026-05-28
BAW7NY British Airways 5 2026-05-18
BAW172 British Airways 5 2026-05-19
BAW7W British Airways 4 2026-04-21
BAW290 British Airways 4 2026-04-18
BAW17R British Airways 4 2026-04-23
BAW176A British Airways 4 2026-04-24
BAW9E British Airways 3 2026-05-11
BAW82 British Airways 3 2026-05-28
BAW50G British Airways 3 2026-05-29
BAW29G British Airways 3 2026-05-26
BAW291 - 3 2026-04-17
BAW239 British Airways 3 2026-05-25
BAW185 British Airways 3 2026-05-11
BAW181 British Airways 3 2026-05-17
BAW11J British Airways 3 2026-05-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 BAW50G LHR → BOS May 29, 17:15 UTCMay 29, 23:45 UTC6h 30m
2026-05-28 BAW82 ABV → LHR May 28, 22:35 UTCMay 29, 13:05 UTC14h 30m
2026-05-28 BAW178 JFK → LHR May 28, 12:05 UTCMay 28, 18:30 UTC6h 25m
2026-05-27 BAW183 LHR → JFK May 27, 18:50 UTCMay 28, 01:35 UTC6h 45m
2026-05-26 BAW29G BOS → LHR May 26, 11:39 UTCMay 26, 18:05 UTC6h 25m
2026-05-25 BAW239 LHR → BOS May 25, 20:04 UTCMay 26, 02:39 UTC6h 35m
2026-05-24 BAW29G BOS → LHR May 24, 11:35 UTCMay 24, 17:30 UTC5h 55m
2026-05-23 BAW239 LHR → BOS May 23, 19:40 UTCMay 24, 02:10 UTC6h 30m
2026-05-22 BAW82 ABV → LHR May 22, 21:55 UTCMay 23, 13:35 UTC15h 40m
2026-05-22 BAW29G BOS → LHR May 22, 12:05 UTCMay 22, 17:50 UTC5h 45m
2026-05-21 BAW239 LHR → BOS May 21, 19:30 UTCMay 22, 02:05 UTC6h 35m
2026-05-20 BAW82 ABV → LHR May 20, 21:50 UTCMay 21, 13:05 UTC15h 15m
2026-05-20 BAW178 JFK → LHR May 20, 12:10 UTCMay 20, 18:40 UTC6h 30m
2026-05-19 BAW183 LHR → JFK May 19, 18:45 UTCMay 20, 01:40 UTC6h 55m
2026-05-19 BAW172 JFK → LHR May 19, 01:55 UTCMay 19, 08:30 UTC6h 35m
2026-05-18 BAW7NY LHR → JFK May 18, 09:45 UTCMay 18, 16:35 UTC6h 50m
2026-05-17 BAW11J JFK → LHR May 17, 23:15 UTCMay 18, 05:30 UTC6h 15m
2026-05-17 BAW181 LHR → EWR May 17, 13:10 UTCMay 17, 20:05 UTC6h 55m
2026-05-17 BAW23T ATL → LHR May 17, 02:50 UTCMay 17, 10:25 UTC7h 35m
2026-05-16 BAW7TG LHR → ATL May 16, 15:35 UTCMay 17, 00:05 UTC8h 30m
2026-05-15 BAW252N NAS → LHR May 15, 20:55 UTCMay 16, 10:25 UTC13h 31m
2026-05-15 BAW252N NAS → LHR May 15, 11:20 UTCMay 16, 10:25 UTC23h 5m
2026-05-15 BAW53M LHR → NAS May 15, 10:20 UTCMay 16, 09:16 UTC22h 55m
2026-05-13 BAW178 JFK → LHR May 13, 12:15 UTCMay 13, 18:40 UTC6h 25m
2026-05-12 BAW183 LHR → JFK May 12, 19:00 UTCMay 13, 02:10 UTC7h 10m
2026-05-11 BAW9E EWR → LHR May 11, 22:05 UTCMay 12, 04:10 UTC6h 5m
2026-05-11 BAW185 LHR → EWR May 11, 10:35 UTCMay 11, 18:00 UTC7h 26m
2026-05-10 BAW11J JFK → LHR May 10, 23:29 UTCMay 11, 05:45 UTC6h 15m
2026-05-10 BAW181 LHR → EWR May 10, 12:00 UTCMay 10, 18:49 UTC6h 50m
2026-05-10 BAW172 JFK → LHR May 10, 01:30 UTCMay 10, 08:20 UTC6h 50m
2026-05-09 BAW7NY LHR → JFK May 9, 09:50 UTCMay 9, 16:45 UTC6h 55m
2026-05-08 BAW11J JFK → LHR May 8, 23:10 UTCMay 9, 05:40 UTC6h 30m
2026-05-08 BAW181 LHR → EWR May 8, 11:49 UTCMay 8, 18:55 UTC7h 5m
2026-05-08 BAW51B BOS → LHR May 8, 02:19 UTCMay 8, 08:09 UTC5h 50m
2026-05-07 BAW50G LHR → BOS May 7, 17:00 UTCMay 8, 00:05 UTC7h 4m
2026-05-07 BAW23T ATL → LHR May 7, 03:40 UTCMay 7, 11:00 UTC7h 20m
2026-05-06 BAW7TG LHR → ATL May 6, 15:55 UTCMay 7, 00:55 UTC8h 59m
2026-05-06 BAW23T ATL → LHR May 6, 09:05 UTCMay 6, 10:25 UTC1h 20m
2026-05-06 BAW23T ATL → LHR May 6, 02:45 UTCMay 6, 05:30 UTC2h 45m
2026-05-05 BAW7TG LHR → ATL May 5, 15:45 UTCMay 6, 00:05 UTC8h 20m
2026-05-05 BAW23T ATL → LHR May 5, 02:50 UTCMay 5, 10:35 UTC7h 45m
2026-05-04 BAW7TG LHR → ATL May 4, 15:55 UTCMay 5, 00:10 UTC8h 16m
2026-05-04 BAW23T ATL → LHR May 4, 02:50 UTCMay 4, 10:30 UTC7h 40m
2026-05-03 BAW7TG LHR → ATL May 3, 16:00 UTCMay 4, 00:25 UTC8h 25m
2026-05-03 BAW23T ATL → LHR May 3, 02:35 UTCMay 3, 10:10 UTC7h 34m
2026-05-02 BAW7TG LHR → ATL May 2, 15:45 UTCMay 3, 00:05 UTC8h 20m
2026-05-02 BAW23T ATL → LHR May 2, 02:40 UTCMay 2, 10:25 UTC7h 45m
2026-05-01 BAW7TG LHR → ATL May 1, 15:55 UTCMay 2, 00:10 UTC8h 15m
2026-05-01 BAW23T ATL → LHR May 1, 02:30 UTCMay 1, 10:25 UTC7h 55m
2026-04-30 BAW7TG LHR → ATL Apr 30, 20:35 UTCApr 30, 23:45 UTC3h 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-VIIM page for operator, model, and routing details .

Mode-S 400685 frequently asked

What is Mode-S code 400685?
400685 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-VIIM.
Where is Mode-S 400685 registered?
Mode-S code 400685 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 400685 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 400685, octal 20003205, decimal 4,195,973.
What flights does 400685 operate?
Mode-S 400685 has broadcast 20 distinct callsigns, including BAW7TG, BAW23T, BAW216, BAW183, BAW178.