Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

400684

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-VIIL · BOEING 777-200

Hex
400684
Octal
20003204
Decimal
4,195,972
Country
GB
Tail
G-VIIL
Type
B772
No current signal · last broadcast 7h ago
Flights observed
94
Distinct callsigns
20
Country
GB
Last broadcast
7h ago

Last known position

Most recent position reported by Mode-S 400684.

Country allocation

The ICAO 24-bit address 400684 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 British Airways 7 2026-05-11
BAW7NY British Airways 6 2026-05-01
BAW183 British Airways 6 2026-05-25
BAW178 British Airways 6 2026-05-26
BAW53M British Airways 5 2026-05-10
BAW19N British Airways 4 2026-05-11
BAW18B British Airways 4 2026-05-12
BAW180 British Airways 4 2026-04-18
BAW176A British Airways 4 2026-05-06
BAW172 British Airways 4 2026-05-02
BAW04A British Airways 4 2026-04-17
BAW82 British Airways 3 2026-05-26
BAW2LJ British Airways 3 2026-04-17
BAW22B British Airways 3 2026-04-16
BAW9ZY British Airways 2 2026-04-30
BAW9E British Airways 2 2026-05-16
BAW7W British Airways 2 2026-05-06
BAW5CA British Airways 2 2026-04-30
BAW255T British Airways 2 2026-04-22
BAW216 British Airways 2 2026-05-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 BAW173A LHR → JFK May 29, 11:15 UTCMay 29, 18:00 UTC6h 45m
2026-05-28 BAW11J JFK → LHR May 28, 23:20 UTCMay 29, 05:35 UTC6h 15m
2026-05-28 BAW181 LHR → EWR May 28, 12:15 UTCMay 28, 19:05 UTC6h 50m
2026-05-28 BAW51B BOS → LHR May 28, 02:15 UTCMay 28, 08:25 UTC6h 10m
2026-05-27 BAW50G LHR → BOS May 27, 17:05 UTCMay 27, 23:35 UTC6h 30m
2026-05-26 BAW82 ABV → LHR May 26, 21:59 UTCMay 27, 13:05 UTC15h 6m
2026-05-26 BAW178 JFK → LHR May 26, 12:05 UTCMay 26, 18:40 UTC6h 35m
2026-05-25 BAW183 LHR → JFK May 25, 18:55 UTCMay 26, 02:10 UTC7h 15m
2026-05-24 BAW82 ABV → LHR May 24, 23:00 UTCMay 25, 13:10 UTC14h 10m
2026-05-24 BAW178 JFK → LHR May 24, 12:15 UTCMay 24, 18:40 UTC6h 25m
2026-05-23 BAW183 LHR → JFK May 23, 19:05 UTCMay 24, 02:20 UTC7h 15m
2026-05-23 BAW6AC ORD → LHR May 23, 02:40 UTCMay 23, 09:40 UTC7h 0m
2026-05-22 BAW7CP LHR → ORD May 22, 14:45 UTCMay 22, 22:40 UTC7h 55m
2026-05-22 BAW23T ATL → LHR May 22, 04:05 UTCMay 22, 11:20 UTC7h 14m
2026-05-21 BAW7TG LHR → ATL May 21, 16:50 UTCMay 22, 01:05 UTC8h 15m
2026-05-16 BAW9E EWR → LHR May 16, 22:25 UTCMay 17, 04:35 UTC6h 10m
2026-05-16 BAW185 LHR → EWR May 16, 10:35 UTCMay 16, 17:50 UTC7h 15m
2026-05-15 BAW178 JFK → LHR May 15, 12:15 UTCMay 15, 18:25 UTC6h 9m
2026-05-14 BAW183 LHR → JFK May 14, 20:30 UTCMay 15, 03:40 UTC7h 10m
2026-05-13 BAW82 ABV → LHR May 13, 22:35 UTCMay 14, 13:45 UTC15h 10m
2026-05-13 BAW29G BOS → LHR May 13, 11:30 UTCMay 13, 17:50 UTC6h 20m
2026-05-12 BAW239 LHR → BOS May 12, 19:55 UTCMay 13, 02:35 UTC6h 40m
2026-05-12 BAW18B BDA → LHR May 12, 03:50 UTCMay 12, 05:20 UTC1h 30m
2026-05-11 BAW19N LHR → BDA May 11, 13:40 UTCMay 11, 14:35 UTC55m
2026-05-11 BAW252N NAS → LHR May 11, 09:10 UTCMay 11, 10:35 UTC1h 25m
2026-05-10 BAW53M LHR → NAS May 10, 09:55 UTCMay 10, 11:05 UTC1h 10m
2026-05-09 BAW18B BDA → LHR May 9, 14:25 UTCMay 10, 05:55 UTC15h 30m
2026-05-09 BAW252N NAS → LHR May 9, 09:15 UTCMay 9, 10:30 UTC1h 15m
2026-05-08 BAW53M LHR → NAS May 8, 09:49 UTCMay 8, 11:14 UTC1h 25m
2026-05-06 BAW216 IAD → LHR May 6, 22:15 UTCMay 7, 05:05 UTC6h 50m
2026-05-06 BAW7W LHR → IAD May 6, 11:55 UTCMay 6, 19:35 UTC7h 40m
2026-05-06 BAW176A JFK → LHR May 6, 00:10 UTCMay 6, 06:35 UTC6h 25m
2026-05-05 BAW17R LHR → JFK May 5, 07:45 UTCMay 5, 14:45 UTC7h 0m
2026-05-04 BAW9E EWR → LHR May 4, 22:10 UTCMay 5, 04:20 UTC6h 10m
2026-05-04 BAW185 LHR → EWR May 4, 12:15 UTCMay 4, 19:10 UTC6h 56m
2026-05-02 BAW461 MAD → LHR May 2, 16:25 UTCMay 2, 18:15 UTC1h 50m
2026-05-02 BAW46EZ LHR → MAD May 2, 12:10 UTCMay 2, 14:00 UTC1h 50m
2026-05-02 BAW172 JFK → LHR May 2, 01:15 UTCMay 2, 07:55 UTC6h 40m
2026-05-01 BAW7NY LHR → JFK May 1, 09:50 UTCMay 1, 16:35 UTC6h 45m
2026-04-30 BAW5CA YYZ → LHR Apr 30, 22:35 UTCMay 1, 05:15 UTC6h 40m
2026-04-30 BAW9ZY LHR → YYZ Apr 30, 13:10 UTCApr 30, 20:00 UTC6h 50m
2026-04-30 BAW14K JFK → LHR Apr 30, 02:00 UTCApr 30, 08:40 UTC6h 40m
2026-04-29 BAW33K LHR → JFK Apr 29, 16:00 UTCApr 29, 22:45 UTC6h 45m
2026-04-29 BAW18B BDA → LHR Apr 29, 04:05 UTCApr 29, 05:20 UTC1h 15m
2026-04-28 BAW19N LHR → BDA Apr 28, 14:00 UTCApr 28, 14:55 UTC55m
2026-04-28 BAW252N NAS → LHR Apr 28, 08:50 UTCApr 28, 10:20 UTC1h 30m
2026-04-27 BAW252N NAS → LHR Apr 27, 11:05 UTCApr 28, 10:20 UTC23h 15m
2026-04-27 BAW53M LHR → NAS Apr 27, 10:05 UTCApr 28, 09:00 UTC22h 55m
2026-04-26 BAW19N LHR → BDA Apr 26, 13:45 UTCApr 27, 05:40 UTC15h 55m
2026-04-26 BAW252N NAS → LHR Apr 26, 09:10 UTCApr 26, 10:15 UTC1h 5m

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

Mode-S 400684 frequently asked

What is Mode-S code 400684?
400684 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-VIIL.
Where is Mode-S 400684 registered?
Mode-S code 400684 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 400684 broadcasting right now?
No active broadcast right now. Last signal was 7h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 400684, octal 20003204, decimal 4,195,972.
What flights does 400684 operate?
Mode-S 400684 has broadcast 20 distinct callsigns, including BAW252N, BAW7NY, BAW183, BAW178, BAW53M.