Apparatus

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sensors Mode-S transponder

400683

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-VIIK · BOEING 777-200

Hex
400683
Octal
20003203
Decimal
4,195,971
Country
GB
Tail
G-VIIK
Type
B772
Broadcasting now · callsign BAW290 · 39,000 ft
Flights observed
107
Distinct callsigns
20
Country
GB
Last broadcast
52m ago

Current position

400683 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 400683 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 8 2026-05-14
BAW255T British Airways 8 2026-05-18
BAW23T British Airways 8 2026-05-15
BAW25GP British Airways 7 2026-05-19
BAW11J British Airways 5 2026-05-12
BAW7W British Airways 4 2026-05-21
BAW51B British Airways 4 2026-05-18
BAW50G British Airways 4 2026-05-17
BAW252N British Airways 4 2026-05-14
BAW216 British Airways 4 2026-05-21
BAW181 British Airways 4 2026-05-11
BAW17R British Airways 4 2026-05-26
BAW9E British Airways 3 2026-05-27
BAW7NY British Airways 3 2026-05-22
BAW29G British Airways 3 2026-04-13
BAW185 British Airways 3 2026-05-27
BAW176A British Airways 3 2026-05-27
BAW172 British Airways 3 2026-05-23
BAW82 British Airways 2 2026-04-14
BAW7CP British Airways 2 2026-05-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 BAW290 LHR → IAD May 29, 23:40 UTCMay 30, 00:45 UTC1h 5m
2026-05-29 BAW291 LHR → SFO May 29, 13:50 UTCMay 29, 21:00 UTC7h 10m
2026-05-27 BAW9E EWR → LHR May 27, 22:20 UTCMay 28, 04:40 UTC6h 20m
2026-05-27 BAW185 LHR → EWR May 27, 11:00 UTCMay 27, 17:50 UTC6h 50m
2026-05-27 BAW176A JFK → LHR May 27, 00:10 UTCMay 27, 06:40 UTC6h 30m
2026-05-26 BAW17R LHR → JFK May 26, 13:00 UTCMay 26, 14:55 UTC1h 55m
2026-05-26 BAW17R LHR → JFK May 26, 07:55 UTCMay 26, 09:09 UTC1h 15m
2026-05-25 BAW9E EWR → LHR May 25, 22:10 UTCMay 26, 04:24 UTC6h 15m
2026-05-25 BAW185 LHR → EWR May 25, 10:25 UTCMay 25, 17:40 UTC7h 15m
2026-05-25 BAW116 JFK → LHR May 25, 01:55 UTCMay 25, 07:30 UTC5h 35m
2026-05-24 BAW15K LHR → JFK May 24, 15:00 UTCMay 24, 21:45 UTC6h 45m
2026-05-23 BAW172 JFK → LHR May 23, 01:25 UTCMay 23, 07:35 UTC6h 9m
2026-05-22 BAW7NY LHR → JFK May 22, 09:45 UTCMay 22, 16:45 UTC7h 0m
2026-05-21 BAW216 IAD → LHR May 21, 23:05 UTCMay 22, 05:25 UTC6h 20m
2026-05-21 BAW7W LHR → IAD May 21, 13:10 UTCMay 21, 20:45 UTC7h 35m
2026-05-21 BAW172 JFK → LHR May 21, 04:10 UTCMay 21, 10:15 UTC6h 5m
2026-05-20 BAW7NY LHR → JFK May 20, 09:50 UTCMay 20, 16:55 UTC7h 5m
2026-05-19 BAW25GP BGI → LHR May 19, 10:50 UTCMay 20, 05:05 UTC18h 16m
2026-05-19 BAW25GP BGI → LHR May 19, 10:35 UTCMay 20, 05:05 UTC18h 31m
2026-05-18 BAW255T LHR → BGI May 18, 11:25 UTCMay 19, 06:15 UTC18h 49m
2026-05-18 BAW51B BOS → LHR May 18, 02:25 UTCMay 18, 08:35 UTC6h 10m
2026-05-17 BAW50G LHR → BOS May 17, 17:20 UTCMay 18, 00:00 UTC6h 40m
2026-05-17 BAW6AC ORD → LHR May 17, 02:45 UTCMay 17, 09:55 UTC7h 10m
2026-05-16 BAW7CP LHR → ORD May 16, 14:41 UTCMay 16, 22:35 UTC7h 55m
2026-05-16 BAW6AC ORD → LHR May 16, 03:25 UTCMay 16, 10:20 UTC6h 56m
2026-05-15 BAW7CP LHR → ORD May 15, 15:30 UTCMay 15, 23:25 UTC7h 55m
2026-05-15 BAW23T ATL → LHR May 15, 04:50 UTCMay 15, 12:10 UTC7h 20m
2026-05-14 BAW7TG LHR → ATL May 14, 17:35 UTCMay 15, 02:10 UTC8h 35m
2026-05-14 BAW252N NAS → LHR May 14, 00:00 UTCMay 14, 09:55 UTC9h 55m
2026-05-13 BAW252N NAS → LHR May 13, 10:50 UTCMay 14, 09:55 UTC23h 5m
2026-05-13 BAW53M LHR → NAS May 13, 09:50 UTCMay 14, 08:45 UTC22h 55m
2026-05-12 BAW216 IAD → LHR May 12, 22:10 UTCMay 13, 05:10 UTC7h 0m
2026-05-12 BAW7W LHR → IAD May 12, 12:10 UTCMay 12, 19:50 UTC7h 40m
2026-05-12 BAW11J JFK → LHR May 12, 04:00 UTCMay 12, 05:25 UTC1h 25m
2026-05-11 BAW181 LHR → EWR May 11, 11:55 UTCMay 11, 18:55 UTC7h 0m
2026-05-11 BAW172 JFK → LHR May 11, 01:30 UTCMay 11, 07:45 UTC6h 15m
2026-05-10 BAW7NY LHR → JFK May 10, 09:35 UTCMay 10, 16:34 UTC7h 0m
2026-05-09 BAW11J JFK → LHR May 9, 22:55 UTCMay 10, 05:40 UTC6h 45m
2026-05-09 BAW181 LHR → EWR May 9, 11:55 UTCMay 9, 18:55 UTC7h 0m
2026-05-08 BAW176A JFK → LHR May 8, 23:50 UTCMay 9, 06:20 UTC6h 30m
2026-05-08 BAW17R LHR → JFK May 8, 07:50 UTCMay 8, 15:05 UTC7h 15m
2026-05-07 BAW178 JFK → LHR May 7, 12:15 UTCMay 7, 18:35 UTC6h 20m
2026-05-06 BAW183 LHR → JFK May 6, 18:50 UTCMay 7, 02:05 UTC7h 15m
2026-05-06 BAW25GP BGI → LHR May 6, 03:50 UTCMay 6, 05:10 UTC1h 20m
2026-05-05 BAW255T LHR → BGI May 5, 10:35 UTCMay 5, 13:35 UTC3h 0m
2026-05-04 BAW290 LHR → IAD May 4, 23:25 UTCMay 5, 06:20 UTC6h 55m
2026-05-04 BAW291 LHR → SFO May 4, 13:30 UTCMay 4, 21:00 UTC7h 31m
2026-05-03 BAW9E EWR → LHR May 3, 22:00 UTCMay 4, 04:29 UTC6h 30m
2026-05-03 BAW185 LHR → EWR May 3, 10:40 UTCMay 3, 18:09 UTC7h 30m
2026-05-02 BAW216 IAD → LHR May 2, 22:05 UTCMay 3, 05:10 UTC7h 4m

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

Mode-S 400683 frequently asked

What is Mode-S code 400683?
400683 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-VIIK.
Where is Mode-S 400683 registered?
Mode-S code 400683 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 400683 broadcasting right now?
Yes. Mode-S 400683 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 400683, octal 20003203, decimal 4,195,971.
What flights does 400683 operate?
Mode-S 400683 has broadcast 20 distinct callsigns, including BAW7TG, BAW255T, BAW23T, BAW25GP, BAW11J.