Apparatus

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sensors Mode-S transponder

400776

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-VIIY · BOEING 777-200

Hex
400776
Octal
20003566
Decimal
4,196,214
Country
GB
Tail
G-VIIY
Type
B772
No current signal · last broadcast 3h ago
Flights observed
183
Distinct callsigns
20
Country
GB
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S 400776.

Country allocation

The ICAO 24-bit address 400776 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
BAW17R - 12 2026-07-07
BAW255T - 9 2026-06-28
BAW18B - 8 2026-07-03
BAW176A - 8 2026-07-08
BAW7NY - 7 2026-07-09
BAW29G British Airways 7 2026-07-13
BAW239 - 7 2026-07-12
BAW185 - 7 2026-07-08
BAW181 British Airways 7 2026-06-24
BAW172 - 7 2026-07-10
BAW9E - 6 2026-07-08
BAW25GP - 6 2026-06-29
BAW120 - 6 2026-06-21
BAW11J - 6 2026-06-24
BAW82 - 5 2026-07-13
BAW7W - 5 2026-06-14
BAW21V British Airways 5 2026-05-04
BAW216 - 5 2026-06-14
BAW19N British Airways 5 2026-05-17
BAW7TG - 4 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 BAW7TG - Jul 14, 17:15 UTCJul 14, 18:25 UTC1h 10m
2026-07-13 BAW82 - Jul 13, 22:05 UTCJul 14, 13:10 UTC15h 5m
2026-07-13 BAW29G BOS → LHR Jul 13, 14:00 UTCJul 13, 18:00 UTC4h 0m
2026-07-13 BAW29G BOS → LHR Jul 13, 11:40 UTCJul 13, 13:05 UTC1h 25m
2026-07-12 BAW239 - Jul 12, 20:05 UTCJul 13, 02:35 UTC6h 30m
2026-07-12 BAW62 - Jul 12, 10:35 UTCJul 12, 15:20 UTC4h 45m
2026-07-11 BAW63 - Jul 11, 19:05 UTCJul 11, 22:55 UTC3h 50m
2026-07-11 - - Jul 11, 09:25 UTCJul 11, 09:35 UTC10m
2026-07-11 BAW180 JFK → LHR Jul 11, 00:00 UTCJul 11, 06:15 UTC6h 15m
2026-07-10 BAW04A LHR → JFK Jul 10, 12:45 UTCJul 10, 20:10 UTC7h 25m
2026-07-10 BAW172 JFK → LHR Jul 10, 01:15 UTCJul 10, 07:35 UTC6h 20m
2026-07-09 BAW7NY LHR → JFK Jul 9, 09:40 UTCJul 9, 16:35 UTC6h 55m
2026-07-08 BAW9E EWR → LHR Jul 8, 22:20 UTCJul 9, 04:45 UTC6h 25m
2026-07-08 BAW185 - Jul 8, 10:45 UTCJul 8, 17:45 UTC7h 0m
2026-07-08 BAW176A JFK → LHR Jul 8, 01:10 UTCJul 8, 07:40 UTC6h 30m
2026-07-07 BAW17R - Jul 7, 13:30 UTCJul 7, 15:15 UTC1h 45m
2026-07-07 BAW17R - Jul 7, 08:20 UTCJul 7, 09:40 UTC1h 20m
2026-07-06 BAW29G BOS → LHR Jul 6, 11:45 UTCJul 6, 17:45 UTC6h 0m
2026-07-05 BAW239 - Jul 5, 19:40 UTCJul 6, 02:45 UTC7h 5m
2026-07-05 BAW252N - Jul 5, 06:25 UTCJul 5, 11:10 UTC4h 45m
2026-07-04 BAW53M - Jul 4, 09:35 UTCJul 5, 06:40 UTC21h 5m
2026-07-03 BAW18B - Jul 3, 14:00 UTCJul 4, 05:35 UTC15h 35m
2026-07-03 BAW23T ATL → LHR Jul 3, 03:10 UTCJul 3, 10:40 UTC7h 30m
2026-07-02 BAW7TG - Jul 2, 16:15 UTCJul 3, 00:45 UTC8h 30m
2026-07-01 BAW18B - Jul 1, 13:50 UTCJul 2, 05:30 UTC15h 40m
2026-07-01 BAW23T ATL → LHR Jul 1, 02:55 UTCJul 1, 10:30 UTC7h 35m
2026-06-30 BAW7TG - Jun 30, 21:30 UTCJul 1, 00:10 UTC2h 40m
2026-06-30 BAW7TG - Jun 30, 15:55 UTCJun 30, 21:25 UTC5h 30m
2026-06-30 BAW252N - Jun 30, 09:10 UTCJun 30, 10:15 UTC1h 5m
2026-06-29 BAW53M - Jun 29, 09:40 UTCJun 30, 09:30 UTC23h 51m
2026-06-29 BAW25GP - Jun 29, 04:00 UTCJun 29, 05:15 UTC1h 15m
2026-06-28 BAW255T - Jun 28, 18:44 UTCJun 28, 18:59 UTC15m
2026-06-28 BAW255T - Jun 28, 10:44 UTCJun 28, 11:39 UTC55m
2026-06-28 BAW290 IAD → LHR Jun 28, 00:20 UTCJun 28, 06:49 UTC6h 30m
2026-06-27 BAW291 - Jun 27, 15:00 UTCJun 27, 22:09 UTC7h 10m
2026-06-26 BAW25GP - Jun 26, 10:39 UTCJun 27, 05:04 UTC18h 25m
2026-06-26 BAW25GP - Jun 26, 03:10 UTCJun 26, 04:24 UTC1h 15m
2026-06-25 - - Jun 25, 14:55 UTCJun 25, 15:04 UTC10m
2026-06-25 BAW255T - Jun 25, 10:04 UTCJun 25, 11:04 UTC1h 0m
2026-06-24 BAW11J JFK → LHR Jun 24, 23:29 UTCJun 25, 05:29 UTC6h 0m
2026-06-24 BAW181 LHR → EWR Jun 24, 11:59 UTCJun 24, 19:10 UTC7h 10m
2026-06-23 BAW11J JFK → LHR Jun 23, 23:34 UTCJun 24, 05:49 UTC6h 15m
2026-06-23 BAW181 LHR → EWR Jun 23, 12:09 UTCJun 23, 19:19 UTC7h 10m
2026-06-23 BAW51B - Jun 23, 02:09 UTCJun 23, 08:09 UTC6h 0m
2026-06-22 BAW50G LHR → BOS Jun 22, 17:04 UTCJun 22, 23:45 UTC6h 40m
2026-06-21 BAW82 - Jun 21, 22:04 UTCJun 22, 13:10 UTC15h 5m
2026-06-21 BAW29G BOS → LHR Jun 21, 11:44 UTCJun 21, 17:35 UTC5h 50m
2026-06-21 BAW120 - Jun 21, 08:35 UTCJun 21, 08:44 UTC10m
2026-06-21 BAW239 - Jun 21, 00:55 UTCJun 21, 02:15 UTC1h 20m
2026-06-20 BAW239 - Jun 20, 19:40 UTCJun 20, 21:00 UTC1h 20m

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

Mode-S 400776 frequently asked

What is Mode-S code 400776?
400776 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-VIIY.
Where is Mode-S 400776 registered?
Mode-S code 400776 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 400776 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 400776, octal 20003566, decimal 4,196,214.
What flights does 400776 operate?
Mode-S 400776 has broadcast 20 distinct callsigns, including BAW17R, BAW255T, BAW18B, BAW176A, BAW7NY.