Apparatus

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sensors Mode-S transponder

400771

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-VIIT · BOEING 777-200

Hex
400771
Octal
20003561
Decimal
4,196,209
Country
GB
Tail
G-VIIT
Type
B772
No current signal · last broadcast 3h ago
Flights observed
157
Distinct callsigns
20
Country
GB
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S 400771.

Country allocation

The ICAO 24-bit address 400771 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
BAW39D - 13 2026-07-06
BAW38W - 12 2026-07-07
BAW2279 British Airways 11 2026-06-24
BAW2278 British Airways 11 2026-06-24
BAW5KW - 10 2026-06-27
BAW12J - 10 2026-06-29
BAW12TB - 9 2026-06-29
BAW9VA - 8 2026-07-03
BAW63H - 8 2026-07-11
BAW43C - 8 2026-07-11
BAW17PA - 8 2026-07-12
BAW25K - 7 2026-07-04
BAW2158 - 7 2026-07-04
BAW2067 - 7 2026-07-07
BAW2238 - 5 2026-07-02
BAW2160 - 4 2026-07-13
BAW2159 - 4 2026-07-03
BAW2239 - 3 2026-07-02
BAW2066 British Airways 3 2026-04-19
BAW23K - 2 2026-07-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 BAW2160 LGW → LGW Jul 13, 10:35 UTCJul 14, 04:05 UTC17h 30m
2026-07-12 BAW17PA LGW → LGW Jul 12, 10:25 UTCJul 13, 04:00 UTC17h 35m
2026-07-11 BAW63H MCO → LGW Jul 11, 21:25 UTCJul 12, 05:20 UTC7h 55m
2026-07-11 BAW43C - Jul 11, 10:35 UTCJul 11, 19:15 UTC8h 40m
2026-07-10 BAW63H MCO → LGW Jul 10, 21:55 UTCJul 11, 05:55 UTC8h 0m
2026-07-10 BAW43C LGW → MCO Jul 10, 11:15 UTCJul 10, 19:45 UTC8h 30m
2026-07-09 BAW17PA LGW → LGW Jul 9, 11:15 UTCJul 10, 04:30 UTC17h 15m
2026-07-08 BAW63H MCO → LGW Jul 8, 21:45 UTCJul 9, 05:50 UTC8h 5m
2026-07-08 BAW43C LGW → MCO Jul 8, 10:10 UTCJul 8, 18:50 UTC8h 40m
2026-07-07 BAW2067 LGW → LGW Jul 7, 12:40 UTCJul 8, 03:55 UTC15h 15m
2026-07-07 BAW38W MCO → LGW Jul 7, 01:25 UTCJul 7, 09:35 UTC8h 10m
2026-07-06 BAW39D LGW → MCO Jul 6, 13:55 UTCJul 6, 22:20 UTC8h 25m
2026-07-06 BAW38W MCO → LGW Jul 6, 02:50 UTCJul 6, 10:35 UTC7h 45m
2026-07-05 BAW39D LGW → MCO Jul 5, 15:10 UTCJul 5, 23:35 UTC8h 25m
2026-07-04 BAW25K - Jul 4, 21:45 UTCJul 5, 12:10 UTC14h 25m
2026-07-04 BAW25K - Jul 4, 14:20 UTCJul 5, 12:10 UTC21h 50m
2026-07-04 BAW23K LGW → LGW Jul 4, 13:50 UTCJul 5, 12:10 UTC22h 20m
2026-07-04 BAW2158 - Jul 4, 07:50 UTCJul 4, 09:05 UTC1h 15m
2026-07-04 BAW2158 - Jul 4, 01:20 UTCJul 4, 01:30 UTC10m
2026-07-03 BAW2158 - Jul 3, 23:00 UTCJul 3, 23:25 UTC25m
2026-07-03 BAW2159 - Jul 3, 20:20 UTCJul 3, 20:45 UTC25m
2026-07-03 BAW9VA - Jul 3, 10:45 UTCJul 3, 11:45 UTC1h 0m
2026-07-02 BAW2238 - Jul 2, 12:20 UTCJul 3, 06:30 UTC18h 10m
2026-07-02 BAW2239 LGW → LGW Jul 2, 11:20 UTCJul 3, 06:30 UTC19h 10m
2026-07-01 BAW2160 LGW → LGW Jul 1, 10:05 UTCJul 2, 03:50 UTC17h 45m
2026-06-30 BAW2067 LGW → LGW Jun 30, 13:15 UTCJul 1, 04:10 UTC14h 55m
2026-06-29 BAW12TB TPA → LGW Jun 29, 23:09 UTCJun 30, 07:20 UTC8h 10m
2026-06-29 BAW12J LGW → TPA Jun 29, 12:05 UTCJun 29, 20:54 UTC8h 50m
2026-06-29 BAW12TB TPA → LGW Jun 29, 01:34 UTCJun 29, 09:34 UTC8h 0m
2026-06-28 BAW12J LGW → TPA Jun 28, 14:09 UTCJun 28, 23:20 UTC9h 10m
2026-06-27 BAW5KW - Jun 27, 14:20 UTCJun 28, 10:39 UTC20h 20m
2026-06-27 BAW9VA LGW → LGW Jun 27, 13:09 UTCJun 28, 10:39 UTC21h 30m
2026-06-25 BAW2238 - Jun 25, 12:19 UTCJun 26, 06:45 UTC18h 25m
2026-06-25 BAW2238 LGW → LGW Jun 25, 11:39 UTCJun 26, 06:45 UTC19h 5m
2026-06-24 BAW2278 YVR → LGW Jun 24, 22:45 UTCJun 25, 07:49 UTC9h 5m
2026-06-24 BAW2279 LGW → YVR Jun 24, 11:05 UTCJun 24, 20:05 UTC9h 0m
2026-06-23 BAW38W MCO → LGW Jun 23, 13:24 UTCJun 23, 21:24 UTC8h 0m
2026-06-22 BAW39D LGW → MCO Jun 22, 13:44 UTCJun 22, 22:40 UTC8h 55m
2026-06-22 BAW38W MCO → LGW Jun 22, 01:40 UTCJun 22, 09:24 UTC7h 45m
2026-06-21 BAW39D LGW → MCO Jun 21, 14:24 UTCJun 21, 23:10 UTC8h 45m
2026-06-21 BAW38W MCO → LGW Jun 21, 01:19 UTCJun 21, 09:04 UTC7h 45m
2026-06-20 BAW39D LGW → MCO Jun 20, 14:05 UTCJun 20, 23:04 UTC9h 0m
2026-06-20 BAW2158 - Jun 20, 08:05 UTCJun 20, 09:34 UTC1h 30m
2026-06-19 BAW2158 - Jun 19, 12:19 UTCJun 20, 09:34 UTC21h 15m
2026-06-19 BAW9VA LGW → LGW Jun 19, 11:54 UTCJun 20, 09:34 UTC21h 40m
2026-06-18 BAW2067 LGW → ACC Jun 18, 12:05 UTCJun 19, 03:39 UTC15h 34m
2026-06-18 BAW38W MCO → LGW Jun 18, 01:20 UTCJun 18, 09:00 UTC7h 40m
2026-06-17 BAW39D LGW → MCO Jun 17, 14:00 UTCJun 17, 22:40 UTC8h 40m
2026-06-13 BAW25K KIN → LGW Jun 13, 20:50 UTCJun 14, 09:15 UTC12h 26m
2026-06-13 BAW23K LGW → LGW Jun 13, 12:40 UTCJun 14, 09:15 UTC20h 35m

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

Mode-S 400771 frequently asked

What is Mode-S code 400771?
400771 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-VIIT.
Where is Mode-S 400771 registered?
Mode-S code 400771 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 400771 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 400771, octal 20003561, decimal 4,196,209.
What flights does 400771 operate?
Mode-S 400771 has broadcast 20 distinct callsigns, including BAW39D, BAW38W, BAW2279, BAW2278, BAW5KW.