Apparatus

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sensors Mode-S transponder

400773

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-VIIV · BOEING 777-200

Hex
400773
Octal
20003563
Decimal
4,196,211
Country
GB
Tail
G-VIIV
Type
B772
Broadcasting now · callsign BAW23T · 38,000 ft
Flights observed
219
Distinct callsigns
20
Country
GB
Last broadcast
Jul 26, 22:45 UTC

Current position

400773 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 400773 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
BAW18B British Airways 12 2026-07-21
BAW19N - 11 2026-07-07
BAW252N British Airways 10 2026-07-21
BAW23T - 10 2026-07-06
BAW7TG - 9 2026-07-05
BAW82 British Airways 8 2026-07-23
BAW53M British Airways 8 2026-06-10
BAW51B British Airways 8 2026-07-25
BAW172 British Airways 8 2026-05-08
BAW7NY British Airways 7 2026-05-07
BAW50G British Airways 7 2026-07-24
BAW298 British Airways 7 2026-04-16
BAW185 British Airways 7 2026-05-24
BAW9E British Airways 6 2026-05-24
BAW183 British Airways 6 2026-07-18
BAW17R - 6 2026-06-27
BAW178 - 6 2026-07-19
BAW7W - 5 2026-07-02
BAW29G British Airways 5 2026-07-23
BAW216 - 5 2026-07-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 BAW223N LHR → BNA Jul 26, 14:50 UTCJul 26, 22:45 UTC7h 55m
2026-07-26 BAW22E BNA → LHR Jul 26, 01:50 UTCJul 26, 09:25 UTC7h 36m
2026-07-25 BAW223N LHR → BNA Jul 25, 14:50 UTCJul 25, 23:10 UTC8h 20m
2026-07-25 BAW51B BOS → LHR Jul 25, 02:40 UTCJul 25, 08:20 UTC5h 40m
2026-07-24 BAW50G LHR → BOS Jul 24, 17:15 UTCJul 24, 23:50 UTC6h 35m
2026-07-23 BAW82 ABV → LHR Jul 23, 22:10 UTCJul 24, 13:00 UTC14h 50m
2026-07-23 BAW29G BOS → LHR Jul 23, 12:20 UTCJul 23, 18:05 UTC5h 45m
2026-07-22 BAW239 LHR → BOS Jul 22, 19:35 UTCJul 23, 02:10 UTC6h 35m
2026-07-21 BAW18B BDA → LHR Jul 21, 13:55 UTCJul 22, 05:25 UTC15h 30m
2026-07-21 BAW252N NAS → LHR Jul 21, 09:05 UTCJul 21, 10:45 UTC1h 40m
2026-07-20 BAW252N NAS → LHR Jul 20, 10:50 UTCJul 21, 10:45 UTC23h 55m
2026-07-19 BAW178 JFK → LHR Jul 19, 12:35 UTCJul 19, 19:20 UTC6h 45m
2026-07-18 BAW183 LHR → JFK Jul 18, 18:50 UTCJul 19, 01:55 UTC7h 5m
2026-07-17 BAW82 - Jul 17, 22:05 UTCJul 18, 12:55 UTC14h 51m
2026-07-17 BAW178 JFK → LHR Jul 17, 12:15 UTCJul 17, 18:44 UTC6h 30m
2026-07-16 BAW183 LHR → JFK Jul 16, 18:50 UTCJul 17, 01:49 UTC7h 0m
2026-07-15 BAW82 - Jul 15, 22:30 UTCJul 16, 13:15 UTC14h 45m
2026-07-15 BAW178 JFK → LHR Jul 15, 13:00 UTCJul 15, 19:10 UTC6h 10m
2026-07-15 BAW98T - Jul 15, 08:50 UTCJul 15, 09:05 UTC15m
2026-07-14 BAW183 - Jul 14, 19:05 UTCJul 15, 02:05 UTC6h 59m
2026-07-13 BAW180 JFK → LHR Jul 13, 23:40 UTCJul 14, 06:05 UTC6h 25m
2026-07-13 BAW04A - Jul 13, 14:20 UTCJul 13, 21:10 UTC6h 50m
2026-07-08 BAW18B - Jul 8, 04:20 UTCJul 8, 05:30 UTC1h 10m
2026-07-07 BAW19N - Jul 7, 14:25 UTCJul 7, 15:40 UTC1h 15m
2026-07-07 BAW22E - Jul 7, 02:10 UTCJul 7, 09:45 UTC7h 35m
2026-07-06 BAW223N LHR → BNA Jul 6, 15:10 UTCJul 6, 23:30 UTC8h 20m
2026-07-06 BAW23T ATL → LHR Jul 6, 03:30 UTCJul 6, 11:05 UTC7h 35m
2026-07-05 BAW7TG - Jul 5, 15:40 UTCJul 6, 00:25 UTC8h 45m
2026-07-05 BAW23T - Jul 5, 09:20 UTCJul 5, 10:35 UTC1h 15m
2026-07-05 BAW23T - Jul 5, 03:15 UTCJul 5, 06:05 UTC2h 50m
2026-07-04 BAW7TG - Jul 4, 15:25 UTCJul 5, 00:20 UTC8h 55m
2026-07-04 BAW23T ATL → LHR Jul 4, 02:55 UTCJul 4, 10:20 UTC7h 25m
2026-07-03 BAW7TG - Jul 3, 21:15 UTCJul 4, 00:20 UTC3h 5m
2026-07-03 BAW7TG - Jul 3, 15:40 UTCJul 3, 17:00 UTC1h 20m
2026-07-02 BAW216 IAD → LHR Jul 2, 22:40 UTCJul 3, 05:20 UTC6h 40m
2026-07-02 BAW7W - Jul 2, 12:05 UTCJul 2, 19:55 UTC7h 50m
2026-07-01 BAW216 IAD → LHR Jul 1, 22:15 UTCJul 2, 05:10 UTC6h 55m
2026-07-01 - - Jul 1, 13:05 UTCJul 1, 13:15 UTC10m
2026-06-29 BAW7W - Jun 29, 12:00 UTCJun 29, 19:24 UTC7h 25m
2026-06-28 BAW216 IAD → LHR Jun 28, 23:09 UTCJun 29, 05:30 UTC6h 20m
2026-06-28 BAW7W - Jun 28, 13:25 UTCJun 28, 20:54 UTC7h 30m
2026-06-28 BAW176A JFK → LHR Jun 28, 00:15 UTCJun 28, 06:20 UTC6h 5m
2026-06-27 BAW17R - Jun 27, 12:55 UTCJun 27, 14:39 UTC1h 45m
2026-06-27 BAW17R - Jun 27, 07:45 UTCJun 27, 08:55 UTC1h 10m
2026-06-26 BAW29G BOS → LHR Jun 26, 11:34 UTCJun 26, 17:35 UTC6h 0m
2026-06-25 BAW239 - Jun 25, 19:44 UTCJun 26, 02:34 UTC6h 50m
2026-06-25 BAW62 EBB → LHR Jun 25, 13:14 UTCJun 25, 15:29 UTC2h 15m
2026-06-24 BAW63 LHR → EBB Jun 24, 19:10 UTCJun 24, 23:24 UTC4h 15m
2026-06-24 BAW82 - Jun 24, 10:55 UTCJun 24, 13:00 UTC2h 5m
2026-06-24 - - Jun 24, 07:54 UTCJun 24, 08:04 UTC10m

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

Mode-S 400773 frequently asked

What is Mode-S code 400773?
400773 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-VIIV.
Where is Mode-S 400773 registered?
Mode-S code 400773 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 400773 broadcasting right now?
Yes. Mode-S 400773 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 400773, octal 20003563, decimal 4,196,211.
What flights does 400773 operate?
Mode-S 400773 has broadcast 20 distinct callsigns, including BAW18B, BAW19N, BAW252N, BAW23T, BAW7TG.