Apparatus

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sensors Mode-S transponder

400685

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-VIIM · BOEING 777-200

Hex
400685
Octal
20003205
Decimal
4,195,973
Country
GB
Tail
G-VIIM
Type
B772
No current signal · last broadcast 8h ago
Flights observed
180
Distinct callsigns
20
Country
GB
Last broadcast
8h ago

Last known position

Most recent position reported by Mode-S 400685.

Country allocation

The ICAO 24-bit address 400685 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 - 15 2026-07-12
BAW23T - 15 2026-07-13
BAW216 - 11 2026-07-03
BAW239 - 10 2026-07-13
BAW7W - 9 2026-07-03
BAW29G British Airways 9 2026-07-10
BAW178 - 9 2026-06-24
BAW183 - 8 2026-06-23
BAW17R - 7 2026-06-20
BAW176A - 7 2026-06-21
BAW7NY - 6 2026-07-02
BAW172 - 6 2026-07-03
BAW9E - 5 2026-06-19
BAW82 - 5 2026-06-22
BAW185 - 5 2026-06-19
BAW51B British Airways 4 2026-06-03
BAW50G British Airways 4 2026-06-02
BAW290 British Airways 4 2026-04-18
BAW181 British Airways 4 2026-06-03
BAW11J British Airways 4 2026-06-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 BAW239 - Jul 13, 19:35 UTCJul 14, 02:05 UTC6h 30m
2026-07-13 BAW23T ATL → LHR Jul 13, 02:55 UTCJul 13, 10:40 UTC7h 45m
2026-07-12 BAW7TG LHR → ATL Jul 12, 16:05 UTCJul 13, 00:15 UTC8h 10m
2026-07-12 BAW23T ATL → LHR Jul 12, 03:15 UTCJul 12, 10:45 UTC7h 30m
2026-07-11 BAW7TG LHR → ATL Jul 11, 15:45 UTCJul 12, 00:10 UTC8h 25m
2026-07-10 BAW29G BOS → LHR Jul 10, 11:55 UTCJul 10, 18:00 UTC6h 5m
2026-07-09 BAW239 - Jul 9, 20:25 UTCJul 10, 03:10 UTC6h 45m
2026-07-09 BAW29G BOS → LHR Jul 9, 11:35 UTCJul 9, 17:45 UTC6h 10m
2026-07-08 BAW239 - Jul 8, 20:05 UTCJul 9, 02:30 UTC6h 25m
2026-07-07 BAW20R - Jul 7, 22:45 UTCJul 8, 05:55 UTC7h 10m
2026-07-07 BAW2PD - Jul 7, 11:00 UTCJul 7, 18:45 UTC7h 45m
2026-07-06 BAW18B - Jul 6, 14:55 UTCJul 7, 06:30 UTC15h 35m
2026-07-06 BAW298 ORD → LHR Jul 6, 03:35 UTCJul 6, 10:40 UTC7h 5m
2026-07-05 BAW9602 - Jul 5, 22:00 UTCJul 5, 22:55 UTC55m
2026-07-04 BAW299 - Jul 4, 13:10 UTCJul 4, 22:05 UTC8h 55m
2026-07-03 BAW216 IAD → LHR Jul 3, 22:20 UTCJul 4, 05:10 UTC6h 50m
2026-07-03 BAW7W - Jul 3, 12:10 UTCJul 3, 19:55 UTC7h 45m
2026-07-03 BAW172 JFK → LHR Jul 3, 01:15 UTCJul 3, 07:40 UTC6h 25m
2026-07-02 BAW7NY - Jul 2, 10:55 UTCJul 2, 18:20 UTC7h 25m
2026-07-01 BAW29G BOS → LHR Jul 1, 11:35 UTCJul 1, 17:25 UTC5h 50m
2026-06-30 BAW239 - Jun 30, 20:10 UTCJul 1, 02:50 UTC6h 40m
2026-06-30 BAW29G BOS → LHR Jun 30, 11:35 UTCJun 30, 17:20 UTC5h 45m
2026-06-29 BAW239 LHR → BOS Jun 29, 19:35 UTCJun 30, 02:10 UTC6h 35m
2026-06-29 BAW62 EBB → LHR Jun 29, 13:14 UTCJun 29, 16:39 UTC3h 25m
2026-06-29 BAW63 LHR → EBB Jun 29, 05:30 UTCJun 29, 05:40 UTC10m
2026-06-28 BAW63 LHR → EBB Jun 28, 20:54 UTCJun 29, 00:24 UTC3h 30m
2026-06-28 BAW62 EBB → LHR Jun 28, 13:14 UTCJun 28, 18:00 UTC4h 45m
2026-06-27 BAW63 LHR → EBB Jun 27, 20:59 UTCJun 28, 00:25 UTC3h 25m
2026-06-26 BAW216 IAD → LHR Jun 26, 22:29 UTCJun 27, 05:04 UTC6h 35m
2026-06-26 BAW7W - Jun 26, 11:55 UTCJun 26, 19:24 UTC7h 30m
2026-06-25 BAW18B - Jun 25, 17:25 UTCJun 26, 08:20 UTC14h 55m
2026-06-24 BAW178 - Jun 24, 13:40 UTCJun 24, 18:20 UTC4h 40m
2026-06-24 BAW178 - Jun 24, 12:14 UTCJun 24, 13:34 UTC1h 20m
2026-06-23 BAW183 - Jun 23, 19:00 UTCJun 24, 02:09 UTC7h 10m
2026-06-22 BAW82 - Jun 22, 22:05 UTCJun 23, 13:24 UTC15h 20m
2026-06-22 BAW178 JFK → LHR Jun 22, 12:15 UTCJun 22, 18:30 UTC6h 15m
2026-06-21 BAW183 - Jun 21, 18:44 UTCJun 22, 01:40 UTC6h 55m
2026-06-21 BAW176A JFK → LHR Jun 21, 00:14 UTCJun 21, 06:24 UTC6h 10m
2026-06-20 BAW17R - Jun 20, 08:05 UTCJun 20, 14:59 UTC6h 55m
2026-06-19 BAW9E EWR → LHR Jun 19, 22:24 UTCJun 20, 04:24 UTC6h 0m
2026-06-19 BAW185 - Jun 19, 10:44 UTCJun 19, 17:59 UTC7h 15m
2026-06-19 BAW176A JFK → LHR Jun 19, 00:34 UTCJun 19, 06:39 UTC6h 5m
2026-06-18 BAW17R - Jun 18, 07:40 UTCJun 18, 14:40 UTC7h 0m
2026-06-16 BAW461 MAD → LHR Jun 16, 16:05 UTCJun 16, 18:15 UTC2h 10m
2026-06-16 BAW46EZ - Jun 16, 11:45 UTCJun 16, 13:25 UTC1h 40m
2026-06-15 BAW29G BOS → LHR Jun 15, 11:34 UTCJun 15, 17:20 UTC5h 45m
2026-06-14 BAW239 - Jun 14, 19:55 UTCJun 15, 02:20 UTC6h 25m
2026-06-14 BAW6AC ORD → LHR Jun 14, 06:05 UTCJun 14, 13:20 UTC7h 15m
2026-06-13 BAW7CP LHR → ORD Jun 13, 16:35 UTCJun 14, 00:30 UTC7h 55m
2026-06-12 BAW216 IAD → LHR Jun 12, 23:25 UTCJun 13, 06:05 UTC6h 39m

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

Mode-S 400685 frequently asked

What is Mode-S code 400685?
400685 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-VIIM.
Where is Mode-S 400685 registered?
Mode-S code 400685 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 400685 broadcasting right now?
No active broadcast right now. Last signal was 8h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 400685, octal 20003205, decimal 4,195,973.
What flights does 400685 operate?
Mode-S 400685 has broadcast 20 distinct callsigns, including BAW7TG, BAW23T, BAW216, BAW239, BAW7W.