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
Broadcasting now · callsign BAW7TG · 38,000 ft
Flights observed
203
Distinct callsigns
20
Country
GB
Last broadcast
Jul 26, 20:05 UTC

Current position

400685 is currently broadcasting. Map zoomed to live position.

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 British Airways 16 2026-07-25
BAW23T British Airways 16 2026-07-26
BAW29G - 12 2026-07-18
BAW239 British Airways 11 2026-07-17
BAW216 - 11 2026-07-03
BAW183 British Airways 10 2026-07-26
BAW178 - 10 2026-07-16
BAW7W - 9 2026-07-03
BAW17R British Airways 8 2026-07-20
BAW176A British Airways 8 2026-07-21
BAW9E British Airways 6 2026-07-19
BAW82 - 6 2026-07-14
BAW7NY - 6 2026-07-02
BAW185 British Airways 6 2026-07-19
BAW172 - 6 2026-07-03
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
2026-07-26 BAW183 LHR → JFK Jul 26, 18:50 UTCJul 26, 20:05 UTC1h 15m
2026-07-26 BAW23T ATL → LHR Jul 26, 02:45 UTCJul 26, 10:00 UTC7h 16m
2026-07-25 BAW7TG LHR → ATL Jul 25, 15:45 UTCJul 26, 00:10 UTC8h 25m
2026-07-24 BAW9HL PHL → LHR Jul 24, 23:10 UTCJul 25, 05:25 UTC6h 15m
2026-07-24 BAW6RB LHR → PHL Jul 24, 13:15 UTCJul 24, 20:35 UTC7h 20m
2026-07-24 BAW98T YYZ → LHR Jul 24, 02:50 UTCJul 24, 09:20 UTC6h 30m
2026-07-23 BAW99 LHR → YYZ Jul 23, 17:35 UTCJul 24, 00:35 UTC7h 0m
2026-07-22 BAW18B BDA → LHR Jul 22, 14:30 UTCJul 23, 06:20 UTC15h 50m
2026-07-22 BAW6AC - Jul 22, 11:10 UTCJul 22, 11:30 UTC20m
2026-07-22 BAW6AC - Jul 22, 04:05 UTCJul 22, 10:25 UTC6h 20m
2026-07-21 BAW7CP - Jul 21, 15:15 UTCJul 21, 23:10 UTC7h 55m
2026-07-21 BAW176A JFK → LHR Jul 21, 00:35 UTCJul 21, 06:45 UTC6h 10m
2026-07-20 BAW17R LHR → JFK Jul 20, 07:45 UTCJul 20, 15:05 UTC7h 20m
2026-07-19 BAW9E EWR → LHR Jul 19, 22:15 UTCJul 20, 04:25 UTC6h 10m
2026-07-19 BAW185 LHR → EWR Jul 19, 10:40 UTCJul 19, 17:45 UTC7h 5m
2026-07-18 BAW29G - Jul 18, 13:00 UTCJul 18, 18:00 UTC5h 0m
2026-07-18 BAW29G - Jul 18, 11:45 UTCJul 18, 12:50 UTC1h 5m
2026-07-17 BAW239 LHR → BOS Jul 17, 19:49 UTCJul 18, 02:09 UTC6h 20m
2026-07-16 BAW178 JFK → LHR Jul 16, 12:49 UTCJul 16, 19:14 UTC6h 25m
2026-07-15 BAW183 - Jul 15, 18:55 UTCJul 16, 01:45 UTC6h 50m
2026-07-14 BAW82 - Jul 14, 23:00 UTCJul 15, 13:30 UTC14h 30m
2026-07-14 BAW83 - Jul 14, 22:30 UTCJul 14, 22:55 UTC24m
2026-07-14 BAW29G BOS → LHR Jul 14, 11:35 UTCJul 14, 17:50 UTC6h 15m
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

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?
Yes. Mode-S 400685 is currently airborne.
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, BAW29G, BAW239, BAW216.