Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

400684

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-VIIL · BOEING 777-200

Hex
400684
Octal
20003204
Decimal
4,195,972
Country
GB
Tail
G-VIIL
Type
B772
No current signal · last broadcast Jul 21, 23:55 UTC
Flights observed
189
Distinct callsigns
20
Country
GB
Last broadcast
Jul 21, 23:55 UTC

Last known position

Most recent position reported by Mode-S 400684.

Country allocation

The ICAO 24-bit address 400684 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
BAW7NY - 10 2026-07-07
BAW183 - 9 2026-06-15
BAW178 British Airways 9 2026-06-16
BAW7CP - 8 2026-07-08
BAW252N British Airways 8 2026-07-19
BAW176A - 8 2026-07-16
BAW6AC - 7 2026-07-09
BAW82 - 6 2026-06-14
BAW53M - 6 2026-07-18
BAW172 - 6 2026-07-08
BAW17R - 5 2026-07-15
BAW11J - 5 2026-06-18
BAW9E - 4 2026-06-29
BAW7W - 4 2026-07-17
BAW29G British Airways 4 2026-06-20
BAW255T - 4 2026-07-14
BAW239 - 4 2026-06-19
BAW22E British Airways 4 2026-07-21
BAW223N British Airways 4 2026-07-21
BAW216 British Airways 4 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-21 BAW223N LHR → BNA Jul 21, 15:10 UTCJul 21, 23:50 UTC8h 40m
2026-07-21 BAW22E BNA → LHR Jul 21, 10:00 UTCJul 21, 11:25 UTC1h 25m
2026-07-21 BAW22E BNA → LHR Jul 21, 03:45 UTCJul 21, 06:25 UTC2h 40m
2026-07-20 BAW223N LHR → BNA Jul 20, 16:55 UTCJul 21, 01:10 UTC8h 15m
2026-07-20 BAW23T ATL → LHR Jul 20, 03:40 UTCJul 20, 11:35 UTC7h 55m
2026-07-19 BAW7TG LHR → ATL Jul 19, 16:25 UTCJul 20, 00:45 UTC8h 20m
2026-07-19 BAW252N NAS → LHR Jul 19, 04:50 UTCJul 19, 10:35 UTC5h 45m
2026-07-18 BAW53M - Jul 18, 09:45 UTCJul 19, 09:00 UTC23h 15m
2026-07-17 BAW216 IAD → LHR Jul 17, 22:25 UTCJul 18, 05:20 UTC6h 56m
2026-07-17 BAW7W LHR → IAD Jul 17, 12:19 UTCJul 17, 19:40 UTC7h 20m
2026-07-16 BAW20R ORD → LHR Jul 16, 22:35 UTCJul 17, 05:50 UTC7h 15m
2026-07-16 BAW2PD LHR → ORD Jul 16, 10:45 UTCJul 16, 18:34 UTC7h 50m
2026-07-16 BAW176A JFK → LHR Jul 16, 00:30 UTCJul 16, 06:55 UTC6h 25m
2026-07-15 BAW17R - Jul 15, 07:45 UTCJul 15, 14:45 UTC7h 0m
2026-07-15 BAW25GP - Jul 15, 03:40 UTCJul 15, 05:05 UTC1h 25m
2026-07-14 BAW255T - Jul 14, 18:40 UTCJul 14, 18:55 UTC15m
2026-07-14 BAW255T - Jul 14, 11:05 UTCJul 14, 12:15 UTC1h 10m
2026-07-14 BAW176A - Jul 14, 00:10 UTCJul 14, 06:40 UTC6h 30m
2026-07-13 BAW17R - Jul 13, 07:45 UTCJul 13, 14:25 UTC6h 40m
2026-07-12 BAW120 - Jul 12, 01:45 UTCJul 12, 09:00 UTC7h 15m
2026-07-11 BAW21V - Jul 11, 15:10 UTCJul 11, 23:05 UTC7h 55m
2026-07-11 BAW22E BNA → LHR Jul 11, 01:50 UTCJul 11, 09:25 UTC7h 35m
2026-07-10 BAW223N LHR → BNA Jul 10, 14:45 UTCJul 10, 23:20 UTC8h 35m
2026-07-10 BAW22E - Jul 10, 02:05 UTCJul 10, 09:35 UTC7h 30m
2026-07-09 BAW223N - Jul 9, 14:50 UTCJul 9, 23:20 UTC8h 30m
2026-07-09 BAW6AC - Jul 9, 03:45 UTCJul 9, 11:05 UTC7h 20m
2026-07-08 BAW7CP - Jul 8, 15:15 UTCJul 8, 23:25 UTC8h 10m
2026-07-08 BAW172 JFK → LHR Jul 8, 01:25 UTCJul 8, 08:00 UTC6h 35m
2026-07-07 BAW7NY LHR → JFK Jul 7, 09:35 UTCJul 7, 16:35 UTC7h 0m
2026-07-06 BAW216 IAD → LHR Jul 6, 22:55 UTCJul 7, 05:25 UTC6h 30m
2026-07-06 BAW7W - Jul 6, 12:30 UTCJul 6, 20:05 UTC7h 35m
2026-07-06 BAW120 - Jul 6, 01:50 UTCJul 6, 09:00 UTC7h 10m
2026-07-05 BAW21V - Jul 5, 15:25 UTCJul 5, 23:20 UTC7h 55m
2026-07-05 BAW6AC ORD → LHR Jul 5, 04:10 UTCJul 5, 11:00 UTC6h 50m
2026-07-04 BAW7CP LHR → ORD Jul 4, 16:30 UTCJul 5, 00:55 UTC8h 25m
2026-07-04 BAW298 ORD → LHR Jul 4, 06:00 UTCJul 4, 13:05 UTC7h 5m
2026-07-02 BAW7CP LHR → ORD Jul 2, 14:50 UTCJul 2, 23:05 UTC8h 15m
2026-07-02 BAW172 JFK → LHR Jul 2, 01:40 UTCJul 2, 07:50 UTC6h 10m
2026-07-01 BAW7NY - Jul 1, 09:35 UTCJul 1, 16:40 UTC7h 5m
2026-07-01 BAW176A - Jul 1, 00:05 UTCJul 1, 06:15 UTC6h 10m
2026-06-30 BAW17R - Jun 30, 07:50 UTCJun 30, 14:40 UTC6h 50m
2026-06-29 BAW9E - Jun 29, 22:15 UTCJun 30, 04:20 UTC6h 6m
2026-06-29 BAW185 - Jun 29, 10:40 UTCJun 29, 17:49 UTC7h 10m
2026-06-28 BAW290 IAD → LHR Jun 28, 23:39 UTCJun 29, 06:09 UTC6h 30m
2026-06-28 BAW291 - Jun 28, 13:34 UTCJun 28, 20:59 UTC7h 25m
2026-06-28 BAW6AC ORD → LHR Jun 28, 03:59 UTCJun 28, 10:55 UTC6h 55m
2026-06-27 BAW7CP LHR → ORD Jun 27, 16:24 UTCJun 28, 00:15 UTC7h 50m
2026-06-27 BAW6AC - Jun 27, 03:25 UTCJun 27, 10:34 UTC7h 10m
2026-06-26 BAW7CP LHR → ORD Jun 26, 15:05 UTCJun 26, 22:55 UTC7h 50m
2026-06-26 BAW298 ORD → LHR Jun 26, 01:10 UTCJun 26, 08:15 UTC7h 5m

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

Mode-S 400684 frequently asked

What is Mode-S code 400684?
400684 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-VIIL.
Where is Mode-S 400684 registered?
Mode-S code 400684 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 400684 broadcasting right now?
No active broadcast right now. Last signal was Jul 21, 23:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 400684, octal 20003204, decimal 4,195,972.
What flights does 400684 operate?
Mode-S 400684 has broadcast 20 distinct callsigns, including BAW7NY, BAW183, BAW178, BAW7CP, BAW252N.