Apparatus

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sensors Mode-S transponder

4005C1

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-RAES · BOEING 777-200

Hex
4005C1
Octal
20002701
Decimal
4,195,777
Country
GB
Tail
G-RAES
Type
B772
No current signal · last broadcast 1h ago
Flights observed
100
Distinct callsigns
20
Country
GB
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 4005C1.

Country allocation

The ICAO 24-bit address 4005C1 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
BAW9E British Airways 10 2026-05-06
BAW185 British Airways 7 2026-05-06
BAW7W British Airways 6 2026-05-25
BAW216 British Airways 6 2026-05-25
BAW183 British Airways 6 2026-05-13
BAW178 British Airways 6 2026-05-14
BAW252N British Airways 5 2026-05-19
BAW255T British Airways 4 2026-04-30
BAW17R British Airways 4 2026-05-24
BAW176A British Airways 4 2026-05-25
BAW7NY British Airways 3 2026-05-29
BAW172 British Airways 3 2026-05-30
BAW53M British Airways 2 2026-05-19
BAW51B British Airways 2 2026-05-16
BAW50G British Airways 2 2026-05-15
BAW29G British Airways 2 2026-05-23
BAW239 British Airways 2 2026-05-22
BAW21V British Airways 2 2026-05-02
BAW120 British Airways 2 2026-05-03
BAW99 British Airways 1 2026-05-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 BAW172 JFK → LHR May 30, 01:50 UTCMay 30, 02:15 UTC25m
2026-05-29 BAW7NY LHR → JFK May 29, 09:50 UTCMay 29, 16:35 UTC6h 45m
2026-05-28 BAW40F JFK → LHR May 28, 23:15 UTCMay 29, 05:40 UTC6h 25m
2026-05-28 BAW173A LHR → JFK May 28, 11:15 UTCMay 28, 18:05 UTC6h 50m
2026-05-28 BAW298 ORD → LHR May 28, 00:25 UTCMay 28, 07:45 UTC7h 20m
2026-05-27 BAW299 LHR → ORD May 27, 12:55 UTCMay 27, 20:45 UTC7h 50m
2026-05-27 BAW172 JFK → LHR May 27, 01:19 UTCMay 27, 07:50 UTC6h 31m
2026-05-26 BAW7NY LHR → JFK May 26, 09:49 UTCMay 26, 16:40 UTC6h 50m
2026-05-25 BAW216 IAD → LHR May 25, 22:15 UTCMay 26, 05:10 UTC6h 55m
2026-05-25 BAW7W LHR → IAD May 25, 12:05 UTCMay 25, 19:35 UTC7h 30m
2026-05-25 BAW176A JFK → LHR May 25, 05:05 UTCMay 25, 06:40 UTC1h 35m
2026-05-24 BAW17R LHR → JFK May 24, 07:45 UTCMay 24, 14:45 UTC7h 0m
2026-05-23 BAW29G BOS → LHR May 23, 11:40 UTCMay 23, 17:30 UTC5h 50m
2026-05-22 BAW239 LHR → BOS May 22, 19:35 UTCMay 23, 02:00 UTC6h 25m
2026-05-22 BAW9603 ORD → LHR May 22, 07:55 UTCMay 22, 15:00 UTC7h 5m
2026-05-20 BAW7TG LHR → ATL May 20, 15:50 UTCMay 21, 00:25 UTC8h 35m
2026-05-19 BAW252N NAS → LHR May 19, 16:25 UTCMay 20, 10:25 UTC18h 1m
2026-05-19 BAW252N NAS → LHR May 19, 16:00 UTCMay 20, 10:25 UTC18h 26m
2026-05-19 BAW252N NAS → LHR May 19, 10:20 UTCMay 20, 10:15 UTC23h 56m
2026-05-19 BAW53M LHR → NAS May 19, 09:55 UTCMay 20, 04:05 UTC18h 10m
2026-05-18 BAW29G BOS → LHR May 18, 11:40 UTCMay 18, 17:35 UTC5h 55m
2026-05-17 BAW239 LHR → BOS May 17, 20:45 UTCMay 18, 03:15 UTC6h 30m
2026-05-16 BAW51B BOS → LHR May 16, 02:25 UTCMay 16, 08:20 UTC5h 56m
2026-05-15 BAW50G LHR → BOS May 15, 17:35 UTCMay 16, 00:10 UTC6h 35m
2026-05-14 BAW82 ABV → LHR May 14, 22:15 UTCMay 15, 13:00 UTC14h 45m
2026-05-14 BAW178 JFK → LHR May 14, 12:05 UTCMay 14, 18:45 UTC6h 40m
2026-05-13 BAW183 LHR → JFK May 13, 20:55 UTCMay 14, 03:55 UTC7h 0m
2026-05-13 BAW176A JFK → LHR May 13, 00:05 UTCMay 13, 06:35 UTC6h 30m
2026-05-12 BAW17R LHR → JFK May 12, 07:35 UTCMay 12, 14:45 UTC7h 10m
2026-05-11 BAW178 JFK → LHR May 11, 12:00 UTCMay 11, 18:15 UTC6h 15m
2026-05-10 BAW183 LHR → JFK May 10, 19:05 UTCMay 11, 02:15 UTC7h 10m
2026-05-10 BAW6AC ORD → LHR May 10, 02:34 UTCMay 10, 09:50 UTC7h 15m
2026-05-09 BAW7CP LHR → ORD May 9, 14:55 UTCMay 9, 23:00 UTC8h 5m
2026-05-09 BAW51B BOS → LHR May 9, 02:15 UTCMay 9, 08:30 UTC6h 15m
2026-05-08 BAW50G LHR → BOS May 8, 17:15 UTCMay 8, 23:45 UTC6h 30m
2026-05-08 BAW98T YYZ → LHR May 8, 02:19 UTCMay 8, 08:44 UTC6h 25m
2026-05-07 BAW99 LHR → YYZ May 7, 16:45 UTCMay 8, 00:14 UTC7h 29m
2026-05-06 BAW9E EWR → LHR May 6, 22:00 UTCMay 7, 04:25 UTC6h 25m
2026-05-06 BAW185 LHR → EWR May 6, 10:25 UTCMay 6, 17:50 UTC7h 25m
2026-05-05 BAW11J JFK → LHR May 5, 23:15 UTCMay 6, 05:45 UTC6h 30m
2026-05-05 BAW181 LHR → EWR May 5, 12:10 UTCMay 5, 19:05 UTC6h 55m
2026-05-05 BAW14K JFK → LHR May 5, 02:10 UTCMay 5, 08:35 UTC6h 25m
2026-05-04 BAW33K LHR → JFK May 4, 16:25 UTCMay 4, 23:20 UTC6h 56m
2026-05-03 BAW120 CVG → LHR May 3, 01:10 UTCMay 3, 08:35 UTC7h 24m
2026-05-02 BAW21V LHR → CVG May 2, 14:55 UTCMay 2, 23:00 UTC8h 5m
2026-05-01 BAW25GP BGI → LHR May 1, 01:20 UTCMay 1, 04:20 UTC3h 0m
2026-04-30 BAW255T LHR → BGI Apr 30, 18:25 UTCApr 30, 18:40 UTC15m
2026-04-30 BAW255T LHR → BGI Apr 30, 10:25 UTCApr 30, 11:35 UTC1h 10m
2026-04-30 BAW18B BDA → LHR Apr 30, 04:20 UTCApr 30, 05:45 UTC1h 25m
2026-04-29 BAW19N LHR → BDA Apr 29, 14:10 UTCApr 29, 15:20 UTC1h 10m

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

Mode-S 4005C1 frequently asked

What is Mode-S code 4005C1?
4005C1 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-RAES.
Where is Mode-S 4005C1 registered?
Mode-S code 4005C1 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 4005C1 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4005C1, octal 20002701, decimal 4,195,777.
What flights does 4005C1 operate?
Mode-S 4005C1 has broadcast 20 distinct callsigns, including BAW9E, BAW185, BAW7W, BAW216, BAW183.