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sensors Mode-S transponder

407E87

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-CMKJ · PIPER PA-28-140/150/160/180

Hex
407E87
Octal
20077207
Decimal
4,226,695
Country
GB
Tail
G-CMKJ
Type
P28A
No current signal · last broadcast Jul 26, 17:00 UTC
Flights observed
136
Distinct callsigns
1
Country
GB
Last broadcast
Jul 26, 17:00 UTC

Last known position

Most recent position reported by Mode-S 407E87.

Country allocation

The ICAO 24-bit address 407E87 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 1 distinct

Callsign Airline Flights Last seen
GCMKJ - 136 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 GCMKJ BBS → BBS Jul 26, 16:15 UTCJul 26, 17:00 UTC45m
2026-07-26 GCMKJ BBS → BBS Jul 26, 14:05 UTCJul 26, 14:35 UTC30m
2026-07-26 GCMKJ - Jul 26, 11:40 UTCJul 26, 12:15 UTC35m
2026-07-25 GCMKJ FAB → BBS Jul 25, 10:25 UTCJul 25, 11:20 UTC55m
2026-07-23 GCMKJ - Jul 23, 07:25 UTCJul 23, 08:20 UTC55m
2026-07-21 GCMKJ BBS → BBS Jul 21, 16:20 UTCJul 21, 17:05 UTC45m
2026-07-20 GCMKJ BBS → BBS Jul 20, 12:30 UTCJul 20, 13:30 UTC1h 0m
2026-07-20 GCMKJ - Jul 20, 10:55 UTCJul 20, 11:40 UTC45m
2026-07-20 GCMKJ - Jul 20, 09:35 UTCJul 20, 10:20 UTC45m
2026-07-18 GCMKJ - Jul 18, 11:40 UTCJul 18, 12:20 UTC40m
2026-07-18 GCMKJ - Jul 18, 09:50 UTCJul 18, 10:20 UTC30m
2026-07-18 GCMKJ - Jul 18, 08:00 UTCJul 18, 08:40 UTC40m
2026-07-17 GCMKJ - Jul 17, 11:50 UTCJul 17, 12:04 UTC15m
2026-07-17 GCMKJ - Jul 17, 10:20 UTCJul 17, 11:00 UTC40m
2026-07-17 GCMKJ - Jul 17, 08:10 UTCJul 17, 09:10 UTC1h 0m
2026-07-16 GCMKJ GBA → BBS Jul 16, 12:30 UTCJul 16, 13:10 UTC40m
2026-07-16 GCMKJ - Jul 16, 10:40 UTCJul 16, 11:15 UTC35m
2026-07-16 GCMKJ BBS → BBS Jul 16, 07:25 UTCJul 16, 07:45 UTC20m
2026-07-15 GCMKJ - Jul 15, 09:25 UTCJul 15, 10:05 UTC40m
2026-07-13 GCMKJ - Jul 13, 14:05 UTCJul 13, 15:05 UTC1h 0m
2026-07-13 GCMKJ BBS → BBS Jul 13, 11:25 UTCJul 13, 12:20 UTC55m
2026-07-11 GCMKJ NQY → BBS Jul 11, 11:30 UTCJul 11, 14:00 UTC2h 30m
2026-07-10 GCMKJ BBS → NQY Jul 10, 09:35 UTCJul 10, 11:25 UTC1h 50m
2026-07-08 GCMKJ BBS → BBS Jul 8, 13:50 UTCJul 8, 14:35 UTC45m
2026-07-08 GCMKJ - Jul 8, 11:10 UTCJul 8, 11:40 UTC30m
2026-07-08 GCMKJ - Jul 8, 09:10 UTCJul 8, 09:40 UTC30m
2026-07-07 GCMKJ - Jul 7, 12:30 UTCJul 7, 13:55 UTC1h 25m
2026-07-07 GCMKJ - Jul 7, 09:45 UTCJul 7, 11:20 UTC1h 35m
2026-07-06 GCMKJ BBS → BBS Jul 6, 13:45 UTCJul 6, 14:40 UTC55m
2026-07-06 GCMKJ BBS → BBS Jul 6, 10:15 UTCJul 6, 10:55 UTC40m
2026-07-05 GCMKJ BBS → BBS Jul 5, 12:10 UTCJul 5, 12:30 UTC20m
2026-07-04 GCMKJ - Jul 4, 14:40 UTCJul 4, 15:30 UTC50m
2026-07-03 GCMKJ - Jul 3, 13:45 UTCJul 3, 16:50 UTC3h 5m
2026-07-01 GCMKJ BBS → BBS Jul 1, 12:45 UTCJul 1, 13:35 UTC50m
2026-07-01 GCMKJ - Jul 1, 09:15 UTCJul 1, 10:05 UTC50m
2026-06-28 GCMKJ - Jun 28, 14:09 UTCJun 28, 16:05 UTC1h 55m
2026-06-28 GCMKJ - Jun 28, 10:19 UTCJun 28, 11:19 UTC1h 0m
2026-06-27 GCMKJ - Jun 27, 09:15 UTCJun 27, 09:44 UTC30m
2026-06-26 GCMKJ - Jun 26, 09:14 UTCJun 26, 09:55 UTC40m
2026-06-22 GCMKJ - Jun 22, 09:34 UTCJun 22, 10:15 UTC40m
2026-06-20 GCMKJ BBS → BBS Jun 20, 11:44 UTCJun 20, 12:34 UTC50m
2026-06-19 GCMKJ - Jun 19, 12:39 UTCJun 19, 13:09 UTC30m
2026-06-19 GCMKJ - Jun 19, 10:50 UTCJun 19, 11:24 UTC35m
2026-06-17 GCMKJ - Jun 17, 14:30 UTCJun 17, 15:05 UTC35m
2026-06-17 GCMKJ - Jun 17, 11:50 UTCJun 17, 12:40 UTC50m
2026-06-15 GCMKJ BBS → BBS Jun 15, 13:20 UTCJun 15, 14:00 UTC40m
2026-06-15 GCMKJ BBS → BBS Jun 15, 09:30 UTCJun 15, 11:19 UTC1h 50m
2026-06-15 GCMKJ - Jun 15, 07:25 UTCJun 15, 07:45 UTC20m
2026-06-14 GCMKJ - Jun 14, 15:40 UTCJun 14, 17:00 UTC1h 20m
2026-06-14 GCMKJ - Jun 14, 13:50 UTCJun 14, 14:55 UTC1h 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-CMKJ page for operator, model, and routing details .

Mode-S 407E87 frequently asked

What is Mode-S code 407E87?
407E87 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-CMKJ.
Where is Mode-S 407E87 registered?
Mode-S code 407E87 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 407E87 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 17:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 407E87, octal 20077207, decimal 4,226,695.
What flights does 407E87 operate?
Mode-S 407E87 has broadcast 1 distinct callsign, including GCMKJ.