Apparatus

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sensors Mode-S transponder

4081A4

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-KFCW · BEST OFF Nynja

Hex
4081A4
Octal
20100644
Decimal
4,227,492
Country
GB
Tail
G-KFCW
Type
NNJA
No current signal · last broadcast 1h ago
Flights observed
202
Distinct callsigns
1
Country
GB
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 4081A4.

Country allocation

The ICAO 24-bit address 4081A4 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
GKFCW - 202 2026-07-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 GKFCW GBA → GBA Jul 15, 14:25 UTCJul 15, 16:20 UTC1h 55m
2026-07-15 GKFCW GBA → GBA Jul 15, 11:10 UTCJul 15, 12:00 UTC50m
2026-07-15 GKFCW - Jul 15, 09:15 UTCJul 15, 10:05 UTC50m
2026-07-11 GKFCW - Jul 11, 19:00 UTCJul 11, 19:35 UTC35m
2026-07-11 GKFCW GBA → GBA Jul 11, 17:05 UTCJul 11, 17:50 UTC45m
2026-07-10 GKFCW - Jul 10, 11:30 UTCJul 10, 12:15 UTC45m
2026-07-10 GKFCW GBA → GBA Jul 10, 08:25 UTCJul 10, 09:20 UTC55m
2026-07-09 GKFCW GBA → GBA Jul 9, 17:10 UTCJul 9, 17:30 UTC20m
2026-07-09 GKFCW - Jul 9, 15:50 UTCJul 9, 16:30 UTC40m
2026-07-09 GKFCW - Jul 9, 13:50 UTCJul 9, 14:30 UTC40m
2026-07-09 GKFCW - Jul 9, 11:05 UTCJul 9, 11:50 UTC45m
2026-07-09 GKFCW GBA → GBA Jul 9, 08:50 UTCJul 9, 09:25 UTC35m
2026-07-08 GKFCW GBA → GBA Jul 8, 17:55 UTCJul 8, 18:30 UTC35m
2026-07-08 GKFCW GBA → GBA Jul 8, 15:55 UTCJul 8, 16:55 UTC1h 0m
2026-07-08 GKFCW GBA → GBA Jul 8, 09:30 UTCJul 8, 10:25 UTC55m
2026-07-08 GKFCW - Jul 8, 07:30 UTCJul 8, 07:45 UTC15m
2026-07-07 GKFCW GBA → GBA Jul 7, 19:10 UTCJul 7, 19:50 UTC40m
2026-07-07 GKFCW GBA → GBA Jul 7, 18:10 UTCJul 7, 18:40 UTC30m
2026-07-07 GKFCW GBA → GBA Jul 7, 15:15 UTCJul 7, 16:00 UTC45m
2026-07-07 GKFCW - Jul 7, 13:25 UTCJul 7, 14:10 UTC45m
2026-07-07 GKFCW GBA → GBA Jul 7, 10:45 UTCJul 7, 11:45 UTC1h 0m
2026-07-06 GKFCW - Jul 6, 15:55 UTCJul 6, 16:50 UTC55m
2026-07-06 GKFCW - Jul 6, 13:40 UTCJul 6, 15:00 UTC1h 20m
2026-07-06 GKFCW GBA → GBA Jul 6, 11:35 UTCJul 6, 12:30 UTC55m
2026-07-05 GKFCW - Jul 5, 16:45 UTCJul 5, 17:25 UTC40m
2026-07-04 GKFCW GBA → GBA Jul 4, 16:35 UTCJul 4, 17:15 UTC40m
2026-07-04 GKFCW - Jul 4, 10:00 UTCJul 4, 10:25 UTC25m
2026-07-04 GKFCW - Jul 4, 08:00 UTCJul 4, 08:25 UTC25m
2026-07-03 GKFCW GBA → GBA Jul 3, 14:40 UTCJul 3, 15:15 UTC35m
2026-07-03 GKFCW GBA → GBA Jul 3, 10:05 UTCJul 3, 10:55 UTC50m
2026-07-02 GKFCW - Jul 2, 15:10 UTCJul 2, 15:30 UTC20m
2026-07-02 GKFCW - Jul 2, 13:55 UTCJul 2, 14:10 UTC15m
2026-07-02 GKFCW - Jul 2, 12:05 UTCJul 2, 12:20 UTC15m
2026-07-02 GKFCW GBA → GBA Jul 2, 09:10 UTCJul 2, 09:55 UTC45m
2026-07-01 GKFCW GBA → GBA Jul 1, 18:40 UTCJul 1, 18:55 UTC15m
2026-07-01 GKFCW GBA → GBA Jul 1, 16:45 UTCJul 1, 18:05 UTC1h 20m
2026-07-01 GKFCW - Jul 1, 15:00 UTCJul 1, 15:55 UTC55m
2026-07-01 GKFCW - Jul 1, 12:05 UTCJul 1, 13:00 UTC55m
2026-07-01 GKFCW GBA → GBA Jul 1, 10:35 UTCJul 1, 10:55 UTC20m
2026-07-01 GKFCW GBA → GBA Jul 1, 07:55 UTCJul 1, 08:05 UTC10m
2026-06-30 GKFCW GBA → GBA Jun 30, 15:30 UTCJun 30, 15:50 UTC20m
2026-06-30 GKFCW - Jun 30, 09:50 UTCJun 30, 10:35 UTC45m
2026-06-30 GKFCW - Jun 30, 08:10 UTCJun 30, 08:45 UTC35m
2026-06-29 GKFCW - Jun 29, 19:05 UTCJun 29, 19:49 UTC45m
2026-06-29 GKFCW - Jun 29, 16:29 UTCJun 29, 18:19 UTC1h 50m
2026-06-29 GKFCW GBA → GBA Jun 29, 12:55 UTCJun 29, 13:54 UTC1h 0m
2026-06-29 GKFCW - Jun 29, 10:55 UTCJun 29, 11:50 UTC55m
2026-06-29 GKFCW - Jun 29, 08:54 UTCJun 29, 09:44 UTC50m
2026-06-28 GKFCW GBA → GBA Jun 28, 14:59 UTCJun 28, 15:55 UTC55m
2026-06-28 GKFCW GBA → GBA Jun 28, 14:14 UTCJun 28, 14:25 UTC10m

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

Mode-S 4081A4 frequently asked

What is Mode-S code 4081A4?
4081A4 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-KFCW.
Where is Mode-S 4081A4 registered?
Mode-S code 4081A4 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 4081A4 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 4081A4, octal 20100644, decimal 4,227,492.
What flights does 4081A4 operate?
Mode-S 4081A4 has broadcast 1 distinct callsign, including GKFCW.