Apparatus

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sensors Mode-S transponder

4081BA

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-PCTF · PILATUS PC-24

Hex
4081BA
Octal
20100672
Decimal
4,227,514
Country
GB
Tail
G-PCTF
Type
PC24
No current signal · last broadcast 1d ago
Flights observed
72
Distinct callsigns
2
Country
GB
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 4081BA.

Country allocation

The ICAO 24-bit address 4081BA 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 2 distinct

Callsign Airline Flights Last seen
LJC5 - 67 2026-07-13
GPCTF - 5 2026-05-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 LJC5 - Jul 13, 17:45 UTCJul 13, 18:35 UTC50m
2026-07-13 LJC5 - Jul 13, 15:05 UTCJul 13, 16:55 UTC1h 50m
2026-07-13 LJC5 - Jul 13, 11:15 UTCJul 13, 13:45 UTC2h 30m
2026-07-13 LJC5 - Jul 13, 05:20 UTCJul 13, 06:15 UTC55m
2026-07-10 LJC5 - Jul 10, 10:00 UTCJul 10, 11:00 UTC1h 0m
2026-07-10 LJC5 - Jul 10, 08:05 UTCJul 10, 09:05 UTC1h 0m
2026-07-09 LJC5 - Jul 9, 11:50 UTCJul 9, 12:50 UTC1h 0m
2026-07-09 LJC5 - Jul 9, 10:00 UTCJul 9, 11:00 UTC1h 0m
2026-07-08 LJC5 - Jul 8, 11:30 UTCJul 8, 12:30 UTC1h 0m
2026-07-08 LJC5 - Jul 8, 09:15 UTCJul 8, 11:00 UTC1h 45m
2026-07-03 LJC5 - Jul 3, 12:45 UTCJul 3, 15:05 UTC2h 20m
2026-07-03 LJC5 - Jul 3, 06:05 UTCJul 3, 07:10 UTC1h 5m
2026-07-02 LJC5 - Jul 2, 14:55 UTCJul 2, 15:50 UTC55m
2026-06-29 LJC5 - Jun 29, 09:29 UTCJun 29, 10:29 UTC1h 0m
2026-06-29 LJC5 - Jun 29, 07:34 UTCJun 29, 08:29 UTC55m
2026-06-28 LJC5 - Jun 28, 08:29 UTCJun 28, 10:50 UTC2h 20m
2026-06-27 LJC5 - Jun 27, 16:35 UTCJun 27, 18:35 UTC2h 0m
2026-06-27 LJC5 - Jun 27, 14:09 UTCJun 27, 15:10 UTC1h 0m
2026-06-25 LJC5 - Jun 25, 09:10 UTCJun 25, 10:04 UTC55m
2026-06-25 LJC5 - Jun 25, 07:39 UTCJun 25, 08:34 UTC55m
2026-06-21 LJC5 - Jun 21, 13:15 UTCJun 21, 14:10 UTC55m
2026-06-21 LJC5 LGG → GCI Jun 21, 11:10 UTCJun 21, 12:19 UTC1h 10m
2026-06-21 LJC5 - Jun 21, 08:30 UTCJun 21, 09:24 UTC55m
2026-06-20 LJC5 - Jun 20, 12:45 UTCJun 20, 13:44 UTC1h 0m
2026-06-20 LJC5 GCI → JER Jun 20, 11:49 UTCJun 20, 12:14 UTC25m
2026-06-20 LJC5 - Jun 20, 10:04 UTCJun 20, 11:05 UTC1h 0m
2026-06-18 LJC5 - Jun 18, 15:40 UTCJun 18, 16:50 UTC1h 10m
2026-06-18 LJC5 - Jun 18, 13:10 UTCJun 18, 14:10 UTC1h 0m
2026-06-17 LJC5 - Jun 17, 14:05 UTCJun 17, 15:05 UTC1h 0m
2026-06-15 LJC5 - Jun 15, 16:04 UTCJun 15, 16:30 UTC25m
2026-06-15 LJC5 - Jun 15, 14:30 UTCJun 15, 15:10 UTC40m
2026-06-15 LJC5 - Jun 15, 13:00 UTCJun 15, 13:54 UTC55m
2026-06-10 LJC5 - Jun 10, 14:10 UTCJun 10, 16:30 UTC2h 20m
2026-06-09 LJC5 - Jun 9, 10:25 UTCJun 9, 12:05 UTC1h 40m
2026-06-09 LJC5 - Jun 9, 09:15 UTCJun 9, 09:55 UTC40m
2026-06-09 LJC5 - Jun 9, 07:40 UTCJun 9, 08:10 UTC30m
2026-05-31 LJC5 - May 31, 15:30 UTCMay 31, 16:40 UTC1h 10m
2026-05-31 LJC5 - May 31, 13:25 UTCMay 31, 15:05 UTC1h 40m
2026-05-27 LJC5 - May 27, 11:00 UTCMay 27, 12:25 UTC1h 25m
2026-05-20 GPCTF - May 20, 15:30 UTCMay 20, 17:30 UTC2h 0m
2026-05-20 GPCTF - May 20, 13:40 UTCMay 20, 14:35 UTC55m
2026-05-18 GPCTF - May 18, 09:35 UTCMay 18, 10:30 UTC55m
2026-05-18 GPCTF - May 18, 07:40 UTCMay 18, 08:30 UTC50m
2026-05-15 LJC5 - May 15, 12:50 UTCMay 15, 13:00 UTC10m
2026-05-15 LJC5 - May 15, 11:10 UTCMay 15, 12:05 UTC55m
2026-05-15 LJC5 - May 15, 09:00 UTCMay 15, 09:55 UTC55m
2026-05-10 GPCTF - May 10, 08:05 UTCMay 10, 09:05 UTC1h 0m
2026-05-10 LJC5 - May 10, 06:04 UTCMay 10, 06:59 UTC55m
2026-05-06 LJC5 - May 6, 11:55 UTCMay 6, 12:30 UTC35m
2026-05-06 LJC5 - May 6, 10:10 UTCMay 6, 10:45 UTC35m

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

Mode-S 4081BA frequently asked

What is Mode-S code 4081BA?
4081BA is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-PCTF.
Where is Mode-S 4081BA registered?
Mode-S code 4081BA 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 4081BA broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4081BA, octal 20100672, decimal 4,227,514.
What flights does 4081BA operate?
Mode-S 4081BA has broadcast 2 distinct callsigns, including LJC5, GPCTF.