Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

407F81

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-FSKY

Hex
407F81
Octal
20077601
Decimal
4,226,945
Country
GB
Tail
G-FSKY
Type
NNJA
No current signal · last broadcast 23h ago
Flights observed
114
Distinct callsigns
1
Country
GB
Last broadcast
23h ago

Last known position

Most recent position reported by Mode-S 407F81.

Country allocation

The ICAO 24-bit address 407F81 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
GFSKY - 114 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 GFSKY - Jul 13, 11:25 UTCJul 13, 11:45 UTC20m
2026-07-12 GFSKY - Jul 12, 14:40 UTCJul 12, 15:10 UTC30m
2026-07-12 GFSKY - Jul 12, 13:25 UTCJul 12, 13:45 UTC20m
2026-07-12 GFSKY - Jul 12, 12:05 UTCJul 12, 12:30 UTC25m
2026-07-12 GFSKY PSL → PSL Jul 12, 09:20 UTCJul 12, 09:50 UTC30m
2026-07-11 GFSKY - Jul 11, 15:25 UTCJul 11, 15:50 UTC25m
2026-07-10 GFSKY - Jul 10, 09:55 UTCJul 10, 10:45 UTC50m
2026-07-09 GFSKY PSL → PSL Jul 9, 16:30 UTCJul 9, 17:25 UTC55m
2026-07-09 GFSKY PSL → PSL Jul 9, 12:45 UTCJul 9, 13:30 UTC45m
2026-07-08 GFSKY PSL → PSL Jul 8, 19:10 UTCJul 8, 19:25 UTC15m
2026-07-08 GFSKY PSL → PSL Jul 8, 17:20 UTCJul 8, 18:10 UTC50m
2026-07-08 GFSKY - Jul 8, 08:00 UTCJul 8, 08:55 UTC55m
2026-07-07 GFSKY - Jul 7, 10:10 UTCJul 7, 11:00 UTC50m
2026-07-05 GFSKY - Jul 5, 12:15 UTCJul 5, 12:40 UTC25m
2026-07-05 GFSKY - Jul 5, 10:05 UTCJul 5, 10:50 UTC45m
2026-07-04 GFSKY - Jul 4, 13:40 UTCJul 4, 14:30 UTC50m
2026-07-04 GFSKY - Jul 4, 12:05 UTCJul 4, 12:55 UTC50m
2026-07-04 GFSKY - Jul 4, 10:00 UTCJul 4, 10:50 UTC50m
2026-07-03 GFSKY - Jul 3, 14:50 UTCJul 3, 15:10 UTC20m
2026-07-03 GFSKY PSL → PSL Jul 3, 09:55 UTCJul 3, 10:20 UTC25m
2026-07-01 GFSKY PSL → PSL Jul 1, 10:25 UTCJul 1, 11:10 UTC45m
2026-07-01 GFSKY PSL → PSL Jul 1, 08:25 UTCJul 1, 09:15 UTC50m
2026-06-29 GFSKY PSL → PSL Jun 29, 11:14 UTCJun 29, 12:00 UTC45m
2026-06-29 GFSKY - Jun 29, 09:10 UTCJun 29, 09:29 UTC20m
2026-06-28 GFSKY - Jun 28, 13:29 UTCJun 28, 14:25 UTC55m
2026-06-28 GFSKY PSL → PSL Jun 28, 09:34 UTCJun 28, 10:30 UTC55m
2026-06-27 GFSKY PSL → PSL Jun 27, 09:50 UTCJun 27, 10:40 UTC50m
2026-06-24 GFSKY PSL → PSL Jun 24, 16:54 UTCJun 24, 17:40 UTC45m
2026-06-23 GFSKY - Jun 23, 15:15 UTCJun 23, 16:09 UTC55m
2026-06-23 GFSKY PSL → PSL Jun 23, 11:45 UTCJun 23, 12:40 UTC55m
2026-06-21 GFSKY - Jun 21, 14:34 UTCJun 21, 15:05 UTC30m
2026-06-21 GFSKY - Jun 21, 13:24 UTCJun 21, 13:50 UTC25m
2026-06-21 GFSKY PSL → PSL Jun 21, 11:44 UTCJun 21, 12:44 UTC1h 0m
2026-06-20 GFSKY - Jun 20, 10:34 UTCJun 20, 11:25 UTC50m
2026-06-18 GFSKY - Jun 18, 11:50 UTCJun 18, 12:40 UTC50m
2026-06-18 GFSKY - Jun 18, 10:00 UTCJun 18, 10:45 UTC45m
2026-06-17 GFSKY PSL → PSL Jun 17, 12:30 UTCJun 17, 13:15 UTC45m
2026-06-17 GFSKY - Jun 17, 10:45 UTCJun 17, 11:35 UTC50m
2026-06-16 GFSKY PSL → PSL Jun 16, 12:35 UTCJun 16, 13:04 UTC30m
2026-06-15 GFSKY PSL → PSL Jun 15, 16:19 UTCJun 15, 17:04 UTC45m
2026-06-15 GFSKY - Jun 15, 12:30 UTCJun 15, 13:25 UTC55m
2026-06-15 GFSKY - Jun 15, 09:35 UTCJun 15, 10:30 UTC55m
2026-06-14 GFSKY PSL → PSL Jun 14, 14:35 UTCJun 14, 15:25 UTC50m
2026-06-14 GFSKY - Jun 14, 11:50 UTCJun 14, 12:30 UTC40m
2026-06-14 GFSKY - Jun 14, 10:15 UTCJun 14, 11:05 UTC50m
2026-06-08 GFSKY PSL → PSL Jun 8, 12:05 UTCJun 8, 12:25 UTC20m
2026-06-07 GFSKY PSL → PSL Jun 7, 13:35 UTCJun 7, 14:15 UTC40m
2026-06-07 GFSKY - Jun 7, 10:30 UTCJun 7, 11:20 UTC50m
2026-06-06 GFSKY PSL → PSL Jun 6, 15:05 UTCJun 6, 15:59 UTC55m
2026-06-06 GFSKY PSL → PSL Jun 6, 13:09 UTCJun 6, 13:34 UTC25m

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

Mode-S 407F81 frequently asked

What is Mode-S code 407F81?
407F81 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-FSKY.
Where is Mode-S 407F81 registered?
Mode-S code 407F81 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 407F81 broadcasting right now?
No active broadcast right now. Last signal was 23h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 407F81, octal 20077601, decimal 4,226,945.
What flights does 407F81 operate?
Mode-S 407F81 has broadcast 1 distinct callsign, including GFSKY.