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sensors Mode-S transponder

407FFE

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-SRXX · CIRRUS SR-20

Hex
407FFE
Octal
20077776
Decimal
4,227,070
Country
GB
Tail
G-SRXX
Type
SR20
No current signal · last broadcast Jul 25, 14:40 UTC
Flights observed
86
Distinct callsigns
1
Country
GB
Last broadcast
Jul 25, 14:40 UTC

Last known position

Most recent position reported by Mode-S 407FFE.

Country allocation

The ICAO 24-bit address 407FFE 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
GSRXX - 86 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 GSRXX - Jul 25, 13:55 UTCJul 25, 14:40 UTC45m
2026-07-25 GSRXX - Jul 25, 11:05 UTCJul 25, 12:25 UTC1h 20m
2026-07-24 GSRXX - Jul 24, 15:20 UTCJul 24, 16:05 UTC45m
2026-07-24 GSRXX JER → GBA Jul 24, 13:10 UTCJul 24, 14:25 UTC1h 15m
2026-07-24 GSRXX BQH → JER Jul 24, 10:40 UTCJul 24, 11:55 UTC1h 15m
2026-07-23 GSRXX - Jul 23, 13:30 UTCJul 23, 14:50 UTC1h 20m
2026-07-23 GSRXX - Jul 23, 10:15 UTCJul 23, 11:50 UTC1h 35m
2026-07-21 GSRXX - Jul 21, 13:25 UTCJul 21, 14:40 UTC1h 15m
2026-07-21 GSRXX - Jul 21, 09:40 UTCJul 21, 10:35 UTC55m
2026-07-20 GSRXX - Jul 20, 13:30 UTCJul 20, 14:50 UTC1h 20m
2026-07-20 GSRXX - Jul 20, 10:10 UTCJul 20, 11:20 UTC1h 10m
2026-07-18 GSRXX - Jul 18, 16:10 UTCJul 18, 17:10 UTC1h 0m
2026-07-16 GSRXX - Jul 16, 15:45 UTCJul 16, 16:30 UTC45m
2026-07-16 GSRXX - Jul 16, 14:20 UTCJul 16, 15:10 UTC50m
2026-07-16 GSRXX BQH → BQH Jul 16, 08:10 UTCJul 16, 09:15 UTC1h 5m
2026-07-15 GSRXX - Jul 15, 13:40 UTCJul 15, 15:40 UTC2h 0m
2026-07-14 GSRXX BQH → BQH Jul 14, 13:30 UTCJul 14, 14:50 UTC1h 20m
2026-07-14 GSRXX BQH → BQH Jul 14, 10:35 UTCJul 14, 11:35 UTC1h 0m
2026-07-13 GSRXX - Jul 13, 13:40 UTCJul 13, 15:20 UTC1h 40m
2026-07-09 GSRXX - Jul 9, 12:45 UTCJul 9, 13:35 UTC50m
2026-07-09 GSRXX - Jul 9, 10:15 UTCJul 9, 11:55 UTC1h 40m
2026-07-09 GSRXX - Jul 9, 08:15 UTCJul 9, 09:05 UTC50m
2026-07-08 GSRXX - Jul 8, 14:10 UTCJul 8, 14:55 UTC45m
2026-07-08 GSRXX - Jul 8, 09:00 UTCJul 8, 09:35 UTC35m
2026-07-07 GSRXX - Jul 7, 12:30 UTCJul 7, 13:00 UTC30m
2026-07-07 GSRXX - Jul 7, 10:00 UTCJul 7, 11:30 UTC1h 30m
2026-07-06 GSRXX - Jul 6, 14:15 UTCJul 6, 15:45 UTC1h 30m
2026-07-05 GSRXX - Jul 5, 13:20 UTCJul 5, 16:00 UTC2h 40m
2026-07-04 GSRXX ORM → BQH Jul 4, 14:55 UTCJul 4, 16:00 UTC1h 5m
2026-07-04 GSRXX - Jul 4, 11:20 UTCJul 4, 13:30 UTC2h 10m
2026-06-28 GSRXX - Jun 28, 10:10 UTCJun 28, 11:39 UTC1h 30m
2026-06-25 GSRXX GCI → BQH Jun 25, 17:44 UTCJun 25, 18:59 UTC1h 15m
2026-05-26 GSRXX - May 26, 14:00 UTCMay 26, 15:14 UTC1h 15m
2026-05-24 GSRXX - May 24, 16:40 UTCMay 24, 17:30 UTC50m
2026-05-24 GSRXX - May 24, 14:25 UTCMay 24, 15:15 UTC50m
2026-05-24 GSRXX NWI → LYX May 24, 12:00 UTCMay 24, 13:10 UTC1h 10m
2026-05-24 GSRXX - May 24, 09:05 UTCMay 24, 09:40 UTC35m
2026-05-23 GSRXX - May 23, 15:00 UTCMay 23, 15:45 UTC45m
2026-05-23 GSRXX - May 23, 12:45 UTCMay 23, 13:00 UTC15m
2026-05-23 GSRXX - May 23, 10:50 UTCMay 23, 11:25 UTC35m
2026-05-23 GSRXX - May 23, 08:55 UTCMay 23, 09:40 UTC45m
2026-05-22 GSRXX LYX → BQH May 22, 14:10 UTCMay 22, 14:45 UTC35m
2026-05-22 GSRXX - May 22, 10:35 UTCMay 22, 12:25 UTC1h 50m
2026-05-22 GSRXX - May 22, 08:35 UTCMay 22, 09:15 UTC40m
2026-05-21 GSRXX SEN → BQH May 21, 16:10 UTCMay 21, 16:25 UTC15m
2026-05-21 GSRXX - May 21, 15:10 UTCMay 21, 15:25 UTC15m
2026-05-21 GSRXX - May 21, 13:05 UTCMay 21, 13:55 UTC50m
2026-05-21 GSRXX - May 21, 11:05 UTCMay 21, 11:50 UTC45m
2026-05-21 GSRXX JER → BQH May 21, 09:00 UTCMay 21, 10:15 UTC1h 15m
2026-05-20 GSRXX - May 20, 06:10 UTCMay 20, 07:45 UTC1h 35m

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

Mode-S 407FFE frequently asked

What is Mode-S code 407FFE?
407FFE is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-SRXX.
Where is Mode-S 407FFE registered?
Mode-S code 407FFE 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 407FFE broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 14:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 407FFE, octal 20077776, decimal 4,227,070.
What flights does 407FFE operate?
Mode-S 407FFE has broadcast 1 distinct callsign, including GSRXX.