Apparatus

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sensors Mode-S transponder

404E25

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-MURG · VANS RV-6

Hex
404E25
Octal
20047045
Decimal
4,214,309
Country
GB
Tail
G-MURG
Type
RV6
No current signal · last broadcast 6d ago
Flights observed
46
Distinct callsigns
1
Country
GB
Last broadcast
6d ago

Last known position

Most recent position reported by Mode-S 404E25.

Country allocation

The ICAO 24-bit address 404E25 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
GMURG - 46 2026-07-12

Recent flights last 46

DateFlightRouteTakeoffLandingDuration
2026-07-12 GMURG - Jul 12, 10:35 UTCJul 12, 11:55 UTC1h 20m
2026-07-10 GMURG - Jul 10, 09:35 UTCJul 10, 10:50 UTC1h 15m
2026-07-01 GMURG - Jul 1, 12:50 UTCJul 1, 13:10 UTC20m
2026-06-28 GMURG - Jun 28, 15:14 UTCJun 28, 16:09 UTC55m
2026-06-28 GMURG - Jun 28, 10:35 UTCJun 28, 11:14 UTC40m
2026-06-21 GMURG - Jun 21, 10:14 UTCJun 21, 10:49 UTC35m
2026-06-19 GMURG - Jun 19, 12:09 UTCJun 19, 12:44 UTC35m
2026-06-19 GMURG - Jun 19, 09:40 UTCJun 19, 10:09 UTC30m
2026-06-15 GMURG - Jun 15, 15:40 UTCJun 15, 16:24 UTC45m
2026-06-15 GMURG - Jun 15, 08:45 UTCJun 15, 09:40 UTC55m
2026-06-14 GMURG - Jun 14, 14:20 UTCJun 14, 14:30 UTC10m
2026-06-14 GMURG - Jun 14, 10:50 UTCJun 14, 11:05 UTC15m
2026-06-05 GMURG - Jun 5, 14:00 UTCJun 5, 14:40 UTC40m
2026-06-05 GMURG - Jun 5, 10:10 UTCJun 5, 10:50 UTC40m
2026-05-27 GMURG - May 27, 16:20 UTCMay 27, 16:55 UTC35m
2026-05-27 GMURG - May 27, 13:35 UTCMay 27, 15:15 UTC1h 40m
2026-05-27 GMURG - May 27, 10:40 UTCMay 27, 11:35 UTC55m
2026-05-26 GMURG - May 26, 17:55 UTCMay 26, 18:30 UTC35m
2026-05-26 GMURG - May 26, 10:29 UTCMay 26, 11:24 UTC55m
2026-05-24 GMURG - May 24, 15:40 UTCMay 24, 15:55 UTC15m
2026-05-24 GMURG - May 24, 14:40 UTCMay 24, 14:50 UTC10m
2026-05-24 GMURG - May 24, 10:40 UTCMay 24, 11:20 UTC40m
2026-05-23 GMURG - May 23, 15:10 UTCMay 23, 15:40 UTC30m
2026-05-23 GMURG - May 23, 10:55 UTCMay 23, 11:05 UTC10m
2026-05-22 GMURG - May 22, 12:55 UTCMay 22, 14:10 UTC1h 15m
2026-05-21 GMURG - May 21, 10:40 UTCMay 21, 11:35 UTC55m
2026-05-19 GMURG - May 19, 10:15 UTCMay 19, 11:30 UTC1h 15m
2026-05-17 GMURG - May 17, 10:35 UTCMay 17, 11:15 UTC40m
2026-05-17 GMURG - May 17, 08:40 UTCMay 17, 09:45 UTC1h 5m
2026-05-16 GMURG - May 16, 09:35 UTCMay 16, 10:40 UTC1h 5m
2026-05-15 GMURG - May 15, 14:50 UTCMay 15, 15:10 UTC20m
2026-05-15 GMURG - May 15, 13:05 UTCMay 15, 13:30 UTC25m
2026-05-15 GMURG - May 15, 10:35 UTCMay 15, 11:05 UTC30m
2026-05-09 GMURG - May 9, 14:35 UTCMay 9, 15:30 UTC55m
2026-05-09 GMURG - May 9, 10:20 UTCMay 9, 11:15 UTC55m
2026-05-08 GMURG - May 8, 12:49 UTCMay 8, 13:25 UTC35m
2026-05-08 GMURG - May 8, 09:04 UTCMay 8, 09:39 UTC35m
2026-05-03 GMURG - May 3, 14:20 UTCMay 3, 14:45 UTC25m
2026-05-03 GMURG - May 3, 11:55 UTCMay 3, 12:10 UTC15m
2026-04-26 GMURG - Apr 26, 14:20 UTCApr 26, 15:10 UTC50m
2026-04-26 GMURG - Apr 26, 10:05 UTCApr 26, 11:05 UTC1h 0m
2026-04-24 GMURG - Apr 24, 14:20 UTCApr 24, 15:00 UTC40m
2026-04-24 GMURG - Apr 24, 10:15 UTCApr 24, 10:55 UTC40m
2026-04-18 GMURG - Apr 18, 13:40 UTCApr 18, 14:10 UTC30m
2026-04-18 GMURG - Apr 18, 09:40 UTCApr 18, 10:10 UTC30m
2026-04-16 GMURG - Apr 16, 12:19 UTCApr 16, 13:05 UTC45m

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

Mode-S 404E25 frequently asked

What is Mode-S code 404E25?
404E25 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-MURG.
Where is Mode-S 404E25 registered?
Mode-S code 404E25 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 404E25 broadcasting right now?
No active broadcast right now. Last signal was 6d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 404E25, octal 20047045, decimal 4,214,309.
What flights does 404E25 operate?
Mode-S 404E25 has broadcast 1 distinct callsign, including GMURG.