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sensors Mode-S transponder

401709

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-AVMD · CESSNA 150

Hex
401709
Octal
20013411
Decimal
4,200,201
Country
GB
Tail
G-AVMD
Type
C150
No current signal · last broadcast Jul 25, 15:55 UTC
Flights observed
133
Distinct callsigns
1
Country
GB
Last broadcast
Jul 25, 15:55 UTC

Last known position

Most recent position reported by Mode-S 401709.

Country allocation

The ICAO 24-bit address 401709 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
GAVMD - 133 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 GAVMD - Jul 25, 15:35 UTCJul 25, 15:55 UTC20m
2026-07-25 GAVMD - Jul 25, 08:40 UTCJul 25, 09:10 UTC30m
2026-07-24 GAVMD - Jul 24, 16:00 UTCJul 24, 16:30 UTC30m
2026-07-24 GAVMD - Jul 24, 14:30 UTCJul 24, 14:55 UTC25m
2026-07-24 GAVMD - Jul 24, 10:50 UTCJul 24, 11:40 UTC50m
2026-07-24 GAVMD - Jul 24, 08:35 UTCJul 24, 09:30 UTC55m
2026-07-23 GAVMD - Jul 23, 11:20 UTCJul 23, 12:10 UTC50m
2026-07-22 GAVMD - Jul 22, 15:35 UTCJul 22, 16:20 UTC45m
2026-07-22 GAVMD - Jul 22, 12:45 UTCJul 22, 13:40 UTC55m
2026-07-22 GAVMD - Jul 22, 11:35 UTCJul 22, 11:45 UTC10m
2026-07-21 GAVMD - Jul 21, 13:00 UTCJul 21, 13:30 UTC30m
2026-07-21 GAVMD - Jul 21, 10:35 UTCJul 21, 11:05 UTC30m
2026-07-20 GAVMD - Jul 20, 12:20 UTCJul 20, 13:10 UTC50m
2026-07-20 GAVMD - Jul 20, 10:10 UTCJul 20, 10:55 UTC45m
2026-07-19 GAVMD - Jul 19, 15:55 UTCJul 19, 16:05 UTC10m
2026-07-19 GAVMD - Jul 19, 14:25 UTCJul 19, 15:10 UTC45m
2026-07-18 GAVMD - Jul 18, 10:20 UTCJul 18, 11:05 UTC45m
2026-07-17 GAVMD - Jul 17, 10:55 UTCJul 17, 11:50 UTC55m
2026-07-16 GAVMD - Jul 16, 08:50 UTCJul 16, 09:35 UTC45m
2026-07-14 GAVMD - Jul 14, 14:20 UTCJul 14, 14:55 UTC35m
2026-07-14 GAVMD - Jul 14, 12:15 UTCJul 14, 12:45 UTC30m
2026-07-14 GAVMD - Jul 14, 10:15 UTCJul 14, 11:10 UTC55m
2026-07-14 GAVMD - Jul 14, 09:00 UTCJul 14, 09:35 UTC35m
2026-07-13 GAVMD - Jul 13, 10:00 UTCJul 13, 10:40 UTC40m
2026-07-12 GAVMD - Jul 12, 16:15 UTCJul 12, 17:01 UTC45m
2026-07-12 GAVMD - Jul 12, 14:20 UTCJul 12, 15:01 UTC40m
2026-07-12 GAVMD - Jul 12, 12:25 UTCJul 12, 13:30 UTC1h 5m
2026-07-10 GAVMD - Jul 10, 15:05 UTCJul 10, 15:50 UTC45m
2026-07-10 GAVMD - Jul 10, 10:10 UTCJul 10, 10:55 UTC45m
2026-07-09 GAVMD - Jul 9, 14:25 UTCJul 9, 15:05 UTC40m
2026-07-09 GAVMD - Jul 9, 12:35 UTCJul 9, 13:10 UTC35m
2026-07-09 GAVMD - Jul 9, 10:45 UTCJul 9, 11:30 UTC45m
2026-07-08 GAVMD - Jul 8, 16:50 UTCJul 8, 17:10 UTC20m
2026-07-07 GAVMD - Jul 7, 11:45 UTCJul 7, 12:20 UTC35m
2026-07-06 GAVMD - Jul 6, 14:10 UTCJul 6, 15:05 UTC55m
2026-07-06 GAVMD - Jul 6, 12:30 UTCJul 6, 13:25 UTC55m
2026-07-06 GAVMD - Jul 6, 10:25 UTCJul 6, 11:20 UTC55m
2026-07-05 GAVMD - Jul 5, 12:35 UTCJul 5, 13:10 UTC35m
2026-07-03 GAVMD - Jul 3, 12:25 UTCJul 3, 13:10 UTC45m
2026-07-03 GAVMD - Jul 3, 10:30 UTCJul 3, 11:00 UTC30m
2026-07-01 GAVMD - Jul 1, 15:50 UTCJul 1, 16:40 UTC50m
2026-07-01 GAVMD - Jul 1, 14:25 UTCJul 1, 15:05 UTC40m
2026-07-01 GAVMD - Jul 1, 13:10 UTCJul 1, 13:50 UTC40m
2026-07-01 GAVMD - Jul 1, 11:05 UTCJul 1, 11:45 UTC40m
2026-06-30 GAVMD - Jun 30, 12:30 UTCJun 30, 13:15 UTC45m
2026-06-30 GAVMD - Jun 30, 10:20 UTCJun 30, 11:05 UTC45m
2026-06-29 GAVMD - Jun 29, 14:09 UTCJun 29, 15:14 UTC1h 5m
2026-06-29 GAVMD - Jun 29, 12:39 UTCJun 29, 13:24 UTC45m
2026-06-29 GAVMD - Jun 29, 10:59 UTCJun 29, 11:35 UTC35m
2026-06-29 GAVMD - Jun 29, 09:14 UTCJun 29, 09:44 UTC30m

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

Mode-S 401709 frequently asked

What is Mode-S code 401709?
401709 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-AVMD.
Where is Mode-S 401709 registered?
Mode-S code 401709 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 401709 broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 15:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 401709, octal 20013411, decimal 4,200,201.
What flights does 401709 operate?
Mode-S 401709 has broadcast 1 distinct callsign, including GAVMD.