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sensors Mode-S transponder

401D8F

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-BGGO · CESSNA 152

Hex
401D8F
Octal
20016617
Decimal
4,201,871
Country
GB
Tail
G-BGGO
Type
C152
No current signal · last broadcast 13h ago
Flights observed
94
Distinct callsigns
1
Country
GB
Last broadcast
13h ago

Last known position

Most recent position reported by Mode-S 401D8F.

Country allocation

The ICAO 24-bit address 401D8F 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
GBGGO - 94 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 GBGGO - Jul 17, 15:05 UTCJul 17, 16:40 UTC1h 35m
2026-07-17 GBGGO - Jul 17, 13:10 UTCJul 17, 14:24 UTC1h 15m
2026-07-17 GBGGO EMA → BBP Jul 17, 10:15 UTCJul 17, 11:45 UTC1h 30m
2026-07-16 GBGGO - Jul 16, 14:35 UTCJul 16, 15:49 UTC1h 15m
2026-07-16 GBGGO - Jul 16, 11:50 UTCJul 16, 13:15 UTC1h 25m
2026-07-10 GBGGO EMA → EMA Jul 10, 08:55 UTCJul 10, 09:15 UTC20m
2026-07-09 GBGGO EMA → EMA Jul 9, 08:50 UTCJul 9, 09:40 UTC50m
2026-07-08 GBGGO EMA → EMA Jul 8, 14:55 UTCJul 8, 15:45 UTC50m
2026-07-08 GBGGO EMA → EMA Jul 8, 13:00 UTCJul 8, 13:45 UTC45m
2026-07-08 GBGGO - Jul 8, 11:00 UTCJul 8, 11:45 UTC45m
2026-07-08 GBGGO - Jul 8, 09:05 UTCJul 8, 09:45 UTC40m
2026-07-07 GBGGO - Jul 7, 11:45 UTCJul 7, 12:20 UTC35m
2026-07-07 GBGGO - Jul 7, 09:30 UTCJul 7, 10:10 UTC40m
2026-06-24 GBGGO - Jun 24, 15:14 UTCJun 24, 15:49 UTC35m
2026-06-24 GBGGO - Jun 24, 12:04 UTCJun 24, 12:20 UTC15m
2026-06-24 GBGGO - Jun 24, 10:45 UTCJun 24, 11:09 UTC25m
2026-06-24 GBGGO - Jun 24, 09:19 UTCJun 24, 10:04 UTC45m
2026-06-21 GBGGO EMA → EMA Jun 21, 14:54 UTCJun 21, 15:44 UTC50m
2026-06-21 GBGGO - Jun 21, 12:44 UTCJun 21, 13:29 UTC45m
2026-06-18 GBGGO EMA → EMA Jun 18, 14:45 UTCJun 18, 15:25 UTC40m
2026-06-18 GBGGO EMA → EMA Jun 18, 12:25 UTCJun 18, 13:15 UTC50m
2026-06-18 GBGGO EMA → EMA Jun 18, 08:55 UTCJun 18, 09:45 UTC50m
2026-06-14 GBGGO - Jun 14, 10:45 UTCJun 14, 11:35 UTC50m
2026-06-13 GBGGO EMA → EMA Jun 13, 10:20 UTCJun 13, 11:05 UTC45m
2026-06-12 GBGGO EMA → EMA Jun 12, 08:30 UTCJun 12, 08:55 UTC25m
2026-06-08 GBGGO EMA → EMA Jun 8, 14:55 UTCJun 8, 15:40 UTC45m
2026-06-08 GBGGO EMA → EMA Jun 8, 13:00 UTCJun 8, 13:50 UTC50m
2026-06-05 GBGGO EMA → EMA Jun 5, 14:40 UTCJun 5, 15:35 UTC55m
2026-06-05 GBGGO EMA → EMA Jun 5, 12:35 UTCJun 5, 13:20 UTC45m
2026-06-05 GBGGO EMA → EMA Jun 5, 10:35 UTCJun 5, 11:25 UTC50m
2026-06-04 GBGGO - Jun 4, 11:20 UTCJun 4, 12:00 UTC40m
2026-05-31 GBGGO - May 31, 15:15 UTCMay 31, 16:05 UTC50m
2026-05-31 GBGGO - May 31, 12:50 UTCMay 31, 13:35 UTC45m
2026-05-30 GBGGO EMA → EMA May 30, 14:45 UTCMay 30, 15:25 UTC40m
2026-05-29 GBGGO - May 29, 15:10 UTCMay 29, 15:50 UTC40m
2026-05-29 GBGGO EMA → EMA May 29, 11:10 UTCMay 29, 11:55 UTC45m
2026-05-28 GBGGO - May 28, 12:20 UTCMay 28, 13:05 UTC45m
2026-05-28 GBGGO - May 28, 10:20 UTCMay 28, 10:45 UTC25m
2026-05-28 GBGGO - May 28, 09:00 UTCMay 28, 09:40 UTC40m
2026-05-27 GBGGO - May 27, 13:45 UTCMay 27, 16:40 UTC2h 55m
2026-05-27 GBGGO - May 27, 11:10 UTCMay 27, 12:25 UTC1h 15m
2026-05-26 GBGGO - May 26, 09:09 UTCMay 26, 09:40 UTC30m
2026-05-25 GBGGO EMA → EMA May 25, 11:00 UTCMay 25, 12:00 UTC1h 0m
2026-05-25 GBGGO - May 25, 08:40 UTCMay 25, 09:25 UTC45m
2026-05-24 GBGGO - May 24, 15:25 UTCMay 24, 16:35 UTC1h 10m
2026-05-24 GBGGO - May 24, 12:05 UTCMay 24, 12:50 UTC45m
2026-05-24 GBGGO - May 24, 10:50 UTCMay 24, 11:15 UTC25m
2026-05-24 GBGGO - May 24, 09:05 UTCMay 24, 09:40 UTC35m
2026-05-24 GBGGO - May 24, 08:25 UTCMay 24, 09:00 UTC35m
2026-05-23 GBGGO EMA → EMA May 23, 14:50 UTCMay 23, 15:30 UTC40m

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

Mode-S 401D8F frequently asked

What is Mode-S code 401D8F?
401D8F is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-BGGO.
Where is Mode-S 401D8F registered?
Mode-S code 401D8F 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 401D8F broadcasting right now?
No active broadcast right now. Last signal was 13h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 401D8F, octal 20016617, decimal 4,201,871.
What flights does 401D8F operate?
Mode-S 401D8F has broadcast 1 distinct callsign, including GBGGO.