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sensors Mode-S transponder

401B28

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-BBXW · PIPER PA-28-140/150/160/180

Hex
401B28
Octal
20015450
Decimal
4,201,256
Country
GB
Tail
G-BBXW
Type
P28A
No current signal · last broadcast Jul 26, 11:55 UTC
Flights observed
209
Distinct callsigns
1
Country
GB
Last broadcast
Jul 26, 11:55 UTC

Last known position

Most recent position reported by Mode-S 401B28.

Country allocation

The ICAO 24-bit address 401B28 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
GBBXW - 209 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 GBBXW GLO → GLO Jul 26, 11:00 UTCJul 26, 11:55 UTC55m
2026-07-25 GBBXW - Jul 25, 15:55 UTCJul 25, 17:00 UTC1h 5m
2026-07-25 GBBXW GLO → GLO Jul 25, 13:50 UTCJul 25, 14:50 UTC1h 0m
2026-07-25 GBBXW - Jul 25, 09:40 UTCJul 25, 10:35 UTC55m
2026-07-24 GBBXW - Jul 24, 15:55 UTCJul 24, 16:45 UTC50m
2026-07-24 GBBXW - Jul 24, 13:40 UTCJul 24, 14:30 UTC50m
2026-07-24 GBBXW - Jul 24, 12:00 UTCJul 24, 12:45 UTC45m
2026-07-24 GBBXW GLO → GLO Jul 24, 09:00 UTCJul 24, 09:40 UTC40m
2026-07-24 GBBXW - Jul 24, 07:40 UTCJul 24, 08:30 UTC50m
2026-07-23 GBBXW GLO → GLO Jul 23, 09:00 UTCJul 23, 10:00 UTC1h 0m
2026-07-23 GBBXW - Jul 23, 07:45 UTCJul 23, 08:30 UTC45m
2026-07-22 GBBXW - Jul 22, 15:45 UTCJul 22, 16:35 UTC50m
2026-07-21 GBBXW - Jul 21, 16:00 UTCJul 21, 16:40 UTC40m
2026-07-21 GBBXW - Jul 21, 13:10 UTCJul 21, 13:45 UTC35m
2026-07-21 GBBXW GLO → GLO Jul 21, 11:50 UTCJul 21, 12:35 UTC45m
2026-07-21 GBBXW - Jul 21, 09:20 UTCJul 21, 09:55 UTC35m
2026-07-21 GBBXW - Jul 21, 08:10 UTCJul 21, 08:45 UTC35m
2026-07-19 GBBXW - Jul 19, 15:35 UTCJul 19, 16:35 UTC1h 0m
2026-07-19 GBBXW - Jul 19, 09:50 UTCJul 19, 10:50 UTC1h 0m
2026-07-19 GBBXW - Jul 19, 08:10 UTCJul 19, 08:55 UTC45m
2026-07-18 GBBXW - Jul 18, 15:35 UTCJul 18, 16:25 UTC50m
2026-07-18 GBBXW GLO → GLO Jul 18, 13:20 UTCJul 18, 14:05 UTC45m
2026-07-18 GBBXW GLO → GLO Jul 18, 11:50 UTCJul 18, 12:35 UTC45m
2026-07-18 GBBXW - Jul 18, 10:20 UTCJul 18, 10:40 UTC20m
2026-07-18 GBBXW - Jul 18, 08:35 UTCJul 18, 09:15 UTC40m
2026-07-17 GBBXW GLO → GLO Jul 17, 16:49 UTCJul 17, 17:50 UTC1h 0m
2026-07-17 GBBXW - Jul 17, 14:44 UTCJul 17, 15:35 UTC50m
2026-07-17 GBBXW - Jul 17, 12:55 UTCJul 17, 13:45 UTC50m
2026-07-17 GBBXW GLO → GLO Jul 17, 09:15 UTCJul 17, 10:15 UTC1h 0m
2026-07-16 GBBXW GLO → GLO Jul 16, 17:35 UTCJul 16, 18:25 UTC50m
2026-07-16 GBBXW - Jul 16, 13:34 UTCJul 16, 14:10 UTC35m
2026-07-16 GBBXW GLO → GLO Jul 16, 11:10 UTCJul 16, 11:50 UTC40m
2026-07-16 GBBXW - Jul 16, 09:30 UTCJul 16, 10:15 UTC45m
2026-07-15 GBBXW - Jul 15, 10:55 UTCJul 15, 11:30 UTC35m
2026-07-15 GBBXW - Jul 15, 09:40 UTCJul 15, 10:15 UTC35m
2026-07-14 GBBXW - Jul 14, 14:20 UTCJul 14, 14:55 UTC35m
2026-07-14 GBBXW - Jul 14, 12:50 UTCJul 14, 13:25 UTC35m
2026-07-14 GBBXW - Jul 14, 10:35 UTCJul 14, 11:15 UTC40m
2026-07-14 GBBXW GLO → GLO Jul 14, 09:15 UTCJul 14, 10:00 UTC45m
2026-07-13 GBBXW - Jul 13, 10:50 UTCJul 13, 11:30 UTC40m
2026-07-13 GBBXW - Jul 13, 09:40 UTCJul 13, 10:15 UTC35m
2026-07-13 GBBXW GLO → GLO Jul 13, 08:01 UTCJul 13, 08:50 UTC50m
2026-07-12 GBBXW GLO → GLO Jul 12, 15:15 UTCJul 12, 16:01 UTC45m
2026-07-12 GBBXW - Jul 12, 11:35 UTCJul 12, 12:40 UTC1h 5m
2026-07-12 GBBXW GLO → CEG Jul 12, 08:30 UTCJul 12, 09:30 UTC1h 0m
2026-07-11 GBBXW GLO → GLO Jul 11, 17:50 UTCJul 11, 19:55 UTC2h 5m
2026-07-11 GBBXW GLO → GLO Jul 11, 15:45 UTCJul 11, 16:30 UTC45m
2026-07-11 GBBXW GLO → GLO Jul 11, 13:50 UTCJul 11, 14:45 UTC55m
2026-07-11 GBBXW - Jul 11, 11:55 UTCJul 11, 12:15 UTC20m
2026-07-11 GBBXW - Jul 11, 09:30 UTCJul 11, 10:10 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-BBXW page for operator, model, and routing details .

Mode-S 401B28 frequently asked

What is Mode-S code 401B28?
401B28 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-BBXW.
Where is Mode-S 401B28 registered?
Mode-S code 401B28 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 401B28 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 11:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 401B28, octal 20015450, decimal 4,201,256.
What flights does 401B28 operate?
Mode-S 401B28 has broadcast 1 distinct callsign, including GBBXW.