Apparatus

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sensors Mode-S transponder

424502

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to VQ-BHE · BOEING 737-800

Hex
424502
Octal
20442402
Decimal
4,343,042
Country
GB
Tail
VQ-BHE
Type
B738
No current signal · last broadcast 21h ago
Flights observed
48
Distinct callsigns
14
Country
GB
Last broadcast
21h ago

Last known position

Most recent position reported by Mode-S 424502.

Country allocation

The ICAO 24-bit address 424502 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 14 distinct

Callsign Airline Flights Last seen
SMR275 Somon Air 20 2026-05-25
SMR231 Somon Air 6 2026-05-22
SMR331 Somon Air 5 2026-05-28
SMR110 Somon Air 3 2026-05-18
SMR109 Somon Air 3 2026-05-17
SMR337 Somon Air 2 2026-04-21
SMR203 Somon Air 2 2026-04-26
SMR376 Somon Air 1 2026-05-19
SMR375 Somon Air 1 2026-04-28
SMR332 Somon Air 1 2026-04-19
SMR276 - 1 2026-04-15
SMR222 Somon Air 1 2026-05-27
SMR106 Somon Air 1 2026-05-16
SMR105 Somon Air 1 2026-05-12

Recent flights last 48

DateFlightRouteTakeoffLandingDuration
2026-05-28 SMR331 DYU → ZIA May 28, 20:45 UTCMay 29, 08:20 UTC11h 35m
2026-05-27 SMR222 OVB → DYU May 27, 06:25 UTCMay 27, 10:10 UTC3h 46m
2026-05-25 SMR275 LBD → ZIA May 25, 21:49 UTCMay 26, 01:49 UTC4h 0m
2026-05-24 SMR275 LBD → ZIA May 24, 18:00 UTCMay 24, 18:40 UTC40m
2026-05-23 SMR275 LBD → ZIA May 23, 22:25 UTCMay 24, 18:40 UTC20h 15m
2026-05-23 SMR275 LBD → ZIA May 23, 17:30 UTCMay 23, 22:25 UTC4h 55m
2026-05-22 SMR275 LBD → ZIA May 22, 21:20 UTCMay 23, 18:10 UTC20h 50m
2026-05-22 SMR231 DYU → LED May 22, 10:10 UTCMay 22, 21:50 UTC11h 40m
2026-05-19 SMR376 ZIA → LBD May 19, 13:55 UTCMay 20, 05:00 UTC15h 6m
2026-05-19 SMR275 LBD → ZIA May 19, 10:00 UTCMay 20, 05:00 UTC19h 1m
2026-05-18 SMR275 LBD → ZIA May 18, 12:35 UTCMay 19, 10:30 UTC21h 54m
2026-05-18 SMR110 DEL → DYU May 18, 12:00 UTCMay 19, 10:30 UTC22h 29m
2026-05-17 SMR109 DYU → DEL May 17, 22:01 UTCMay 18, 10:15 UTC12h 15m
2026-05-16 SMR106 DXB → DYU May 16, 21:25 UTCMay 16, 21:50 UTC25m
2026-05-14 SMR110 DEL → DYU May 14, 11:30 UTCMay 14, 19:40 UTC8h 10m
2026-05-14 SMR109 DYU → DEL May 14, 08:00 UTCMay 14, 09:00 UTC1h 0m
2026-05-12 SMR105 DYU → DXB May 12, 20:25 UTCMay 13, 03:25 UTC7h 0m
2026-05-11 SMR275 LBD → ZIA May 11, 20:35 UTCMay 12, 20:30 UTC23h 55m
2026-05-11 SMR275 LBD → ZIA May 11, 20:05 UTCMay 11, 20:50 UTC45m
2026-05-10 SMR275 LBD → ZIA May 10, 21:59 UTCMay 11, 20:30 UTC22h 31m
2026-05-10 SMR275 LBD → ZIA May 10, 17:40 UTCMay 10, 22:05 UTC4h 25m
2026-05-09 SMR275 LBD → ZIA May 9, 22:05 UTCMay 10, 18:05 UTC20h 0m
2026-05-09 SMR275 LBD → ZIA May 9, 18:35 UTCMay 10, 18:05 UTC23h 30m
2026-05-09 SMR275 LBD → ZIA May 9, 18:10 UTCMay 9, 22:15 UTC4h 5m
2026-05-09 SMR275 LBD → ZIA May 9, 01:10 UTCMay 9, 22:15 UTC21h 5m
2026-05-08 SMR231 DYU → LED May 8, 20:55 UTCMay 9, 18:55 UTC22h 0m
2026-05-08 SMR231 DYU → LED May 8, 08:59 UTCMay 9, 01:20 UTC16h 20m
2026-05-07 SMR231 DYU → LED May 7, 22:35 UTCMay 8, 22:05 UTC23h 30m
2026-05-07 SMR275 LBD → ZIA May 7, 21:05 UTCMay 8, 11:55 UTC14h 50m
2026-05-06 SMR275 LBD → ZIA May 6, 17:50 UTCMay 6, 22:30 UTC4h 40m
2026-05-04 SMR331 DYU → ZIA May 4, 21:15 UTCMay 4, 21:40 UTC25m
2026-05-02 SMR331 DYU → ZIA May 2, 21:20 UTCMay 2, 22:00 UTC40m
2026-05-01 SMR231 DYU → LED May 1, 08:30 UTCMay 1, 21:45 UTC13h 15m
2026-04-30 SMR110 DEL → DYU Apr 30, 11:05 UTCMay 1, 08:40 UTC21h 35m
2026-04-30 SMR109 DYU → DEL Apr 30, 08:00 UTCApr 30, 08:50 UTC50m
2026-04-28 SMR375 LBD → ZIA Apr 28, 17:40 UTCApr 28, 18:15 UTC35m
2026-04-27 SMR331 DYU → ZIA Apr 27, 21:25 UTCApr 28, 18:15 UTC20h 50m
2026-04-26 SMR203 DYU → LED Apr 26, 08:30 UTCApr 26, 20:05 UTC11h 35m
2026-04-25 SMR331 DYU → ZIA Apr 25, 19:40 UTCApr 26, 12:45 UTC17h 5m
2026-04-23 SMR203 DYU → LED Apr 23, 19:30 UTCApr 24, 12:45 UTC17h 15m
2026-04-21 SMR337 DYU → ZIA Apr 21, 05:50 UTCApr 21, 21:30 UTC15h 40m
2026-04-20 SMR337 DYU → ZIA Apr 20, 06:05 UTCApr 20, 06:25 UTC20m
2026-04-19 SMR332 ZIA → DYU Apr 19, 02:05 UTCApr 19, 06:10 UTC4h 5m
2026-04-15 SMR276 - Apr 15, 21:35 UTCApr 15, 22:30 UTC55m
2026-04-15 SMR275 LBD → ZIA Apr 15, 17:30 UTCApr 15, 18:10 UTC40m
2026-04-14 SMR231 - Apr 14, 21:25 UTCApr 14, 21:55 UTC30m
2026-04-13 SMR275 LBD → ZIA Apr 13, 19:55 UTCApr 13, 20:30 UTC35m
2026-04-12 SMR275 LBD → ZIA Apr 12, 18:10 UTCApr 12, 18:40 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 VQ-BHE page for operator, model, and routing details .

Mode-S 424502 frequently asked

What is Mode-S code 424502?
424502 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to VQ-BHE.
Where is Mode-S 424502 registered?
Mode-S code 424502 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 424502 broadcasting right now?
No active broadcast right now. Last signal was 21h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 424502, octal 20442402, decimal 4,343,042.
What flights does 424502 operate?
Mode-S 424502 has broadcast 14 distinct callsigns, including SMR275, SMR231, SMR331, SMR110, SMR109.