Apparatus

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sensors Mode-S transponder

424455

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to VQ-BBL · BOEING 737-900

Hex
424455
Octal
20442125
Decimal
4,342,869
Country
GB
Tail
VQ-BBL
Type
B739
No current signal · last broadcast 1d ago
Flights observed
53
Distinct callsigns
14
Country
GB
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 424455.

Country allocation

The ICAO 24-bit address 424455 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
SMR103 - 12 2026-07-14
SMR109 - 8 2026-06-25
SMR104 - 8 2026-07-14
SMR221 - 7 2026-07-12
SMR222 - 4 2026-07-10
SMR110 - 4 2026-06-25
SMR106 - 2 2026-06-27
SMR105 - 2 2026-06-27
SMR8338 - 1 2026-07-08
SMR8112 Somon Air 1 2026-04-24
SMR214 Somon Air 1 2026-04-27
SMR213 Somon Air 1 2026-05-31
SMR209 Somon Air 1 2026-05-03
SMR203 Somon Air 1 2026-07-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-16 SMR203 DYU → LED Jul 16, 20:09 UTCJul 16, 20:25 UTC15m
2026-07-14 SMR104 - Jul 14, 08:10 UTCJul 14, 10:00 UTC1h 50m
2026-07-14 SMR103 - Jul 14, 05:40 UTCJul 14, 06:00 UTC20m
2026-07-14 SMR103 - Jul 14, 03:40 UTCJul 14, 05:05 UTC1h 25m
2026-07-12 SMR221 - Jul 12, 19:55 UTCJul 12, 23:40 UTC3h 45m
2026-07-10 SMR222 - Jul 10, 09:15 UTCJul 10, 12:55 UTC3h 40m
2026-07-08 SMR8338 - Jul 8, 11:15 UTCJul 8, 11:30 UTC15m
2026-07-01 SMR222 - Jul 1, 06:05 UTCJul 1, 10:05 UTC4h 0m
2026-06-27 SMR106 - Jun 27, 21:40 UTCJun 27, 22:04 UTC25m
2026-06-27 SMR105 - Jun 27, 18:29 UTCJun 27, 18:54 UTC25m
2026-06-25 SMR110 - Jun 25, 11:04 UTCJun 25, 11:39 UTC35m
2026-06-25 SMR109 - Jun 25, 08:20 UTCJun 25, 09:20 UTC1h 0m
2026-06-24 SMR109 - Jun 24, 09:59 UTCJun 25, 09:14 UTC23h 15m
2026-06-23 SMR221 - Jun 23, 13:19 UTCJun 24, 10:25 UTC21h 5m
2026-06-23 SMR104 IST → DYU Jun 23, 11:24 UTCJun 24, 10:25 UTC23h 0m
2026-06-23 SMR103 - Jun 23, 06:39 UTCJun 23, 09:05 UTC2h 25m
2026-06-21 SMR221 - Jun 21, 18:35 UTCJun 21, 22:20 UTC3h 45m
2026-06-14 SMR222 OVB → DYU Jun 14, 21:05 UTCJun 15, 00:29 UTC3h 24m
2026-06-12 SMR104 IST → DYU Jun 12, 10:20 UTCJun 12, 12:20 UTC2h 0m
2026-06-12 SMR103 DYU → IST Jun 12, 05:55 UTCJun 12, 08:15 UTC2h 20m
2026-06-10 SMR221 DYU → OVB Jun 10, 06:55 UTCJun 10, 10:25 UTC3h 30m
2026-06-09 SMR221 DYU → OVB Jun 9, 13:20 UTCJun 10, 10:25 UTC21h 5m
2026-06-09 SMR104 IST → DYU Jun 9, 11:50 UTCJun 10, 10:25 UTC22h 35m
2026-06-09 SMR103 DYU → IST Jun 9, 09:10 UTCJun 9, 09:40 UTC30m
2026-06-09 SMR103 DYU → IST Jun 9, 07:15 UTCJun 9, 08:35 UTC1h 20m
2026-06-05 SMR104 IST → DYU Jun 5, 09:55 UTCJun 5, 12:00 UTC2h 5m
2026-06-05 SMR103 DYU → IST Jun 5, 06:00 UTCJun 5, 08:05 UTC2h 5m
2026-05-31 SMR213 DYU → KJA May 31, 18:30 UTCJun 1, 11:20 UTC16h 50m
2026-05-28 SMR110 DEL → DYU May 28, 10:45 UTCMay 28, 11:25 UTC40m
2026-05-28 SMR109 DYU → DEL May 28, 08:10 UTCMay 28, 08:50 UTC40m
2026-05-22 SMR104 IST → DYU May 22, 12:40 UTCMay 22, 13:40 UTC1h 0m
2026-05-22 SMR103 DYU → IST May 22, 06:30 UTCMay 22, 07:45 UTC1h 15m
2026-05-17 SMR221 DYU → OVB May 17, 08:45 UTCMay 17, 18:55 UTC10h 10m
2026-05-13 SMR221 DYU → OVB May 13, 06:10 UTCMay 13, 09:50 UTC3h 40m
2026-05-08 SMR104 IST → DYU May 8, 08:19 UTCMay 8, 10:14 UTC1h 55m
2026-05-07 SMR103 DYU → IST May 7, 11:55 UTCMay 8, 05:24 UTC17h 30m
2026-05-07 SMR103 DYU → IST May 7, 09:20 UTCMay 8, 05:24 UTC20h 4m
2026-05-07 SMR103 DYU → IST May 7, 08:15 UTCMay 8, 05:24 UTC21h 10m
2026-05-03 SMR209 DYU → SVX May 3, 06:15 UTCMay 3, 06:30 UTC15m
2026-04-29 SMR222 OVB → DYU Apr 29, 09:35 UTCApr 29, 09:55 UTC20m
2026-04-27 SMR214 KJA → DYU Apr 27, 05:55 UTCApr 27, 11:20 UTC5h 25m
2026-04-25 SMR106 DXB → DYU Apr 25, 21:35 UTCApr 25, 22:00 UTC25m
2026-04-25 SMR105 DYU → DXB Apr 25, 18:50 UTCApr 25, 19:15 UTC25m
2026-04-24 SMR8112 MSQ → LBD Apr 24, 21:50 UTCApr 25, 19:15 UTC21h 25m
2026-04-24 SMR104 IST → DYU Apr 24, 08:25 UTCApr 24, 10:10 UTC1h 45m
2026-04-23 SMR103 DYU → IST Apr 23, 11:20 UTCApr 24, 05:20 UTC17h 59m
2026-04-23 SMR109 DYU → DEL Apr 23, 08:05 UTCApr 23, 08:50 UTC45m
2026-04-22 SMR109 DYU → DEL Apr 22, 09:50 UTCApr 23, 08:50 UTC23h 0m
2026-04-20 SMR110 DEL → DYU Apr 20, 11:20 UTCApr 20, 11:55 UTC35m
2026-04-19 SMR109 DYU → DEL Apr 19, 15:10 UTCApr 20, 08:55 UTC17h 45m

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

Mode-S 424455 frequently asked

What is Mode-S code 424455?
424455 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to VQ-BBL.
Where is Mode-S 424455 registered?
Mode-S code 424455 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 424455 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 424455, octal 20442125, decimal 4,342,869.
What flights does 424455 operate?
Mode-S 424455 has broadcast 14 distinct callsigns, including SMR103, SMR109, SMR104, SMR221, SMR222.