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sensors Mode-S transponder

424C35

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to M-SKTO · AIRBUS HELICOPTERS H-160

Hex
424C35
Octal
20446065
Decimal
4,344,885
Country
GB
Tail
M-SKTO
Type
H160
No current signal · last broadcast Jul 25, 18:25 UTC
Flights observed
58
Distinct callsigns
1
Country
GB
Last broadcast
Jul 25, 18:25 UTC

Last known position

Most recent position reported by Mode-S 424C35.

Country allocation

The ICAO 24-bit address 424C35 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
MSKTO - 58 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 MSKTO LPL → BLK Jul 25, 16:15 UTCJul 25, 18:25 UTC2h 10m
2026-07-25 MSKTO GLA → LPL Jul 25, 14:10 UTCJul 25, 15:15 UTC1h 5m
2026-07-25 MSKTO - Jul 25, 09:05 UTCJul 25, 10:40 UTC1h 35m
2026-07-25 MSKTO BLK → LPL Jul 25, 08:25 UTCJul 25, 08:40 UTC15m
2026-07-24 MSKTO - Jul 24, 15:00 UTCJul 24, 15:10 UTC10m
2026-07-24 MSKTO - Jul 24, 13:40 UTCJul 24, 14:40 UTC1h 0m
2026-07-24 MSKTO - Jul 24, 11:10 UTCJul 24, 12:05 UTC55m
2026-07-24 MSKTO - Jul 24, 10:25 UTCJul 24, 10:35 UTC10m
2026-07-22 MSKTO - Jul 22, 11:35 UTCJul 22, 11:50 UTC15m
2026-07-22 MSKTO - Jul 22, 11:10 UTCJul 22, 11:20 UTC10m
2026-07-21 MSKTO - Jul 21, 13:45 UTCJul 21, 14:00 UTC15m
2026-07-21 MSKTO - Jul 21, 12:55 UTCJul 21, 13:30 UTC35m
2026-07-21 MSKTO - Jul 21, 08:15 UTCJul 21, 08:50 UTC35m
2026-07-21 MSKTO - Jul 21, 07:45 UTCJul 21, 07:55 UTC10m
2026-07-14 MSKTO OXF → BLK Jul 14, 16:10 UTCJul 14, 17:10 UTC1h 0m
2026-07-13 MSKTO BLK → OXF Jul 13, 07:01 UTCJul 13, 08:01 UTC1h 0m
2026-07-10 MSKTO - Jul 10, 15:55 UTCJul 10, 16:05 UTC10m
2026-07-10 MSKTO - Jul 10, 15:05 UTCJul 10, 15:35 UTC30m
2026-07-10 MSKTO - Jul 10, 13:10 UTCJul 10, 13:35 UTC25m
2026-07-10 MSKTO - Jul 10, 12:30 UTCJul 10, 12:40 UTC10m
2026-07-09 MSKTO LPL → BLK Jul 9, 14:00 UTCJul 9, 14:20 UTC20m
2026-07-09 MSKTO - Jul 9, 11:50 UTCJul 9, 13:00 UTC1h 10m
2026-07-09 MSKTO - Jul 9, 08:35 UTCJul 9, 09:35 UTC1h 0m
2026-07-09 MSKTO - Jul 9, 07:30 UTCJul 9, 07:45 UTC15m
2026-07-08 MSKTO OXF → BLK Jul 8, 16:35 UTCJul 8, 17:35 UTC1h 0m
2026-07-07 MSKTO - Jul 7, 14:10 UTCJul 7, 14:20 UTC10m
2026-07-07 MSKTO OXF → OXF Jul 7, 11:30 UTCJul 7, 11:50 UTC20m
2026-07-07 MSKTO - Jul 7, 08:35 UTCJul 7, 08:50 UTC15m
2026-05-18 MSKTO BLK → OXF May 18, 07:10 UTCMay 18, 08:05 UTC55m
2026-05-16 MSKTO - May 16, 13:05 UTCMay 16, 13:31 UTC25m
2026-05-16 MSKTO - May 16, 11:46 UTCMay 16, 12:45 UTC1h 0m
2026-05-16 MSKTO - May 16, 08:20 UTCMay 16, 09:21 UTC1h 0m
2026-05-16 MSKTO - May 16, 07:25 UTCMay 16, 07:35 UTC10m
2026-05-15 MSKTO - May 15, 15:00 UTCMay 15, 15:10 UTC10m
2026-05-15 MSKTO - May 15, 13:05 UTCMay 15, 14:35 UTC1h 30m
2026-05-15 MSKTO - May 15, 08:20 UTCMay 15, 10:00 UTC1h 40m
2026-05-15 MSKTO - May 15, 07:40 UTCMay 15, 07:50 UTC10m
2026-05-10 MSKTO - May 10, 11:20 UTCMay 10, 12:15 UTC55m
2026-05-10 MSKTO - May 10, 10:15 UTCMay 10, 10:30 UTC15m
2026-05-10 MSKTO - May 10, 07:55 UTCMay 10, 09:10 UTC1h 15m
2026-05-10 MSKTO BLK → LPL May 10, 07:04 UTCMay 10, 07:19 UTC15m
2026-05-09 MSKTO - May 9, 12:00 UTCMay 9, 13:40 UTC1h 40m
2026-05-09 MSKTO - May 9, 08:05 UTCMay 9, 09:05 UTC1h 0m
2026-05-09 MSKTO - May 9, 07:20 UTCMay 9, 07:30 UTC10m
2026-05-04 MSKTO LPL → BLK May 4, 07:25 UTCMay 4, 07:40 UTC15m
2026-05-03 MSKTO LPL → LPL May 3, 16:09 UTCMay 3, 18:40 UTC2h 30m
2026-05-03 MSKTO BLK → LPL May 3, 14:50 UTCMay 3, 15:05 UTC15m
2026-05-01 MSKTO LPL → BLK May 1, 17:20 UTCMay 1, 17:45 UTC25m
2026-05-01 MSKTO - May 1, 14:35 UTCMay 1, 16:45 UTC2h 10m
2026-05-01 MSKTO - May 1, 13:20 UTCMay 1, 13:55 UTC35m

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 M-SKTO page for operator, model, and routing details .

Mode-S 424C35 frequently asked

What is Mode-S code 424C35?
424C35 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to M-SKTO.
Where is Mode-S 424C35 registered?
Mode-S code 424C35 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 424C35 broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 18:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 424C35, octal 20446065, decimal 4,344,885.
What flights does 424C35 operate?
Mode-S 424C35 has broadcast 1 distinct callsign, including MSKTO.