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sensors Mode-S transponder

424B86

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to M-SPEK · BEECHCRAFT Super King Air 350

Hex
424B86
Octal
20445606
Decimal
4,344,710
Country
GB
Tail
M-SPEK
Type
B350
Broadcasting now · callsign SSZ3 · 5,950 ft
Flights observed
177
Distinct callsigns
19
Country
GB
Last broadcast
21h ago

Current position

424B86 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 424B86 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 19 distinct

Callsign Airline Flights Last seen
SSZ9A - 24 2026-07-12
SSZ8 - 22 2026-07-13
SSZ7 - 22 2026-07-13
SSZ9B - 20 2026-07-12
SSZ6 - 15 2026-07-08
SSZ5 - 15 2026-07-08
SSZ9C - 9 2026-07-02
SSZ3 - 8 2026-07-09
SSZ9D - 7 2026-07-02
SSZ4 - 7 2026-07-09
SSZ2 - 7 2026-07-09
SSZ1 - 7 2026-07-09
SSZ101 - 5 2026-06-23
SSZ202 - 3 2026-06-16
SSZ102 - 2 2026-06-23
SSZ341 - 1 2026-05-01
SSZ241 - 1 2026-05-01
SSZ201 - 1 2026-04-29
SSZ103 - 1 2026-06-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 SSZ8 EMA → GCI Jul 13, 18:00 UTCJul 13, 19:00 UTC1h 0m
2026-07-13 SSZ7 - Jul 13, 16:10 UTCJul 13, 17:10 UTC1h 0m
2026-07-12 SSZ9B - Jul 12, 17:05 UTCJul 12, 18:01 UTC55m
2026-07-12 SSZ9A GCI → BQH Jul 12, 14:10 UTCJul 12, 15:20 UTC1h 10m
2026-07-11 SSZ9B - Jul 11, 11:00 UTCJul 11, 11:35 UTC35m
2026-07-11 SSZ9A GCI → CWL Jul 11, 09:25 UTCJul 11, 10:05 UTC40m
2026-07-10 SSZ8 - Jul 10, 14:45 UTCJul 10, 15:20 UTC35m
2026-07-10 SSZ8 - Jul 10, 14:30 UTCJul 10, 14:40 UTC10m
2026-07-10 SSZ7 - Jul 10, 12:45 UTCJul 10, 13:45 UTC1h 0m
2026-07-09 SSZ4 - Jul 9, 17:35 UTCJul 9, 18:00 UTC25m
2026-07-09 SSZ3 GCI → SOU Jul 9, 16:30 UTCJul 9, 17:00 UTC30m
2026-07-09 SSZ2 SOU → GCI Jul 9, 07:30 UTCJul 9, 08:00 UTC30m
2026-07-09 SSZ1 GCI → SOU Jul 9, 05:55 UTCJul 9, 06:20 UTC25m
2026-07-08 SSZ8 EMA → GCI Jul 8, 17:50 UTCJul 8, 18:40 UTC50m
2026-07-08 SSZ7 - Jul 8, 15:50 UTCJul 8, 16:50 UTC1h 0m
2026-07-08 SSZ6 EMA → GCI Jul 8, 07:40 UTCJul 8, 08:30 UTC50m
2026-07-08 SSZ5 GCI → EMA Jul 8, 05:55 UTCJul 8, 06:50 UTC55m
2026-07-07 SSZ4 - Jul 7, 17:35 UTCJul 7, 18:05 UTC30m
2026-07-07 SSZ3 GCI → SOU Jul 7, 16:25 UTCJul 7, 17:00 UTC35m
2026-07-07 SSZ2 SOU → GCI Jul 7, 07:20 UTCJul 7, 07:55 UTC35m
2026-07-07 SSZ1 GCI → SOU Jul 7, 05:55 UTCJul 7, 06:30 UTC35m
2026-07-06 SSZ8 EMA → GCI Jul 6, 17:45 UTCJul 6, 18:35 UTC50m
2026-07-06 SSZ7 GCI → EMA Jul 6, 16:00 UTCJul 6, 16:55 UTC55m
2026-07-06 SSZ6 EMA → GCI Jul 6, 07:40 UTCJul 6, 08:35 UTC55m
2026-07-06 SSZ5 GCI → EMA Jul 6, 05:55 UTCJul 6, 06:50 UTC55m
2026-07-03 SSZ9B FAB → GCI Jul 3, 17:40 UTCJul 3, 18:15 UTC35m
2026-07-03 SSZ9A GCI → FAB Jul 3, 16:00 UTCJul 3, 16:45 UTC45m
2026-07-02 SSZ9D - Jul 2, 17:15 UTCJul 2, 17:45 UTC30m
2026-07-02 SSZ9C EMA → SOU Jul 2, 16:10 UTCJul 2, 16:45 UTC35m
2026-07-02 SSZ9B - Jul 2, 07:10 UTCJul 2, 07:45 UTC35m
2026-07-02 SSZ9A GCI → SOU Jul 2, 05:55 UTCJul 2, 06:30 UTC35m
2026-07-01 SSZ8 - Jul 1, 17:35 UTCJul 1, 18:25 UTC50m
2026-07-01 SSZ7 GCI → EMA Jul 1, 16:00 UTCJul 1, 17:00 UTC1h 0m
2026-07-01 SSZ6 EMA → GCI Jul 1, 07:45 UTCJul 1, 08:35 UTC50m
2026-07-01 SSZ5 GCI → EMA Jul 1, 05:55 UTCJul 1, 06:55 UTC1h 0m
2026-06-30 SSZ9A - Jun 30, 16:25 UTCJun 30, 17:05 UTC40m
2026-06-30 SSZ9A GCI → EXT Jun 30, 15:30 UTCJun 30, 16:15 UTC45m
2026-06-30 SSZ2 SOU → GCI Jun 30, 07:10 UTCJun 30, 07:40 UTC30m
2026-06-30 SSZ1 GCI → SOU Jun 30, 05:50 UTCJun 30, 06:20 UTC30m
2026-06-29 SSZ8 EMA → GCI Jun 29, 17:34 UTCJun 29, 18:34 UTC1h 0m
2026-06-29 SSZ7 GCI → EMA Jun 29, 16:00 UTCJun 29, 16:55 UTC55m
2026-06-29 SSZ6 EMA → GCI Jun 29, 07:55 UTCJun 29, 08:50 UTC55m
2026-06-29 SSZ5 GCI → EMA Jun 29, 05:45 UTCJun 29, 06:40 UTC55m
2026-06-25 SSZ3 GCI → GCI Jun 25, 16:35 UTCJun 25, 16:59 UTC25m
2026-06-24 SSZ9B BRS → GCI Jun 24, 12:44 UTCJun 24, 13:20 UTC35m
2026-06-24 SSZ9A - Jun 24, 08:30 UTCJun 24, 09:09 UTC40m
2026-06-23 SSZ9D - Jun 23, 16:54 UTCJun 23, 17:30 UTC35m
2026-06-23 SSZ9C - Jun 23, 15:34 UTCJun 23, 16:14 UTC40m
2026-06-23 SSZ103 - Jun 23, 07:49 UTCJun 23, 08:30 UTC40m
2026-06-23 SSZ102 - Jun 23, 06:49 UTCJun 23, 07:19 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 M-SPEK page for operator, model, and routing details .

Mode-S 424B86 frequently asked

What is Mode-S code 424B86?
424B86 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to M-SPEK.
Where is Mode-S 424B86 registered?
Mode-S code 424B86 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 424B86 broadcasting right now?
Yes. Mode-S 424B86 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 424B86, octal 20445606, decimal 4,344,710.
What flights does 424B86 operate?
Mode-S 424B86 has broadcast 19 distinct callsigns, including SSZ9A, SSZ8, SSZ7, SSZ9B, SSZ6.