Apparatus

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sensors Mode-S transponder

403450

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-NIKL · ROBINSON R-22 Mariner

Hex
403450
Octal
20032120
Decimal
4,207,696
Country
GB
Tail
G-NIKL
Type
R22
No current signal · last broadcast 9h ago
Flights observed
63
Distinct callsigns
1
Country
GB
Last broadcast
9h ago

Last known position

Most recent position reported by Mode-S 403450.

Country allocation

The ICAO 24-bit address 403450 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
GNIKL - 63 2026-07-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-19 GNIKL - Jul 19, 09:05 UTCJul 19, 10:05 UTC1h 0m
2026-07-18 GNIKL - Jul 18, 12:40 UTCJul 18, 13:10 UTC30m
2026-07-18 GNIKL - Jul 18, 09:40 UTCJul 18, 10:20 UTC40m
2026-07-17 GNIKL - Jul 17, 15:15 UTCJul 17, 15:29 UTC15m
2026-07-17 GNIKL - Jul 17, 13:00 UTCJul 17, 13:55 UTC55m
2026-07-17 GNIKL - Jul 17, 10:20 UTCJul 17, 11:00 UTC40m
2026-07-16 GNIKL - Jul 16, 13:30 UTCJul 16, 15:25 UTC1h 55m
2026-07-15 GNIKL - Jul 15, 12:00 UTCJul 15, 13:00 UTC1h 0m
2026-07-15 GNIKL - Jul 15, 09:50 UTCJul 15, 10:40 UTC50m
2026-07-14 GNIKL - Jul 14, 14:25 UTCJul 14, 15:45 UTC1h 20m
2026-07-14 GNIKL - Jul 14, 12:10 UTCJul 14, 12:20 UTC10m
2026-07-13 GNIKL - Jul 13, 10:30 UTCJul 13, 11:45 UTC1h 15m
2026-07-11 GNIKL - Jul 11, 12:30 UTCJul 11, 13:55 UTC1h 25m
2026-07-10 GNIKL - Jul 10, 08:10 UTCJul 10, 11:20 UTC3h 10m
2026-07-09 GNIKL - Jul 9, 12:30 UTCJul 9, 13:00 UTC30m
2026-07-09 GNIKL - Jul 9, 11:05 UTCJul 9, 11:30 UTC25m
2026-07-08 GNIKL - Jul 8, 10:40 UTCJul 8, 11:50 UTC1h 10m
2026-07-07 GNIKL - Jul 7, 13:35 UTCJul 7, 15:00 UTC1h 25m
2026-07-07 GNIKL - Jul 7, 10:20 UTCJul 7, 11:25 UTC1h 5m
2026-07-02 GNIKL - Jul 2, 13:45 UTCJul 2, 14:25 UTC40m
2026-07-02 GNIKL - Jul 2, 10:25 UTCJul 2, 11:30 UTC1h 5m
2026-06-30 GNIKL - Jun 30, 17:20 UTCJun 30, 17:55 UTC35m
2026-06-30 GNIKL - Jun 30, 16:15 UTCJun 30, 16:35 UTC20m
2026-06-30 GNIKL - Jun 30, 11:05 UTCJun 30, 12:00 UTC55m
2026-06-30 GNIKL - Jun 30, 09:05 UTCJun 30, 10:35 UTC1h 30m
2026-06-29 GNIKL - Jun 29, 11:14 UTCJun 29, 12:09 UTC55m
2026-06-28 GNIKL - Jun 28, 09:55 UTCJun 28, 10:44 UTC50m
2026-06-27 GNIKL - Jun 27, 10:00 UTCJun 27, 10:10 UTC10m
2026-06-26 GNIKL - Jun 26, 10:44 UTCJun 26, 11:09 UTC25m
2026-06-26 GNIKL - Jun 26, 09:24 UTCJun 26, 09:59 UTC35m
2026-06-19 GNIKL - Jun 19, 11:39 UTCJun 19, 12:04 UTC25m
2026-06-19 GNIKL - Jun 19, 09:30 UTCJun 19, 10:50 UTC1h 20m
2026-06-16 GNIKL - Jun 16, 11:10 UTCJun 16, 11:35 UTC25m
2026-06-16 GNIKL - Jun 16, 07:40 UTCJun 16, 07:55 UTC15m
2026-06-15 GNIKL - Jun 15, 14:24 UTCJun 15, 15:25 UTC1h 0m
2026-06-12 GNIKL - Jun 12, 09:25 UTCJun 12, 09:40 UTC15m
2026-06-12 GNIKL - Jun 12, 08:30 UTCJun 12, 08:45 UTC15m
2026-06-09 GNIKL - Jun 9, 14:40 UTCJun 9, 15:30 UTC50m
2026-06-09 GNIKL - Jun 9, 13:15 UTCJun 9, 13:35 UTC20m
2026-06-09 GNIKL - Jun 9, 10:35 UTCJun 9, 12:25 UTC1h 50m
2026-06-07 GNIKL - Jun 7, 11:55 UTCJun 7, 12:15 UTC20m
2026-05-29 GNIKL - May 29, 13:45 UTCMay 29, 14:50 UTC1h 5m
2026-05-27 GNIKL - May 27, 14:05 UTCMay 27, 15:00 UTC55m
2026-05-27 GNIKL - May 27, 11:10 UTCMay 27, 11:55 UTC45m
2026-05-21 GNIKL - May 21, 12:00 UTCMay 21, 12:55 UTC55m
2026-05-20 GNIKL - May 20, 12:40 UTCMay 20, 13:15 UTC35m
2026-05-20 GNIKL - May 20, 08:55 UTCMay 20, 10:05 UTC1h 10m
2026-05-19 GNIKL - May 19, 11:00 UTCMay 19, 12:20 UTC1h 20m
2026-05-15 GNIKL - May 15, 12:50 UTCMay 15, 13:25 UTC35m
2026-05-15 GNIKL - May 15, 10:55 UTCMay 15, 12:15 UTC1h 20m

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

Mode-S 403450 frequently asked

What is Mode-S code 403450?
403450 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-NIKL.
Where is Mode-S 403450 registered?
Mode-S code 403450 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 403450 broadcasting right now?
No active broadcast right now. Last signal was 9h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 403450, octal 20032120, decimal 4,207,696.
What flights does 403450 operate?
Mode-S 403450 has broadcast 1 distinct callsign, including GNIKL.