Apparatus

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sensors Mode-S transponder

407504

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-CKUZ · BOEING 737-400

Hex
407504
Octal
20072404
Decimal
4,224,260
Country
GB
Tail
G-CKUZ
Type
B734
No current signal · last broadcast 10h ago
Flights observed
100
Distinct callsigns
11
Country
GB
Last broadcast
10h ago

Last known position

Most recent position reported by Mode-S 407504.

Country allocation

The ICAO 24-bit address 407504 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 11 distinct

Callsign Airline Flights Last seen
NPT2EA - 40 2026-07-03
NPT3EA - 36 2026-07-02
NPT5D - 7 2026-04-17
NPT5U - 4 2026-04-17
NPT9BF - 3 2026-07-07
NPT8BF - 3 2026-07-08
NPT2R - 2 2026-07-09
NPT2L - 2 2026-07-10
NPT3W - 1 2026-07-07
NPT3E - 1 2026-07-13
FX4880 - 1 2026-06-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 NPT3E - Jul 13, 23:05 UTCJul 13, 23:45 UTC40m
2026-07-10 NPT2L EMA → BFS Jul 10, 01:40 UTCJul 10, 02:20 UTC40m
2026-07-09 NPT2R - Jul 9, 22:45 UTCJul 9, 23:20 UTC35m
2026-07-08 NPT8BF EMA → BFS Jul 8, 04:25 UTCJul 8, 05:05 UTC40m
2026-07-08 NPT8BF CDG → EMA Jul 8, 01:30 UTCJul 8, 02:20 UTC50m
2026-07-07 NPT9BF EMA → CDG Jul 7, 21:45 UTCJul 7, 22:45 UTC1h 0m
2026-07-07 NPT9BF - Jul 7, 19:30 UTCJul 7, 20:10 UTC40m
2026-07-07 NPT3W EMA → BFS Jul 7, 01:35 UTCJul 7, 02:30 UTC55m
2026-07-03 NPT2EA - Jul 3, 02:00 UTCJul 3, 03:00 UTC1h 0m
2026-07-02 NPT3EA - Jul 2, 21:50 UTCJul 2, 22:40 UTC50m
2026-07-02 NPT2EA - Jul 2, 02:05 UTCJul 2, 02:55 UTC50m
2026-07-01 NPT3EA - Jul 1, 21:50 UTCJul 1, 22:50 UTC1h 0m
2026-07-01 NPT2EA - Jul 1, 02:05 UTCJul 1, 03:00 UTC55m
2026-06-30 NPT3EA - Jun 30, 21:45 UTCJun 30, 22:40 UTC55m
2026-06-30 NPT2EA - Jun 30, 02:00 UTCJun 30, 02:55 UTC55m
2026-06-29 NPT3EA - Jun 29, 22:00 UTCJun 29, 22:49 UTC50m
2026-06-26 NPT2EA - Jun 26, 01:50 UTCJun 26, 02:40 UTC50m
2026-06-25 NPT3EA EMA → LGG Jun 25, 22:45 UTCJun 25, 23:44 UTC1h 0m
2026-06-25 NPT2EA LGG → EMA Jun 25, 01:54 UTCJun 25, 02:45 UTC50m
2026-06-24 NPT3EA - Jun 24, 21:50 UTCJun 24, 22:45 UTC55m
2026-06-24 NPT2EA - Jun 24, 01:55 UTCJun 24, 02:45 UTC50m
2026-06-23 NPT3EA - Jun 23, 21:39 UTCJun 23, 22:34 UTC55m
2026-06-23 NPT2EA - Jun 23, 01:50 UTCJun 23, 02:45 UTC55m
2026-06-22 NPT3EA - Jun 22, 22:10 UTCJun 22, 23:05 UTC55m
2026-06-19 NPT2EA - Jun 19, 02:04 UTCJun 19, 02:54 UTC50m
2026-06-18 NPT2EA - Jun 18, 21:55 UTCJun 18, 23:00 UTC1h 5m
2026-06-18 NPT2EA - Jun 18, 02:05 UTCJun 18, 02:55 UTC50m
2026-06-17 NPT3EA - Jun 17, 21:55 UTCJun 17, 22:50 UTC55m
2026-06-17 NPT2EA - Jun 17, 02:00 UTCJun 17, 02:50 UTC50m
2026-06-16 NPT3EA - Jun 16, 21:55 UTCJun 16, 22:50 UTC55m
2026-06-16 NPT2EA - Jun 16, 01:50 UTCJun 16, 02:45 UTC55m
2026-06-15 NPT3EA - Jun 15, 21:50 UTCJun 15, 22:40 UTC50m
2026-06-12 NPT2EA - Jun 12, 02:50 UTCJun 12, 04:05 UTC1h 15m
2026-06-11 NPT3EA - Jun 11, 21:55 UTCJun 11, 22:50 UTC55m
2026-06-11 NPT2EA - Jun 11, 01:55 UTCJun 11, 02:55 UTC1h 0m
2026-06-10 NPT3EA - Jun 10, 21:50 UTCJun 10, 22:40 UTC50m
2026-06-10 NPT2EA - Jun 10, 02:00 UTCJun 10, 02:55 UTC55m
2026-06-09 NPT3EA - Jun 9, 21:50 UTCJun 9, 22:45 UTC55m
2026-06-09 NPT2EA - Jun 9, 01:55 UTCJun 9, 02:50 UTC55m
2026-06-08 NPT3EA - Jun 8, 22:20 UTCJun 8, 23:15 UTC55m
2026-06-08 NPT9BF - Jun 8, 19:35 UTCJun 8, 20:20 UTC45m
2026-06-05 NPT8BF EMA → BFS Jun 5, 04:30 UTCJun 5, 05:10 UTC40m
2026-06-05 NPT2EA - Jun 5, 02:05 UTCJun 5, 02:55 UTC50m
2026-06-04 NPT3EA - Jun 4, 21:55 UTCJun 4, 22:50 UTC55m
2026-06-04 NPT2EA - Jun 4, 02:10 UTCJun 4, 03:10 UTC1h 0m
2026-06-03 NPT3EA - Jun 3, 22:00 UTCJun 3, 22:55 UTC55m
2026-06-03 FX4880 - Jun 3, 00:15 UTCJun 3, 01:10 UTC55m
2026-06-01 NPT2EA EMA → LGG Jun 1, 22:05 UTCJun 1, 23:05 UTC1h 0m
2026-05-29 NPT2EA - May 29, 01:55 UTCMay 29, 02:45 UTC50m
2026-05-28 NPT3EA EMA → LGG May 28, 21:55 UTCMay 28, 22:50 UTC55m

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

Mode-S 407504 frequently asked

What is Mode-S code 407504?
407504 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-CKUZ.
Where is Mode-S 407504 registered?
Mode-S code 407504 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 407504 broadcasting right now?
No active broadcast right now. Last signal was 10h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 407504, octal 20072404, decimal 4,224,260.
What flights does 407504 operate?
Mode-S 407504 has broadcast 11 distinct callsigns, including NPT2EA, NPT3EA, NPT5D, NPT5U, NPT9BF.