Apparatus

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sensors Mode-S transponder

40761A

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-NPTX · BOEING 737-400

Hex
40761A
Octal
20073032
Decimal
4,224,538
Country
GB
Tail
G-NPTX
Type
B734
No current signal · last broadcast 9h ago
Flights observed
73
Distinct callsigns
11
Country
GB
Last broadcast
9h ago

Last known position

Most recent position reported by Mode-S 40761A.

Country allocation

The ICAO 24-bit address 40761A 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
NPT5U - 23 2026-07-14
NPT5D - 20 2026-07-10
NPT3EA - 6 2026-05-22
NPT2R - 5 2026-06-01
NPT2L - 5 2026-06-02
NPT2EA - 5 2026-05-26
00000000 - 5 2026-07-07
NPT734P - 1 2026-04-21
NPT5P - 1 2026-06-22
NPT3W - 1 2026-06-27
NPT3E - 1 2026-06-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 NPT5U EMA → EDI Jul 14, 01:20 UTCJul 14, 02:00 UTC40m
2026-07-13 NPT5U EDI → EMA Jul 13, 22:50 UTCJul 13, 23:30 UTC40m
2026-07-11 NPT5U EMA → EDI Jul 11, 01:25 UTCJul 11, 02:05 UTC40m
2026-07-10 NPT5D EDI → EMA Jul 10, 23:00 UTCJul 10, 23:40 UTC40m
2026-07-10 NPT5U EMA → EDI Jul 10, 01:30 UTCJul 10, 02:10 UTC40m
2026-07-09 NPT5D EDI → EMA Jul 9, 22:40 UTCJul 9, 23:20 UTC40m
2026-07-09 NPT5U EMA → EDI Jul 9, 01:20 UTCJul 9, 02:00 UTC40m
2026-07-08 NPT5D EDI → EMA Jul 8, 22:45 UTCJul 8, 23:30 UTC45m
2026-07-08 NPT5U EMA → EDI Jul 8, 01:25 UTCJul 8, 02:15 UTC50m
2026-07-07 NPT5D EDI → EMA Jul 7, 22:50 UTCJul 7, 23:35 UTC45m
2026-07-07 00000000 EMA → EDI Jul 7, 01:25 UTCJul 7, 02:10 UTC45m
2026-07-06 00000000 EDI → EMA Jul 6, 23:00 UTCJul 6, 23:35 UTC35m
2026-07-04 NPT5U EMA → EDI Jul 4, 01:15 UTCJul 4, 02:00 UTC45m
2026-07-02 NPT5D EDI → EMA Jul 2, 23:00 UTCJul 2, 23:45 UTC45m
2026-07-02 00000000 EMA → EDI Jul 2, 01:25 UTCJul 2, 02:15 UTC50m
2026-06-29 00000000 - Jun 29, 22:10 UTCJun 29, 22:49 UTC40m
2026-06-27 NPT3W EMA → BFS Jun 27, 01:35 UTCJun 27, 02:09 UTC35m
2026-06-26 NPT5D EDI → EMA Jun 26, 22:55 UTCJun 26, 23:39 UTC45m
2026-06-26 NPT5U EMA → EDI Jun 26, 01:24 UTCJun 26, 02:09 UTC45m
2026-06-25 NPT5D EDI → EMA Jun 25, 22:59 UTCJun 25, 23:39 UTC40m
2026-06-25 NPT5U EMA → EDI Jun 25, 01:30 UTCJun 25, 02:10 UTC40m
2026-06-24 NPT5D EDI → EMA Jun 24, 22:49 UTCJun 24, 23:29 UTC40m
2026-06-24 NPT5U EMA → EDI Jun 24, 01:24 UTCJun 24, 02:09 UTC45m
2026-06-23 NPT5D EDI → EMA Jun 23, 22:55 UTCJun 23, 23:34 UTC40m
2026-06-23 NPT5U EMA → EDI Jun 23, 01:30 UTCJun 23, 02:09 UTC40m
2026-06-22 NPT5D EDI → EMA Jun 22, 23:50 UTCJun 23, 00:24 UTC35m
2026-06-22 NPT5P EMA → EDI Jun 22, 20:44 UTCJun 22, 21:25 UTC40m
2026-06-19 00000000 EMA → EMA Jun 19, 09:09 UTCJun 19, 09:30 UTC20m
2026-06-17 NPT5D EDI → EMA Jun 17, 22:55 UTCJun 17, 23:35 UTC40m
2026-06-17 NPT5U EMA → EDI Jun 17, 01:30 UTCJun 17, 02:10 UTC40m
2026-06-16 NPT5D EDI → EMA Jun 16, 22:55 UTCJun 16, 23:40 UTC45m
2026-06-16 NPT5U EMA → EDI Jun 16, 01:35 UTCJun 16, 02:15 UTC40m
2026-06-15 NPT5D EDI → EMA Jun 15, 22:49 UTCJun 15, 23:35 UTC45m
2026-06-13 NPT5U EMA → EDI Jun 13, 01:20 UTCJun 13, 02:05 UTC45m
2026-06-08 NPT5D EDI → EMA Jun 8, 23:00 UTCJun 8, 23:45 UTC45m
2026-06-06 NPT5U EMA → EDI Jun 6, 01:30 UTCJun 6, 02:10 UTC40m
2026-06-02 NPT3E - Jun 2, 22:50 UTCJun 2, 23:30 UTC40m
2026-06-02 NPT2L EMA → BFS Jun 2, 00:20 UTCJun 2, 01:10 UTC50m
2026-06-01 NPT2R - Jun 1, 22:10 UTCJun 1, 22:55 UTC45m
2026-05-30 NPT2L EMA → BFS May 30, 01:25 UTCMay 30, 02:06 UTC41m
2026-05-26 NPT2EA - May 26, 02:04 UTCMay 26, 03:00 UTC55m
2026-05-22 NPT3EA EMA → LGG May 22, 05:05 UTCMay 22, 06:00 UTC55m
2026-05-22 NPT2EA - May 22, 01:55 UTCMay 22, 02:50 UTC55m
2026-05-21 NPT3EA EMA → LGG May 21, 21:50 UTCMay 21, 22:50 UTC1h 0m
2026-05-14 NPT2R - May 14, 22:10 UTCMay 14, 22:55 UTC45m
2026-05-14 NPT2R EMA → BFS May 14, 01:15 UTCMay 14, 01:55 UTC40m
2026-05-13 NPT2R - May 13, 22:15 UTCMay 13, 22:55 UTC40m
2026-05-13 NPT2L EMA → BFS May 13, 00:15 UTCMay 13, 01:00 UTC45m
2026-05-12 NPT2R - May 12, 22:15 UTCMay 12, 22:55 UTC40m
2026-05-11 NPT2L - May 11, 22:15 UTCMay 11, 22:35 UTC19m

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

Mode-S 40761A frequently asked

What is Mode-S code 40761A?
40761A is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-NPTX.
Where is Mode-S 40761A registered?
Mode-S code 40761A 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 40761A 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 40761A, octal 20073032, decimal 4,224,538.
What flights does 40761A operate?
Mode-S 40761A has broadcast 11 distinct callsigns, including NPT5U, NPT5D, NPT3EA, NPT2R, NPT2L.