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sensors Mode-S transponder

A431AF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N37CL · operated by LAMB CHRISTOPHER

Hex
A431AF
Octal
51030657
Decimal
10,760,623
Country
US
Tail
N37CL
Type
S22T
No current signal · last broadcast 1d ago
Flights observed
128
Distinct callsigns
1
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A431AF.

Country allocation

The ICAO 24-bit address A431AF falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States 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
N37CL - 128 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-12 N37CL - Jul 12, 21:40 UTCJul 12, 23:10 UTC1h 30m
2026-07-12 N37CL - Jul 12, 20:15 UTCJul 12, 21:05 UTC50m
2026-07-12 N37CL - Jul 12, 18:25 UTCJul 12, 19:30 UTC1h 5m
2026-07-12 N37CL - Jul 12, 13:01 UTCJul 12, 15:40 UTC2h 40m
2026-07-12 N37CL - Jul 12, 12:05 UTCJul 12, 12:30 UTC25m
2026-07-11 N37CL - Jul 11, 21:00 UTCJul 11, 21:10 UTC10m
2026-07-10 N37CL - Jul 10, 21:25 UTCJul 10, 21:40 UTC15m
2026-07-10 N37CL - Jul 10, 18:05 UTCJul 10, 20:50 UTC2h 45m
2026-07-10 N37CL - Jul 10, 14:10 UTCJul 10, 16:45 UTC2h 35m
2026-07-10 N37CL - Jul 10, 12:45 UTCJul 10, 13:10 UTC25m
2026-07-09 N37CL - Jul 9, 20:05 UTCJul 9, 21:05 UTC1h 0m
2026-07-09 N37CL - Jul 9, 19:05 UTCJul 9, 19:25 UTC20m
2026-07-09 N37CL - Jul 9, 00:55 UTCJul 9, 01:40 UTC45m
2026-07-08 N37CL - Jul 8, 22:10 UTCJul 8, 22:50 UTC40m
2026-07-08 N37CL - Jul 8, 19:05 UTCJul 8, 20:15 UTC1h 10m
2026-07-08 N37CL - Jul 8, 13:25 UTCJul 8, 14:35 UTC1h 10m
2026-07-05 N37CL - Jul 5, 16:25 UTCJul 5, 16:45 UTC20m
2026-07-05 N37CL - Jul 5, 15:30 UTCJul 5, 15:50 UTC20m
2026-07-05 N37CL - Jul 5, 14:10 UTCJul 5, 14:50 UTC40m
2026-07-05 N37CL - Jul 5, 12:30 UTCJul 5, 12:55 UTC25m
2026-07-03 N37CL - Jul 3, 15:05 UTCJul 3, 15:40 UTC35m
2026-07-03 N37CL - Jul 3, 00:30 UTCJul 3, 01:25 UTC55m
2026-07-02 N37CL - Jul 2, 23:05 UTCJul 2, 23:30 UTC25m
2026-07-02 N37CL - Jul 2, 20:30 UTCJul 2, 22:30 UTC2h 0m
2026-07-02 N37CL - Jul 2, 18:55 UTCJul 2, 20:25 UTC1h 30m
2026-07-02 N37CL - Jul 2, 16:05 UTCJul 2, 16:40 UTC35m
2026-07-02 N37CL - Jul 2, 13:15 UTCJul 2, 14:30 UTC1h 15m
2026-07-02 N37CL - Jul 2, 12:15 UTCJul 2, 12:40 UTC25m
2026-07-01 N37CL - Jul 1, 16:55 UTCJul 1, 17:05 UTC10m
2026-06-30 N37CL - Jun 30, 14:55 UTCJun 30, 15:05 UTC10m
2026-06-27 N37CL - Jun 27, 01:09 UTCJun 27, 01:59 UTC50m
2026-06-24 N37CL - Jun 24, 16:45 UTCJun 24, 17:10 UTC25m
2026-06-24 N37CL - Jun 24, 13:54 UTCJun 24, 14:15 UTC20m
2026-06-22 N37CL - Jun 22, 18:40 UTCJun 22, 18:49 UTC10m
2026-06-21 N37CL - Jun 21, 16:39 UTCJun 21, 16:49 UTC10m
2026-06-20 N37CL - Jun 20, 16:29 UTCJun 20, 16:49 UTC20m
2026-06-19 N37CL - Jun 19, 15:44 UTCJun 19, 15:54 UTC10m
2026-06-18 N37CL - Jun 18, 12:15 UTCJun 18, 12:30 UTC15m
2026-06-16 N37CL - Jun 16, 16:55 UTCJun 16, 17:30 UTC35m
2026-06-16 N37CL - Jun 16, 12:50 UTCJun 16, 13:34 UTC45m
2026-06-15 N37CL - Jun 15, 20:15 UTCJun 15, 20:25 UTC10m
2026-06-13 N37CL - Jun 13, 20:55 UTCJun 13, 23:25 UTC2h 30m
2026-06-13 N37CL - Jun 13, 14:45 UTCJun 13, 15:20 UTC35m
2026-06-13 N37CL - Jun 13, 13:15 UTCJun 13, 14:40 UTC1h 25m
2026-06-13 N37CL - Jun 13, 12:25 UTCJun 13, 12:40 UTC15m
2026-06-12 N37CL - Jun 12, 20:10 UTCJun 12, 20:30 UTC20m
2026-06-08 N37CL - Jun 8, 20:00 UTCJun 8, 23:00 UTC3h 0m
2026-06-08 N37CL - Jun 8, 18:40 UTCJun 8, 19:00 UTC20m
2026-06-08 N37CL - Jun 8, 12:05 UTCJun 8, 15:04 UTC3h 0m
2026-06-07 N37CL TEB → BDR Jun 7, 19:45 UTCJun 7, 20:10 UTC25m

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 N37CL page for operator, model, and routing details .

Mode-S A431AF frequently asked

What is Mode-S code A431AF?
A431AF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N37CL.
Where is Mode-S A431AF registered?
Mode-S code A431AF is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is A431AF broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A431AF, octal 51030657, decimal 10,760,623.
What flights does A431AF operate?
Mode-S A431AF has broadcast 1 distinct callsign, including N37CL.