Apparatus

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sensors Mode-S transponder

A437CF

ICAO 24-bit transponder address · allocated to United States

Hex
A437CF
Octal
51033717
Decimal
10,762,191
Country
US
No current signal · last broadcast 21h ago
Flights observed
167
Distinct callsigns
2
Country
US
Last broadcast
21h ago

Last known position

Most recent position reported by Mode-S A437CF.

Country allocation

The ICAO 24-bit address A437CF 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 2 distinct

Callsign Airline Flights Last seen
KOW371 - 166 2026-07-13
N371DB - 1 2026-05-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 KOW371 LUK → RDU Jul 13, 18:50 UTCJul 13, 19:55 UTC1h 5m
2026-07-13 KOW371 - Jul 13, 16:15 UTCJul 13, 16:40 UTC25m
2026-07-13 KOW371 - Jul 13, 13:35 UTCJul 13, 15:40 UTC2h 5m
2026-07-12 KOW371 - Jul 12, 18:25 UTCJul 12, 23:05 UTC4h 40m
2026-07-12 KOW371 VNY → LAS Jul 12, 01:25 UTCJul 12, 02:05 UTC40m
2026-07-11 KOW371 - Jul 11, 15:05 UTCJul 11, 20:45 UTC5h 40m
2026-07-10 KOW371 - Jul 10, 19:25 UTCJul 10, 19:55 UTC30m
2026-07-10 KOW371 - Jul 10, 16:30 UTCJul 10, 18:55 UTC2h 25m
2026-07-10 KOW371 - Jul 10, 01:15 UTCJul 10, 02:00 UTC45m
2026-07-09 KOW371 YVR → FLL Jul 9, 15:35 UTCJul 10, 00:15 UTC8h 40m
2026-07-08 KOW371 - Jul 8, 21:40 UTCJul 8, 23:20 UTC1h 40m
2026-07-07 KOW371 - Jul 7, 20:20 UTCJul 7, 20:50 UTC30m
2026-07-07 KOW371 - Jul 7, 19:10 UTCJul 7, 19:50 UTC40m
2026-07-06 KOW371 - Jul 6, 20:50 UTCJul 6, 21:10 UTC20m
2026-07-06 KOW371 - Jul 6, 15:10 UTCJul 6, 19:40 UTC4h 30m
2026-07-05 KOW371 - Jul 5, 21:25 UTCJul 5, 21:35 UTC10m
2026-07-05 KOW371 - Jul 5, 16:45 UTCJul 5, 19:10 UTC2h 25m
2026-07-04 KOW371 - Jul 4, 19:05 UTCJul 4, 19:30 UTC25m
2026-07-02 KOW371 VNY → TEB Jul 2, 19:15 UTCJul 3, 00:05 UTC4h 50m
2026-07-02 KOW371 CLD → VNY Jul 2, 17:25 UTCJul 2, 17:55 UTC30m
2026-07-01 KOW371 - Jul 1, 22:45 UTCJul 2, 04:05 UTC5h 20m
2026-07-01 KOW371 - Jul 1, 19:55 UTCJul 1, 20:30 UTC35m
2026-07-01 KOW371 - Jul 1, 16:25 UTCJul 1, 18:55 UTC2h 30m
2026-07-01 KOW371 - Jul 1, 01:10 UTCJul 1, 03:50 UTC2h 40m
2026-06-30 KOW371 - Jun 30, 21:40 UTCJul 1, 00:15 UTC2h 35m
2026-06-29 KOW371 - Jun 29, 02:00 UTCJun 29, 02:20 UTC20m
2026-06-28 KOW371 VNY → MRK Jun 28, 20:19 UTCJun 29, 00:54 UTC4h 35m
2026-06-28 KOW371 SJC → VNY Jun 28, 04:55 UTCJun 28, 05:40 UTC45m
2026-06-27 KOW371 - Jun 27, 22:49 UTCJun 27, 23:39 UTC50m
2026-06-27 KOW371 - Jun 27, 20:09 UTCJun 27, 20:59 UTC50m
2026-06-27 KOW371 - Jun 27, 03:30 UTCJun 27, 04:05 UTC35m
2026-06-26 KOW371 - Jun 26, 21:24 UTCJun 27, 01:59 UTC4h 35m
2026-06-25 KOW371 - Jun 25, 17:54 UTCJun 25, 20:30 UTC2h 35m
2026-06-25 KOW371 - Jun 25, 14:24 UTCJun 25, 17:05 UTC2h 40m
2026-06-24 KOW371 - Jun 24, 22:55 UTCJun 24, 23:24 UTC30m
2026-06-24 KOW371 - Jun 24, 17:29 UTCJun 24, 21:54 UTC4h 25m
2026-06-23 KOW371 - Jun 23, 19:24 UTCJun 23, 23:10 UTC3h 45m
2026-06-23 KOW371 SJC → SBA Jun 23, 05:00 UTCJun 23, 05:39 UTC40m
2026-06-23 KOW371 HSH → SJC Jun 23, 03:04 UTCJun 23, 04:05 UTC1h 0m
2026-06-23 KOW371 SJC → HSH Jun 23, 00:04 UTCJun 23, 01:10 UTC1h 5m
2026-06-21 KOW371 BUR → SJC Jun 21, 22:54 UTCJun 21, 23:44 UTC50m
2026-06-21 KOW371 TEB → BUR Jun 21, 15:59 UTCJun 21, 21:49 UTC5h 50m
2026-06-20 KOW371 VNY → TEB Jun 20, 19:24 UTCJun 20, 23:59 UTC4h 35m
2026-06-19 KOW371 IAD → VNY Jun 19, 19:29 UTCJun 20, 00:54 UTC5h 25m
2026-06-19 KOW371 - Jun 19, 17:14 UTCJun 19, 18:20 UTC1h 5m
2026-06-19 KOW371 MSP → HVN Jun 19, 00:05 UTCJun 19, 02:14 UTC2h 9m
2026-06-18 KOW371 - Jun 18, 14:35 UTCJun 18, 17:25 UTC2h 50m
2026-06-17 KOW371 - Jun 17, 23:40 UTCJun 18, 00:05 UTC25m
2026-06-17 KOW371 VNY → EWB Jun 17, 17:15 UTCJun 17, 22:25 UTC5h 10m
2026-06-16 KOW371 - Jun 16, 21:45 UTCJun 16, 22:05 UTC20m

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.

Mode-S A437CF frequently asked

What is Mode-S code A437CF?
A437CF is an ICAO 24-bit transponder address. Allocated to United States.
Where is Mode-S A437CF registered?
Mode-S code A437CF 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 A437CF broadcasting right now?
No active broadcast right now. Last signal was 21h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A437CF, octal 51033717, decimal 10,762,191.
What flights does A437CF operate?
Mode-S A437CF has broadcast 2 distinct callsigns, including KOW371, N371DB.