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sensors Mode-S transponder

AB1B19

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N81437 · BEECH 90 King Air · operated by SOLOMON MARK TRUSTEE

Hex
AB1B19
Octal
52615431
Decimal
11,213,593
Country
US
Tail
N81437
Type
BE9L
No current signal · last broadcast Jul 24, 17:45 UTC
Flights observed
22
Distinct callsigns
1
Country
US
Last broadcast
Jul 24, 17:45 UTC

Last known position

Most recent position reported by Mode-S AB1B19.

Country allocation

The ICAO 24-bit address AB1B19 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
N81437 - 22 2026-07-24

Recent flights last 22

DateFlightRouteTakeoffLandingDuration
2026-07-24 N81437 - Jul 24, 17:05 UTCJul 24, 17:45 UTC40m
2026-07-24 N81437 - Jul 24, 15:05 UTCJul 24, 15:45 UTC40m
2026-07-23 N81437 - Jul 23, 21:40 UTCJul 23, 22:05 UTC25m
2026-07-22 N81437 - Jul 22, 16:15 UTCJul 22, 16:55 UTC40m
2026-07-22 N81437 - Jul 22, 15:20 UTCJul 22, 15:35 UTC15m
2026-07-22 N81437 - Jul 22, 14:00 UTCJul 22, 14:40 UTC40m
2026-07-22 N81437 - Jul 22, 11:30 UTCJul 22, 11:55 UTC25m
2026-07-21 N81437 - Jul 21, 21:35 UTCJul 21, 22:10 UTC35m
2026-07-21 N81437 - Jul 21, 19:05 UTCJul 21, 20:10 UTC1h 5m
2026-07-18 N81437 - Jul 18, 12:55 UTCJul 18, 13:35 UTC40m
2026-07-18 N81437 - Jul 18, 11:25 UTCJul 18, 12:00 UTC35m
2026-07-17 N81437 - Jul 17, 19:05 UTCJul 17, 19:30 UTC25m
2026-07-17 N81437 - Jul 17, 16:40 UTCJul 17, 17:09 UTC30m
2026-06-18 N81437 - Jun 18, 21:20 UTCJun 18, 21:50 UTC30m
2026-06-17 N81437 - Jun 17, 12:35 UTCJun 17, 13:10 UTC35m
2026-05-26 N81437 - May 26, 01:20 UTCMay 26, 02:00 UTC40m
2026-05-25 N81437 - May 25, 13:00 UTCMay 25, 13:10 UTC10m
2026-05-18 N81437 - May 18, 14:00 UTCMay 18, 14:30 UTC30m
2026-05-15 N81437 - May 15, 17:20 UTCMay 15, 17:50 UTC30m
2026-04-25 N81437 - Apr 25, 18:50 UTCApr 25, 19:05 UTC15m
2026-04-24 N81437 - Apr 24, 13:10 UTCApr 24, 13:25 UTC15m
2026-04-23 N81437 - Apr 23, 16:10 UTCApr 23, 16:35 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 N81437 page for operator, model, and routing details .

Mode-S AB1B19 frequently asked

What is Mode-S code AB1B19?
AB1B19 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N81437.
Where is Mode-S AB1B19 registered?
Mode-S code AB1B19 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 AB1B19 broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 17:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AB1B19, octal 52615431, decimal 11,213,593.
What flights does AB1B19 operate?
Mode-S AB1B19 has broadcast 1 distinct callsign, including N81437.