Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A1B23F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N2081J · CESSNA 172R Cutlass RG · operated by WINGS OVER TEXAS HOLDINGS LLC

Hex
A1B23F
Octal
50331077
Decimal
10,596,927
Country
US
Tail
N2081J
Type
C72R
No current signal · last broadcast Jul 23, 20:30 UTC
Flights observed
121
Distinct callsigns
1
Country
US
Last broadcast
Jul 23, 20:30 UTC

Last known position

Most recent position reported by Mode-S A1B23F.

Country allocation

The ICAO 24-bit address A1B23F 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
N2081J - 121 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 N2081J - Jul 23, 19:40 UTCJul 23, 20:30 UTC50m
2026-07-23 N2081J - Jul 23, 17:55 UTCJul 23, 18:40 UTC45m
2026-07-22 N2081J - Jul 22, 22:55 UTCJul 23, 00:45 UTC1h 50m
2026-07-22 N2081J - Jul 22, 19:50 UTCJul 22, 21:20 UTC1h 30m
2026-07-22 N2081J - Jul 22, 16:40 UTCJul 22, 16:50 UTC10m
2026-07-22 N2081J - Jul 22, 12:15 UTCJul 22, 14:35 UTC2h 20m
2026-07-22 N2081J - Jul 22, 02:15 UTCJul 22, 03:20 UTC1h 5m
2026-07-21 N2081J - Jul 21, 19:30 UTCJul 21, 21:00 UTC1h 30m
2026-07-21 N2081J - Jul 21, 15:50 UTCJul 21, 17:10 UTC1h 20m
2026-07-20 N2081J - Jul 20, 23:55 UTCJul 21, 01:15 UTC1h 20m
2026-07-20 N2081J - Jul 20, 17:15 UTCJul 20, 18:30 UTC1h 15m
2026-07-20 N2081J - Jul 20, 14:30 UTCJul 20, 16:00 UTC1h 30m
2026-07-19 N2081J - Jul 19, 18:30 UTCJul 19, 19:40 UTC1h 10m
2026-07-19 N2081J - Jul 19, 14:15 UTCJul 19, 15:30 UTC1h 15m
2026-07-19 N2081J - Jul 19, 11:45 UTCJul 19, 13:15 UTC1h 30m
2026-07-18 N2081J - Jul 18, 22:15 UTCJul 18, 22:25 UTC10m
2026-07-18 N2081J - Jul 18, 19:25 UTCJul 18, 21:00 UTC1h 35m
2026-07-18 N2081J - Jul 18, 14:40 UTCJul 18, 16:05 UTC1h 25m
2026-07-17 N2081J - Jul 17, 20:35 UTCJul 17, 21:39 UTC1h 5m
2026-07-17 N2081J - Jul 17, 14:04 UTCJul 17, 15:55 UTC1h 50m
2026-07-16 N2081J - Jul 16, 13:00 UTCJul 16, 13:15 UTC15m
2026-07-16 N2081J - Jul 16, 02:05 UTCJul 16, 02:50 UTC45m
2026-07-16 N2081J - Jul 16, 00:45 UTCJul 16, 01:25 UTC40m
2026-07-15 N2081J - Jul 15, 19:25 UTCJul 15, 20:10 UTC45m
2026-07-15 N2081J - Jul 15, 15:10 UTCJul 15, 16:20 UTC1h 10m
2026-07-14 N2081J - Jul 14, 18:00 UTCJul 14, 19:05 UTC1h 5m
2026-07-14 N2081J - Jul 14, 15:10 UTCJul 14, 16:35 UTC1h 25m
2026-07-12 N2081J - Jul 12, 18:35 UTCJul 12, 19:50 UTC1h 15m
2026-07-11 N2081J - Jul 11, 23:20 UTCJul 12, 00:55 UTC1h 35m
2026-07-11 N2081J - Jul 11, 20:20 UTCJul 11, 21:40 UTC1h 20m
2026-07-11 N2081J - Jul 11, 18:10 UTCJul 11, 19:10 UTC1h 0m
2026-07-11 N2081J - Jul 11, 14:35 UTCJul 11, 15:55 UTC1h 20m
2026-07-10 N2081J - Jul 10, 21:40 UTCJul 10, 23:05 UTC1h 25m
2026-07-10 N2081J - Jul 10, 19:30 UTCJul 10, 20:10 UTC40m
2026-07-10 N2081J - Jul 10, 17:00 UTCJul 10, 18:10 UTC1h 10m
2026-07-10 N2081J - Jul 10, 13:10 UTCJul 10, 14:55 UTC1h 45m
2026-07-09 N2081J - Jul 9, 12:30 UTCJul 9, 14:05 UTC1h 35m
2026-07-09 N2081J - Jul 9, 02:45 UTCJul 9, 04:25 UTC1h 40m
2026-07-08 N2081J - Jul 8, 23:00 UTCJul 9, 00:25 UTC1h 25m
2026-07-08 N2081J - Jul 8, 19:40 UTCJul 8, 21:10 UTC1h 30m
2026-07-08 N2081J - Jul 8, 03:40 UTCJul 8, 05:00 UTC1h 20m
2026-07-07 N2081J - Jul 7, 20:25 UTCJul 7, 22:15 UTC1h 50m
2026-07-07 N2081J - Jul 7, 17:40 UTCJul 7, 19:20 UTC1h 40m
2026-07-07 N2081J - Jul 7, 11:40 UTCJul 7, 13:10 UTC1h 30m
2026-07-07 N2081J - Jul 7, 00:00 UTCJul 7, 01:15 UTC1h 15m
2026-07-06 N2081J - Jul 6, 19:45 UTCJul 6, 21:10 UTC1h 25m
2026-07-06 N2081J - Jul 6, 14:55 UTCJul 6, 17:05 UTC2h 10m
2026-07-06 N2081J - Jul 6, 11:45 UTCJul 6, 12:40 UTC55m
2026-07-05 N2081J - Jul 5, 16:30 UTCJul 5, 16:55 UTC25m
2026-07-05 N2081J - Jul 5, 15:30 UTCJul 5, 15:50 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.

Prefer a tail-number view? See the N2081J page for operator, model, and routing details .

Mode-S A1B23F frequently asked

What is Mode-S code A1B23F?
A1B23F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N2081J.
Where is Mode-S A1B23F registered?
Mode-S code A1B23F 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 A1B23F broadcasting right now?
No active broadcast right now. Last signal was Jul 23, 20:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1B23F, octal 50331077, decimal 10,596,927.
What flights does A1B23F operate?
Mode-S A1B23F has broadcast 1 distinct callsign, including N2081J.