Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A181DE

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N19673 · CESSNA 172 Skyhawk · operated by TRANSAIR INC

Hex
A181DE
Octal
50300736
Decimal
10,584,542
Country
US
Tail
N19673
Type
C172
No current signal · last broadcast Jul 26, 18:50 UTC
Flights observed
76
Distinct callsigns
1
Country
US
Last broadcast
Jul 26, 18:50 UTC

Last known position

Most recent position reported by Mode-S A181DE.

Country allocation

The ICAO 24-bit address A181DE 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
N19673 - 76 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N19673 - Jul 26, 18:35 UTCJul 26, 18:50 UTC15m
2026-07-25 N19673 - Jul 25, 14:35 UTCJul 25, 14:55 UTC20m
2026-07-22 N19673 - Jul 22, 15:45 UTCJul 22, 16:05 UTC20m
2026-07-22 N19673 - Jul 22, 00:30 UTCJul 22, 01:35 UTC1h 5m
2026-07-21 N19673 - Jul 21, 18:35 UTCJul 21, 19:25 UTC50m
2026-07-21 N19673 - Jul 21, 17:15 UTCJul 21, 17:25 UTC10m
2026-07-21 N19673 - Jul 21, 16:35 UTCJul 21, 16:45 UTC10m
2026-07-20 N19673 - Jul 20, 15:10 UTCJul 20, 15:45 UTC35m
2026-07-20 N19673 - Jul 20, 14:25 UTCJul 20, 14:40 UTC15m
2026-07-17 N19673 - Jul 17, 14:55 UTCJul 17, 15:05 UTC10m
2026-07-16 N19673 - Jul 16, 15:25 UTCJul 16, 15:40 UTC15m
2026-07-16 N19673 - Jul 16, 14:15 UTCJul 16, 14:45 UTC30m
2026-07-10 N19673 - Jul 10, 13:45 UTCJul 10, 14:30 UTC45m
2026-07-09 N19673 - Jul 9, 14:25 UTCJul 9, 15:35 UTC1h 10m
2026-07-08 N19673 - Jul 8, 16:30 UTCJul 8, 17:20 UTC50m
2026-07-08 N19673 - Jul 8, 13:30 UTCJul 8, 14:25 UTC55m
2026-07-07 N19673 - Jul 7, 18:15 UTCJul 7, 18:50 UTC35m
2026-07-07 N19673 - Jul 7, 14:50 UTCJul 7, 15:40 UTC50m
2026-07-06 N19673 - Jul 6, 18:25 UTCJul 6, 18:35 UTC10m
2026-07-06 N19673 - Jul 6, 17:30 UTCJul 6, 17:40 UTC10m
2026-07-06 N19673 - Jul 6, 15:55 UTCJul 6, 16:40 UTC45m
2026-07-06 N19673 - Jul 6, 13:30 UTCJul 6, 14:45 UTC1h 15m
2026-07-02 N19673 - Jul 2, 14:45 UTCJul 2, 15:00 UTC15m
2026-07-01 N19673 - Jul 1, 16:00 UTCJul 1, 16:15 UTC15m
2026-07-01 N19673 - Jul 1, 13:50 UTCJul 1, 15:20 UTC1h 30m
2026-06-29 N19673 - Jun 29, 14:19 UTCJun 29, 14:39 UTC20m
2026-06-27 N19673 - Jun 27, 16:24 UTCJun 27, 16:35 UTC10m
2026-06-26 N19673 - Jun 26, 14:15 UTCJun 26, 14:59 UTC45m
2026-06-25 N19673 - Jun 25, 13:24 UTCJun 25, 14:29 UTC1h 5m
2026-06-24 N19673 - Jun 24, 18:55 UTCJun 24, 19:44 UTC50m
2026-06-24 N19673 - Jun 24, 16:45 UTCJun 24, 17:10 UTC25m
2026-06-24 N19673 - Jun 24, 14:39 UTCJun 24, 14:50 UTC10m
2026-06-22 N19673 - Jun 22, 15:14 UTCJun 22, 15:29 UTC15m
2026-06-20 N19673 - Jun 20, 16:49 UTCJun 20, 17:34 UTC45m
2026-06-17 N19673 - Jun 17, 17:30 UTCJun 17, 18:00 UTC30m
2026-06-17 N19673 - Jun 17, 16:15 UTCJun 17, 16:50 UTC35m
2026-06-16 N19673 - Jun 16, 17:45 UTCJun 16, 17:55 UTC10m
2026-06-16 N19673 - Jun 16, 16:50 UTCJun 16, 17:00 UTC10m
2026-06-12 N19673 - Jun 12, 16:05 UTCJun 12, 16:35 UTC30m
2026-06-09 N19673 - Jun 9, 19:30 UTCJun 9, 19:45 UTC15m
2026-06-06 N19673 - Jun 6, 16:20 UTCJun 6, 17:05 UTC45m
2026-06-06 N19673 - Jun 6, 14:34 UTCJun 6, 14:50 UTC15m
2026-06-05 N19673 - Jun 5, 23:55 UTCJun 6, 00:40 UTC45m
2026-06-05 N19673 - Jun 5, 13:20 UTCJun 5, 14:10 UTC50m
2026-06-04 N19673 - Jun 4, 19:45 UTCJun 4, 20:15 UTC30m
2026-06-04 N19673 - Jun 4, 18:10 UTCJun 4, 18:40 UTC30m
2026-06-04 N19673 - Jun 4, 15:45 UTCJun 4, 17:05 UTC1h 20m
2026-06-03 N19673 - Jun 3, 19:10 UTCJun 3, 20:35 UTC1h 25m
2026-06-03 N19673 - Jun 3, 17:05 UTCJun 3, 18:10 UTC1h 5m
2026-06-03 N19673 - Jun 3, 16:05 UTCJun 3, 16:30 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 N19673 page for operator, model, and routing details .

Mode-S A181DE frequently asked

What is Mode-S code A181DE?
A181DE is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N19673.
Where is Mode-S A181DE registered?
Mode-S code A181DE 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 A181DE broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 18:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A181DE, octal 50300736, decimal 10,584,542.
What flights does A181DE operate?
Mode-S A181DE has broadcast 1 distinct callsign, including N19673.