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sensors Mode-S transponder

A09BBD

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N1383U · CESSNA 172 Skyhawk

Hex
A09BBD
Octal
50115675
Decimal
10,525,629
Country
US
Tail
N1383U
Type
C172
No current signal · last broadcast 4d ago
Flights observed
97
Distinct callsigns
1
Country
US
Last broadcast
4d ago

Last known position

Most recent position reported by Mode-S A09BBD.

Country allocation

The ICAO 24-bit address A09BBD 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
N1383U - 97 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 N1383U - Jul 14, 00:00 UTCJul 14, 00:35 UTC35m
2026-07-10 N1383U - Jul 10, 22:15 UTCJul 10, 23:25 UTC1h 10m
2026-07-08 N1383U PAE → PAE Jul 8, 23:20 UTCJul 9, 00:30 UTC1h 10m
2026-07-07 N1383U - Jul 7, 01:20 UTCJul 7, 01:50 UTC30m
2026-07-06 N1383U - Jul 6, 21:10 UTCJul 6, 21:40 UTC30m
2026-07-06 N1383U PAE → PAE Jul 6, 17:45 UTCJul 6, 18:40 UTC55m
2026-07-06 N1383U - Jul 6, 06:20 UTCJul 6, 07:10 UTC50m
2026-07-03 N1383U - Jul 3, 23:35 UTCJul 4, 00:00 UTC25m
2026-07-03 N1383U - Jul 3, 22:50 UTCJul 3, 23:00 UTC10m
2026-07-03 N1383U - Jul 3, 20:35 UTCJul 3, 20:50 UTC15m
2026-07-03 N1383U - Jul 3, 19:45 UTCJul 3, 20:10 UTC25m
2026-06-28 N1383U - Jun 28, 22:45 UTCJun 28, 23:20 UTC35m
2026-06-25 N1383U - Jun 25, 22:24 UTCJun 26, 00:10 UTC1h 45m
2026-06-24 N1383U - Jun 24, 02:09 UTCJun 24, 03:04 UTC55m
2026-06-23 N1383U - Jun 23, 23:50 UTCJun 24, 00:34 UTC45m
2026-06-23 N1383U TWD → PAE Jun 23, 19:19 UTCJun 23, 19:39 UTC20m
2026-06-23 N1383U - Jun 23, 17:50 UTCJun 23, 18:10 UTC20m
2026-06-23 N1383U - Jun 23, 16:50 UTCJun 23, 17:25 UTC35m
2026-06-23 N1383U ESD → PAE Jun 23, 03:39 UTCJun 23, 04:45 UTC1h 5m
2026-06-23 N1383U TWD → ESD Jun 23, 01:04 UTCJun 23, 01:35 UTC30m
2026-06-23 N1383U - Jun 23, 00:00 UTCJun 23, 00:19 UTC20m
2026-06-22 N1383U - Jun 22, 22:44 UTCJun 22, 22:59 UTC15m
2026-06-22 N1383U - Jun 22, 18:00 UTCJun 22, 18:40 UTC40m
2026-06-22 N1383U - Jun 22, 15:05 UTCJun 22, 15:50 UTC45m
2026-06-22 N1383U RCE → PAE Jun 22, 01:44 UTCJun 22, 02:25 UTC40m
2026-06-21 N1383U - Jun 21, 20:00 UTCJun 21, 20:45 UTC45m
2026-06-21 N1383U - Jun 21, 04:14 UTCJun 21, 04:39 UTC25m
2026-06-21 N1383U - Jun 21, 02:50 UTCJun 21, 03:10 UTC20m
2026-06-20 N1383U - Jun 20, 21:55 UTCJun 20, 23:14 UTC1h 20m
2026-06-19 N1383U - Jun 19, 20:29 UTCJun 19, 21:39 UTC1h 10m
2026-06-17 N1383U - Jun 17, 23:10 UTCJun 17, 23:25 UTC15m
2026-06-17 N1383U - Jun 17, 22:00 UTCJun 17, 22:20 UTC20m
2026-06-13 N1383U - Jun 13, 17:05 UTCJun 13, 18:30 UTC1h 25m
2026-06-12 N1383U - Jun 12, 22:00 UTCJun 12, 22:35 UTC35m
2026-06-12 N1383U - Jun 12, 18:45 UTCJun 12, 19:20 UTC35m
2026-06-11 N1383U - Jun 11, 22:35 UTCJun 11, 22:55 UTC20m
2026-06-11 N1383U - Jun 11, 21:30 UTCJun 11, 21:45 UTC15m
2026-06-11 N1383U - Jun 11, 20:25 UTCJun 11, 20:40 UTC15m
2026-06-11 N1383U - Jun 11, 17:40 UTCJun 11, 18:45 UTC1h 5m
2026-06-11 N1383U PAE → PAE Jun 11, 02:45 UTCJun 11, 03:10 UTC25m
2026-06-10 N1383U - Jun 10, 22:05 UTCJun 10, 23:10 UTC1h 5m
2026-06-07 N1383U - Jun 7, 23:25 UTCJun 8, 00:15 UTC50m
2026-06-07 N1383U - Jun 7, 21:30 UTCJun 7, 22:20 UTC50m
2026-06-07 N1383U - Jun 7, 19:10 UTCJun 7, 20:25 UTC1h 15m
2026-06-06 N1383U - Jun 6, 23:05 UTCJun 6, 23:24 UTC20m
2026-06-06 N1383U - Jun 6, 22:00 UTCJun 6, 22:20 UTC20m
2026-06-06 N1383U - Jun 6, 21:04 UTCJun 6, 21:25 UTC20m
2026-06-06 N1383U - Jun 6, 19:24 UTCJun 6, 19:44 UTC20m
2026-06-06 N1383U - Jun 6, 18:09 UTCJun 6, 18:35 UTC25m
2026-06-03 N1383U ESD → PAE Jun 3, 01:40 UTCJun 3, 02:20 UTC40m

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 N1383U page for operator, model, and routing details .

Mode-S A09BBD frequently asked

What is Mode-S code A09BBD?
A09BBD is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N1383U.
Where is Mode-S A09BBD registered?
Mode-S code A09BBD 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 A09BBD broadcasting right now?
No active broadcast right now. Last signal was 4d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A09BBD, octal 50115675, decimal 10,525,629.
What flights does A09BBD operate?
Mode-S A09BBD has broadcast 1 distinct callsign, including N1383U.