Apparatus

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sensors Mode-S transponder

A12B21

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N1745S · CESSNA 172 Skyhawk · operated by CAREER PILOT TRAINING LLC

Hex
A12B21
Octal
50225441
Decimal
10,562,337
Country
US
Tail
N1745S
Type
C172
No current signal · last broadcast Jul 25, 14:10 UTC
Flights observed
128
Distinct callsigns
1
Country
US
Last broadcast
Jul 25, 14:10 UTC

Last known position

Most recent position reported by Mode-S A12B21.

Country allocation

The ICAO 24-bit address A12B21 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
CXK169 - 128 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 CXK169 - Jul 25, 13:05 UTCJul 25, 14:10 UTC1h 5m
2026-07-23 CXK169 - Jul 23, 10:55 UTCJul 23, 12:00 UTC1h 5m
2026-07-22 CXK169 - Jul 22, 18:50 UTCJul 22, 19:50 UTC1h 0m
2026-07-22 CXK169 LUK → LUK Jul 22, 16:10 UTCJul 22, 17:25 UTC1h 15m
2026-07-22 CXK169 LUK → LUK Jul 22, 13:00 UTCJul 22, 15:00 UTC2h 0m
2026-07-20 CXK169 LUK → LUK Jul 20, 18:05 UTCJul 20, 19:55 UTC1h 50m
2026-07-18 CXK169 LUK → LUK Jul 18, 16:15 UTCJul 18, 17:30 UTC1h 15m
2026-07-17 CXK169 LUK → LUK Jul 17, 13:10 UTCJul 17, 14:20 UTC1h 10m
2026-07-17 CXK169 - Jul 17, 10:40 UTCJul 17, 12:00 UTC1h 20m
2026-07-16 CXK169 LUK → LUK Jul 16, 15:35 UTCJul 16, 17:00 UTC1h 25m
2026-07-15 CXK169 LUK → LUK Jul 15, 22:20 UTCJul 16, 00:15 UTC1h 55m
2026-07-15 CXK169 LUK → LUK Jul 15, 18:40 UTCJul 15, 20:30 UTC1h 50m
2026-07-15 CXK169 LUK → LUK Jul 15, 02:05 UTCJul 15, 04:35 UTC2h 30m
2026-07-14 CXK169 LUK → LUK Jul 14, 23:55 UTCJul 15, 01:10 UTC1h 15m
2026-07-14 CXK169 LUK → LUK Jul 14, 21:20 UTCJul 14, 22:55 UTC1h 34m
2026-07-14 CXK169 LUK → LUK Jul 14, 19:25 UTCJul 14, 19:55 UTC30m
2026-07-14 CXK169 LUK → LUK Jul 14, 12:50 UTCJul 14, 14:45 UTC1h 55m
2026-07-13 CXK169 LUK → LUK Jul 13, 23:30 UTCJul 14, 01:25 UTC1h 55m
2026-07-13 CXK169 LUK → LUK Jul 13, 20:05 UTCJul 13, 21:25 UTC1h 20m
2026-07-13 CXK169 LUK → LUK Jul 13, 16:30 UTCJul 13, 17:05 UTC35m
2026-07-13 CXK169 LUK → LUK Jul 13, 13:30 UTCJul 13, 15:00 UTC1h 30m
2026-07-09 CXK169 LUK → LUK Jul 9, 17:30 UTCJul 9, 18:45 UTC1h 15m
2026-07-07 CXK169 LUK → LUK Jul 7, 21:05 UTCJul 7, 22:35 UTC1h 30m
2026-07-07 CXK169 LUK → LUK Jul 7, 18:35 UTCJul 7, 19:40 UTC1h 5m
2026-07-06 CXK169 LUK → LUK Jul 6, 21:30 UTCJul 6, 22:35 UTC1h 5m
2026-07-06 CXK169 LUK → LUK Jul 6, 18:25 UTCJul 6, 19:25 UTC1h 0m
2026-07-06 CXK169 LUK → LUK Jul 6, 15:40 UTCJul 6, 16:50 UTC1h 10m
2026-07-04 CXK169 LUK → LUK Jul 4, 15:50 UTCJul 4, 16:45 UTC55m
2026-07-04 CXK169 LUK → LUK Jul 4, 12:55 UTCJul 4, 14:35 UTC1h 40m
2026-07-03 CXK169 LUK → LUK Jul 3, 17:05 UTCJul 3, 18:05 UTC1h 0m
2026-07-03 CXK169 LUK → LUK Jul 3, 12:30 UTCJul 3, 15:55 UTC3h 25m
2026-07-02 CXK169 LUK → LUK Jul 2, 21:05 UTCJul 2, 23:10 UTC2h 5m
2026-06-28 CXK169 LUK → LUK Jun 28, 21:14 UTCJun 28, 22:55 UTC1h 40m
2026-06-28 CXK169 LUK → LUK Jun 28, 18:40 UTCJun 28, 19:59 UTC1h 20m
2026-06-25 CXK169 LUK → LUK Jun 25, 16:50 UTCJun 25, 17:05 UTC15m
2026-06-25 CXK169 - Jun 25, 16:35 UTCJun 25, 16:39 UTC5m
2026-06-25 CXK169 LUK → LUK Jun 25, 16:14 UTCJun 25, 16:20 UTC5m
2026-06-25 CXK169 LUK → LUK Jun 25, 15:50 UTCJun 25, 16:05 UTC15m
2026-06-25 CXK169 LUK → LUK Jun 25, 15:40 UTCJun 25, 15:44 UTC5m
2026-06-25 CXK169 LUK → LUK Jun 25, 12:25 UTCJun 25, 14:20 UTC1h 55m
2026-06-25 CXK169 LUK → LUK Jun 25, 02:35 UTCJun 25, 04:35 UTC2h 0m
2026-06-24 CXK169 LUK → LUK Jun 24, 20:24 UTCJun 24, 21:40 UTC1h 15m
2026-06-24 CXK169 LUK → LUK Jun 24, 15:14 UTCJun 24, 16:14 UTC1h 0m
2026-06-24 CXK169 LUK → LUK Jun 24, 12:25 UTCJun 24, 13:24 UTC1h 0m
2026-06-23 CXK169 LUK → LUK Jun 23, 15:55 UTCJun 23, 17:09 UTC1h 15m
2026-06-23 CXK169 LUK → LUK Jun 23, 12:55 UTCJun 23, 14:25 UTC1h 30m
2026-06-21 CXK169 LUK → LUK Jun 21, 20:54 UTCJun 21, 22:54 UTC2h 0m
2026-06-21 CXK169 LUK → LUK Jun 21, 18:39 UTCJun 21, 19:55 UTC1h 15m
2026-06-20 CXK169 LUK → LUK Jun 20, 15:29 UTCJun 20, 17:04 UTC1h 35m
2026-06-20 CXK169 LUK → LUK Jun 20, 12:59 UTCJun 20, 14:29 UTC1h 30m

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 N1745S page for operator, model, and routing details .

Mode-S A12B21 frequently asked

What is Mode-S code A12B21?
A12B21 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N1745S.
Where is Mode-S A12B21 registered?
Mode-S code A12B21 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 A12B21 broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 14:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A12B21, octal 50225441, decimal 10,562,337.
What flights does A12B21 operate?
Mode-S A12B21 has broadcast 1 distinct callsign, including CXK169.