Apparatus

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sensors Mode-S transponder

A12405

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N17274 · CESSNA 172R Cutlass RG · operated by UNIVERSITY OF ALASKA ANCHORAGE

Hex
A12405
Octal
50222005
Decimal
10,560,517
Country
US
Tail
N17274
Type
C72R
No current signal · last broadcast Jul 24, 19:35 UTC
Flights observed
208
Distinct callsigns
1
Country
US
Last broadcast
Jul 24, 19:35 UTC

Last known position

Most recent position reported by Mode-S A12405.

Country allocation

The ICAO 24-bit address A12405 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
N17274 - 208 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 N17274 - Jul 24, 19:15 UTCJul 24, 19:35 UTC20m
2026-07-24 N17274 - Jul 24, 16:20 UTCJul 24, 17:10 UTC50m
2026-07-22 N17274 - Jul 22, 21:15 UTCJul 22, 22:45 UTC1h 30m
2026-07-22 N17274 MRI → MRI Jul 22, 01:15 UTCJul 22, 02:45 UTC1h 30m
2026-07-21 N17274 - Jul 21, 22:15 UTCJul 21, 22:40 UTC25m
2026-07-21 N17274 - Jul 21, 21:30 UTCJul 21, 22:00 UTC30m
2026-07-21 N17274 MRI → MRI Jul 21, 18:45 UTCJul 21, 20:35 UTC1h 50m
2026-07-21 N17274 - Jul 21, 16:55 UTCJul 21, 18:00 UTC1h 5m
2026-07-16 N17274 - Jul 16, 21:15 UTCJul 16, 22:25 UTC1h 10m
2026-07-16 N17274 - Jul 16, 19:25 UTCJul 16, 19:35 UTC10m
2026-07-16 N17274 MRI → MRI Jul 16, 19:10 UTCJul 16, 19:20 UTC10m
2026-07-16 N17274 - Jul 16, 17:10 UTCJul 16, 18:10 UTC1h 0m
2026-07-16 N17274 - Jul 16, 06:40 UTCJul 16, 07:45 UTC1h 5m
2026-07-14 N17274 - Jul 14, 04:15 UTCJul 14, 04:55 UTC40m
2026-07-14 N17274 - Jul 14, 01:20 UTCJul 14, 02:10 UTC50m
2026-07-11 N17274 - Jul 11, 19:00 UTCJul 11, 19:35 UTC35m
2026-07-11 N17274 - Jul 11, 17:00 UTCJul 11, 17:55 UTC55m
2026-07-11 N17274 - Jul 11, 06:50 UTCJul 11, 08:01 UTC1h 10m
2026-07-11 N17274 - Jul 11, 04:05 UTCJul 11, 05:20 UTC1h 15m
2026-07-10 N17274 - Jul 10, 23:40 UTCJul 11, 00:55 UTC1h 15m
2026-07-10 N17274 - Jul 10, 21:15 UTCJul 10, 22:35 UTC1h 20m
2026-07-10 N17274 - Jul 10, 18:55 UTCJul 10, 20:05 UTC1h 10m
2026-07-10 N17274 - Jul 10, 07:15 UTCJul 10, 07:30 UTC15m
2026-07-10 N17274 - Jul 10, 06:45 UTCJul 10, 07:10 UTC25m
2026-07-10 N17274 - Jul 10, 03:55 UTCJul 10, 05:15 UTC1h 20m
2026-07-10 N17274 - Jul 10, 01:50 UTCJul 10, 02:55 UTC1h 5m
2026-07-09 N17274 - Jul 9, 04:05 UTCJul 9, 05:15 UTC1h 10m
2026-07-09 N17274 - Jul 9, 01:55 UTCJul 9, 03:10 UTC1h 15m
2026-07-08 N17274 WWA → MRI Jul 8, 22:10 UTCJul 8, 22:40 UTC30m
2026-07-08 N17274 - Jul 8, 21:25 UTCJul 8, 21:55 UTC30m
2026-07-08 N17274 - Jul 8, 18:55 UTCJul 8, 19:25 UTC30m
2026-07-08 N17274 - Jul 8, 17:00 UTCJul 8, 17:35 UTC35m
2026-07-08 N17274 - Jul 8, 14:35 UTCJul 8, 15:35 UTC1h 0m
2026-07-08 N17274 MRI → MRI Jul 8, 01:40 UTCJul 8, 02:35 UTC55m
2026-07-07 N17274 - Jul 7, 23:45 UTCJul 8, 00:25 UTC40m
2026-07-07 N17274 - Jul 7, 21:30 UTCJul 7, 22:40 UTC1h 10m
2026-07-07 N17274 - Jul 7, 17:25 UTCJul 7, 17:30 UTC5m
2026-07-07 N17274 - Jul 7, 16:00 UTCJul 7, 16:05 UTC5m
2026-07-07 N17274 - Jul 7, 15:40 UTCJul 7, 15:45 UTC5m
2026-07-07 N17274 - Jul 7, 02:05 UTCJul 7, 03:05 UTC1h 0m
2026-07-06 N17274 - Jul 6, 23:45 UTCJul 7, 00:40 UTC55m
2026-07-06 N17274 - Jul 6, 21:20 UTCJul 6, 22:30 UTC1h 10m
2026-07-06 N17274 - Jul 6, 19:35 UTCJul 6, 20:15 UTC40m
2026-07-05 N17274 - Jul 5, 22:00 UTCJul 5, 22:55 UTC55m
2026-07-05 N17274 - Jul 5, 20:55 UTCJul 5, 21:45 UTC50m
2026-07-04 N17274 - Jul 4, 02:40 UTCJul 4, 03:05 UTC25m
2026-07-04 N17274 - Jul 4, 02:10 UTCJul 4, 02:35 UTC25m
2026-07-04 N17274 MRI → MRI Jul 4, 00:10 UTCJul 4, 00:50 UTC40m
2026-07-03 N17274 - Jul 3, 20:45 UTCJul 3, 21:50 UTC1h 5m
2026-07-03 N17274 - Jul 3, 19:10 UTCJul 3, 19:50 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 N17274 page for operator, model, and routing details .

Mode-S A12405 frequently asked

What is Mode-S code A12405?
A12405 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N17274.
Where is Mode-S A12405 registered?
Mode-S code A12405 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 A12405 broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 19:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A12405, octal 50222005, decimal 10,560,517.
What flights does A12405 operate?
Mode-S A12405 has broadcast 1 distinct callsign, including N17274.