Apparatus

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sensors Mode-S transponder

A12EFC

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N1756T · CESSNA 172 Skyhawk · operated by FLIGHT OPERATIONS AIRCRAFT LLC

Hex
A12EFC
Octal
50227374
Decimal
10,563,324
Country
US
Tail
N1756T
Type
C172
Broadcasting now · callsign CXK564 · 7,150 ft
Flights observed
138
Distinct callsigns
1
Country
US
Last broadcast
Jul 22, 13:20 UTC

Current position

A12EFC is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A12EFC 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
CXK564 - 138 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-22 CXK564 OGD → OGD Jul 22, 11:55 UTCJul 22, 13:20 UTC1h 25m
2026-07-21 CXK564 - Jul 21, 23:05 UTCJul 22, 00:15 UTC1h 10m
2026-07-21 CXK564 OGD → OGD Jul 21, 17:30 UTCJul 21, 19:05 UTC1h 35m
2026-07-21 CXK564 - Jul 21, 13:25 UTCJul 21, 16:00 UTC2h 35m
2026-07-21 CXK564 OGD → OGD Jul 21, 11:50 UTCJul 21, 12:20 UTC30m
2026-07-20 CXK564 - Jul 20, 18:50 UTCJul 20, 19:15 UTC25m
2026-07-20 CXK564 OGD → OGD Jul 20, 17:30 UTCJul 20, 17:50 UTC20m
2026-07-20 CXK564 OGD → OGD Jul 20, 12:45 UTCJul 20, 15:20 UTC2h 35m
2026-07-20 CXK564 OGD → OGD Jul 20, 11:45 UTCJul 20, 12:05 UTC20m
2026-07-19 CXK564 - Jul 19, 13:55 UTCJul 19, 14:45 UTC50m
2026-07-19 CXK564 - Jul 19, 12:30 UTCJul 19, 13:10 UTC40m
2026-07-18 CXK564 - Jul 18, 20:35 UTCJul 18, 21:35 UTC1h 0m
2026-07-18 CXK564 - Jul 18, 12:10 UTCJul 18, 14:25 UTC2h 15m
2026-07-17 CXK564 - Jul 17, 18:15 UTCJul 17, 19:40 UTC1h 25m
2026-07-16 CXK564 - Jul 16, 16:05 UTCJul 16, 17:40 UTC1h 35m
2026-07-15 CXK564 - Jul 15, 18:15 UTCJul 15, 19:10 UTC55m
2026-07-15 CXK564 - Jul 15, 16:25 UTCJul 15, 17:20 UTC55m
2026-07-14 CXK564 - Jul 14, 14:45 UTCJul 14, 14:55 UTC10m
2026-07-14 CXK564 - Jul 14, 13:30 UTCJul 14, 13:40 UTC10m
2026-07-14 CXK564 - Jul 14, 12:10 UTCJul 14, 12:30 UTC20m
2026-07-13 CXK564 - Jul 13, 18:55 UTCJul 13, 19:05 UTC10m
2026-07-13 CXK564 - Jul 13, 16:55 UTCJul 13, 17:20 UTC25m
2026-07-13 CXK564 - Jul 13, 14:05 UTCJul 13, 15:30 UTC1h 25m
2026-07-12 CXK564 - Jul 12, 18:20 UTCJul 12, 18:50 UTC30m
2026-07-12 CXK564 - Jul 12, 16:20 UTCJul 12, 17:10 UTC50m
2026-07-12 CXK564 - Jul 12, 13:15 UTCJul 12, 14:40 UTC1h 25m
2026-07-11 CXK564 - Jul 11, 18:40 UTCJul 11, 20:15 UTC1h 35m
2026-07-11 CXK564 - Jul 11, 15:35 UTCJul 11, 16:50 UTC1h 15m
2026-07-10 CXK564 - Jul 10, 20:20 UTCJul 10, 22:00 UTC1h 40m
2026-07-10 CXK564 - Jul 10, 17:25 UTCJul 10, 18:20 UTC55m
2026-07-10 CXK564 - Jul 10, 14:50 UTCJul 10, 16:05 UTC1h 15m
2026-07-10 CXK564 - Jul 10, 13:35 UTCJul 10, 14:00 UTC25m
2026-07-10 CXK564 BOI → BOI Jul 10, 11:50 UTCJul 10, 12:45 UTC55m
2026-07-10 CXK564 - Jul 10, 01:00 UTCJul 10, 01:20 UTC20m
2026-07-09 CXK564 - Jul 9, 21:25 UTCJul 9, 22:25 UTC1h 0m
2026-07-09 CXK564 - Jul 9, 19:20 UTCJul 9, 20:15 UTC55m
2026-07-09 CXK564 - Jul 9, 17:05 UTCJul 9, 17:55 UTC50m
2026-07-09 CXK564 - Jul 9, 14:25 UTCJul 9, 15:35 UTC1h 10m
2026-07-09 CXK564 - Jul 9, 11:40 UTCJul 9, 12:35 UTC55m
2026-07-08 CXK564 - Jul 8, 20:40 UTCJul 8, 21:50 UTC1h 10m
2026-07-08 CXK564 - Jul 8, 17:20 UTCJul 8, 19:05 UTC1h 45m
2026-07-08 CXK564 - Jul 8, 11:50 UTCJul 8, 13:15 UTC1h 25m
2026-07-07 CXK564 - Jul 7, 23:20 UTCJul 8, 00:30 UTC1h 10m
2026-07-07 CXK564 - Jul 7, 20:05 UTCJul 7, 21:20 UTC1h 15m
2026-07-07 CXK564 - Jul 7, 17:40 UTCJul 7, 18:55 UTC1h 15m
2026-07-07 CXK564 - Jul 7, 04:30 UTCJul 7, 05:55 UTC1h 25m
2026-07-06 CXK564 - Jul 6, 20:10 UTCJul 6, 21:40 UTC1h 30m
2026-07-06 CXK564 - Jul 6, 16:40 UTCJul 6, 17:35 UTC55m
2026-07-06 CXK564 - Jul 6, 00:00 UTCJul 6, 00:20 UTC20m
2026-07-05 CXK564 - Jul 5, 22:45 UTCJul 5, 23:05 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 N1756T page for operator, model, and routing details .

Mode-S A12EFC frequently asked

What is Mode-S code A12EFC?
A12EFC is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N1756T.
Where is Mode-S A12EFC registered?
Mode-S code A12EFC 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 A12EFC broadcasting right now?
Yes. Mode-S A12EFC is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A12EFC, octal 50227374, decimal 10,563,324.
What flights does A12EFC operate?
Mode-S A12EFC has broadcast 1 distinct callsign, including CXK564.