Apparatus

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sensors Mode-S transponder

ABC1EF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N857G · PIPER PA-28-140/150/160/180 · operated by ARCHER FLIGHT LLC

Hex
ABC1EF
Octal
52740757
Decimal
11,256,303
Country
US
Tail
N857G
Type
P28A
No current signal · last broadcast 14h ago
Flights observed
180
Distinct callsigns
1
Country
US
Last broadcast
14h ago

Last known position

Most recent position reported by Mode-S ABC1EF.

Country allocation

The ICAO 24-bit address ABC1EF 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
CXK139 - 180 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 CXK139 - Jul 17, 18:25 UTCJul 17, 18:44 UTC20m
2026-07-17 CXK139 - Jul 17, 16:59 UTCJul 17, 17:35 UTC35m
2026-07-16 CXK139 - Jul 16, 19:10 UTCJul 16, 20:19 UTC1h 10m
2026-07-16 CXK139 - Jul 16, 15:49 UTCJul 16, 16:00 UTC10m
2026-07-15 CXK139 GDC → GMU Jul 15, 21:20 UTCJul 15, 22:20 UTC1h 0m
2026-07-15 CXK139 - Jul 15, 18:05 UTCJul 15, 18:15 UTC10m
2026-07-14 CXK139 - Jul 14, 15:05 UTCJul 14, 15:45 UTC40m
2026-07-14 CXK139 - Jul 14, 12:35 UTCJul 14, 14:10 UTC1h 35m
2026-07-11 CXK139 - Jul 11, 14:45 UTCJul 11, 15:35 UTC50m
2026-07-11 CXK139 GMU → GMU Jul 11, 11:45 UTCJul 11, 12:35 UTC50m
2026-07-09 CXK139 - Jul 9, 16:20 UTCJul 9, 18:55 UTC2h 35m
2026-07-09 CXK139 - Jul 9, 12:05 UTCJul 9, 14:30 UTC2h 25m
2026-07-09 CXK139 - Jul 9, 10:20 UTCJul 9, 11:10 UTC50m
2026-07-08 CXK139 - Jul 8, 15:25 UTCJul 8, 17:10 UTC1h 45m
2026-07-08 CXK139 - Jul 8, 12:30 UTCJul 8, 14:05 UTC1h 35m
2026-07-01 CXK139 - Jul 1, 16:20 UTCJul 1, 17:45 UTC1h 25m
2026-07-01 CXK139 - Jul 1, 11:40 UTCJul 1, 11:50 UTC10m
2026-07-01 CXK139 - Jul 1, 10:45 UTCJul 1, 11:05 UTC20m
2026-06-30 CXK139 - Jun 30, 15:00 UTCJun 30, 16:00 UTC1h 0m
2026-06-30 CXK139 - Jun 30, 12:40 UTCJun 30, 13:35 UTC55m
2026-06-30 CXK139 - Jun 30, 10:05 UTCJun 30, 11:15 UTC1h 10m
2026-06-30 CXK139 - Jun 30, 01:19 UTCJun 30, 02:20 UTC1h 1m
2026-06-29 CXK139 - Jun 29, 23:39 UTCJun 30, 00:00 UTC20m
2026-06-29 CXK139 - Jun 29, 20:04 UTCJun 29, 20:40 UTC35m
2026-06-28 CXK139 - Jun 28, 12:09 UTCJun 28, 13:55 UTC1h 45m
2026-06-27 CXK139 - Jun 27, 15:24 UTCJun 27, 16:39 UTC1h 15m
2026-06-26 CXK139 - Jun 26, 17:09 UTCJun 26, 17:50 UTC40m
2026-06-26 CXK139 - Jun 26, 12:19 UTCJun 26, 13:59 UTC1h 40m
2026-06-26 CXK139 - Jun 26, 03:45 UTCJun 26, 04:24 UTC40m
2026-06-26 CXK139 - Jun 26, 01:20 UTCJun 26, 01:54 UTC35m
2026-06-25 CXK139 - Jun 25, 21:20 UTCJun 25, 23:09 UTC1h 50m
2026-06-25 CXK139 - Jun 25, 18:24 UTCJun 25, 19:59 UTC1h 35m
2026-06-25 CXK139 - Jun 25, 01:40 UTCJun 25, 03:44 UTC2h 5m
2026-06-24 CXK139 - Jun 24, 22:49 UTCJun 25, 00:09 UTC1h 20m
2026-06-24 CXK139 - Jun 24, 18:29 UTCJun 24, 20:05 UTC1h 35m
2026-06-24 CXK139 - Jun 24, 17:14 UTCJun 24, 17:45 UTC30m
2026-06-24 CXK139 - Jun 24, 14:15 UTCJun 24, 15:49 UTC1h 35m
2026-06-24 CXK139 - Jun 24, 09:34 UTCJun 24, 12:30 UTC2h 55m
2026-06-23 CXK139 - Jun 23, 20:04 UTCJun 23, 20:24 UTC20m
2026-06-23 CXK139 - Jun 23, 15:24 UTCJun 23, 15:44 UTC20m
2026-06-23 CXK139 - Jun 23, 13:39 UTCJun 23, 13:55 UTC15m
2026-06-23 CXK139 - Jun 23, 11:14 UTCJun 23, 11:45 UTC30m
2026-06-22 CXK139 RDU → RDU Jun 22, 15:35 UTCJun 22, 16:14 UTC40m
2026-06-22 CXK139 - Jun 22, 12:19 UTCJun 22, 13:49 UTC1h 30m
2026-06-20 CXK139 - Jun 20, 22:59 UTCJun 21, 00:45 UTC1h 45m
2026-06-20 CXK139 - Jun 20, 17:49 UTCJun 20, 19:40 UTC1h 50m
2026-06-20 CXK139 - Jun 20, 12:14 UTCJun 20, 13:44 UTC1h 30m
2026-06-20 CXK139 - Jun 20, 10:09 UTCJun 20, 11:05 UTC55m
2026-06-19 CXK139 - Jun 19, 22:04 UTCJun 19, 23:44 UTC1h 40m
2026-06-19 CXK139 - Jun 19, 17:49 UTCJun 19, 18:34 UTC45m

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 N857G page for operator, model, and routing details .

Mode-S ABC1EF frequently asked

What is Mode-S code ABC1EF?
ABC1EF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N857G.
Where is Mode-S ABC1EF registered?
Mode-S code ABC1EF 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 ABC1EF broadcasting right now?
No active broadcast right now. Last signal was 14h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ABC1EF, octal 52740757, decimal 11,256,303.
What flights does ABC1EF operate?
Mode-S ABC1EF has broadcast 1 distinct callsign, including CXK139.