Apparatus

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sensors Mode-S transponder

A73CEB

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N56578 · PIPER PA-28-140/150/160/180 · operated by SOMERSET AIR SERVICE INC

Hex
A73CEB
Octal
51636353
Decimal
10,960,107
Country
US
Tail
N56578
Type
P28A
Broadcasting now · callsign N56578 · 3,400 ft
Flights observed
294
Distinct callsigns
1
Country
US
Last broadcast
Jul 26, 20:15 UTC

Current position

A73CEB is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A73CEB 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
N56578 - 293 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N56578 - Jul 26, 19:35 UTCJul 26, 20:15 UTC40m
2026-07-26 N56578 - Jul 26, 17:35 UTCJul 26, 19:00 UTC1h 25m
2026-07-26 N56578 - Jul 26, 12:30 UTCJul 26, 13:40 UTC1h 10m
2026-07-25 N56578 - Jul 25, 19:35 UTCJul 25, 21:00 UTC1h 25m
2026-07-25 N56578 - Jul 25, 16:35 UTCJul 25, 18:00 UTC1h 25m
2026-07-25 N56578 - Jul 25, 14:35 UTCJul 25, 16:05 UTC1h 30m
2026-07-25 N56578 - Jul 25, 12:25 UTCJul 25, 13:50 UTC1h 25m
2026-07-24 N56578 - Jul 24, 19:05 UTCJul 24, 20:00 UTC55m
2026-07-24 N56578 - Jul 24, 16:35 UTCJul 24, 18:00 UTC1h 25m
2026-07-24 N56578 - Jul 24, 12:45 UTCJul 24, 14:05 UTC1h 20m
2026-07-23 N56578 - Jul 23, 20:00 UTCJul 23, 20:35 UTC35m
2026-07-23 N56578 - Jul 23, 17:35 UTCJul 23, 18:40 UTC1h 5m
2026-07-23 N56578 - Jul 23, 14:35 UTCJul 23, 15:40 UTC1h 5m
2026-07-23 N56578 - Jul 23, 12:30 UTCJul 23, 14:00 UTC1h 30m
2026-07-22 N56578 - Jul 22, 19:45 UTCJul 22, 20:15 UTC30m
2026-07-22 N56578 - Jul 22, 16:45 UTCJul 22, 17:55 UTC1h 10m
2026-07-22 N56578 - Jul 22, 12:30 UTCJul 22, 13:55 UTC1h 25m
2026-07-21 N56578 - Jul 21, 01:00 UTCJul 21, 03:10 UTC2h 10m
2026-07-20 N56578 - Jul 20, 21:25 UTCJul 20, 22:50 UTC1h 25m
2026-07-20 N56578 - Jul 20, 20:20 UTCJul 20, 20:55 UTC35m
2026-07-20 N56578 - Jul 20, 14:35 UTCJul 20, 15:45 UTC1h 10m
2026-07-20 N56578 - Jul 20, 12:30 UTCJul 20, 13:50 UTC1h 20m
2026-07-16 N56578 - Jul 16, 18:05 UTCJul 16, 18:19 UTC15m
2026-07-16 N56578 - Jul 16, 14:50 UTCJul 16, 16:00 UTC1h 10m
2026-07-16 N56578 - Jul 16, 12:55 UTCJul 16, 13:54 UTC1h 0m
2026-07-15 N56578 - Jul 15, 16:40 UTCJul 15, 18:55 UTC2h 15m
2026-07-15 N56578 - Jul 15, 14:40 UTCJul 15, 15:35 UTC55m
2026-07-15 N56578 - Jul 15, 12:40 UTCJul 15, 13:55 UTC1h 15m
2026-07-14 N56578 - Jul 14, 18:45 UTCJul 14, 20:20 UTC1h 35m
2026-07-14 N56578 - Jul 14, 17:10 UTCJul 14, 17:55 UTC45m
2026-07-14 N56578 - Jul 14, 14:30 UTCJul 14, 16:00 UTC1h 30m
2026-07-14 N56578 - Jul 14, 12:50 UTCJul 14, 13:50 UTC1h 0m
2026-07-14 N56578 - Jul 14, 00:05 UTCJul 14, 00:55 UTC50m
2026-07-13 N56578 - Jul 13, 19:25 UTCJul 13, 20:55 UTC1h 30m
2026-07-13 N56578 - Jul 13, 17:30 UTCJul 13, 18:05 UTC35m
2026-07-13 N56578 - Jul 13, 14:40 UTCJul 13, 15:50 UTC1h 10m
2026-07-13 N56578 - Jul 13, 12:35 UTCJul 13, 14:05 UTC1h 30m
2026-07-12 N56578 - Jul 12, 17:45 UTCJul 12, 19:20 UTC1h 35m
2026-07-12 N56578 - Jul 12, 15:55 UTCJul 12, 16:05 UTC10m
2026-07-12 N56578 - Jul 12, 14:30 UTCJul 12, 15:20 UTC50m
2026-07-12 N56578 - Jul 12, 12:30 UTCJul 12, 13:35 UTC1h 5m
2026-07-11 N56578 - Jul 11, 17:50 UTCJul 11, 19:10 UTC1h 20m
2026-07-11 N56578 - Jul 11, 14:35 UTCJul 11, 15:55 UTC1h 20m
2026-07-10 N56578 - Jul 10, 19:45 UTCJul 10, 21:00 UTC1h 15m
2026-07-10 N56578 - Jul 10, 16:40 UTCJul 10, 18:55 UTC2h 15m
2026-07-10 N56578 - Jul 10, 15:35 UTCJul 10, 16:05 UTC30m
2026-07-10 N56578 - Jul 10, 12:25 UTCJul 10, 14:10 UTC1h 45m
2026-07-09 N56578 - Jul 9, 16:45 UTCJul 9, 17:15 UTC30m
2026-07-09 N56578 - Jul 9, 12:30 UTCJul 9, 14:05 UTC1h 35m
2026-07-08 N56578 - Jul 8, 21:45 UTCJul 8, 23:35 UTC1h 50m

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 N56578 page for operator, model, and routing details .

Mode-S A73CEB frequently asked

What is Mode-S code A73CEB?
A73CEB is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N56578.
Where is Mode-S A73CEB registered?
Mode-S code A73CEB 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 A73CEB broadcasting right now?
Yes. Mode-S A73CEB is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A73CEB, octal 51636353, decimal 10,960,107.
What flights does A73CEB operate?
Mode-S A73CEB has broadcast 1 distinct callsign, including N56578.