Apparatus

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sensors Mode-S transponder

A59172

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N458SP · CESSNA 172 Skyhawk · operated by CHRISTIANSEN AVIATION LLC

Hex
A59172
Octal
51310562
Decimal
10,850,674
Country
US
Tail
N458SP
Type
C172
No current signal · last broadcast 1d ago
Flights observed
108
Distinct callsigns
1
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A59172.

Country allocation

The ICAO 24-bit address A59172 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
BYF19 - 108 2026-05-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-28 BYF19 SQL → SQL May 28, 22:45 UTCMay 28, 23:00 UTC15m
2026-05-28 BYF19 SQL → SQL May 28, 22:35 UTCMay 28, 22:40 UTC5m
2026-05-28 BYF19 SQL → SQL May 28, 00:45 UTCMay 28, 01:10 UTC25m
2026-05-27 BYF19 SQL → SQL May 27, 22:05 UTCMay 27, 22:55 UTC50m
2026-05-27 BYF19 - May 27, 16:20 UTCMay 27, 17:15 UTC55m
2026-05-25 BYF19 - May 25, 23:35 UTCMay 26, 00:39 UTC1h 5m
2026-05-25 BYF19 SQL → SQL May 25, 20:40 UTCMay 25, 21:30 UTC50m
2026-05-24 BYF19 SQL → SQL May 24, 19:30 UTCMay 24, 20:20 UTC50m
2026-05-23 BYF19 SQL → SQL May 23, 23:10 UTCMay 23, 23:30 UTC20m
2026-05-23 BYF19 SQL → SQL May 23, 19:40 UTCMay 23, 20:30 UTC50m
2026-05-23 BYF19 SQL → SQL May 23, 17:25 UTCMay 23, 18:35 UTC1h 11m
2026-05-23 BYF19 SQL → SQL May 23, 01:20 UTCMay 23, 01:50 UTC30m
2026-05-22 BYF19 SQL → SQL May 22, 21:35 UTCMay 22, 22:40 UTC1h 5m
2026-05-22 BYF19 - May 22, 18:45 UTCMay 22, 20:15 UTC1h 30m
2026-05-22 BYF19 SQL → SQL May 22, 17:10 UTCMay 22, 17:25 UTC15m
2026-05-22 BYF19 SQL → SQL May 22, 16:45 UTCMay 22, 17:05 UTC20m
2026-05-22 BYF19 SQL → SQL May 22, 01:10 UTCMay 22, 02:20 UTC1h 10m
2026-05-21 BYF19 SQL → SQL May 21, 20:45 UTCMay 21, 21:50 UTC1h 5m
2026-05-21 BYF19 SQL → SQL May 21, 16:55 UTCMay 21, 17:35 UTC40m
2026-05-21 BYF19 SQL → SQL May 21, 00:50 UTCMay 21, 01:40 UTC50m
2026-05-20 BYF19 - May 20, 20:45 UTCMay 20, 22:15 UTC1h 30m
2026-05-20 BYF19 SQL → SQL May 20, 17:20 UTCMay 20, 18:15 UTC55m
2026-05-19 BYF19 SQL → SQL May 19, 22:30 UTCMay 19, 22:40 UTC10m
2026-05-19 BYF19 - May 19, 22:05 UTCMay 19, 22:15 UTC10m
2026-05-19 BYF19 - May 19, 16:15 UTCMay 19, 16:40 UTC25m
2026-05-18 BYF19 SQL → SQL May 18, 20:30 UTCMay 18, 21:35 UTC1h 5m
2026-05-17 BYF19 - May 17, 20:45 UTCMay 17, 21:20 UTC35m
2026-05-16 BYF19 - May 16, 19:25 UTCMay 16, 20:50 UTC1h 25m
2026-05-15 BYF19 SQL → SQL May 15, 23:20 UTCMay 16, 00:15 UTC55m
2026-05-15 BYF19 - May 15, 16:00 UTCMay 15, 16:40 UTC40m
2026-05-14 BYF19 SQL → SQL May 14, 20:15 UTCMay 14, 21:40 UTC1h 25m
2026-05-14 BYF19 SQL → SQL May 14, 15:55 UTCMay 14, 16:20 UTC25m
2026-05-14 BYF19 - May 14, 01:40 UTCMay 14, 02:20 UTC40m
2026-05-13 BYF19 - May 13, 00:05 UTCMay 13, 00:20 UTC15m
2026-05-12 BYF19 SQL → SQL May 12, 21:40 UTCMay 12, 22:15 UTC35m
2026-05-11 BYF19 - May 11, 20:55 UTCMay 11, 21:35 UTC40m
2026-05-11 BYF19 - May 11, 00:45 UTCMay 11, 01:30 UTC45m
2026-05-10 BYF19 - May 10, 22:45 UTCMay 10, 23:15 UTC30m
2026-05-10 BYF19 SQL → SQL May 10, 20:25 UTCMay 10, 21:00 UTC35m
2026-05-09 BYF19 - May 9, 22:00 UTCMay 9, 22:55 UTC55m
2026-05-09 BYF19 - May 9, 19:00 UTCMay 9, 19:19 UTC20m
2026-05-08 BYF19 SQL → SQL May 8, 23:40 UTCMay 9, 00:30 UTC50m
2026-05-08 BYF19 SQL → SQL May 8, 18:40 UTCMay 8, 19:25 UTC45m
2026-05-08 BYF19 SQL → SQL May 8, 16:05 UTCMay 8, 17:05 UTC1h 0m
2026-05-08 BYF19 SQL → SQL May 8, 00:25 UTCMay 8, 00:34 UTC10m
2026-05-07 BYF19 SQL → SQL May 7, 23:34 UTCMay 8, 00:14 UTC40m
2026-05-07 BYF19 - May 7, 20:15 UTCMay 7, 20:25 UTC10m
2026-05-06 BYF19 - May 6, 23:10 UTCMay 6, 23:35 UTC25m
2026-05-06 BYF19 SQL → PAO May 6, 22:25 UTCMay 6, 22:55 UTC30m
2026-05-06 BYF19 SQL → SQL May 6, 20:10 UTCMay 6, 20:50 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 N458SP page for operator, model, and routing details .

Mode-S A59172 frequently asked

What is Mode-S code A59172?
A59172 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N458SP.
Where is Mode-S A59172 registered?
Mode-S code A59172 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 A59172 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A59172, octal 51310562, decimal 10,850,674.
What flights does A59172 operate?
Mode-S A59172 has broadcast 1 distinct callsign, including BYF19.