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sensors Mode-S transponder

A51E5B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N429PH · BELL 407 · operated by PHI HEALTH LLC

Hex
A51E5B
Octal
51217133
Decimal
10,821,211
Country
US
Tail
N429PH
Type
B407
No current signal · last broadcast 23d ago
Flights observed
58
Distinct callsigns
1
Country
US
Last broadcast
23d ago

Last known position

Most recent position reported by Mode-S A51E5B.

Country allocation

The ICAO 24-bit address A51E5B 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
N429PH - 54 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N429PH - Jul 26, 16:15 UTCJul 26, 16:25 UTC10m
2026-07-25 N429PH - Jul 25, 05:55 UTCJul 25, 06:05 UTC10m
2026-07-22 N429PH - Jul 22, 19:55 UTCJul 22, 20:05 UTC10m
2026-07-18 N429PH - Jul 18, 02:50 UTCJul 18, 03:00 UTC10m
2026-07-15 N429PH - Jul 15, 23:40 UTCJul 15, 23:50 UTC10m
2026-07-10 N429PH - Jul 10, 01:40 UTCJul 10, 01:50 UTC10m
2026-07-09 N429PH - Jul 9, 19:20 UTCJul 9, 19:30 UTC10m
2026-07-09 N429PH - Jul 9, 06:35 UTCJul 9, 07:45 UTC1h 10m
2026-07-07 N429PH - Jul 7, 06:10 UTCJul 7, 06:40 UTC30m
2026-07-07 N429PH - Jul 7, 05:05 UTCJul 7, 05:35 UTC30m
2026-07-05 N429PH - Jul 5, 01:55 UTCJul 5, 02:05 UTC10m
2026-07-04 N429PH - Jul 4, 22:10 UTCJul 4, 22:50 UTC40m
2026-07-04 N429PH - Jul 4, 09:25 UTCJul 4, 09:35 UTC10m
2026-07-03 N429PH - Jul 3, 19:30 UTCJul 3, 19:40 UTC10m
2026-06-29 N429PH - Jun 29, 20:00 UTCJun 29, 20:09 UTC10m
2026-06-29 N429PH - Jun 29, 19:20 UTCJun 29, 19:29 UTC10m
2026-06-29 N429PH - Jun 29, 15:34 UTCJun 29, 15:45 UTC10m
2026-06-29 N429PH - Jun 29, 02:50 UTCJun 29, 02:59 UTC10m
2026-06-29 N429PH - Jun 29, 01:50 UTCJun 29, 02:00 UTC10m
2026-06-28 N429PH - Jun 28, 11:35 UTCJun 28, 12:05 UTC30m
2026-06-28 N429PH - Jun 28, 07:34 UTCJun 28, 07:50 UTC15m
2026-06-26 N429PH - Jun 26, 03:24 UTCJun 26, 03:34 UTC10m
2026-06-24 N429PH - Jun 24, 21:19 UTCJun 24, 21:54 UTC35m
2026-06-15 N429PH - Jun 15, 05:00 UTCJun 15, 05:10 UTC10m
2026-06-14 N429PH - Jun 14, 17:20 UTCJun 14, 17:35 UTC15m
2026-06-14 N429PH - Jun 14, 07:05 UTCJun 14, 07:30 UTC25m
2026-06-14 N429PH - Jun 14, 05:55 UTCJun 14, 06:20 UTC25m
2026-06-13 N429PH - Jun 13, 11:40 UTCJun 13, 11:50 UTC10m
2026-06-13 N429PH - Jun 13, 10:05 UTCJun 13, 10:20 UTC15m
2026-06-11 N429PH - Jun 11, 19:20 UTCJun 11, 19:30 UTC10m
2026-06-11 N429PH - Jun 11, 17:35 UTCJun 11, 17:45 UTC10m
2026-06-09 - - Jun 9, 17:20 UTCJun 9, 17:30 UTC10m
2026-06-06 N429PH - Jun 6, 06:55 UTCJun 6, 07:35 UTC40m
2026-06-06 N429PH - Jun 6, 04:30 UTCJun 6, 04:40 UTC10m
2026-05-21 N429PH - May 21, 23:35 UTCMay 22, 00:15 UTC40m
2026-05-16 N429PH - May 16, 00:40 UTCMay 16, 01:15 UTC35m
2026-05-14 N429PH - May 14, 19:10 UTCMay 14, 19:45 UTC35m
2026-05-14 N429PH MVC → MVC May 14, 12:25 UTCMay 14, 12:45 UTC20m
2026-05-10 N429PH - May 10, 19:24 UTCMay 10, 19:35 UTC10m
2026-05-06 N429PH - May 6, 06:05 UTCMay 6, 06:30 UTC25m
2026-05-06 N429PH - May 6, 04:45 UTCMay 6, 05:30 UTC45m
2026-05-06 N429PH - May 6, 03:05 UTCMay 6, 03:25 UTC20m
2026-05-04 N429PH - May 4, 00:10 UTCMay 4, 00:19 UTC10m
2026-05-02 N429PH - May 2, 22:20 UTCMay 2, 22:30 UTC10m
2026-04-29 N429PH - Apr 29, 20:05 UTCApr 29, 20:15 UTC10m
2026-04-28 - - Apr 28, 16:50 UTCApr 28, 17:00 UTC10m
2026-04-27 - - Apr 27, 16:20 UTCApr 27, 16:30 UTC10m
2026-04-25 - - Apr 25, 22:35 UTCApr 25, 22:45 UTC10m
2026-04-24 N429PH - Apr 24, 03:15 UTCApr 24, 03:25 UTC10m
2026-04-22 N429PH - Apr 22, 18:55 UTCApr 22, 19:05 UTC10m

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 N429PH page for operator, model, and routing details .

Mode-S A51E5B frequently asked

What is Mode-S code A51E5B?
A51E5B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N429PH.
Where is Mode-S A51E5B registered?
Mode-S code A51E5B 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 A51E5B broadcasting right now?
No active broadcast right now. Last signal was 23d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A51E5B, octal 51217133, decimal 10,821,211.
What flights does A51E5B operate?
Mode-S A51E5B has broadcast 1 distinct callsign, including N429PH.