Apparatus

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sensors Mode-S transponder

A516E5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N427P · BELL 407 · operated by PHI HEALTH LLC

Hex
A516E5
Octal
51213345
Decimal
10,819,301
Country
US
Tail
N427P
Type
B407
No current signal · last broadcast 6d ago
Flights observed
89
Distinct callsigns
1
Country
US
Last broadcast
6d ago

Last known position

Most recent position reported by Mode-S A516E5.

Country allocation

The ICAO 24-bit address A516E5 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
N427P - 89 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N427P - Jul 26, 14:45 UTCJul 26, 15:00 UTC15m
2026-07-25 N427P - Jul 25, 05:35 UTCJul 25, 06:20 UTC45m
2026-07-25 N427P - Jul 25, 03:15 UTCJul 25, 03:45 UTC30m
2026-07-25 N427P - Jul 25, 01:55 UTCJul 25, 02:10 UTC15m
2026-07-25 N427P - Jul 25, 00:35 UTCJul 25, 00:55 UTC20m
2026-07-24 N427P - Jul 24, 23:20 UTCJul 24, 23:35 UTC15m
2026-07-24 N427P - Jul 24, 21:55 UTCJul 24, 22:20 UTC25m
2026-07-24 N427P - Jul 24, 20:45 UTCJul 24, 20:55 UTC10m
2026-07-24 N427P - Jul 24, 18:55 UTCJul 24, 19:05 UTC10m
2026-07-23 N427P - Jul 23, 22:05 UTCJul 23, 22:55 UTC50m
2026-07-23 N427P - Jul 23, 21:05 UTCJul 23, 21:30 UTC25m
2026-07-23 N427P - Jul 23, 20:15 UTCJul 23, 20:25 UTC10m
2026-07-23 N427P - Jul 23, 12:10 UTCJul 23, 12:30 UTC20m
2026-07-21 N427P - Jul 21, 16:50 UTCJul 21, 17:05 UTC15m
2026-07-21 N427P - Jul 21, 04:50 UTCJul 21, 05:10 UTC20m
2026-07-20 N427P - Jul 20, 11:10 UTCJul 20, 11:45 UTC35m
2026-07-20 N427P - Jul 20, 09:15 UTCJul 20, 10:25 UTC1h 10m
2026-07-15 N427P - Jul 15, 13:30 UTCJul 15, 13:45 UTC15m
2026-07-14 N427P - Jul 14, 07:55 UTCJul 14, 08:25 UTC30m
2026-07-14 N427P - Jul 14, 06:30 UTCJul 14, 06:45 UTC15m
2026-07-14 N427P - Jul 14, 05:20 UTCJul 14, 05:35 UTC15m
2026-07-13 N427P - Jul 13, 05:40 UTCJul 13, 06:05 UTC25m
2026-07-13 N427P - Jul 13, 04:00 UTCJul 13, 04:30 UTC30m
2026-07-11 N427P - Jul 11, 15:50 UTCJul 11, 16:45 UTC55m
2026-07-11 N427P - Jul 11, 14:25 UTCJul 11, 15:10 UTC45m
2026-07-11 N427P - Jul 11, 13:25 UTCJul 11, 13:40 UTC15m
2026-07-11 N427P - Jul 11, 07:40 UTCJul 11, 07:50 UTC10m
2026-07-11 N427P - Jul 11, 06:10 UTCJul 11, 06:25 UTC15m
2026-07-11 N427P - Jul 11, 05:01 UTCJul 11, 05:20 UTC20m
2026-07-10 N427P - Jul 10, 21:35 UTCJul 10, 22:05 UTC30m
2026-07-10 N427P - Jul 10, 20:10 UTCJul 10, 20:25 UTC15m
2026-07-04 N427P - Jul 4, 17:50 UTCJul 4, 18:00 UTC10m
2026-06-09 N427P - Jun 9, 13:20 UTCJun 9, 13:35 UTC15m
2026-06-04 N427P - Jun 4, 09:15 UTCJun 4, 10:05 UTC50m
2026-06-04 N427P - Jun 4, 07:50 UTCJun 4, 08:30 UTC40m
2026-06-03 N427P - Jun 3, 19:00 UTCJun 3, 19:25 UTC25m
2026-06-03 N427P - Jun 3, 17:25 UTCJun 3, 18:15 UTC50m
2026-06-03 N427P - Jun 3, 03:40 UTCJun 3, 04:15 UTC35m
2026-06-03 N427P - Jun 3, 02:20 UTCJun 3, 02:30 UTC10m
2026-05-28 N427P - May 28, 15:55 UTCMay 28, 16:10 UTC15m
2026-05-28 N427P - May 28, 14:25 UTCMay 28, 15:20 UTC55m
2026-05-27 N427P - May 27, 20:30 UTCMay 27, 20:50 UTC20m
2026-05-25 N427P - May 25, 21:04 UTCMay 25, 21:24 UTC20m
2026-05-25 N427P - May 25, 20:09 UTCMay 25, 20:24 UTC15m
2026-05-21 N427P - May 21, 20:40 UTCMay 21, 22:40 UTC2h 0m
2026-05-19 N427P - May 19, 18:55 UTCMay 19, 19:15 UTC20m
2026-05-19 N427P - May 19, 17:25 UTCMay 19, 18:15 UTC50m
2026-05-18 N427P - May 18, 17:50 UTCMay 18, 18:05 UTC15m
2026-05-18 N427P - May 18, 16:50 UTCMay 18, 17:05 UTC15m
2026-05-18 N427P - May 18, 05:10 UTCMay 18, 06:25 UTC1h 15m

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 N427P page for operator, model, and routing details .

Mode-S A516E5 frequently asked

What is Mode-S code A516E5?
A516E5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N427P.
Where is Mode-S A516E5 registered?
Mode-S code A516E5 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 A516E5 broadcasting right now?
No active broadcast right now. Last signal was 6d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A516E5, octal 51213345, decimal 10,819,301.
What flights does A516E5 operate?
Mode-S A516E5 has broadcast 1 distinct callsign, including N427P.