Apparatus

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sensors Mode-S transponder

A0F00A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N16HF · ROBINSON R-22 Mariner · operated by UNIVERSAL AVIATORS ACADEMY INC

Hex
A0F00A
Octal
50170012
Decimal
10,547,210
Country
US
Tail
N16HF
Type
R22
No current signal · last broadcast Jul 25, 18:20 UTC
Flights observed
49
Distinct callsigns
1
Country
US
Last broadcast
Jul 25, 18:20 UTC

Last known position

Most recent position reported by Mode-S A0F00A.

Country allocation

The ICAO 24-bit address A0F00A 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
N16HF - 49 2026-07-25

Recent flights last 49

DateFlightRouteTakeoffLandingDuration
2026-07-25 N16HF - Jul 25, 18:00 UTCJul 25, 18:20 UTC20m
2026-07-25 N16HF EMT → POC Jul 25, 17:10 UTCJul 25, 17:30 UTC20m
2026-07-24 N16HF EMT → EMT Jul 24, 19:45 UTCJul 24, 20:25 UTC40m
2026-07-22 N16HF - Jul 22, 17:35 UTCJul 22, 18:20 UTC45m
2026-07-19 N16HF EMT → EMT Jul 19, 02:50 UTCJul 19, 03:15 UTC25m
2026-07-16 N16HF - Jul 16, 17:10 UTCJul 16, 18:29 UTC1h 20m
2026-07-15 N16HF - Jul 15, 00:45 UTCJul 15, 01:15 UTC30m
2026-07-14 N16HF EMT → EMT Jul 14, 18:00 UTCJul 14, 18:35 UTC35m
2026-07-12 N16HF - Jul 12, 18:05 UTCJul 12, 18:45 UTC40m
2026-07-11 N16HF - Jul 11, 21:15 UTCJul 11, 21:35 UTC20m
2026-07-11 N16HF - Jul 11, 17:40 UTCJul 11, 18:00 UTC20m
2026-07-10 N16HF SBD → EMT Jul 10, 04:30 UTCJul 10, 05:15 UTC45m
2026-07-01 N16HF - Jul 1, 02:05 UTCJul 1, 02:35 UTC30m
2026-06-29 N16HF EMT → EMT Jun 29, 16:50 UTCJun 29, 17:34 UTC45m
2026-06-28 N16HF - Jun 28, 22:34 UTCJun 28, 23:39 UTC1h 5m
2026-06-25 N16HF - Jun 25, 02:59 UTCJun 25, 04:04 UTC1h 5m
2026-06-24 N16HF EMT → EMT Jun 24, 22:10 UTCJun 24, 22:45 UTC35m
2026-06-24 N16HF EMT → EMT Jun 24, 01:19 UTCJun 24, 02:49 UTC1h 30m
2026-06-23 N16HF - Jun 23, 15:30 UTCJun 23, 16:20 UTC50m
2026-06-23 N16HF - Jun 23, 03:15 UTCJun 23, 04:45 UTC1h 30m
2026-06-22 N16HF EMT → EMT Jun 22, 14:34 UTCJun 22, 15:05 UTC30m
2026-06-21 N16HF - Jun 21, 21:19 UTCJun 21, 22:10 UTC50m
2026-06-20 N16HF EMT → EMT Jun 20, 17:34 UTCJun 20, 18:40 UTC1h 5m
2026-06-20 N16HF VNY → EMT Jun 20, 02:14 UTCJun 20, 03:04 UTC50m
2026-06-19 N16HF - Jun 19, 22:45 UTCJun 19, 23:04 UTC20m
2026-06-19 N16HF - Jun 19, 18:49 UTCJun 19, 19:14 UTC25m
2026-06-18 N16HF EMT → EMT Jun 18, 21:30 UTCJun 18, 21:50 UTC20m
2026-06-18 N16HF - Jun 18, 17:30 UTCJun 18, 18:10 UTC40m
2026-06-17 N16HF - Jun 17, 14:40 UTCJun 17, 15:00 UTC20m
2026-06-16 N16HF EMT → EMT Jun 16, 21:15 UTCJun 16, 22:35 UTC1h 20m
2026-06-16 N16HF EMT → EMT Jun 16, 16:10 UTCJun 16, 16:45 UTC35m
2026-06-13 N16HF - Jun 13, 21:20 UTCJun 13, 22:05 UTC45m
2026-06-13 N16HF - Jun 13, 19:40 UTCJun 13, 20:40 UTC1h 0m
2026-06-12 N16HF - Jun 12, 19:15 UTCJun 12, 20:30 UTC1h 15m
2026-06-09 N16HF EMT → EMT Jun 9, 20:50 UTCJun 9, 22:40 UTC1h 50m
2026-06-08 N16HF - Jun 8, 19:35 UTCJun 8, 20:10 UTC35m
2026-06-07 N16HF - Jun 7, 18:05 UTCJun 7, 18:55 UTC50m
2026-06-01 N16HF - Jun 1, 17:35 UTCJun 1, 18:15 UTC40m
2026-05-31 N16HF - May 31, 18:00 UTCMay 31, 18:50 UTC50m
2026-05-30 N16HF - May 30, 23:50 UTCMay 31, 00:30 UTC40m
2026-05-30 N16HF - May 30, 21:25 UTCMay 30, 22:00 UTC35m
2026-05-01 N16HF - May 1, 17:45 UTCMay 1, 18:20 UTC35m
2026-04-30 N16HF EMT → EMT Apr 30, 19:45 UTCApr 30, 21:15 UTC1h 30m
2026-04-30 N16HF EMT → EMT Apr 30, 01:00 UTCApr 30, 01:45 UTC45m
2026-04-28 N16HF - Apr 28, 18:40 UTCApr 28, 19:25 UTC45m
2026-04-25 N16HF - Apr 25, 22:15 UTCApr 25, 22:35 UTC20m
2026-04-23 N16HF - Apr 23, 22:40 UTCApr 23, 23:50 UTC1h 10m
2026-04-16 N16HF - Apr 16, 16:30 UTCApr 16, 17:00 UTC30m
2026-04-14 N16HF - Apr 14, 20:55 UTCApr 14, 21:25 UTC30m

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 N16HF page for operator, model, and routing details .

Mode-S A0F00A frequently asked

What is Mode-S code A0F00A?
A0F00A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N16HF.
Where is Mode-S A0F00A registered?
Mode-S code A0F00A 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 A0F00A broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 18:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0F00A, octal 50170012, decimal 10,547,210.
What flights does A0F00A operate?
Mode-S A0F00A has broadcast 1 distinct callsign, including N16HF.