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sensors Mode-S transponder

A02321

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N108HF · CESSNA 172 Skyhawk · operated by HERITAGE ASSET LEASING LLC

Hex
A02321
Octal
50021441
Decimal
10,494,753
Country
US
Tail
N108HF
Type
C172
No current signal · last broadcast 1h ago
Flights observed
179
Distinct callsigns
1
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S A02321.

Country allocation

The ICAO 24-bit address A02321 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
N108HF - 179 2026-07-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 N108HF - Jul 15, 01:50 UTCJul 15, 03:35 UTC1h 45m
2026-07-14 N108HF - Jul 14, 15:55 UTCJul 14, 16:35 UTC40m
2026-06-25 N108HF - Jun 25, 18:34 UTCJun 25, 18:59 UTC25m
2026-06-25 N108HF - Jun 25, 16:09 UTCJun 25, 17:05 UTC55m
2026-06-25 N108HF - Jun 25, 13:00 UTCJun 25, 13:50 UTC50m
2026-06-24 N108HF - Jun 24, 15:49 UTCJun 24, 16:50 UTC1h 0m
2026-06-24 N108HF - Jun 24, 13:50 UTCJun 24, 14:39 UTC50m
2026-06-22 N108HF - Jun 22, 13:44 UTCJun 22, 14:49 UTC1h 5m
2026-06-22 N108HF - Jun 22, 12:10 UTCJun 22, 12:49 UTC40m
2026-06-21 N108HF - Jun 21, 20:40 UTCJun 21, 21:14 UTC35m
2026-06-21 N108HF - Jun 21, 16:54 UTCJun 21, 19:14 UTC2h 20m
2026-06-21 N108HF - Jun 21, 12:49 UTCJun 21, 15:15 UTC2h 25m
2026-06-19 N108HF - Jun 19, 16:04 UTCJun 19, 18:30 UTC2h 25m
2026-06-19 N108HF - Jun 19, 12:25 UTCJun 19, 13:14 UTC50m
2026-06-17 N108HF - Jun 17, 23:15 UTCJun 18, 00:40 UTC1h 25m
2026-06-17 N108HF - Jun 17, 21:45 UTCJun 17, 22:35 UTC50m
2026-06-17 N108HF - Jun 17, 19:45 UTCJun 17, 20:30 UTC45m
2026-06-17 N108HF - Jun 17, 17:00 UTCJun 17, 18:35 UTC1h 35m
2026-06-17 N108HF ISP → ISP Jun 17, 15:00 UTCJun 17, 15:50 UTC50m
2026-06-17 N108HF - Jun 17, 13:00 UTCJun 17, 13:35 UTC35m
2026-06-17 N108HF - Jun 17, 00:05 UTCJun 17, 00:40 UTC35m
2026-06-16 N108HF - Jun 16, 21:10 UTCJun 16, 23:15 UTC2h 5m
2026-06-16 N108HF ISP → ISP Jun 16, 17:40 UTCJun 16, 18:45 UTC1h 5m
2026-06-16 N108HF - Jun 16, 15:00 UTCJun 16, 16:00 UTC1h 0m
2026-06-16 N108HF - Jun 16, 13:15 UTCJun 16, 13:30 UTC15m
2026-06-16 N108HF ISP → ISP Jun 16, 11:49 UTCJun 16, 12:14 UTC25m
2026-06-16 N108HF - Jun 16, 01:40 UTCJun 16, 03:15 UTC1h 35m
2026-06-15 N108HF - Jun 15, 23:15 UTCJun 16, 00:20 UTC1h 5m
2026-06-15 N108HF - Jun 15, 19:35 UTCJun 15, 21:35 UTC2h 0m
2026-06-15 N108HF - Jun 15, 16:55 UTCJun 15, 17:50 UTC55m
2026-06-14 N108HF - Jun 14, 14:50 UTCJun 14, 15:50 UTC1h 0m
2026-06-14 N108HF ISP → ISP Jun 14, 12:45 UTCJun 14, 13:55 UTC1h 10m
2026-06-14 N108HF ISP → ISP Jun 14, 01:25 UTCJun 14, 03:05 UTC1h 40m
2026-06-13 N108HF ISP → ISP Jun 13, 22:05 UTCJun 13, 22:55 UTC50m
2026-06-12 N108HF - Jun 12, 21:10 UTCJun 12, 22:20 UTC1h 10m
2026-06-12 N108HF - Jun 12, 19:15 UTCJun 12, 19:45 UTC30m
2026-06-12 N108HF - Jun 12, 16:35 UTCJun 12, 17:40 UTC1h 5m
2026-06-11 N108HF - Jun 11, 18:55 UTCJun 11, 19:40 UTC45m
2026-06-11 N108HF - Jun 11, 17:10 UTCJun 11, 17:35 UTC25m
2026-06-11 N108HF - Jun 11, 13:35 UTCJun 11, 14:20 UTC45m
2026-06-10 N108HF - Jun 10, 16:55 UTCJun 10, 17:50 UTC55m
2026-06-10 N108HF ISP → ISP Jun 10, 15:25 UTCJun 10, 15:50 UTC25m
2026-06-10 N108HF ISP → ISP Jun 10, 13:00 UTCJun 10, 13:45 UTC45m
2026-06-10 N108HF - Jun 10, 01:10 UTCJun 10, 02:20 UTC1h 10m
2026-06-09 N108HF - Jun 9, 18:00 UTCJun 9, 18:50 UTC50m
2026-06-09 N108HF - Jun 9, 15:40 UTCJun 9, 15:50 UTC10m
2026-06-09 N108HF - Jun 9, 13:50 UTCJun 9, 14:40 UTC50m
2026-06-08 N108HF - Jun 8, 19:45 UTCJun 8, 20:55 UTC1h 10m
2026-06-08 N108HF - Jun 8, 16:45 UTCJun 8, 17:50 UTC1h 5m
2026-06-08 N108HF - Jun 8, 14:50 UTCJun 8, 15:35 UTC45m

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 N108HF page for operator, model, and routing details .

Mode-S A02321 frequently asked

What is Mode-S code A02321?
A02321 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N108HF.
Where is Mode-S A02321 registered?
Mode-S code A02321 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 A02321 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A02321, octal 50021441, decimal 10,494,753.
What flights does A02321 operate?
Mode-S A02321 has broadcast 1 distinct callsign, including N108HF.