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sensors Mode-S transponder

ACC861

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N9223H · CESSNA 172 Skyhawk · operated by HALLOCK ROBERT C III

Hex
ACC861
Octal
53144141
Decimal
11,323,489
Country
US
Tail
N9223H
Type
C172
No current signal · last broadcast Jul 26, 16:50 UTC
Flights observed
43
Distinct callsigns
1
Country
US
Last broadcast
Jul 26, 16:50 UTC

Last known position

Most recent position reported by Mode-S ACC861.

Country allocation

The ICAO 24-bit address ACC861 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
N9223H - 43 2026-07-26

Recent flights last 43

DateFlightRouteTakeoffLandingDuration
2026-07-26 N9223H - Jul 26, 16:15 UTCJul 26, 16:50 UTC35m
2026-07-26 N9223H - Jul 26, 14:40 UTCJul 26, 16:05 UTC1h 25m
2026-07-25 N9223H - Jul 25, 16:45 UTCJul 25, 18:15 UTC1h 30m
2026-07-24 N9223H - Jul 24, 18:10 UTCJul 24, 18:30 UTC20m
2026-07-24 N9223H - Jul 24, 16:30 UTCJul 24, 16:45 UTC15m
2026-07-23 N9223H - Jul 23, 17:15 UTCJul 23, 18:20 UTC1h 5m
2026-07-08 N9223H - Jul 8, 19:20 UTCJul 8, 19:35 UTC15m
2026-07-08 N9223H - Jul 8, 18:00 UTCJul 8, 18:15 UTC15m
2026-07-05 N9223H - Jul 5, 18:00 UTCJul 5, 18:15 UTC15m
2026-07-05 N9223H - Jul 5, 16:45 UTCJul 5, 17:00 UTC15m
2026-07-04 N9223H - Jul 4, 11:10 UTCJul 4, 13:10 UTC2h 0m
2026-07-03 N9223H - Jul 3, 13:05 UTCJul 3, 13:45 UTC40m
2026-07-03 N9223H - Jul 3, 11:40 UTCJul 3, 12:20 UTC40m
2026-07-02 N9223H - Jul 2, 18:35 UTCJul 2, 19:05 UTC30m
2026-07-02 N9223H - Jul 2, 15:05 UTCJul 2, 15:20 UTC15m
2026-07-02 N9223H HTO → WSH Jul 2, 11:55 UTCJul 2, 12:15 UTC20m
2026-06-30 N9223H - Jun 30, 15:50 UTCJun 30, 16:00 UTC10m
2026-06-29 N9223H - Jun 29, 17:05 UTCJun 29, 17:30 UTC25m
2026-06-28 N9223H - Jun 28, 21:59 UTCJun 28, 22:20 UTC20m
2026-06-28 N9223H - Jun 28, 17:50 UTCJun 28, 18:44 UTC55m
2026-06-27 N9223H - Jun 27, 16:14 UTCJun 27, 16:35 UTC20m
2026-06-27 N9223H - Jun 27, 14:35 UTCJun 27, 15:00 UTC25m
2026-06-27 N9223H FOK → WSH Jun 27, 12:34 UTCJun 27, 12:45 UTC10m
2026-06-22 N9223H - Jun 22, 13:10 UTCJun 22, 13:54 UTC45m
2026-06-21 N9223H - Jun 21, 18:39 UTCJun 21, 20:14 UTC1h 35m
2026-06-21 N9223H - Jun 21, 14:24 UTCJun 21, 15:05 UTC40m
2026-06-21 N9223H - Jun 21, 12:04 UTCJun 21, 12:49 UTC45m
2026-06-17 N9223H - Jun 17, 17:25 UTCJun 17, 17:40 UTC15m
2026-06-17 N9223H - Jun 17, 16:25 UTCJun 17, 16:35 UTC10m
2026-06-16 N9223H - Jun 16, 15:15 UTCJun 16, 16:25 UTC1h 10m
2026-06-14 N9223H - Jun 14, 12:15 UTCJun 14, 15:45 UTC3h 30m
2026-06-13 N9223H - Jun 13, 19:25 UTCJun 13, 19:45 UTC20m
2026-06-13 N9223H - Jun 13, 14:30 UTCJun 13, 15:35 UTC1h 5m
2026-06-13 N9223H - Jun 13, 12:35 UTCJun 13, 12:50 UTC15m
2026-06-12 N9223H - Jun 12, 17:30 UTCJun 12, 17:50 UTC20m
2026-06-12 N9223H - Jun 12, 16:30 UTCJun 12, 16:50 UTC20m
2026-06-12 N9223H - Jun 12, 13:35 UTCJun 12, 15:15 UTC1h 40m
2026-06-11 N9223H - Jun 11, 16:35 UTCJun 11, 17:25 UTC50m
2026-06-10 N9223H - Jun 10, 12:15 UTCJun 10, 13:10 UTC55m
2026-06-09 N9223H - Jun 9, 20:25 UTCJun 9, 20:45 UTC20m
2026-06-09 N9223H ISP → WSH Jun 9, 19:35 UTCJun 9, 19:45 UTC10m
2026-06-09 N9223H - Jun 9, 17:20 UTCJun 9, 17:35 UTC15m
2026-06-04 N9223H WSH → WSH Jun 4, 19:55 UTCJun 4, 20:20 UTC25m

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 N9223H page for operator, model, and routing details .

Mode-S ACC861 frequently asked

What is Mode-S code ACC861?
ACC861 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N9223H.
Where is Mode-S ACC861 registered?
Mode-S code ACC861 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 ACC861 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 16:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ACC861, octal 53144141, decimal 11,323,489.
What flights does ACC861 operate?
Mode-S ACC861 has broadcast 1 distinct callsign, including N9223H.