Apparatus

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sensors Mode-S transponder

ACD9CE

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N927SU · PIPER PA-44 Seminole · operated by OHIO STATE UNIVERSITY

Hex
ACD9CE
Octal
53154716
Decimal
11,327,950
Country
US
Tail
N927SU
Type
PA44
No current signal · last broadcast Jul 25, 17:20 UTC
Flights observed
72
Distinct callsigns
1
Country
US
Last broadcast
Jul 25, 17:20 UTC

Last known position

Most recent position reported by Mode-S ACD9CE.

Country allocation

The ICAO 24-bit address ACD9CE 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
OSU27 - 72 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 OSU27 - Jul 25, 14:35 UTCJul 25, 17:20 UTC2h 45m
2026-07-25 OSU27 - Jul 25, 12:10 UTCJul 25, 12:55 UTC45m
2026-07-24 OSU27 - Jul 24, 17:15 UTCJul 24, 18:35 UTC1h 20m
2026-07-24 OSU27 PWK → OSU Jul 24, 02:15 UTCJul 24, 04:20 UTC2h 5m
2026-07-23 OSU27 - Jul 23, 22:55 UTCJul 24, 00:55 UTC2h 0m
2026-07-23 OSU27 - Jul 23, 20:45 UTCJul 23, 21:45 UTC1h 0m
2026-07-23 OSU27 - Jul 23, 12:20 UTCJul 23, 13:25 UTC1h 5m
2026-07-19 OSU27 - Jul 19, 17:35 UTCJul 19, 19:40 UTC2h 5m
2026-07-19 OSU27 - Jul 19, 13:30 UTCJul 19, 15:55 UTC2h 25m
2026-07-16 OSU27 - Jul 16, 23:25 UTCJul 17, 01:45 UTC2h 20m
2026-07-16 OSU27 - Jul 16, 19:45 UTCJul 16, 21:55 UTC2h 10m
2026-07-16 OSU27 - Jul 16, 02:05 UTCJul 16, 02:35 UTC30m
2026-07-15 OSU27 - Jul 15, 21:05 UTCJul 15, 21:50 UTC45m
2026-07-15 OSU27 - Jul 15, 02:05 UTCJul 15, 02:35 UTC30m
2026-07-14 OSU27 - Jul 14, 21:35 UTCJul 14, 22:30 UTC55m
2026-07-08 OSU27 - Jul 8, 17:50 UTCJul 8, 19:00 UTC1h 10m
2026-07-08 OSU27 - Jul 8, 12:05 UTCJul 8, 13:25 UTC1h 20m
2026-07-07 OSU27 - Jul 7, 20:45 UTCJul 7, 22:00 UTC1h 15m
2026-07-02 OSU27 - Jul 2, 19:50 UTCJul 2, 20:55 UTC1h 5m
2026-07-01 OSU27 - Jul 1, 22:55 UTCJul 1, 23:50 UTC55m
2026-07-01 OSU27 - Jul 1, 18:25 UTCJul 1, 19:25 UTC1h 0m
2026-06-30 OSU27 - Jun 30, 23:05 UTCJul 1, 01:00 UTC1h 55m
2026-06-30 OSU27 - Jun 30, 19:05 UTCJun 30, 20:05 UTC1h 0m
2026-06-29 OSU27 - Jun 29, 20:40 UTCJun 29, 21:44 UTC1h 5m
2026-06-29 OSU27 - Jun 29, 18:34 UTCJun 29, 19:39 UTC1h 5m
2026-06-29 OSU27 - Jun 29, 17:05 UTCJun 29, 17:30 UTC25m
2026-06-29 OSU27 - Jun 29, 15:19 UTCJun 29, 15:54 UTC35m
2026-06-29 OSU27 - Jun 29, 13:19 UTCJun 29, 14:04 UTC45m
2026-06-24 OSU27 - Jun 24, 23:20 UTCJun 25, 00:35 UTC1h 15m
2026-06-24 OSU27 - Jun 24, 20:54 UTCJun 24, 22:10 UTC1h 15m
2026-06-24 OSU27 - Jun 24, 18:44 UTCJun 24, 19:49 UTC1h 5m
2026-06-24 OSU27 - Jun 24, 01:55 UTCJun 24, 02:30 UTC35m
2026-06-23 OSU27 - Jun 23, 23:14 UTCJun 24, 00:09 UTC55m
2026-06-23 OSU27 - Jun 23, 21:10 UTCJun 23, 22:19 UTC1h 10m
2026-06-23 OSU27 - Jun 23, 19:10 UTCJun 23, 19:55 UTC45m
2026-06-23 OSU27 - Jun 23, 16:44 UTCJun 23, 17:50 UTC1h 5m
2026-06-21 OSU27 - Jun 21, 18:10 UTCJun 21, 19:29 UTC1h 20m
2026-06-21 OSU27 - Jun 21, 14:10 UTCJun 21, 15:40 UTC1h 30m
2026-06-16 OSU27 - Jun 16, 14:20 UTCJun 16, 15:24 UTC1h 5m
2026-06-16 OSU27 - Jun 16, 02:34 UTCJun 16, 03:55 UTC1h 20m
2026-06-15 OSU27 - Jun 15, 23:30 UTCJun 16, 01:25 UTC1h 55m
2026-06-15 OSU27 - Jun 15, 21:04 UTCJun 15, 22:25 UTC1h 20m
2026-06-15 OSU27 - Jun 15, 18:29 UTCJun 15, 20:00 UTC1h 30m
2026-06-15 OSU27 - Jun 15, 12:15 UTCJun 15, 13:25 UTC1h 10m
2026-06-13 OSU27 - Jun 13, 23:10 UTCJun 14, 00:45 UTC1h 35m
2026-06-12 OSU27 - Jun 12, 22:50 UTCJun 13, 00:05 UTC1h 15m
2026-06-12 OSU27 - Jun 12, 18:50 UTCJun 12, 20:05 UTC1h 15m
2026-06-12 OSU27 - Jun 12, 16:45 UTCJun 12, 17:45 UTC1h 0m
2026-06-12 OSU27 - Jun 12, 12:25 UTCJun 12, 13:30 UTC1h 5m
2026-06-11 OSU27 - Jun 11, 20:45 UTCJun 11, 22:05 UTC1h 20m

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 N927SU page for operator, model, and routing details .

Mode-S ACD9CE frequently asked

What is Mode-S code ACD9CE?
ACD9CE is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N927SU.
Where is Mode-S ACD9CE registered?
Mode-S code ACD9CE 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 ACD9CE broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 17:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ACD9CE, octal 53154716, decimal 11,327,950.
What flights does ACD9CE operate?
Mode-S ACD9CE has broadcast 1 distinct callsign, including OSU27.