Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

ACD8CF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N927GP · CESSNA 172 Skyhawk · operated by CHRISTIANSEN AVIATION LLC

Hex
ACD8CF
Octal
53154317
Decimal
11,327,695
Country
US
Tail
N927GP
Type
C172
No current signal · last broadcast 22d ago
Flights observed
76
Distinct callsigns
1
Country
US
Last broadcast
22d ago

Last known position

Most recent position reported by Mode-S ACD8CF.

Country allocation

The ICAO 24-bit address ACD8CF 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
OST13 - 76 2026-06-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-26 OST13 - Jun 26, 20:20 UTCJun 26, 21:15 UTC55m
2026-06-26 OST13 - Jun 26, 17:54 UTCJun 26, 19:14 UTC1h 20m
2026-06-26 OST13 - Jun 26, 14:09 UTCJun 26, 15:15 UTC1h 5m
2026-06-24 OST13 - Jun 24, 23:50 UTCJun 25, 00:55 UTC1h 5m
2026-06-24 OST13 - Jun 24, 20:54 UTCJun 24, 22:04 UTC1h 10m
2026-06-23 OST13 - Jun 23, 00:15 UTCJun 23, 00:54 UTC40m
2026-06-19 OST13 - Jun 19, 21:39 UTCJun 19, 22:14 UTC35m
2026-06-19 OST13 - Jun 19, 19:45 UTCJun 19, 20:44 UTC1h 0m
2026-06-17 OST13 SWO → SWO Jun 17, 23:50 UTCJun 18, 01:00 UTC1h 10m
2026-06-17 OST13 - Jun 17, 14:50 UTCJun 17, 15:40 UTC50m
2026-06-16 OST13 - Jun 16, 21:30 UTCJun 16, 22:10 UTC40m
2026-06-16 OST13 - Jun 16, 02:40 UTCJun 16, 05:34 UTC2h 55m
2026-06-15 OST13 SWO → SWO Jun 15, 22:05 UTCJun 15, 22:54 UTC50m
2026-06-15 OST13 - Jun 15, 20:04 UTCJun 15, 20:40 UTC35m
2026-06-15 OST13 - Jun 15, 15:59 UTCJun 15, 16:59 UTC1h 0m
2026-06-12 OST13 - Jun 12, 23:10 UTCJun 12, 23:55 UTC45m
2026-06-12 OST13 - Jun 12, 16:00 UTCJun 12, 16:30 UTC30m
2026-06-09 OST13 - Jun 9, 03:10 UTCJun 9, 03:35 UTC25m
2026-06-09 OST13 - Jun 9, 02:30 UTCJun 9, 03:05 UTC35m
2026-06-09 OST13 - Jun 9, 00:00 UTCJun 9, 01:15 UTC1h 15m
2026-06-06 OST13 SWO → SWO Jun 6, 00:05 UTCJun 6, 00:25 UTC20m
2026-06-04 OST13 - Jun 4, 23:30 UTCJun 5, 00:45 UTC1h 15m
2026-06-04 OST13 - Jun 4, 18:35 UTCJun 4, 19:15 UTC40m
2026-06-04 OST13 - Jun 4, 15:25 UTCJun 4, 16:25 UTC1h 0m
2026-06-04 OST13 - Jun 4, 13:05 UTCJun 4, 13:50 UTC45m
2026-06-03 OST13 - Jun 3, 14:25 UTCJun 3, 15:20 UTC55m
2026-06-03 OST13 - Jun 3, 02:25 UTCJun 3, 04:40 UTC2h 15m
2026-06-02 OST13 SWO → SWO Jun 2, 19:15 UTCJun 2, 20:10 UTC55m
2026-06-01 OST13 - Jun 1, 23:30 UTCJun 2, 00:05 UTC35m
2026-06-01 OST13 - Jun 1, 21:15 UTCJun 1, 22:20 UTC1h 5m
2026-05-31 OST13 - May 31, 15:05 UTCMay 31, 16:10 UTC1h 5m
2026-05-30 OST13 SWO → SWO May 30, 21:45 UTCMay 30, 23:25 UTC1h 40m
2026-05-30 OST13 - May 30, 14:10 UTCMay 30, 15:00 UTC50m
2026-05-29 OST13 - May 29, 22:30 UTCMay 29, 23:45 UTC1h 15m
2026-05-29 OST13 - May 29, 18:10 UTCMay 29, 19:20 UTC1h 10m
2026-05-28 OST13 - May 28, 22:00 UTCMay 28, 23:10 UTC1h 10m
2026-05-28 OST13 - May 28, 19:05 UTCMay 28, 20:20 UTC1h 15m
2026-05-22 OST13 - May 22, 21:25 UTCMay 22, 21:35 UTC10m
2026-05-12 OST13 - May 12, 17:45 UTCMay 12, 17:55 UTC10m
2026-05-11 OST13 - May 11, 15:25 UTCMay 11, 16:25 UTC1h 0m
2026-05-07 OST13 - May 7, 19:55 UTCMay 7, 20:30 UTC35m
2026-05-07 OST13 - May 7, 17:45 UTCMay 7, 18:00 UTC15m
2026-05-07 OST13 - May 7, 14:00 UTCMay 7, 14:45 UTC45m
2026-05-06 OST13 - May 6, 19:20 UTCMay 6, 20:05 UTC45m
2026-05-06 OST13 - May 6, 17:30 UTCMay 6, 18:05 UTC34m
2026-05-06 OST13 - May 6, 14:50 UTCMay 6, 16:05 UTC1h 15m
2026-05-05 OST13 - May 5, 02:05 UTCMay 5, 02:55 UTC50m
2026-05-04 OST13 - May 4, 20:55 UTCMay 4, 23:10 UTC2h 15m
2026-05-04 OST13 - May 4, 18:50 UTCMay 4, 19:10 UTC20m
2026-05-04 OST13 - May 4, 16:20 UTCMay 4, 16:50 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 N927GP page for operator, model, and routing details .

Mode-S ACD8CF frequently asked

What is Mode-S code ACD8CF?
ACD8CF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N927GP.
Where is Mode-S ACD8CF registered?
Mode-S code ACD8CF 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 ACD8CF broadcasting right now?
No active broadcast right now. Last signal was 22d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ACD8CF, octal 53154317, decimal 11,327,695.
What flights does ACD8CF operate?
Mode-S ACD8CF has broadcast 1 distinct callsign, including OST13.