Apparatus

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sensors Mode-S transponder

AD81CF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N97FF · operated by PEREGRINE HOWARD AVIATION LLC

Hex
AD81CF
Octal
53300717
Decimal
11,370,959
Country
US
Tail
N97FF
Type
C172
No current signal · last broadcast Jul 26, 15:50 UTC
Flights observed
261
Distinct callsigns
1
Country
US
Last broadcast
Jul 26, 15:50 UTC

Last known position

Most recent position reported by Mode-S AD81CF.

Country allocation

The ICAO 24-bit address AD81CF 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
N97FF - 261 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N97FF BJC → BJC Jul 26, 14:45 UTCJul 26, 15:50 UTC1h 5m
2026-07-25 N97FF BJC → BJC Jul 25, 17:55 UTCJul 25, 18:25 UTC30m
2026-07-25 N97FF BJC → BJC Jul 25, 15:10 UTCJul 25, 16:45 UTC1h 35m
2026-07-25 N97FF BJC → BJC Jul 25, 11:55 UTCJul 25, 13:30 UTC1h 35m
2026-07-24 N97FF BJC → BJC Jul 24, 17:40 UTCJul 24, 19:20 UTC1h 40m
2026-07-24 N97FF BJC → BJC Jul 24, 12:05 UTCJul 24, 13:25 UTC1h 20m
2026-07-24 N97FF BJC → BJC Jul 24, 00:45 UTCJul 24, 02:10 UTC1h 25m
2026-07-23 N97FF BJC → BJC Jul 23, 18:25 UTCJul 23, 20:10 UTC1h 45m
2026-07-23 N97FF BJC → BJC Jul 23, 14:05 UTCJul 23, 15:30 UTC1h 25m
2026-07-22 N97FF BJC → BJC Jul 22, 17:50 UTCJul 22, 18:25 UTC35m
2026-07-22 N97FF BJC → BJC Jul 22, 15:15 UTCJul 22, 16:25 UTC1h 10m
2026-07-22 N97FF BJC → BJC Jul 22, 12:50 UTCJul 22, 14:15 UTC1h 25m
2026-07-21 N97FF BJC → BJC Jul 21, 21:45 UTCJul 21, 22:15 UTC30m
2026-07-21 N97FF BJC → BJC Jul 21, 18:45 UTCJul 21, 19:55 UTC1h 10m
2026-07-21 N97FF BJC → BJC Jul 21, 16:15 UTCJul 21, 17:40 UTC1h 25m
2026-07-21 N97FF BJC → BJC Jul 21, 13:50 UTCJul 21, 15:20 UTC1h 30m
2026-07-21 N97FF BJC → BJC Jul 21, 02:35 UTCJul 21, 03:55 UTC1h 20m
2026-07-20 N97FF BJC → BJC Jul 20, 16:05 UTCJul 20, 17:05 UTC1h 0m
2026-07-20 N97FF BJC → BJC Jul 20, 13:35 UTCJul 20, 15:00 UTC1h 25m
2026-07-19 N97FF BJC → BJC Jul 19, 14:40 UTCJul 19, 16:25 UTC1h 45m
2026-07-19 N97FF BJC → BJC Jul 19, 12:15 UTCJul 19, 13:00 UTC45m
2026-07-19 N97FF FNL → BJC Jul 19, 00:00 UTCJul 19, 00:55 UTC55m
2026-07-18 N97FF BJC → FNL Jul 18, 21:20 UTCJul 18, 21:45 UTC25m
2026-07-18 N97FF BJC → BJC Jul 18, 18:40 UTCJul 18, 19:30 UTC50m
2026-07-18 N97FF BJC → BJC Jul 18, 16:00 UTCJul 18, 16:50 UTC50m
2026-07-18 N97FF - Jul 18, 14:05 UTCJul 18, 14:15 UTC10m
2026-07-18 N97FF BJC → BJC Jul 18, 12:40 UTCJul 18, 13:45 UTC1h 5m
2026-07-18 N97FF BJC → BJC Jul 18, 01:25 UTCJul 18, 03:50 UTC2h 26m
2026-07-17 N97FF BJC → BJC Jul 17, 21:20 UTCJul 17, 22:05 UTC45m
2026-07-17 N97FF BJC → BJC Jul 17, 12:35 UTCJul 17, 15:29 UTC2h 55m
2026-07-16 N97FF BJC → BJC Jul 16, 18:44 UTCJul 16, 20:05 UTC1h 20m
2026-07-16 N97FF BJC → BJC Jul 16, 14:29 UTCJul 16, 15:35 UTC1h 5m
2026-07-16 N97FF - Jul 16, 04:15 UTCJul 16, 05:05 UTC50m
2026-07-16 N97FF - Jul 16, 02:25 UTCJul 16, 03:15 UTC50m
2026-07-15 N97FF BJC → BJC Jul 15, 21:45 UTCJul 15, 23:45 UTC2h 0m
2026-07-15 N97FF BJC → BJC Jul 15, 15:40 UTCJul 15, 16:50 UTC1h 10m
2026-07-15 N97FF BJC → BJC Jul 15, 11:45 UTCJul 15, 14:15 UTC2h 30m
2026-07-15 N97FF BJC → BJC Jul 15, 02:55 UTCJul 15, 04:25 UTC1h 30m
2026-07-14 N97FF BJC → BJC Jul 14, 23:00 UTCJul 14, 23:30 UTC30m
2026-07-07 N97FF BJC → BJC Jul 7, 12:25 UTCJul 7, 13:50 UTC1h 25m
2026-07-07 N97FF COS → BJC Jul 7, 05:45 UTCJul 7, 06:25 UTC40m
2026-07-07 N97FF BJC → COS Jul 7, 03:25 UTCJul 7, 05:05 UTC1h 40m
2026-07-07 N97FF BJC → BJC Jul 7, 01:20 UTCJul 7, 01:50 UTC30m
2026-07-06 N97FF BJC → BJC Jul 6, 21:50 UTCJul 6, 23:05 UTC1h 15m
2026-07-06 N97FF BJC → BJC Jul 6, 18:55 UTCJul 6, 19:50 UTC55m
2026-07-06 N97FF BJC → BJC Jul 6, 16:05 UTCJul 6, 17:35 UTC1h 30m
2026-07-06 N97FF BJC → BJC Jul 6, 14:00 UTCJul 6, 14:45 UTC45m
2026-07-05 N97FF BJC → BJC Jul 5, 18:25 UTCJul 5, 19:40 UTC1h 15m
2026-07-05 N97FF BJC → BJC Jul 5, 14:55 UTCJul 5, 16:20 UTC1h 25m
2026-07-03 N97FF BJC → BJC Jul 3, 15:30 UTCJul 3, 16:50 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 N97FF page for operator, model, and routing details .

Mode-S AD81CF frequently asked

What is Mode-S code AD81CF?
AD81CF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N97FF.
Where is Mode-S AD81CF registered?
Mode-S code AD81CF 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 AD81CF broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 15:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AD81CF, octal 53300717, decimal 11,370,959.
What flights does AD81CF operate?
Mode-S AD81CF has broadcast 1 distinct callsign, including N97FF.