Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A171F7

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N1920F · CESSNA 172 Skyhawk · operated by CHRISTENSEN DEAN G, CHRISTENSEN MARGARET J

Hex
A171F7
Octal
50270767
Decimal
10,580,471
Country
US
Tail
N1920F
Type
C172
Transponder active on ground
Flights observed
148
Distinct callsigns
1
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S A171F7.

Country allocation

The ICAO 24-bit address A171F7 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
N1920F - 148 2026-06-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-02 N1920F - Jun 2, 21:30 UTCJun 2, 21:40 UTC10m
2026-06-02 N1920F - Jun 2, 20:40 UTCJun 2, 21:20 UTC40m
2026-06-02 N1920F SAC → SAC Jun 2, 17:50 UTCJun 2, 19:20 UTC1h 30m
2026-06-02 N1920F SAC → SAC Jun 2, 16:00 UTCJun 2, 17:00 UTC1h 0m
2026-06-02 N1920F SAC → SAC Jun 2, 00:05 UTCJun 2, 01:35 UTC1h 30m
2026-06-01 N1920F SAC → SAC Jun 1, 23:10 UTCJun 1, 23:20 UTC10m
2026-06-01 N1920F SAC → SAC Jun 1, 20:40 UTCJun 1, 21:10 UTC30m
2026-06-01 N1920F SAC → SAC Jun 1, 18:15 UTCJun 1, 19:30 UTC1h 15m
2026-06-01 N1920F SAC → SAC Jun 1, 16:45 UTCJun 1, 17:45 UTC1h 0m
2026-05-30 N1920F - May 30, 21:25 UTCMay 30, 22:50 UTC1h 25m
2026-05-30 N1920F - May 30, 20:00 UTCMay 30, 20:50 UTC50m
2026-05-30 N1920F - May 30, 18:50 UTCMay 30, 19:30 UTC40m
2026-05-30 N1920F SAC → SAC May 30, 16:55 UTCMay 30, 18:05 UTC1h 10m
2026-05-30 N1920F SAC → SAC May 30, 00:20 UTCMay 30, 01:15 UTC55m
2026-05-29 N1920F SAC → SAC May 29, 00:40 UTCMay 29, 01:35 UTC55m
2026-05-28 N1920F SAC → SAC May 28, 21:40 UTCMay 28, 22:40 UTC1h 0m
2026-05-28 N1920F SAC → SAC May 28, 02:30 UTCMay 28, 03:40 UTC1h 10m
2026-05-27 N1920F SAC → SAC May 27, 20:30 UTCMay 27, 21:20 UTC50m
2026-05-27 N1920F SAC → SAC May 27, 15:40 UTCMay 27, 16:40 UTC1h 0m
2026-05-27 N1920F - May 27, 05:14 UTCMay 27, 06:15 UTC1h 0m
2026-05-27 N1920F SAC → SAC May 27, 03:39 UTCMay 27, 04:45 UTC1h 5m
2026-05-26 N1920F SAC → SAC May 26, 22:09 UTCMay 26, 23:25 UTC1h 15m
2026-05-26 N1920F SAC → SAC May 26, 18:50 UTCMay 26, 20:00 UTC1h 10m
2026-05-24 N1920F - May 24, 23:00 UTCMay 24, 23:30 UTC30m
2026-05-24 N1920F SAC → SAC May 24, 18:00 UTCMay 24, 19:55 UTC1h 55m
2026-05-22 N1920F SAC → SAC May 22, 20:10 UTCMay 22, 21:45 UTC1h 35m
2026-05-15 N1920F SAC → SAC May 15, 21:10 UTCMay 15, 21:55 UTC45m
2026-05-15 N1920F SAC → SAC May 15, 15:15 UTCMay 15, 16:00 UTC45m
2026-05-15 N1920F SAC → SAC May 15, 01:10 UTCMay 15, 02:10 UTC1h 0m
2026-05-14 N1920F SAC → SAC May 14, 01:40 UTCMay 14, 03:25 UTC1h 45m
2026-05-13 N1920F SAC → SAC May 13, 21:15 UTCMay 13, 22:20 UTC1h 5m
2026-05-13 N1920F SAC → SAC May 13, 16:15 UTCMay 13, 17:15 UTC1h 0m
2026-05-13 N1920F - May 13, 03:20 UTCMay 13, 04:05 UTC45m
2026-05-13 N1920F SAC → MHR May 13, 02:00 UTCMay 13, 02:50 UTC50m
2026-05-12 N1920F SAC → SAC May 12, 23:30 UTCMay 13, 00:50 UTC1h 20m
2026-05-12 N1920F SAC → SAC May 12, 18:15 UTCMay 12, 19:15 UTC1h 0m
2026-05-12 N1920F - May 12, 05:15 UTCMay 12, 06:05 UTC50m
2026-05-12 N1920F - May 12, 04:10 UTCMay 12, 04:50 UTC40m
2026-05-11 N1920F - May 11, 22:15 UTCMay 11, 22:35 UTC19m
2026-05-11 N1920F SAC → SAC May 11, 17:05 UTCMay 11, 18:35 UTC1h 30m
2026-05-10 N1920F - May 10, 20:50 UTCMay 10, 21:49 UTC1h 0m
2026-05-10 N1920F - May 10, 17:10 UTCMay 10, 18:15 UTC1h 5m
2026-05-10 N1920F SAC → SAC May 10, 05:45 UTCMay 10, 06:00 UTC15m
2026-05-10 N1920F SAC → SAC May 10, 05:30 UTCMay 10, 05:40 UTC10m
2026-05-10 N1920F SAC → SAC May 10, 04:00 UTCMay 10, 05:25 UTC1h 25m
2026-05-09 N1920F SAC → SAC May 9, 20:40 UTCMay 9, 21:14 UTC35m
2026-05-09 N1920F - May 9, 18:25 UTCMay 9, 19:30 UTC1h 5m
2026-05-09 N1920F SAC → SAC May 9, 16:15 UTCMay 9, 18:00 UTC1h 45m
2026-05-08 N1920F SAC → SAC May 8, 23:40 UTCMay 9, 00:50 UTC1h 10m
2026-05-08 N1920F SAC → SAC May 8, 18:00 UTCMay 8, 18:45 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 N1920F page for operator, model, and routing details .

Mode-S A171F7 frequently asked

What is Mode-S code A171F7?
A171F7 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N1920F.
Where is Mode-S A171F7 registered?
Mode-S code A171F7 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 A171F7 broadcasting right now?
Mode-S A171F7 is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A171F7, octal 50270767, decimal 10,580,471.
What flights does A171F7 operate?
Mode-S A171F7 has broadcast 1 distinct callsign, including N1920F.