Apparatus

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sensors Mode-S transponder

A9975D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N717PK · DIAMOND DA-40 Club Star · operated by PK AIR LLC

Hex
A9975D
Octal
52313535
Decimal
11,114,333
Country
US
Tail
N717PK
Type
DA40
No current signal · last broadcast 15h ago
Flights observed
44
Distinct callsigns
1
Country
US
Last broadcast
15h ago

Last known position

Most recent position reported by Mode-S A9975D.

Country allocation

The ICAO 24-bit address A9975D 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
N717PK - 44 2026-05-29

Recent flights last 44

DateFlightRouteTakeoffLandingDuration
2026-05-29 N717PK - May 29, 17:35 UTCMay 29, 17:45 UTC10m
2026-05-29 N717PK ORL → ORL May 29, 17:10 UTCMay 29, 17:20 UTC10m
2026-05-29 N717PK ORL → ORL May 29, 16:00 UTCMay 29, 16:05 UTC5m
2026-05-29 N717PK ORL → ORL May 29, 13:55 UTCMay 29, 14:20 UTC25m
2026-05-29 N717PK ORL → ORL May 29, 13:40 UTCMay 29, 13:50 UTC10m
2026-05-29 N717PK - May 29, 13:25 UTCMay 29, 13:30 UTC5m
2026-05-29 N717PK ORL → ORL May 29, 13:00 UTCMay 29, 13:10 UTC10m
2026-05-29 N717PK ORL → ORL May 29, 12:50 UTCMay 29, 12:55 UTC5m
2026-05-28 N717PK ORL → ORL May 28, 14:35 UTCMay 28, 16:05 UTC1h 30m
2026-05-27 N717PK ORL → ORL May 27, 21:45 UTCMay 27, 22:50 UTC1h 5m
2026-05-27 N717PK ORL → ORL May 27, 15:10 UTCMay 27, 15:25 UTC15m
2026-05-27 N717PK ORL → ORL May 27, 14:25 UTCMay 27, 14:35 UTC10m
2026-05-27 N717PK ORL → ORL May 27, 14:00 UTCMay 27, 14:05 UTC5m
2026-05-26 N717PK ORL → ORL May 26, 18:45 UTCMay 26, 19:10 UTC25m
2026-05-26 N717PK ORL → ORL May 26, 17:44 UTCMay 26, 18:40 UTC55m
2026-05-26 N717PK ORL → ORL May 26, 15:00 UTCMay 26, 16:45 UTC1h 45m
2026-05-25 N717PK ORL → ORL May 25, 15:35 UTCMay 25, 17:00 UTC1h 25m
2026-05-25 N717PK ORL → ORL May 25, 11:50 UTCMay 25, 13:15 UTC1h 25m
2026-05-24 N717PK ORL → ORL May 24, 13:45 UTCMay 24, 15:00 UTC1h 15m
2026-05-23 N717PK ORL → ORL May 23, 19:20 UTCMay 23, 19:25 UTC5m
2026-05-23 N717PK ORL → ORL May 23, 17:50 UTCMay 23, 19:05 UTC1h 15m
2026-05-23 N717PK ORL → ORL May 23, 15:35 UTCMay 23, 16:25 UTC50m
2026-05-22 N717PK ORL → ORL May 22, 13:25 UTCMay 22, 14:50 UTC1h 25m
2026-05-19 N717PK ORL → ORL May 19, 16:00 UTCMay 19, 17:05 UTC1h 5m
2026-05-18 N717PK ORL → ORL May 18, 15:00 UTCMay 18, 16:15 UTC1h 15m
2026-05-17 N717PK - May 17, 16:40 UTCMay 17, 18:10 UTC1h 30m
2026-05-16 N717PK - May 16, 14:55 UTCMay 16, 16:15 UTC1h 20m
2026-05-15 N717PK ORL → ORL May 15, 22:50 UTCMay 15, 23:40 UTC50m
2026-05-15 N717PK ORL → ORL May 15, 17:45 UTCMay 15, 19:40 UTC1h 55m
2026-05-15 N717PK - May 15, 14:20 UTCMay 15, 15:05 UTC44m
2026-05-15 N717PK - May 15, 13:10 UTCMay 15, 13:45 UTC35m
2026-05-14 N717PK - May 14, 22:10 UTCMay 15, 00:10 UTC2h 0m
2026-05-14 N717PK - May 14, 18:15 UTCMay 14, 18:30 UTC15m
2026-05-14 N717PK - May 14, 16:55 UTCMay 14, 17:30 UTC35m
2026-05-06 N717PK ORL → ORL May 6, 18:05 UTCMay 6, 19:45 UTC1h 40m
2026-05-06 N717PK ORL → ORL May 6, 14:50 UTCMay 6, 15:55 UTC1h 5m
2026-05-05 N717PK ORL → ORL May 5, 14:40 UTCMay 5, 15:55 UTC1h 15m
2026-05-04 N717PK - May 4, 21:10 UTCMay 4, 21:15 UTC5m
2026-05-04 N717PK ORL → ORL May 4, 20:45 UTCMay 4, 20:50 UTC5m
2026-05-04 N717PK ORL → ORL May 4, 20:15 UTCMay 4, 20:20 UTC5m
2026-05-04 N717PK ORL → ORL May 4, 20:05 UTCMay 4, 20:10 UTC5m
2026-05-04 N717PK ORL → ORL May 4, 17:10 UTCMay 4, 18:00 UTC50m
2026-05-04 N717PK - May 4, 15:40 UTCMay 4, 15:50 UTC10m
2026-04-14 N717PK - Apr 14, 17:00 UTCApr 14, 17:10 UTC10m

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 N717PK page for operator, model, and routing details .

Mode-S A9975D frequently asked

What is Mode-S code A9975D?
A9975D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N717PK.
Where is Mode-S A9975D registered?
Mode-S code A9975D 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 A9975D broadcasting right now?
No active broadcast right now. Last signal was 15h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9975D, octal 52313535, decimal 11,114,333.
What flights does A9975D operate?
Mode-S A9975D has broadcast 1 distinct callsign, including N717PK.