Apparatus

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sensors Mode-S transponder

ADD61D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N9908K · PIPER PA-28-140/150/160/180 · operated by G&M AIRCRAFT INC

Hex
ADD61D
Octal
53353035
Decimal
11,392,541
Country
US
Tail
N9908K
Type
P28A
No current signal · last broadcast 15h ago
Flights observed
94
Distinct callsigns
1
Country
US
Last broadcast
15h ago

Last known position

Most recent position reported by Mode-S ADD61D.

Country allocation

The ICAO 24-bit address ADD61D 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
N9908K - 94 2026-05-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 N9908K - May 29, 17:55 UTCMay 29, 19:00 UTC1h 5m
2026-05-28 N9908K BJC → BJC May 28, 18:55 UTCMay 28, 19:50 UTC55m
2026-05-28 N9908K BJC → BJC May 28, 17:20 UTCMay 28, 17:50 UTC30m
2026-05-27 N9908K PUB → BJC May 27, 20:50 UTCMay 27, 21:55 UTC1h 5m
2026-05-27 N9908K - May 27, 18:10 UTCMay 27, 18:40 UTC30m
2026-05-25 N9908K - May 25, 19:59 UTCMay 25, 21:09 UTC1h 10m
2026-05-25 N9908K - May 25, 17:10 UTCMay 25, 18:20 UTC1h 10m
2026-05-25 N9908K BJC → BJC May 25, 12:00 UTCMay 25, 14:05 UTC2h 5m
2026-05-24 N9908K - May 24, 23:45 UTCMay 24, 23:46 UTC1m
2026-05-24 N9908K - May 24, 17:30 UTCMay 24, 18:25 UTC55m
2026-05-24 N9908K - May 24, 14:50 UTCMay 24, 16:40 UTC1h 50m
2026-05-24 N9908K - May 24, 01:35 UTCMay 24, 02:15 UTC40m
2026-05-23 N9908K BJC → BJC May 23, 22:45 UTCMay 23, 23:55 UTC1h 10m
2026-05-23 N9908K BJC → BJC May 23, 15:40 UTCMay 23, 17:30 UTC1h 50m
2026-05-23 N9908K BJC → BJC May 23, 13:05 UTCMay 23, 14:20 UTC1h 15m
2026-05-21 N9908K BJC → BJC May 21, 22:35 UTCMay 21, 23:35 UTC1h 0m
2026-05-21 N9908K - May 21, 20:20 UTCMay 21, 21:15 UTC55m
2026-05-21 N9908K - May 21, 14:35 UTCMay 21, 16:01 UTC1h 25m
2026-05-21 N9908K BJC → BJC May 21, 13:05 UTCMay 21, 13:55 UTC50m
2026-05-21 N9908K - May 21, 00:45 UTCMay 21, 01:50 UTC1h 5m
2026-05-21 N9908K - May 21, 00:25 UTCMay 21, 00:40 UTC15m
2026-05-16 N9908K - May 16, 15:45 UTCMay 16, 17:30 UTC1h 45m
2026-05-16 N9908K - May 16, 14:11 UTCMay 16, 14:31 UTC20m
2026-05-16 N9908K - May 16, 13:25 UTCMay 16, 14:05 UTC40m
2026-05-16 N9908K - May 16, 13:05 UTCMay 16, 13:21 UTC15m
2026-05-15 N9908K - May 15, 23:55 UTCMay 16, 01:40 UTC1h 45m
2026-05-15 N9908K BJC → BJC May 15, 19:50 UTCMay 15, 21:30 UTC1h 40m
2026-05-15 N9908K BJC → BJC May 15, 17:50 UTCMay 15, 19:00 UTC1h 10m
2026-05-15 N9908K BJC → BJC May 15, 15:50 UTCMay 15, 16:40 UTC50m
2026-05-15 N9908K BJC → BJC May 15, 12:55 UTCMay 15, 14:40 UTC1h 45m
2026-05-15 N9908K BJC → BJC May 15, 02:40 UTCMay 15, 04:15 UTC1h 35m
2026-05-14 N9908K BJC → BJC May 14, 19:00 UTCMay 14, 20:45 UTC1h 45m
2026-05-14 N9908K BJC → BJC May 14, 16:00 UTCMay 14, 17:55 UTC1h 55m
2026-05-14 N9908K BJC → BJC May 14, 13:40 UTCMay 14, 14:10 UTC30m
2026-05-13 N9908K BJC → BJC May 13, 23:30 UTCMay 14, 01:10 UTC1h 40m
2026-05-13 N9908K BJC → BJC May 13, 19:55 UTCMay 13, 20:35 UTC40m
2026-05-13 N9908K BJC → BJC May 13, 17:55 UTCMay 13, 18:55 UTC1h 0m
2026-05-13 N9908K BJC → BJC May 13, 14:40 UTCMay 13, 15:55 UTC1h 15m
2026-05-12 N9908K - May 12, 18:10 UTCMay 12, 19:50 UTC1h 40m
2026-05-12 N9908K BJC → BJC May 12, 15:30 UTCMay 12, 16:10 UTC40m
2026-05-11 N9908K BJC → BJC May 11, 18:55 UTCMay 11, 19:40 UTC45m
2026-05-10 N9908K BJC → BJC May 10, 22:30 UTCMay 11, 00:00 UTC1h 30m
2026-05-10 N9908K BJC → BJC May 10, 19:45 UTCMay 10, 21:44 UTC2h 0m
2026-05-09 N9908K - May 9, 20:44 UTCMay 9, 22:34 UTC1h 50m
2026-05-09 N9908K BJC → BJC May 9, 18:35 UTCMay 9, 19:49 UTC1h 15m
2026-05-08 N9908K BJC → BJC May 8, 21:40 UTCMay 8, 23:15 UTC1h 35m
2026-05-08 N9908K BJC → BJC May 8, 17:35 UTCMay 8, 18:20 UTC45m
2026-05-08 N9908K - May 8, 14:45 UTCMay 8, 15:40 UTC55m
2026-05-08 N9908K BJC → BJC May 8, 13:35 UTCMay 8, 13:55 UTC20m
2026-05-08 N9908K BJC → BJC May 8, 12:39 UTCMay 8, 13:20 UTC40m

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 N9908K page for operator, model, and routing details .

Mode-S ADD61D frequently asked

What is Mode-S code ADD61D?
ADD61D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N9908K.
Where is Mode-S ADD61D registered?
Mode-S code ADD61D 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 ADD61D 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 ADD61D, octal 53353035, decimal 11,392,541.
What flights does ADD61D operate?
Mode-S ADD61D has broadcast 1 distinct callsign, including N9908K.