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sensors Mode-S transponder

ADD905

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N9912N · CESSNA 180 Skywagon

Hex
ADD905
Octal
53354405
Decimal
11,393,285
Country
US
Tail
N9912N
Type
C180
No current signal · last broadcast Jul 26, 16:55 UTC
Flights observed
55
Distinct callsigns
1
Country
US
Last broadcast
Jul 26, 16:55 UTC

Last known position

Most recent position reported by Mode-S ADD905.

Country allocation

The ICAO 24-bit address ADD905 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
N9912N - 55 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N9912N - Jul 26, 16:20 UTCJul 26, 16:55 UTC35m
2026-07-25 N9912N - Jul 25, 19:20 UTCJul 25, 19:30 UTC10m
2026-07-19 N9912N - Jul 19, 22:45 UTCJul 19, 23:10 UTC25m
2026-07-18 N9912N - Jul 18, 19:15 UTCJul 18, 19:50 UTC35m
2026-07-17 N9912N - Jul 17, 23:55 UTCJul 18, 00:10 UTC15m
2026-07-17 N9912N - Jul 17, 01:20 UTCJul 17, 01:55 UTC35m
2026-07-16 N9912N - Jul 16, 18:34 UTCJul 16, 19:10 UTC35m
2026-07-14 N9912N - Jul 14, 00:45 UTCJul 14, 01:15 UTC30m
2026-07-13 N9912N - Jul 13, 18:05 UTCJul 13, 18:35 UTC30m
2026-07-11 N9912N - Jul 11, 00:50 UTCJul 11, 01:05 UTC15m
2026-07-08 N9912N - Jul 8, 00:25 UTCJul 8, 01:25 UTC1h 0m
2026-07-07 N9912N - Jul 7, 18:35 UTCJul 7, 19:40 UTC1h 5m
2026-07-06 N9912N - Jul 6, 21:20 UTCJul 6, 21:50 UTC30m
2026-07-06 N9912N - Jul 6, 00:25 UTCJul 6, 01:00 UTC35m
2026-07-05 N9912N - Jul 5, 23:35 UTCJul 6, 00:05 UTC30m
2026-07-03 N9912N - Jul 3, 20:35 UTCJul 3, 21:05 UTC30m
2026-07-03 N9912N - Jul 3, 19:35 UTCJul 3, 20:05 UTC30m
2026-07-03 N9912N - Jul 3, 18:30 UTCJul 3, 19:00 UTC30m
2026-06-28 N9912N - Jun 28, 23:04 UTCJun 28, 23:34 UTC30m
2026-06-28 N9912N - Jun 28, 18:25 UTCJun 28, 18:55 UTC30m
2026-06-21 N9912N - Jun 21, 23:14 UTCJun 21, 23:44 UTC30m
2026-06-20 N9912N - Jun 20, 20:14 UTCJun 20, 20:45 UTC30m
2026-06-18 N9912N - Jun 18, 02:55 UTCJun 18, 03:40 UTC45m
2026-06-17 N9912N - Jun 17, 19:40 UTCJun 17, 20:30 UTC50m
2026-06-17 N9912N - Jun 17, 18:15 UTCJun 17, 18:50 UTC35m
2026-06-16 N9912N - Jun 16, 20:15 UTCJun 16, 20:45 UTC30m
2026-06-13 N9912N - Jun 13, 00:55 UTCJun 13, 01:25 UTC30m
2026-06-12 N9912N - Jun 12, 02:50 UTCJun 12, 03:20 UTC30m
2026-06-10 N9912N - Jun 10, 21:40 UTCJun 10, 22:00 UTC20m
2026-06-10 N9912N - Jun 10, 20:15 UTCJun 10, 20:25 UTC10m
2026-06-09 N9912N - Jun 9, 21:25 UTCJun 9, 21:40 UTC15m
2026-06-09 N9912N - Jun 9, 21:00 UTCJun 9, 21:10 UTC10m
2026-06-07 N9912N - Jun 7, 17:00 UTCJun 7, 17:05 UTC5m
2026-06-07 N9912N - Jun 7, 16:50 UTCJun 7, 16:55 UTC5m
2026-06-06 N9912N - Jun 6, 01:45 UTCJun 6, 02:15 UTC30m
2026-06-05 N9912N - Jun 5, 20:45 UTCJun 5, 21:15 UTC30m
2026-06-05 N9912N - Jun 5, 00:40 UTCJun 5, 01:05 UTC25m
2026-06-04 N9912N - Jun 4, 18:20 UTCJun 4, 18:50 UTC30m
2026-06-04 N9912N - Jun 4, 01:15 UTCJun 4, 01:45 UTC30m
2026-06-03 N9912N - Jun 3, 18:15 UTCJun 3, 18:45 UTC30m
2026-06-03 N9912N - Jun 3, 00:55 UTCJun 3, 01:25 UTC30m
2026-06-02 N9912N - Jun 2, 18:30 UTCJun 2, 19:10 UTC40m
2026-06-01 N9912N - Jun 1, 00:20 UTCJun 1, 00:55 UTC35m
2026-05-31 N9912N - May 31, 17:55 UTCMay 31, 18:25 UTC30m
2026-05-30 N9912N - May 30, 23:15 UTCMay 30, 23:25 UTC10m
2026-05-30 N9912N - May 30, 22:30 UTCMay 30, 22:40 UTC10m
2026-05-26 N9912N - May 26, 22:25 UTCMay 26, 23:14 UTC50m
2026-05-26 N9912N - May 26, 19:10 UTCMay 26, 19:34 UTC25m
2026-05-26 N9912N - May 26, 00:00 UTCMay 26, 00:29 UTC30m
2026-05-25 N9912N - May 25, 23:19 UTCMay 25, 23:49 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 N9912N page for operator, model, and routing details .

Mode-S ADD905 frequently asked

What is Mode-S code ADD905?
ADD905 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N9912N.
Where is Mode-S ADD905 registered?
Mode-S code ADD905 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 ADD905 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 16:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ADD905, octal 53354405, decimal 11,393,285.
What flights does ADD905 operate?
Mode-S ADD905 has broadcast 1 distinct callsign, including N9912N.