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sensors Mode-S transponder

AC7121

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N900WA · CESSNA 208 Caravan · operated by WRIGHT AIR SERVICE INC

Hex
AC7121
Octal
53070441
Decimal
11,301,153
Country
US
Tail
N900WA
Type
C208
No current signal · last broadcast 13h ago
Flights observed
274
Distinct callsigns
1
Country
US
Last broadcast
13h ago

Last known position

Most recent position reported by Mode-S AC7121.

Country allocation

The ICAO 24-bit address AC7121 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
N900WA - 274 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 N900WA - Jul 14, 00:10 UTCJul 14, 00:50 UTC40m
2026-07-13 N900WA - Jul 13, 21:15 UTCJul 13, 21:55 UTC40m
2026-07-13 N900WA - Jul 13, 18:30 UTCJul 13, 19:05 UTC35m
2026-07-13 N900WA - Jul 13, 15:45 UTCJul 13, 16:15 UTC30m
2026-07-12 N900WA - Jul 12, 22:10 UTCJul 12, 22:40 UTC30m
2026-07-12 N900WA - Jul 12, 19:15 UTCJul 12, 21:15 UTC2h 0m
2026-07-12 N900WA - Jul 12, 18:10 UTCJul 12, 18:45 UTC35m
2026-07-11 N900WA - Jul 11, 21:10 UTCJul 11, 21:40 UTC30m
2026-07-11 N900WA - Jul 11, 18:00 UTCJul 11, 18:30 UTC30m
2026-07-11 N900WA - Jul 11, 01:20 UTCJul 11, 02:00 UTC40m
2026-07-10 N900WA - Jul 10, 21:00 UTCJul 10, 21:35 UTC35m
2026-07-10 N900WA - Jul 10, 18:25 UTCJul 10, 19:00 UTC35m
2026-07-10 N900WA - Jul 10, 17:10 UTCJul 10, 17:40 UTC30m
2026-07-10 N900WA - Jul 10, 02:50 UTCJul 10, 03:20 UTC30m
2026-07-09 N900WA - Jul 9, 22:05 UTCJul 9, 22:40 UTC35m
2026-07-09 N900WA - Jul 9, 01:25 UTCJul 9, 01:45 UTC20m
2026-07-08 N900WA - Jul 8, 21:45 UTCJul 8, 22:15 UTC30m
2026-07-08 N900WA - Jul 8, 19:15 UTCJul 8, 19:30 UTC15m
2026-07-08 N900WA - Jul 8, 16:00 UTCJul 8, 16:20 UTC20m
2026-07-08 N900WA - Jul 8, 02:20 UTCJul 8, 02:35 UTC15m
2026-07-07 N900WA - Jul 7, 22:25 UTCJul 7, 22:45 UTC20m
2026-07-07 N900WA - Jul 7, 19:50 UTCJul 7, 20:25 UTC35m
2026-07-07 N900WA - Jul 7, 18:25 UTCJul 7, 18:55 UTC30m
2026-07-07 N900WA - Jul 7, 17:30 UTCJul 7, 18:05 UTC35m
2026-07-07 N900WA - Jul 7, 16:20 UTCJul 7, 16:50 UTC30m
2026-07-06 N900WA - Jul 6, 23:45 UTCJul 7, 00:15 UTC30m
2026-07-06 N900WA - Jul 6, 21:20 UTCJul 6, 21:40 UTC20m
2026-07-06 N900WA - Jul 6, 19:35 UTCJul 6, 19:55 UTC20m
2026-07-06 N900WA - Jul 6, 16:15 UTCJul 6, 16:40 UTC25m
2026-07-05 N900WA - Jul 5, 22:40 UTCJul 5, 22:55 UTC15m
2026-07-05 N900WA - Jul 5, 20:10 UTCJul 5, 21:10 UTC1h 0m
2026-07-05 N900WA - Jul 5, 19:15 UTCJul 5, 19:50 UTC35m
2026-07-05 N900WA - Jul 5, 18:05 UTCJul 5, 18:40 UTC35m
2026-07-04 N900WA - Jul 4, 00:45 UTCJul 4, 01:15 UTC30m
2026-07-03 N900WA - Jul 3, 23:25 UTCJul 3, 23:55 UTC30m
2026-07-03 N900WA - Jul 3, 21:55 UTCJul 3, 22:25 UTC30m
2026-07-03 N900WA - Jul 3, 17:20 UTCJul 3, 17:50 UTC30m
2026-07-03 N900WA - Jul 3, 16:40 UTCJul 3, 16:55 UTC15m
2026-06-26 N900WA - Jun 26, 01:05 UTCJun 26, 01:34 UTC30m
2026-06-25 N900WA - Jun 25, 22:24 UTCJun 25, 22:59 UTC35m
2026-06-25 N900WA - Jun 25, 20:09 UTCJun 25, 20:45 UTC35m
2026-06-25 N900WA - Jun 25, 15:50 UTCJun 25, 16:24 UTC35m
2026-06-25 N900WA - Jun 25, 00:59 UTCJun 25, 01:35 UTC35m
2026-06-24 N900WA - Jun 24, 20:54 UTCJun 24, 21:34 UTC40m
2026-06-24 N900WA - Jun 24, 19:29 UTCJun 24, 19:49 UTC20m
2026-06-24 N900WA - Jun 24, 16:14 UTCJun 24, 16:29 UTC15m
2026-06-24 N900WA - Jun 24, 03:15 UTCJun 24, 03:40 UTC25m
2026-06-23 N900WA - Jun 23, 21:14 UTCJun 23, 21:34 UTC20m
2026-06-23 N900WA - Jun 23, 17:59 UTCJun 23, 18:20 UTC20m
2026-06-23 N900WA - Jun 23, 15:09 UTCJun 23, 15:34 UTC25m

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 N900WA page for operator, model, and routing details .

Mode-S AC7121 frequently asked

What is Mode-S code AC7121?
AC7121 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N900WA.
Where is Mode-S AC7121 registered?
Mode-S code AC7121 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 AC7121 broadcasting right now?
No active broadcast right now. Last signal was 13h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC7121, octal 53070441, decimal 11,301,153.
What flights does AC7121 operate?
Mode-S AC7121 has broadcast 1 distinct callsign, including N900WA.