Apparatus

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sensors Mode-S transponder

AC90DE

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N909CS · CESSNA 172 Skyhawk · operated by BARBERS POINT FLIGHT SCHOOL LLC

Hex
AC90DE
Octal
53110336
Decimal
11,309,278
Country
US
Tail
N909CS
Type
C172
No current signal · last broadcast 10h ago
Flights observed
392
Distinct callsigns
1
Country
US
Last broadcast
10h ago

Last known position

Most recent position reported by Mode-S AC90DE.

Country allocation

The ICAO 24-bit address AC90DE 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
N909CS - 392 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 N909CS JRF → JRF Jul 13, 23:30 UTCJul 14, 01:55 UTC2h 25m
2026-07-13 N909CS - Jul 13, 21:25 UTCJul 13, 22:00 UTC35m
2026-07-13 N909CS - Jul 13, 02:25 UTCJul 13, 03:30 UTC1h 5m
2026-07-12 N909CS - Jul 12, 21:40 UTCJul 12, 21:50 UTC10m
2026-07-12 N909CS - Jul 12, 19:25 UTCJul 12, 19:45 UTC20m
2026-07-12 N909CS JRF → JRF Jul 12, 02:30 UTCJul 12, 04:01 UTC1h 30m
2026-07-12 N909CS - Jul 12, 00:30 UTCJul 12, 01:35 UTC1h 5m
2026-07-11 N909CS JRF → JRF Jul 11, 22:55 UTCJul 11, 23:45 UTC50m
2026-07-11 N909CS JRF → JRF Jul 11, 19:30 UTCJul 11, 19:50 UTC20m
2026-07-11 N909CS - Jul 11, 18:35 UTCJul 11, 18:55 UTC20m
2026-07-11 N909CS - Jul 11, 04:30 UTCJul 11, 05:31 UTC1h 0m
2026-07-11 N909CS - Jul 11, 02:40 UTCJul 11, 03:45 UTC1h 5m
2026-07-11 N909CS JRF → JRF Jul 11, 00:35 UTCJul 11, 01:45 UTC1h 10m
2026-07-10 N909CS - Jul 10, 22:40 UTCJul 10, 23:40 UTC1h 0m
2026-07-10 N909CS JRF → JRF Jul 10, 20:50 UTCJul 10, 21:35 UTC45m
2026-07-10 N909CS - Jul 10, 19:15 UTCJul 10, 19:35 UTC20m
2026-07-10 N909CS - Jul 10, 18:30 UTCJul 10, 18:40 UTC10m
2026-07-10 N909CS JRF → JRF Jul 10, 03:10 UTCJul 10, 04:15 UTC1h 5m
2026-07-10 N909CS - Jul 10, 01:15 UTCJul 10, 01:50 UTC35m
2026-07-09 N909CS - Jul 9, 22:40 UTCJul 9, 23:45 UTC1h 5m
2026-07-09 N909CS - Jul 9, 18:50 UTCJul 9, 19:05 UTC15m
2026-07-09 N909CS - Jul 9, 02:35 UTCJul 9, 03:45 UTC1h 10m
2026-07-08 N909CS JRF → JRF Jul 8, 23:00 UTCJul 9, 00:10 UTC1h 10m
2026-07-08 N909CS JRF → JRF Jul 8, 20:15 UTCJul 8, 21:30 UTC1h 15m
2026-07-08 N909CS - Jul 8, 04:20 UTCJul 8, 05:45 UTC1h 25m
2026-07-07 N909CS JRF → JRF Jul 7, 20:40 UTCJul 7, 21:40 UTC1h 0m
2026-07-07 N909CS - Jul 7, 19:10 UTCJul 7, 19:50 UTC40m
2026-07-07 N909CS JRF → JRF Jul 7, 16:40 UTCJul 7, 17:40 UTC1h 0m
2026-07-07 N909CS - Jul 7, 03:30 UTCJul 7, 03:45 UTC15m
2026-07-07 N909CS JRF → JRF Jul 7, 01:00 UTCJul 7, 02:00 UTC1h 0m
2026-07-06 N909CS - Jul 6, 20:55 UTCJul 6, 22:50 UTC1h 55m
2026-07-06 N909CS - Jul 6, 17:45 UTCJul 6, 18:30 UTC45m
2026-07-04 N909CS JRF → JRF Jul 4, 20:30 UTCJul 4, 21:50 UTC1h 20m
2026-07-04 N909CS JRF → JRF Jul 4, 05:40 UTCJul 4, 06:25 UTC45m
2026-07-04 N909CS - Jul 4, 01:50 UTCJul 4, 02:30 UTC40m
2026-07-03 N909CS JRF → JRF Jul 3, 23:40 UTCJul 4, 00:40 UTC1h 0m
2026-07-02 N909CS - Jul 2, 23:50 UTCJul 3, 01:15 UTC1h 25m
2026-07-02 N909CS JRF → JRF Jul 2, 21:45 UTCJul 2, 22:50 UTC1h 5m
2026-07-02 N909CS - Jul 2, 18:45 UTCJul 2, 20:15 UTC1h 30m
2026-07-02 N909CS - Jul 2, 01:50 UTCJul 2, 02:55 UTC1h 5m
2026-07-01 N909CS - Jul 1, 22:45 UTCJul 2, 00:50 UTC2h 5m
2026-07-01 N909CS - Jul 1, 19:40 UTCJul 1, 21:50 UTC2h 10m
2026-07-01 N909CS JRF → JRF Jul 1, 17:30 UTCJul 1, 18:40 UTC1h 10m
2026-07-01 N909CS JRF → JRF Jul 1, 05:05 UTCJul 1, 06:40 UTC1h 35m
2026-07-01 N909CS JRF → JRF Jul 1, 00:35 UTCJul 1, 01:45 UTC1h 10m
2026-06-30 N909CS JRF → JRF Jun 30, 22:15 UTCJun 30, 23:20 UTC1h 5m
2026-06-30 N909CS - Jun 30, 18:15 UTCJun 30, 19:10 UTC55m
2026-06-30 N909CS - Jun 30, 02:10 UTCJun 30, 04:10 UTC2h 0m
2026-06-29 N909CS - Jun 29, 23:39 UTCJun 30, 00:49 UTC1h 10m
2026-06-29 N909CS - Jun 29, 17:05 UTCJun 29, 20:30 UTC3h 25m

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 N909CS page for operator, model, and routing details .

Mode-S AC90DE frequently asked

What is Mode-S code AC90DE?
AC90DE is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N909CS.
Where is Mode-S AC90DE registered?
Mode-S code AC90DE 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 AC90DE broadcasting right now?
No active broadcast right now. Last signal was 10h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC90DE, octal 53110336, decimal 11,309,278.
What flights does AC90DE operate?
Mode-S AC90DE has broadcast 1 distinct callsign, including N909CS.