Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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
Broadcasting now · callsign N909CS · 1,850 ft
Flights observed
212
Distinct callsigns
1
Country
US
Last broadcast
1h ago

Current position

AC90DE is currently broadcasting. Map zoomed to live position.

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 - 212 2026-05-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 N909CS - May 30, 04:20 UTCMay 30, 04:35 UTC15m
2026-05-29 N909CS JRF → JRF May 29, 22:30 UTCMay 29, 23:15 UTC45m
2026-05-29 N909CS - May 29, 20:30 UTCMay 29, 21:45 UTC1h 15m
2026-05-29 N909CS - May 29, 18:50 UTCMay 29, 19:40 UTC50m
2026-05-28 N909CS JRF → JRF May 28, 01:20 UTCMay 28, 01:50 UTC30m
2026-05-27 N909CS JRF → JRF May 27, 23:15 UTCMay 28, 00:15 UTC1h 0m
2026-05-27 N909CS - May 27, 20:40 UTCMay 27, 21:30 UTC50m
2026-05-27 N909CS JRF → JRF May 27, 00:34 UTCMay 27, 01:19 UTC45m
2026-05-25 N909CS JRF → JRF May 25, 22:40 UTCMay 25, 23:45 UTC1h 5m
2026-05-25 N909CS JRF → JRF May 25, 20:40 UTCMay 25, 21:45 UTC1h 5m
2026-05-25 N909CS JRF → JRF May 25, 18:40 UTCMay 25, 19:30 UTC49m
2026-05-24 N909CS - May 24, 19:55 UTCMay 24, 20:55 UTC1h 0m
2026-05-24 N909CS - May 24, 18:00 UTCMay 24, 19:10 UTC1h 10m
2026-05-22 N909CS JRF → JRF May 22, 22:45 UTCMay 22, 23:35 UTC50m
2026-05-22 N909CS - May 22, 20:40 UTCMay 22, 21:45 UTC1h 5m
2026-05-22 N909CS JRF → JRF May 22, 19:00 UTCMay 22, 19:45 UTC45m
2026-05-22 N909CS JRF → JRF May 22, 16:35 UTCMay 22, 17:45 UTC1h 10m
2026-05-22 N909CS - May 22, 00:25 UTCMay 22, 01:00 UTC35m
2026-05-21 N909CS - May 21, 20:20 UTCMay 21, 21:40 UTC1h 20m
2026-05-20 N909CS - May 20, 04:00 UTCMay 20, 05:55 UTC1h 56m
2026-05-20 N909CS - May 20, 01:15 UTCMay 20, 02:35 UTC1h 20m
2026-05-19 N909CS JRF → JRF May 19, 22:55 UTCMay 20, 00:25 UTC1h 30m
2026-05-19 N909CS - May 19, 22:10 UTCMay 19, 22:20 UTC10m
2026-05-19 N909CS - May 19, 21:20 UTCMay 19, 21:35 UTC15m
2026-05-19 N909CS - May 19, 19:40 UTCMay 19, 20:35 UTC55m
2026-05-19 N909CS - May 19, 17:45 UTCMay 19, 18:55 UTC1h 10m
2026-05-19 N909CS JRF → JRF May 19, 05:40 UTCMay 19, 06:25 UTC45m
2026-05-19 N909CS JRF → JRF May 19, 02:35 UTCMay 19, 03:40 UTC1h 5m
2026-05-19 N909CS JRF → JRF May 19, 00:35 UTCMay 19, 01:45 UTC1h 10m
2026-05-18 N909CS JRF → JRF May 18, 22:50 UTCMay 18, 23:40 UTC50m
2026-05-18 N909CS JRF → JRF May 18, 17:45 UTCMay 18, 18:35 UTC49m
2026-05-18 N909CS JRF → JRF May 18, 02:50 UTCMay 18, 04:11 UTC1h 20m
2026-05-18 N909CS - May 18, 01:00 UTCMay 18, 01:55 UTC55m
2026-05-17 N909CS JRF → JRF May 17, 22:45 UTCMay 17, 23:45 UTC1h 0m
2026-05-17 N909CS - May 17, 20:40 UTCMay 17, 21:55 UTC1h 15m
2026-05-17 N909CS JRF → JRF May 17, 18:35 UTCMay 17, 19:15 UTC40m
2026-05-17 N909CS JRF → JRF May 17, 16:05 UTCMay 17, 17:40 UTC1h 35m
2026-05-16 N909CS JRF → JRF May 16, 22:50 UTCMay 16, 23:50 UTC1h 0m
2026-05-16 N909CS JRF → JRF May 16, 19:45 UTCMay 16, 21:10 UTC1h 25m
2026-05-16 N909CS JRF → JRF May 16, 17:45 UTCMay 16, 18:45 UTC1h 0m
2026-05-15 N909CS JRF → JRF May 15, 20:30 UTCMay 15, 21:30 UTC1h 0m
2026-05-15 N909CS - May 15, 19:00 UTCMay 15, 19:50 UTC50m
2026-05-15 N909CS JRF → JRF May 15, 16:45 UTCMay 15, 17:45 UTC1h 0m
2026-05-15 N909CS JRF → JRF May 15, 03:25 UTCMay 15, 04:20 UTC55m
2026-05-15 N909CS JRF → JRF May 15, 00:35 UTCMay 15, 01:10 UTC35m
2026-05-14 N909CS JRF → JRF May 14, 21:45 UTCMay 14, 23:40 UTC1h 55m
2026-05-14 N909CS - May 14, 19:40 UTCMay 14, 20:45 UTC1h 5m
2026-05-14 N909CS JRF → JRF May 14, 17:50 UTCMay 14, 18:45 UTC55m
2026-05-14 N909CS - May 14, 02:30 UTCMay 14, 04:45 UTC2h 15m
2026-05-13 N909CS JRF → JRF May 13, 21:25 UTCMay 13, 22:45 UTC1h 20m

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?
Yes. Mode-S AC90DE is currently airborne.
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.