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sensors Mode-S transponder

ACC9C3

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N923ER · CESSNA 172 Skyhawk · operated by EMBRY-RIDDLE AERONAUTICAL UNIVERSITY

Hex
ACC9C3
Octal
53144703
Decimal
11,323,843
Country
US
Tail
N923ER
Type
C172
Broadcasting now · callsign ERU923 · 2,350 ft
Flights observed
228
Distinct callsigns
1
Country
US
Last broadcast
20d ago

Current position

ACC9C3 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address ACC9C3 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
ERU923 - 228 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ERU923 - Jul 26, 19:10 UTCJul 26, 19:30 UTC20m
2026-07-26 ERU923 - Jul 26, 16:10 UTCJul 26, 16:25 UTC15m
2026-07-26 ERU923 - Jul 26, 14:45 UTCJul 26, 15:05 UTC20m
2026-07-26 ERU923 - Jul 26, 11:45 UTCJul 26, 11:55 UTC10m
2026-07-26 ERU923 - Jul 26, 10:30 UTCJul 26, 11:10 UTC40m
2026-07-26 ERU923 - Jul 26, 02:35 UTCJul 26, 03:30 UTC55m
2026-07-25 ERU923 - Jul 25, 15:35 UTCJul 25, 17:20 UTC1h 45m
2026-07-25 ERU923 - Jul 25, 13:25 UTCJul 25, 14:25 UTC1h 0m
2026-07-25 ERU923 - Jul 25, 11:30 UTCJul 25, 11:55 UTC25m
2026-07-25 ERU923 - Jul 25, 10:25 UTCJul 25, 10:50 UTC25m
2026-07-25 ERU923 - Jul 25, 01:25 UTCJul 25, 02:45 UTC1h 20m
2026-07-24 ERU923 - Jul 24, 22:35 UTCJul 24, 23:10 UTC35m
2026-07-24 ERU923 - Jul 24, 19:35 UTCJul 24, 21:05 UTC1h 30m
2026-07-24 ERU923 - Jul 24, 15:05 UTCJul 24, 16:40 UTC1h 35m
2026-07-23 ERU923 - Jul 23, 17:55 UTCJul 23, 18:35 UTC40m
2026-07-23 ERU923 - Jul 23, 13:20 UTCJul 23, 14:45 UTC1h 25m
2026-07-23 ERU923 - Jul 23, 10:35 UTCJul 23, 12:10 UTC1h 35m
2026-07-23 ERU923 - Jul 23, 01:10 UTCJul 23, 02:25 UTC1h 15m
2026-07-22 ERU923 - Jul 22, 20:50 UTCJul 22, 21:50 UTC1h 0m
2026-07-22 ERU923 - Jul 22, 15:10 UTCJul 22, 16:35 UTC1h 25m
2026-07-22 ERU923 - Jul 22, 12:50 UTCJul 22, 14:05 UTC1h 15m
2026-07-21 ERU923 - Jul 21, 15:20 UTCJul 21, 16:50 UTC1h 30m
2026-07-21 ERU923 - Jul 21, 12:15 UTCJul 21, 13:30 UTC1h 15m
2026-07-20 ERU923 - Jul 20, 17:55 UTCJul 20, 19:00 UTC1h 5m
2026-07-20 ERU923 - Jul 20, 12:25 UTCJul 20, 15:05 UTC2h 40m
2026-07-17 ERU923 - Jul 17, 13:10 UTCJul 17, 14:39 UTC1h 30m
2026-07-16 ERU923 - Jul 16, 12:44 UTCJul 16, 14:25 UTC1h 40m
2026-07-15 ERU923 - Jul 15, 13:20 UTCJul 15, 14:20 UTC1h 0m
2026-07-15 ERU923 - Jul 15, 10:45 UTCJul 15, 12:10 UTC1h 25m
2026-07-14 ERU923 - Jul 14, 15:50 UTCJul 14, 17:50 UTC2h 0m
2026-07-14 ERU923 - Jul 14, 13:05 UTCJul 14, 14:10 UTC1h 5m
2026-07-13 ERU923 - Jul 13, 12:45 UTCJul 13, 13:50 UTC1h 5m
2026-07-09 ERU923 - Jul 9, 13:10 UTCJul 9, 14:50 UTC1h 40m
2026-07-08 ERU923 - Jul 8, 12:45 UTCJul 8, 13:55 UTC1h 10m
2026-07-02 ERU923 - Jul 2, 14:10 UTCJul 2, 14:40 UTC30m
2026-07-02 ERU923 - Jul 2, 13:15 UTCJul 2, 13:30 UTC15m
2026-07-01 ERU923 - Jul 1, 16:25 UTCJul 1, 17:00 UTC35m
2026-06-30 ERU923 - Jun 30, 13:05 UTCJun 30, 14:20 UTC1h 15m
2026-06-29 ERU923 - Jun 29, 13:00 UTCJun 29, 14:34 UTC1h 35m
2026-06-26 ERU923 - Jun 26, 12:50 UTCJun 26, 13:59 UTC1h 10m
2026-06-25 ERU923 - Jun 25, 15:34 UTCJun 25, 16:55 UTC1h 20m
2026-06-25 ERU923 - Jun 25, 12:25 UTCJun 25, 13:45 UTC1h 20m
2026-06-24 ERU923 - Jun 24, 13:10 UTCJun 24, 14:50 UTC1h 40m
2026-06-23 ERU923 - Jun 23, 14:35 UTCJun 23, 15:04 UTC30m
2026-06-23 ERU923 - Jun 23, 12:05 UTCJun 23, 13:39 UTC1h 35m
2026-06-22 ERU923 - Jun 22, 17:50 UTCJun 22, 19:09 UTC1h 20m
2026-06-22 ERU923 - Jun 22, 14:19 UTCJun 22, 15:29 UTC1h 10m
2026-06-19 ERU923 - Jun 19, 13:09 UTCJun 19, 14:29 UTC1h 20m
2026-06-18 ERU923 - Jun 18, 17:55 UTCJun 18, 18:45 UTC50m
2026-06-17 ERU923 - Jun 17, 15:40 UTCJun 17, 17:00 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 N923ER page for operator, model, and routing details .

Mode-S ACC9C3 frequently asked

What is Mode-S code ACC9C3?
ACC9C3 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N923ER.
Where is Mode-S ACC9C3 registered?
Mode-S code ACC9C3 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 ACC9C3 broadcasting right now?
Yes. Mode-S ACC9C3 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ACC9C3, octal 53144703, decimal 11,323,843.
What flights does ACC9C3 operate?
Mode-S ACC9C3 has broadcast 1 distinct callsign, including ERU923.