Apparatus

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sensors Mode-S transponder

AC2D25

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N884ER · CESSNA 172 Skyhawk · operated by EMBRY-RIDDLE AERONAUTICAL UNIVERSITY INC

Hex
AC2D25
Octal
53026445
Decimal
11,283,749
Country
US
Tail
N884ER
Type
C172
No current signal · last broadcast Jul 25, 20:00 UTC
Flights observed
191
Distinct callsigns
1
Country
US
Last broadcast
Jul 25, 20:00 UTC

Last known position

Most recent position reported by Mode-S AC2D25.

Country allocation

The ICAO 24-bit address AC2D25 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
ERU884 - 191 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 ERU884 - Jul 25, 19:00 UTCJul 25, 20:00 UTC1h 0m
2026-07-25 ERU884 - Jul 25, 18:00 UTCJul 25, 18:20 UTC20m
2026-07-25 ERU884 - Jul 25, 16:25 UTCJul 25, 16:55 UTC30m
2026-07-24 ERU884 - Jul 24, 15:25 UTCJul 24, 17:20 UTC1h 55m
2026-07-24 ERU884 - Jul 24, 12:55 UTCJul 24, 13:20 UTC25m
2026-07-24 ERU884 - Jul 24, 11:50 UTCJul 24, 12:20 UTC30m
2026-07-23 ERU884 - Jul 23, 13:15 UTCJul 23, 14:40 UTC1h 25m
2026-07-23 ERU884 DAB → DAB Jul 23, 11:40 UTCJul 23, 12:05 UTC25m
2026-07-22 ERU884 - Jul 22, 12:50 UTCJul 22, 14:20 UTC1h 30m
2026-07-21 ERU884 - Jul 21, 13:40 UTCJul 21, 14:15 UTC35m
2026-07-20 ERU884 - Jul 20, 16:05 UTCJul 20, 16:20 UTC15m
2026-07-20 ERU884 - Jul 20, 13:05 UTCJul 20, 14:05 UTC1h 0m
2026-07-17 ERU884 - Jul 17, 12:50 UTCJul 17, 14:30 UTC1h 40m
2026-07-15 ERU884 - Jul 15, 01:20 UTCJul 15, 01:50 UTC30m
2026-07-14 ERU884 - Jul 14, 15:40 UTCJul 14, 16:15 UTC35m
2026-07-14 ERU884 - Jul 14, 12:50 UTCJul 14, 13:40 UTC50m
2026-07-14 ERU884 - Jul 14, 10:05 UTCJul 14, 11:40 UTC1h 35m
2026-07-14 ERU884 DAB → DAB Jul 14, 01:00 UTCJul 14, 02:05 UTC1h 5m
2026-07-13 ERU884 - Jul 13, 16:00 UTCJul 13, 17:00 UTC1h 0m
2026-07-13 ERU884 - Jul 13, 13:45 UTCJul 13, 14:20 UTC35m
2026-07-13 ERU884 - Jul 13, 13:05 UTCJul 13, 13:15 UTC10m
2026-07-13 ERU884 - Jul 13, 10:15 UTCJul 13, 11:25 UTC1h 10m
2026-07-13 ERU884 - Jul 13, 00:20 UTCJul 13, 00:35 UTC15m
2026-07-12 ERU884 - Jul 12, 13:05 UTCJul 12, 15:05 UTC2h 0m
2026-07-11 ERU884 - Jul 11, 22:55 UTCJul 12, 00:15 UTC1h 20m
2026-07-11 ERU884 - Jul 11, 20:25 UTCJul 11, 20:35 UTC10m
2026-07-11 ERU884 - Jul 11, 12:30 UTCJul 11, 13:40 UTC1h 10m
2026-07-11 ERU884 - Jul 11, 02:10 UTCJul 11, 04:10 UTC2h 0m
2026-07-10 ERU884 - Jul 10, 22:00 UTCJul 10, 22:50 UTC50m
2026-07-10 ERU884 - Jul 10, 18:35 UTCJul 10, 19:15 UTC40m
2026-07-10 ERU884 - Jul 10, 16:25 UTCJul 10, 17:40 UTC1h 15m
2026-07-10 ERU884 - Jul 10, 12:35 UTCJul 10, 15:30 UTC2h 55m
2026-07-10 ERU884 - Jul 10, 03:20 UTCJul 10, 03:40 UTC20m
2026-07-09 ERU884 - Jul 9, 21:45 UTCJul 9, 22:20 UTC35m
2026-07-09 ERU884 - Jul 9, 20:35 UTCJul 9, 20:50 UTC15m
2026-07-09 ERU884 - Jul 9, 17:45 UTCJul 9, 18:25 UTC40m
2026-07-09 ERU884 - Jul 9, 14:45 UTCJul 9, 15:25 UTC40m
2026-07-09 ERU884 - Jul 9, 13:10 UTCJul 9, 14:00 UTC50m
2026-07-08 ERU884 - Jul 8, 13:40 UTCJul 8, 14:40 UTC1h 0m
2026-07-07 ERU884 - Jul 7, 13:15 UTCJul 7, 14:35 UTC1h 20m
2026-07-07 ERU884 - Jul 7, 10:20 UTCJul 7, 11:50 UTC1h 30m
2026-07-06 ERU884 - Jul 6, 17:50 UTCJul 6, 18:10 UTC20m
2026-07-06 ERU884 - Jul 6, 15:10 UTCJul 6, 16:30 UTC1h 20m
2026-07-06 ERU884 - Jul 6, 10:25 UTCJul 6, 12:40 UTC2h 15m
2026-07-04 ERU884 - Jul 4, 13:20 UTCJul 4, 14:40 UTC1h 20m
2026-07-04 ERU884 - Jul 4, 10:20 UTCJul 4, 12:40 UTC2h 20m
2026-07-04 ERU884 - Jul 4, 01:45 UTCJul 4, 03:25 UTC1h 40m
2026-07-03 ERU884 - Jul 3, 21:40 UTCJul 3, 23:55 UTC2h 15m
2026-07-03 ERU884 - Jul 3, 17:40 UTCJul 3, 18:45 UTC1h 5m
2026-07-03 ERU884 - Jul 3, 02:00 UTCJul 3, 02:55 UTC55m

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 N884ER page for operator, model, and routing details .

Mode-S AC2D25 frequently asked

What is Mode-S code AC2D25?
AC2D25 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N884ER.
Where is Mode-S AC2D25 registered?
Mode-S code AC2D25 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 AC2D25 broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 20:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC2D25, octal 53026445, decimal 11,283,749.
What flights does AC2D25 operate?
Mode-S AC2D25 has broadcast 1 distinct callsign, including ERU884.