Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

ACAA56

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N915ME · AIRBUS HELICOPTERS EC-135/635 · operated by CENTER FOR EMERGENCY MEDICINE OF WESTERN PA

Hex
ACAA56
Octal
53125126
Decimal
11,315,798
Country
US
Tail
N915ME
Type
EC35
No current signal · last broadcast 24d ago
Flights observed
164
Distinct callsigns
1
Country
US
Last broadcast
24d ago

Last known position

Most recent position reported by Mode-S ACAA56.

Country allocation

The ICAO 24-bit address ACAA56 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
N915ME - 164 2026-06-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-23 N915ME AGC → AGC Jun 23, 13:15 UTCJun 23, 13:29 UTC15m
2026-06-22 N915ME - Jun 22, 11:09 UTCJun 22, 11:19 UTC10m
2026-06-22 N915ME - Jun 22, 05:40 UTCJun 22, 05:49 UTC10m
2026-06-21 N915ME WSG → AGC Jun 21, 23:05 UTCJun 21, 23:34 UTC30m
2026-06-21 N915ME - Jun 21, 21:05 UTCJun 21, 21:14 UTC10m
2026-06-21 N915ME - Jun 21, 19:50 UTCJun 21, 20:59 UTC1h 10m
2026-06-21 N915ME - Jun 21, 14:44 UTCJun 21, 15:05 UTC20m
2026-06-21 N915ME - Jun 21, 13:44 UTCJun 21, 13:54 UTC10m
2026-06-21 N915ME - Jun 21, 12:55 UTCJun 21, 13:04 UTC10m
2026-06-21 N915ME - Jun 21, 06:40 UTCJun 21, 07:00 UTC20m
2026-06-21 N915ME - Jun 21, 05:20 UTCJun 21, 05:35 UTC15m
2026-06-21 N915ME - Jun 21, 03:19 UTCJun 21, 03:44 UTC25m
2026-06-21 N915ME - Jun 21, 02:15 UTCJun 21, 02:35 UTC20m
2026-06-20 N915ME - Jun 20, 11:25 UTCJun 20, 11:40 UTC15m
2026-06-20 N915ME - Jun 20, 10:39 UTCJun 20, 11:14 UTC35m
2026-06-20 N915ME - Jun 20, 02:04 UTCJun 20, 02:19 UTC15m
2026-06-20 N915ME - Jun 20, 00:49 UTCJun 20, 01:24 UTC35m
2026-06-19 N915ME - Jun 19, 23:14 UTCJun 19, 23:49 UTC35m
2026-06-18 N915ME - Jun 18, 11:50 UTCJun 18, 12:35 UTC45m
2026-06-18 N915ME - Jun 18, 11:35 UTCJun 18, 11:45 UTC10m
2026-06-18 N915ME - Jun 18, 04:20 UTCJun 18, 04:40 UTC20m
2026-06-18 N915ME - Jun 18, 03:35 UTCJun 18, 04:10 UTC35m
2026-06-17 N915ME - Jun 17, 22:55 UTCJun 17, 23:10 UTC15m
2026-06-17 N915ME - Jun 17, 20:40 UTCJun 17, 22:10 UTC1h 30m
2026-06-17 N915ME - Jun 17, 19:05 UTCJun 17, 19:50 UTC45m
2026-06-17 N915ME - Jun 17, 11:30 UTCJun 17, 12:40 UTC1h 10m
2026-06-17 N915ME - Jun 17, 00:30 UTCJun 17, 01:35 UTC1h 5m
2026-06-16 N915ME - Jun 16, 23:40 UTCJun 16, 23:55 UTC15m
2026-06-16 N915ME - Jun 16, 14:05 UTCJun 16, 14:15 UTC10m
2026-06-16 N915ME - Jun 16, 11:00 UTCJun 16, 11:15 UTC15m
2026-06-16 N915ME - Jun 16, 08:44 UTCJun 16, 09:25 UTC40m
2026-06-16 N915ME - Jun 16, 08:15 UTCJun 16, 08:25 UTC10m
2026-06-16 N915ME - Jun 16, 07:15 UTCJun 16, 07:40 UTC25m
2026-06-16 N915ME - Jun 16, 02:45 UTCJun 16, 02:54 UTC10m
2026-06-16 N915ME - Jun 16, 01:55 UTCJun 16, 02:40 UTC45m
2026-06-16 N915ME - Jun 16, 01:19 UTCJun 16, 01:35 UTC15m
2026-06-15 N915ME - Jun 15, 23:04 UTCJun 15, 23:39 UTC35m
2026-06-15 N915ME - Jun 15, 20:59 UTCJun 15, 21:14 UTC15m
2026-06-15 N915ME - Jun 15, 20:30 UTCJun 15, 20:54 UTC25m
2026-06-15 N915ME - Jun 15, 20:15 UTCJun 15, 20:25 UTC10m
2026-06-15 N915ME - Jun 15, 18:15 UTCJun 15, 18:25 UTC10m
2026-06-09 N915ME - Jun 9, 18:35 UTCJun 9, 19:00 UTC25m
2026-06-08 N915ME - Jun 8, 16:15 UTCJun 8, 16:45 UTC30m
2026-06-06 N915ME - Jun 6, 14:25 UTCJun 6, 14:45 UTC20m
2026-06-06 N915ME - Jun 6, 08:55 UTCJun 6, 09:50 UTC55m
2026-06-06 N915ME - Jun 6, 08:05 UTCJun 6, 08:50 UTC45m
2026-06-06 N915ME - Jun 6, 02:10 UTCJun 6, 02:35 UTC25m
2026-06-06 N915ME - Jun 6, 00:05 UTCJun 6, 00:25 UTC20m
2026-06-05 N915ME - Jun 5, 20:30 UTCJun 5, 22:55 UTC2h 25m
2026-06-05 N915ME - Jun 5, 19:35 UTCJun 5, 19:50 UTC15m

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 N915ME page for operator, model, and routing details .

Mode-S ACAA56 frequently asked

What is Mode-S code ACAA56?
ACAA56 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N915ME.
Where is Mode-S ACAA56 registered?
Mode-S code ACAA56 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 ACAA56 broadcasting right now?
No active broadcast right now. Last signal was 24d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ACAA56, octal 53125126, decimal 11,315,798.
What flights does ACAA56 operate?
Mode-S ACAA56 has broadcast 1 distinct callsign, including N915ME.