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sensors Mode-S transponder

AC055E

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N874BU · AIRBUS HELICOPTERS EC-145 · operated by METRO AVIATION INC

Hex
AC055E
Octal
53002536
Decimal
11,273,566
Country
US
Tail
N874BU
Type
EC45
No current signal · last broadcast Jul 20, 15:35 UTC
Flights observed
204
Distinct callsigns
1
Country
US
Last broadcast
Jul 20, 15:35 UTC

Last known position

Most recent position reported by Mode-S AC055E.

Country allocation

The ICAO 24-bit address AC055E 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
N874BU - 204 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-20 N874BU - Jul 20, 14:50 UTCJul 20, 15:35 UTC45m
2026-07-20 N874BU - Jul 20, 12:30 UTCJul 20, 12:55 UTC25m
2026-07-15 N874BU - Jul 15, 20:10 UTCJul 15, 20:40 UTC30m
2026-06-24 N874BU - Jun 24, 15:24 UTCJun 24, 15:44 UTC20m
2026-06-24 N874BU - Jun 24, 01:55 UTCJun 24, 02:30 UTC35m
2026-06-24 N874BU - Jun 24, 00:34 UTCJun 24, 01:14 UTC40m
2026-06-23 N874BU - Jun 23, 21:54 UTCJun 23, 22:05 UTC10m
2026-06-21 N874BU - Jun 21, 20:24 UTCJun 21, 20:45 UTC20m
2026-06-21 N874BU - Jun 21, 19:20 UTCJun 21, 19:39 UTC20m
2026-06-21 N874BU - Jun 21, 01:49 UTCJun 21, 02:15 UTC25m
2026-06-21 N874BU - Jun 21, 00:29 UTCJun 21, 01:14 UTC45m
2026-06-20 N874BU - Jun 20, 23:10 UTCJun 20, 23:19 UTC10m
2026-06-20 N874BU - Jun 20, 21:05 UTCJun 20, 22:25 UTC1h 20m
2026-06-20 N874BU - Jun 20, 19:49 UTCJun 20, 20:29 UTC40m
2026-06-20 N874BU - Jun 20, 01:50 UTCJun 20, 02:00 UTC10m
2026-06-20 N874BU - Jun 20, 00:24 UTCJun 20, 01:39 UTC1h 15m
2026-06-19 N874BU - Jun 19, 19:25 UTCJun 19, 19:45 UTC20m
2026-06-19 N874BU - Jun 19, 17:44 UTCJun 19, 17:59 UTC15m
2026-06-19 N874BU - Jun 19, 16:34 UTCJun 19, 16:55 UTC20m
2026-06-19 N874BU - Jun 19, 15:34 UTCJun 19, 15:49 UTC15m
2026-06-17 N874BU - Jun 17, 19:05 UTCJun 17, 19:25 UTC20m
2026-06-17 N874BU - Jun 17, 12:20 UTCJun 17, 12:30 UTC10m
2026-06-16 N874BU HAO → HAO Jun 16, 15:24 UTCJun 16, 17:55 UTC2h 30m
2026-06-16 N874BU - Jun 16, 05:30 UTCJun 16, 06:15 UTC45m
2026-06-16 N874BU - Jun 16, 04:35 UTCJun 16, 04:50 UTC15m
2026-06-15 N874BU HAO → HAO Jun 15, 15:35 UTCJun 15, 16:40 UTC1h 5m
2026-06-14 N874BU - Jun 14, 23:59 UTCJun 15, 01:10 UTC1h 10m
2026-06-14 N874BU - Jun 14, 05:55 UTCJun 14, 07:05 UTC1h 10m
2026-06-14 N874BU - Jun 14, 02:05 UTCJun 14, 02:25 UTC20m
2026-06-14 N874BU - Jun 14, 00:25 UTCJun 14, 01:35 UTC1h 10m
2026-06-13 N874BU - Jun 13, 20:20 UTCJun 13, 21:55 UTC1h 35m
2026-06-13 N874BU - Jun 13, 17:45 UTCJun 13, 17:55 UTC10m
2026-06-13 N874BU - Jun 13, 16:50 UTCJun 13, 17:05 UTC15m
2026-06-13 N874BU - Jun 13, 16:05 UTCJun 13, 16:15 UTC10m
2026-06-12 N874BU - Jun 12, 18:30 UTCJun 12, 18:40 UTC10m
2026-06-11 N874BU - Jun 11, 02:40 UTCJun 11, 04:45 UTC2h 5m
2026-06-10 N874BU - Jun 10, 23:20 UTCJun 10, 23:30 UTC10m
2026-06-10 N874BU - Jun 10, 21:55 UTCJun 10, 22:25 UTC30m
2026-06-10 N874BU - Jun 10, 01:30 UTCJun 10, 01:40 UTC10m
2026-06-10 N874BU - Jun 10, 00:15 UTCJun 10, 00:55 UTC40m
2026-06-08 N874BU - Jun 8, 16:25 UTCJun 8, 16:35 UTC10m
2026-06-08 N874BU - Jun 8, 14:45 UTCJun 8, 14:55 UTC10m
2026-06-07 N874BU - Jun 7, 14:00 UTCJun 7, 14:20 UTC20m
2026-06-07 N874BU - Jun 7, 13:00 UTCJun 7, 13:20 UTC20m
2026-06-07 N874BU - Jun 7, 11:40 UTCJun 7, 11:55 UTC15m
2026-06-07 N874BU - Jun 7, 05:15 UTCJun 7, 06:45 UTC1h 30m
2026-06-06 N874BU - Jun 6, 17:54 UTCJun 6, 18:04 UTC10m
2026-06-06 N874BU - Jun 6, 16:24 UTCJun 6, 17:15 UTC50m
2026-06-06 N874BU - Jun 6, 05:15 UTCJun 6, 05:25 UTC10m
2026-06-06 N874BU - Jun 6, 04:10 UTCJun 6, 04:20 UTC10m

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 N874BU page for operator, model, and routing details .

Mode-S AC055E frequently asked

What is Mode-S code AC055E?
AC055E is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N874BU.
Where is Mode-S AC055E registered?
Mode-S code AC055E 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 AC055E broadcasting right now?
No active broadcast right now. Last signal was Jul 20, 15:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC055E, octal 53002536, decimal 11,273,566.
What flights does AC055E operate?
Mode-S AC055E has broadcast 1 distinct callsign, including N874BU.