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sensors Mode-S transponder

AC508C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N893AU · AIRBUS HELICOPTERS EC-145 · operated by METRO AVIATION INC

Hex
AC508C
Octal
53050214
Decimal
11,292,812
Country
US
Tail
N893AU
Type
EC45
Broadcasting now · callsign N893AU · 1,375 ft
Flights observed
21
Distinct callsigns
1
Country
US
Last broadcast
4h ago

Current position

AC508C is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AC508C 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
N893AU - 21 2026-04-18

Recent flights last 21

DateFlightRouteTakeoffLandingDuration
2026-04-18 N893AU - Apr 18, 16:05 UTCApr 18, 16:25 UTC20m
2026-04-18 N893AU - Apr 18, 13:25 UTCApr 18, 13:40 UTC15m
2026-04-17 N893AU - Apr 17, 19:00 UTCApr 17, 19:20 UTC20m
2026-04-17 N893AU - Apr 17, 18:10 UTCApr 17, 18:25 UTC15m
2026-04-16 N893AU - Apr 16, 23:30 UTCApr 17, 00:20 UTC50m
2026-04-16 N893AU - Apr 16, 22:54 UTCApr 16, 23:05 UTC10m
2026-04-16 N893AU - Apr 16, 21:14 UTCApr 16, 21:34 UTC20m
2026-04-16 N893AU - Apr 16, 06:05 UTCApr 16, 07:05 UTC1h 0m
2026-04-16 N893AU - Apr 16, 05:09 UTCApr 16, 05:20 UTC10m
2026-04-16 N893AU - Apr 16, 04:04 UTCApr 16, 05:05 UTC1h 0m
2026-04-15 N893AU - Apr 15, 19:10 UTCApr 15, 19:30 UTC20m
2026-04-15 N893AU - Apr 15, 17:05 UTCApr 15, 17:20 UTC15m
2026-04-15 N893AU - Apr 15, 00:55 UTCApr 15, 01:20 UTC25m
2026-04-14 N893AU - Apr 14, 19:10 UTCApr 14, 20:00 UTC50m
2026-04-14 N893AU - Apr 14, 16:50 UTCApr 14, 17:25 UTC35m
2026-04-14 N893AU - Apr 14, 15:50 UTCApr 14, 16:10 UTC20m
2026-04-14 N893AU - Apr 14, 14:50 UTCApr 14, 15:10 UTC20m
2026-04-14 N893AU - Apr 14, 14:05 UTCApr 14, 14:25 UTC20m
2026-04-14 N893AU - Apr 14, 13:00 UTCApr 14, 13:15 UTC15m
2026-04-13 N893AU - Apr 13, 01:30 UTCApr 13, 01:50 UTC20m
2026-04-13 N893AU - Apr 13, 00:15 UTCApr 13, 00:25 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 N893AU page for operator, model, and routing details .

Mode-S AC508C frequently asked

What is Mode-S code AC508C?
AC508C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N893AU.
Where is Mode-S AC508C registered?
Mode-S code AC508C 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 AC508C broadcasting right now?
Yes. Mode-S AC508C is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC508C, octal 53050214, decimal 11,292,812.
What flights does AC508C operate?
Mode-S AC508C has broadcast 1 distinct callsign, including N893AU.