Apparatus

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sensors Mode-S transponder

AC492C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N891BH · BELL 505 JetRanger X · operated by ALFF GREEN LLC

Hex
AC492C
Octal
53044454
Decimal
11,290,924
Country
US
Tail
N891BH
Type
B505
No current signal · last broadcast 18d ago
Flights observed
22
Distinct callsigns
1
Country
US
Last broadcast
18d ago

Last known position

Most recent position reported by Mode-S AC492C.

Country allocation

The ICAO 24-bit address AC492C 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
N891BH - 22 2026-07-25

Recent flights last 22

DateFlightRouteTakeoffLandingDuration
2026-07-25 N891BH - Jul 25, 21:35 UTCJul 25, 23:25 UTC1h 50m
2026-07-25 N891BH - Jul 25, 18:40 UTCJul 25, 20:50 UTC2h 10m
2026-07-24 N891BH - Jul 24, 22:55 UTCJul 25, 00:25 UTC1h 30m
2026-07-24 N891BH - Jul 24, 20:30 UTCJul 24, 21:15 UTC45m
2026-07-24 N891BH - Jul 24, 19:00 UTCJul 24, 19:35 UTC35m
2026-07-24 N891BH - Jul 24, 17:35 UTCJul 24, 18:00 UTC25m
2026-07-23 N891BH - Jul 23, 20:30 UTCJul 23, 21:15 UTC45m
2026-07-23 N891BH - Jul 23, 17:55 UTCJul 23, 19:50 UTC1h 55m
2026-07-22 N891BH - Jul 22, 00:45 UTCJul 22, 01:00 UTC15m
2026-07-22 N891BH - Jul 22, 00:00 UTCJul 22, 00:15 UTC15m
2026-07-21 N891BH - Jul 21, 18:10 UTCJul 21, 18:35 UTC25m
2026-07-20 N891BH - Jul 20, 23:45 UTCJul 21, 00:05 UTC20m
2026-07-20 N891BH - Jul 20, 17:45 UTCJul 20, 18:15 UTC30m
2026-07-19 N891BH - Jul 19, 23:00 UTCJul 19, 23:20 UTC20m
2026-07-19 N891BH - Jul 19, 21:30 UTCJul 19, 21:50 UTC20m
2026-07-19 N891BH - Jul 19, 19:20 UTCJul 19, 20:10 UTC50m
2026-07-19 N891BH - Jul 19, 00:25 UTCJul 19, 01:05 UTC40m
2026-07-18 N891BH - Jul 18, 18:20 UTCJul 18, 19:10 UTC50m
2026-07-18 N891BH - Jul 18, 00:00 UTCJul 18, 00:35 UTC35m
2026-07-15 N891BH - Jul 15, 21:55 UTCJul 15, 22:05 UTC10m
2026-04-24 N891BH - Apr 24, 17:30 UTCApr 24, 18:15 UTC45m
2026-04-24 N891BH - Apr 24, 13:45 UTCApr 24, 14:05 UTC20m

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 N891BH page for operator, model, and routing details .

Mode-S AC492C frequently asked

What is Mode-S code AC492C?
AC492C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N891BH.
Where is Mode-S AC492C registered?
Mode-S code AC492C 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 AC492C broadcasting right now?
No active broadcast right now. Last signal was 18d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC492C, octal 53044454, decimal 11,290,924.
What flights does AC492C operate?
Mode-S AC492C has broadcast 1 distinct callsign, including N891BH.