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sensors Mode-S transponder

A54C33

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N440SF · AIRBUS HELICOPTERS EC-145 · operated by OSF AVIATION LLC

Hex
A54C33
Octal
51246063
Decimal
10,832,947
Country
US
Tail
N440SF
Type
EC45
No current signal · last broadcast Jul 26, 05:35 UTC
Flights observed
203
Distinct callsigns
1
Country
US
Last broadcast
Jul 26, 05:35 UTC

Last known position

Most recent position reported by Mode-S A54C33.

Country allocation

The ICAO 24-bit address A54C33 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
N440SF - 202 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N440SF - Jul 26, 04:50 UTCJul 26, 05:35 UTC45m
2026-07-25 N440SF - Jul 25, 01:50 UTCJul 25, 03:05 UTC1h 15m
2026-07-24 N440SF - Jul 24, 02:30 UTCJul 24, 02:55 UTC25m
2026-07-24 N440SF - Jul 24, 01:30 UTCJul 24, 01:50 UTC20m
2026-07-23 N440SF - Jul 23, 16:15 UTCJul 23, 17:05 UTC50m
2026-07-23 N440SF - Jul 23, 10:20 UTCJul 23, 11:05 UTC45m
2026-07-23 N440SF - Jul 23, 04:15 UTCJul 23, 04:25 UTC10m
2026-07-22 N440SF - Jul 22, 04:55 UTCJul 22, 05:05 UTC10m
2026-07-21 N440SF - Jul 21, 22:55 UTCJul 21, 23:45 UTC50m
2026-07-20 N440SF - Jul 20, 23:20 UTCJul 20, 23:55 UTC34m
2026-07-20 N440SF - Jul 20, 04:40 UTCJul 20, 05:05 UTC25m
2026-07-20 N440SF - Jul 20, 02:55 UTCJul 20, 03:20 UTC25m
2026-07-20 N440SF - Jul 20, 00:40 UTCJul 20, 01:25 UTC45m
2026-07-20 N440SF - Jul 20, 00:10 UTCJul 20, 00:25 UTC15m
2026-07-19 N440SF - Jul 19, 22:25 UTCJul 19, 23:10 UTC45m
2026-07-19 N440SF - Jul 19, 19:05 UTCJul 19, 19:45 UTC40m
2026-07-19 N440SF - Jul 19, 14:15 UTCJul 19, 14:25 UTC10m
2026-07-19 N440SF - Jul 19, 07:40 UTCJul 19, 08:15 UTC35m
2026-07-19 N440SF - Jul 19, 05:30 UTCJul 19, 06:40 UTC1h 10m
2026-07-18 N440SF - Jul 18, 23:20 UTCJul 18, 23:50 UTC30m
2026-07-18 N440SF - Jul 18, 14:20 UTCJul 18, 14:40 UTC20m
2026-07-15 N440SF - Jul 15, 21:05 UTCJul 15, 21:15 UTC10m
2026-07-14 N440SF - Jul 14, 23:25 UTCJul 14, 23:35 UTC10m
2026-07-14 N440SF - Jul 14, 13:15 UTCJul 14, 14:15 UTC1h 0m
2026-07-14 N440SF - Jul 14, 05:25 UTCJul 14, 06:10 UTC45m
2026-07-13 N440SF - Jul 13, 22:05 UTCJul 13, 22:15 UTC10m
2026-07-13 N440SF - Jul 13, 19:00 UTCJul 13, 19:35 UTC35m
2026-07-13 N440SF - Jul 13, 03:55 UTCJul 13, 04:45 UTC50m
2026-07-13 N440SF - Jul 13, 01:15 UTCJul 13, 01:55 UTC40m
2026-07-13 N440SF - Jul 13, 00:20 UTCJul 13, 00:30 UTC10m
2026-07-12 N440SF - Jul 12, 13:45 UTCJul 12, 13:55 UTC10m
2026-07-10 N440SF - Jul 10, 05:55 UTCJul 10, 06:35 UTC40m
2026-07-09 N440SF - Jul 9, 15:30 UTCJul 9, 15:40 UTC10m
2026-07-09 N440SF - Jul 9, 07:55 UTCJul 9, 08:35 UTC40m
2026-07-08 N440SF - Jul 8, 17:30 UTCJul 8, 17:40 UTC10m
2026-07-08 N440SF - Jul 8, 08:05 UTCJul 8, 09:20 UTC1h 15m
2026-07-07 N440SF - Jul 7, 21:25 UTCJul 7, 22:05 UTC40m
2026-07-07 N440SF - Jul 7, 05:35 UTCJul 7, 06:10 UTC35m
2026-07-07 N440SF - Jul 7, 03:50 UTCJul 7, 04:35 UTC45m
2026-07-06 N440SF - Jul 6, 14:10 UTCJul 6, 14:25 UTC15m
2026-07-05 N440SF - Jul 5, 21:00 UTCJul 5, 21:25 UTC25m
2026-07-05 N440SF - Jul 5, 07:20 UTCJul 5, 07:45 UTC25m
2026-07-05 N440SF - Jul 5, 04:00 UTCJul 5, 05:15 UTC1h 15m
2026-07-03 N440SF - Jul 3, 20:35 UTCJul 3, 20:45 UTC10m
2026-07-01 N440SF - Jul 1, 22:15 UTCJul 1, 22:25 UTC10m
2026-07-01 N440SF - Jul 1, 00:30 UTCJul 1, 00:45 UTC15m
2026-06-25 N440SF - Jun 25, 15:04 UTCJun 25, 15:15 UTC10m
2026-06-24 N440SF - Jun 24, 23:04 UTCJun 24, 23:40 UTC35m
2026-06-24 N440SF - Jun 24, 02:05 UTCJun 24, 02:15 UTC10m
2026-06-23 N440SF - Jun 23, 23:14 UTCJun 23, 23:24 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 N440SF page for operator, model, and routing details .

Mode-S A54C33 frequently asked

What is Mode-S code A54C33?
A54C33 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N440SF.
Where is Mode-S A54C33 registered?
Mode-S code A54C33 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 A54C33 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 05:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A54C33, octal 51246063, decimal 10,832,947.
What flights does A54C33 operate?
Mode-S A54C33 has broadcast 1 distinct callsign, including N440SF.