Apparatus

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sensors Mode-S transponder

AD4EB3

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N957AL · AIRBUS HELICOPTERS EC-135/635 · operated by AIR METHODS LLC

Hex
AD4EB3
Octal
53247263
Decimal
11,357,875
Country
US
Tail
N957AL
Type
EC35
No current signal · last broadcast 13d ago
Flights observed
205
Distinct callsigns
1
Country
US
Last broadcast
13d ago

Last known position

Most recent position reported by Mode-S AD4EB3.

Country allocation

The ICAO 24-bit address AD4EB3 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
ALFT - 205 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ALFT - Jul 26, 04:55 UTCJul 26, 05:10 UTC15m
2026-07-26 ALFT - Jul 26, 04:05 UTCJul 26, 04:20 UTC15m
2026-07-25 ALFT - Jul 25, 23:10 UTCJul 25, 23:35 UTC25m
2026-07-25 ALFT - Jul 25, 19:10 UTCJul 25, 19:50 UTC40m
2026-07-25 ALFT - Jul 25, 07:35 UTCJul 25, 07:50 UTC15m
2026-07-25 ALFT - Jul 25, 06:35 UTCJul 25, 06:55 UTC20m
2026-07-24 ALFT - Jul 24, 17:35 UTCJul 24, 18:15 UTC40m
2026-07-24 ALFT - Jul 24, 16:20 UTCJul 24, 17:05 UTC45m
2026-07-24 ALFT - Jul 24, 03:20 UTCJul 24, 03:30 UTC10m
2026-07-23 ALFT - Jul 23, 20:50 UTCJul 23, 22:35 UTC1h 45m
2026-07-23 ALFT - Jul 23, 02:40 UTCJul 23, 02:55 UTC15m
2026-07-23 ALFT - Jul 23, 01:50 UTCJul 23, 02:10 UTC20m
2026-07-22 ALFT - Jul 22, 00:20 UTCJul 22, 01:45 UTC1h 25m
2026-07-20 ALFT - Jul 20, 06:55 UTCJul 20, 07:05 UTC10m
2026-07-20 ALFT - Jul 20, 05:45 UTCJul 20, 06:20 UTC35m
2026-07-20 ALFT - Jul 20, 04:00 UTCJul 20, 05:05 UTC1h 5m
2026-07-19 ALFT - Jul 19, 19:20 UTCJul 19, 19:30 UTC10m
2026-07-19 ALFT - Jul 19, 01:20 UTCJul 19, 02:10 UTC50m
2026-07-19 ALFT - Jul 19, 00:20 UTCJul 19, 00:50 UTC30m
2026-07-18 ALFT - Jul 18, 22:20 UTCJul 18, 22:30 UTC10m
2026-07-17 ALFT - Jul 17, 23:45 UTCJul 18, 00:00 UTC15m
2026-07-17 ALFT - Jul 17, 21:55 UTCJul 17, 22:25 UTC30m
2026-07-17 ALFT - Jul 17, 20:20 UTCJul 17, 20:40 UTC20m
2026-07-17 ALFT - Jul 17, 09:20 UTCJul 17, 09:40 UTC20m
2026-07-17 ALFT - Jul 17, 08:15 UTCJul 17, 08:49 UTC35m
2026-07-17 ALFT - Jul 17, 05:55 UTCJul 17, 06:25 UTC30m
2026-07-15 ALFT - Jul 15, 22:15 UTCJul 15, 23:05 UTC50m
2026-07-15 ALFT - Jul 15, 21:05 UTCJul 15, 21:35 UTC30m
2026-07-15 ALFT - Jul 15, 19:55 UTCJul 15, 20:30 UTC35m
2026-07-15 ALFT - Jul 15, 04:55 UTCJul 15, 05:20 UTC25m
2026-07-13 ALFT - Jul 13, 01:30 UTCJul 13, 02:30 UTC1h 0m
2026-07-11 ALFT - Jul 11, 20:15 UTCJul 11, 21:10 UTC55m
2026-07-11 ALFT - Jul 11, 19:35 UTCJul 11, 19:55 UTC20m
2026-07-11 ALFT - Jul 11, 06:55 UTCJul 11, 08:01 UTC1h 5m
2026-07-11 ALFT - Jul 11, 04:01 UTCJul 11, 05:20 UTC1h 20m
2026-07-11 ALFT - Jul 11, 02:50 UTCJul 11, 03:05 UTC15m
2026-07-10 ALFT - Jul 10, 18:10 UTCJul 10, 19:35 UTC1h 25m
2026-07-10 ALFT - Jul 10, 17:25 UTCJul 10, 17:35 UTC10m
2026-07-10 ALFT - Jul 10, 05:55 UTCJul 10, 06:30 UTC35m
2026-07-10 ALFT - Jul 10, 00:15 UTCJul 10, 01:45 UTC1h 30m
2026-07-09 ALFT - Jul 9, 00:00 UTCJul 9, 00:35 UTC35m
2026-07-05 ALFT - Jul 5, 00:45 UTCJul 5, 01:30 UTC45m
2026-07-04 ALFT - Jul 4, 23:20 UTCJul 5, 00:10 UTC50m
2026-07-04 ALFT - Jul 4, 21:25 UTCJul 4, 22:10 UTC45m
2026-07-04 ALFT - Jul 4, 20:25 UTCJul 4, 20:55 UTC30m
2026-07-04 ALFT - Jul 4, 19:05 UTCJul 4, 19:20 UTC15m
2026-07-04 ALFT - Jul 4, 12:20 UTCJul 4, 13:00 UTC40m
2026-07-04 ALFT - Jul 4, 11:20 UTCJul 4, 11:50 UTC30m
2026-07-04 ALFT - Jul 4, 09:25 UTCJul 4, 09:35 UTC10m
2026-07-03 ALFT - Jul 3, 10:10 UTCJul 3, 10:45 UTC35m

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 N957AL page for operator, model, and routing details .

Mode-S AD4EB3 frequently asked

What is Mode-S code AD4EB3?
AD4EB3 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N957AL.
Where is Mode-S AD4EB3 registered?
Mode-S code AD4EB3 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 AD4EB3 broadcasting right now?
No active broadcast right now. Last signal was 13d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AD4EB3, octal 53247263, decimal 11,357,875.
What flights does AD4EB3 operate?
Mode-S AD4EB3 has broadcast 1 distinct callsign, including ALFT.