Apparatus

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sensors Mode-S transponder

ACF4F5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N934EM · AEROSPATIALE AS-350 Ecureuil · operated by REACH AIR MEDICAL SERVICES LLC

Hex
ACF4F5
Octal
53172365
Decimal
11,334,901
Country
US
Tail
N934EM
Type
AS50
No current signal · last broadcast Jul 26, 20:40 UTC
Flights observed
229
Distinct callsigns
1
Country
US
Last broadcast
Jul 26, 20:40 UTC

Last known position

Most recent position reported by Mode-S ACF4F5.

Country allocation

The ICAO 24-bit address ACF4F5 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
LIFELN3 - 228 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 LIFELN3 - Jul 26, 19:55 UTCJul 26, 20:40 UTC45m
2026-07-26 LIFELN3 - Jul 26, 11:25 UTCJul 26, 11:50 UTC25m
2026-07-26 LIFELN3 - Jul 26, 10:25 UTCJul 26, 10:50 UTC25m
2026-07-26 LIFELN3 - Jul 26, 09:00 UTCJul 26, 09:25 UTC25m
2026-07-26 LIFELN3 - Jul 26, 07:45 UTCJul 26, 08:10 UTC25m
2026-07-25 LIFELN3 - Jul 25, 22:50 UTCJul 25, 23:15 UTC25m
2026-07-25 LIFELN3 - Jul 25, 21:25 UTCJul 25, 21:50 UTC25m
2026-07-25 LIFELN3 - Jul 25, 20:15 UTCJul 25, 20:30 UTC15m
2026-07-25 LIFELN3 - Jul 25, 06:55 UTCJul 25, 07:15 UTC20m
2026-07-25 LIFELN3 - Jul 25, 06:40 UTCJul 25, 06:45 UTC5m
2026-07-25 LIFELN3 - Jul 25, 05:40 UTCJul 25, 05:55 UTC15m
2026-07-25 LIFELN3 - Jul 25, 03:55 UTCJul 25, 04:20 UTC25m
2026-07-24 LIFELN3 - Jul 24, 22:35 UTCJul 24, 23:00 UTC25m
2026-07-24 LIFELN3 - Jul 24, 21:00 UTCJul 24, 21:45 UTC45m
2026-07-24 LIFELN3 - Jul 24, 07:00 UTCJul 24, 07:20 UTC20m
2026-07-24 LIFELN3 - Jul 24, 05:40 UTCJul 24, 06:25 UTC45m
2026-07-23 LIFELN3 - Jul 23, 20:50 UTCJul 23, 21:35 UTC45m
2026-07-23 LIFELN3 - Jul 23, 19:40 UTCJul 23, 20:20 UTC40m
2026-07-23 LIFELN3 - Jul 23, 17:20 UTCJul 23, 17:40 UTC20m
2026-07-23 LIFELN3 - Jul 23, 15:55 UTCJul 23, 16:50 UTC55m
2026-07-21 LIFELN3 - Jul 21, 21:55 UTCJul 21, 22:20 UTC25m
2026-07-21 LIFELN3 - Jul 21, 20:20 UTCJul 21, 20:40 UTC20m
2026-07-21 LIFELN3 - Jul 21, 02:15 UTCJul 21, 03:00 UTC45m
2026-07-21 LIFELN3 - Jul 21, 01:30 UTCJul 21, 01:50 UTC20m
2026-07-21 LIFELN3 - Jul 21, 00:30 UTCJul 21, 00:55 UTC25m
2026-07-20 LIFELN3 - Jul 20, 18:15 UTCJul 20, 19:00 UTC45m
2026-07-20 LIFELN3 - Jul 20, 17:15 UTCJul 20, 17:35 UTC20m
2026-07-20 LIFELN3 - Jul 20, 15:30 UTCJul 20, 15:50 UTC20m
2026-07-19 LIFELN3 - Jul 19, 20:30 UTCJul 19, 21:40 UTC1h 10m
2026-07-19 LIFELN3 - Jul 19, 18:55 UTCJul 19, 19:05 UTC10m
2026-07-18 LIFELN3 - Jul 18, 22:50 UTCJul 18, 23:25 UTC35m
2026-07-18 LIFELN3 - Jul 18, 07:10 UTCJul 18, 08:05 UTC55m
2026-07-18 LIFELN3 - Jul 18, 05:45 UTCJul 18, 06:35 UTC50m
2026-07-17 LIFELN3 - Jul 17, 20:55 UTCJul 17, 21:34 UTC40m
2026-07-17 LIFELN3 - Jul 17, 18:05 UTCJul 17, 18:25 UTC20m
2026-07-17 LIFELN3 - Jul 17, 16:19 UTCJul 17, 16:44 UTC25m
2026-07-17 LIFELN3 - Jul 17, 10:05 UTCJul 17, 11:00 UTC55m
2026-07-17 LIFELN3 - Jul 17, 08:59 UTCJul 17, 09:30 UTC30m
2026-07-17 LIFELN3 - Jul 17, 07:30 UTCJul 17, 08:00 UTC30m
2026-07-16 LIFELN3 - Jul 16, 20:29 UTCJul 16, 20:49 UTC20m
2026-07-16 LIFELN3 - Jul 16, 17:35 UTCJul 16, 17:54 UTC20m
2026-07-16 LIFELN3 - Jul 16, 15:45 UTCJul 16, 16:55 UTC1h 10m
2026-07-16 LIFELN3 - Jul 16, 01:15 UTCJul 16, 01:55 UTC40m
2026-07-15 LIFELN3 - Jul 15, 20:30 UTCJul 15, 20:50 UTC20m
2026-07-15 LIFELN3 - Jul 15, 19:25 UTCJul 15, 19:45 UTC20m
2026-07-13 - - Jul 13, 00:30 UTCJul 13, 00:45 UTC15m
2026-07-12 LIFELN3 - Jul 12, 21:40 UTCJul 12, 21:50 UTC10m
2026-07-11 LIFELN3 FNL → CYS Jul 11, 04:01 UTCJul 11, 04:40 UTC40m
2026-07-11 LIFELN3 - Jul 11, 03:01 UTCJul 11, 03:25 UTC25m
2026-07-10 LIFELN3 - Jul 10, 06:35 UTCJul 10, 07:30 UTC55m

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 N934EM page for operator, model, and routing details .

Mode-S ACF4F5 frequently asked

What is Mode-S code ACF4F5?
ACF4F5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N934EM.
Where is Mode-S ACF4F5 registered?
Mode-S code ACF4F5 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 ACF4F5 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ACF4F5, octal 53172365, decimal 11,334,901.
What flights does ACF4F5 operate?
Mode-S ACF4F5 has broadcast 1 distinct callsign, including LIFELN3.