Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A3CD77

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N344PH · AIRBUS HELICOPTERS EC-135/635 · operated by PHI HEALTH LLC

Hex
A3CD77
Octal
50746567
Decimal
10,734,967
Country
US
Tail
N344PH
Type
EC35
No current signal · last broadcast Jul 24, 22:45 UTC
Flights observed
132
Distinct callsigns
1
Country
US
Last broadcast
Jul 24, 22:45 UTC

Last known position

Most recent position reported by Mode-S A3CD77.

Country allocation

The ICAO 24-bit address A3CD77 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
N344PH - 132 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 N344PH - Jul 24, 22:35 UTCJul 24, 22:45 UTC10m
2026-07-24 N344PH - Jul 24, 17:55 UTCJul 24, 18:10 UTC15m
2026-07-24 N344PH - Jul 24, 16:50 UTCJul 24, 17:00 UTC10m
2026-07-23 N344PH - Jul 23, 20:20 UTCJul 23, 20:35 UTC15m
2026-07-23 N344PH - Jul 23, 01:50 UTCJul 23, 02:00 UTC10m
2026-07-22 N344PH - Jul 22, 14:50 UTCJul 22, 15:00 UTC10m
2026-07-18 N344PH - Jul 18, 19:55 UTCJul 18, 20:05 UTC10m
2026-07-18 N344PH - Jul 18, 12:40 UTCJul 18, 12:55 UTC15m
2026-07-16 N344PH - Jul 16, 03:30 UTCJul 16, 03:50 UTC20m
2026-07-16 N344PH - Jul 16, 02:10 UTCJul 16, 02:25 UTC15m
2026-07-13 N344PH - Jul 13, 17:20 UTCJul 13, 17:30 UTC10m
2026-07-12 N344PH - Jul 12, 12:25 UTCJul 12, 12:40 UTC15m
2026-07-12 N344PH - Jul 12, 09:30 UTCJul 12, 09:55 UTC25m
2026-07-12 N344PH - Jul 12, 08:40 UTCJul 12, 08:50 UTC10m
2026-07-10 N344PH - Jul 10, 03:20 UTCJul 10, 03:30 UTC10m
2026-07-09 N344PH - Jul 9, 16:10 UTCJul 9, 16:20 UTC10m
2026-07-07 N344PH - Jul 7, 22:30 UTCJul 7, 22:40 UTC10m
2026-07-05 N344PH - Jul 5, 01:15 UTCJul 5, 02:05 UTC50m
2026-07-04 N344PH - Jul 4, 22:15 UTCJul 4, 22:25 UTC10m
2026-07-04 N344PH - Jul 4, 21:25 UTCJul 4, 21:35 UTC10m
2026-07-02 N344PH - Jul 2, 16:00 UTCJul 2, 16:40 UTC40m
2026-07-01 N344PH - Jul 1, 09:25 UTCJul 1, 09:35 UTC10m
2026-06-30 N344PH - Jun 30, 18:15 UTCJun 30, 18:25 UTC10m
2026-06-30 N344PH - Jun 30, 15:05 UTCJun 30, 15:15 UTC10m
2026-06-29 N344PH - Jun 29, 05:34 UTCJun 29, 05:45 UTC10m
2026-06-29 N344PH - Jun 29, 03:54 UTCJun 29, 04:39 UTC45m
2026-06-28 N344PH - Jun 28, 22:29 UTCJun 28, 22:49 UTC20m
2026-06-28 N344PH - Jun 28, 14:19 UTCJun 28, 14:45 UTC25m
2026-06-28 N344PH - Jun 28, 02:05 UTCJun 28, 02:14 UTC10m
2026-06-28 N344PH - Jun 28, 00:35 UTCJun 28, 01:34 UTC1h 0m
2026-06-27 N344PH - Jun 27, 21:10 UTCJun 27, 21:29 UTC20m
2026-06-26 N344PH - Jun 26, 20:55 UTCJun 26, 21:15 UTC20m
2026-06-26 N344PH - Jun 26, 14:35 UTCJun 26, 14:59 UTC25m
2026-06-25 N344PH - Jun 25, 17:09 UTCJun 25, 17:20 UTC10m
2026-06-25 N344PH - Jun 25, 03:44 UTCJun 25, 03:54 UTC10m
2026-06-25 N344PH - Jun 25, 00:55 UTCJun 25, 01:04 UTC10m
2026-06-24 N344PH - Jun 24, 16:24 UTCJun 24, 16:40 UTC15m
2026-06-24 N344PH - Jun 24, 13:24 UTCJun 24, 13:50 UTC25m
2026-06-23 N344PH - Jun 23, 12:05 UTCJun 23, 12:45 UTC40m
2026-06-23 N344PH - Jun 23, 00:09 UTCJun 23, 00:19 UTC10m
2026-06-22 N344PH - Jun 22, 00:55 UTCJun 22, 01:05 UTC10m
2026-06-20 N344PH - Jun 20, 17:29 UTCJun 20, 18:04 UTC35m
2026-06-20 N344PH - Jun 20, 03:29 UTCJun 20, 03:39 UTC10m
2026-06-20 N344PH - Jun 20, 01:55 UTCJun 20, 02:35 UTC40m
2026-06-19 N344PH - Jun 19, 23:19 UTCJun 19, 23:29 UTC10m
2026-06-19 N344PH - Jun 19, 21:30 UTCJun 19, 21:44 UTC15m
2026-06-19 N344PH - Jun 19, 11:14 UTCJun 19, 11:39 UTC25m
2026-06-19 N344PH - Jun 19, 10:04 UTCJun 19, 10:44 UTC40m
2026-06-19 N344PH - Jun 19, 08:40 UTCJun 19, 09:24 UTC45m
2026-06-19 N344PH - Jun 19, 07:34 UTCJun 19, 07:59 UTC25m

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 N344PH page for operator, model, and routing details .

Mode-S A3CD77 frequently asked

What is Mode-S code A3CD77?
A3CD77 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N344PH.
Where is Mode-S A3CD77 registered?
Mode-S code A3CD77 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 A3CD77 broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 22:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A3CD77, octal 50746567, decimal 10,734,967.
What flights does A3CD77 operate?
Mode-S A3CD77 has broadcast 1 distinct callsign, including N344PH.