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sensors Mode-S transponder

A3B11D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N337PH · AIRBUS HELICOPTERS EC-135/635 · operated by PHI HEALTH LLC

Hex
A3B11D
Octal
50730435
Decimal
10,727,709
Country
US
Tail
N337PH
Type
EC35
No current signal · last broadcast 1d ago
Flights observed
285
Distinct callsigns
1
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A3B11D.

Country allocation

The ICAO 24-bit address A3B11D 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
N337PH - 183 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N337PH - Jul 26, 20:35 UTCJul 26, 21:10 UTC35m
2026-07-26 N337PH - Jul 26, 17:20 UTCJul 26, 17:30 UTC10m
2026-07-26 N337PH - Jul 26, 16:00 UTCJul 26, 16:10 UTC10m
2026-07-25 N337PH - Jul 25, 16:10 UTCJul 25, 16:30 UTC20m
2026-07-25 N337PH - Jul 25, 14:55 UTCJul 25, 15:25 UTC30m
2026-07-25 N337PH - Jul 25, 01:30 UTCJul 25, 01:55 UTC25m
2026-07-24 N337PH - Jul 24, 23:50 UTCJul 25, 00:55 UTC1h 5m
2026-07-24 N337PH - Jul 24, 05:10 UTCJul 24, 05:20 UTC10m
2026-07-24 N337PH - Jul 24, 01:55 UTCJul 24, 02:35 UTC40m
2026-07-23 N337PH - Jul 23, 15:00 UTCJul 23, 15:35 UTC35m
2026-07-23 N337PH - Jul 23, 14:00 UTCJul 23, 14:10 UTC10m
2026-07-23 N337PH - Jul 23, 01:35 UTCJul 23, 02:30 UTC55m
2026-07-23 N337PH - Jul 23, 00:45 UTCJul 23, 01:00 UTC15m
2026-07-22 N337PH - Jul 22, 23:15 UTCJul 23, 00:00 UTC45m
2026-07-22 - - Jul 22, 20:30 UTCJul 22, 20:40 UTC10m
2026-07-22 - - Jul 22, 19:20 UTCJul 22, 19:35 UTC15m
2026-07-22 - - Jul 22, 18:25 UTCJul 22, 18:35 UTC10m
2026-07-22 - - Jul 22, 16:30 UTCJul 22, 16:40 UTC10m
2026-07-22 - - Jul 22, 15:05 UTCJul 22, 15:20 UTC15m
2026-07-22 - - Jul 22, 14:10 UTCJul 22, 14:20 UTC10m
2026-07-22 N337PH - Jul 22, 03:55 UTCJul 22, 04:05 UTC10m
2026-07-20 - - Jul 20, 19:30 UTCJul 20, 20:20 UTC50m
2026-07-20 - - Jul 20, 15:50 UTCJul 20, 16:10 UTC20m
2026-07-20 - - Jul 20, 14:40 UTCJul 20, 14:50 UTC10m
2026-07-20 - - Jul 20, 13:05 UTCJul 20, 13:15 UTC10m
2026-07-19 N337PH - Jul 19, 09:35 UTCJul 19, 10:00 UTC25m
2026-07-19 N337PH - Jul 19, 07:00 UTCJul 19, 07:30 UTC30m
2026-07-19 N337PH - Jul 19, 06:10 UTCJul 19, 06:25 UTC15m
2026-07-18 N337PH - Jul 18, 22:45 UTCJul 19, 00:20 UTC1h 35m
2026-07-18 - - Jul 18, 21:30 UTCJul 18, 21:40 UTC10m
2026-07-18 N337PH - Jul 18, 02:25 UTCJul 18, 03:15 UTC51m
2026-07-17 N337PH - Jul 17, 20:35 UTCJul 17, 20:44 UTC10m
2026-07-17 N337PH - Jul 17, 15:29 UTCJul 17, 15:55 UTC25m
2026-07-17 N337PH - Jul 17, 01:49 UTCJul 17, 02:05 UTC15m
2026-07-16 N337PH - Jul 16, 05:25 UTCJul 16, 05:35 UTC10m
2026-07-16 N337PH - Jul 16, 04:50 UTCJul 16, 05:15 UTC25m
2026-07-16 N337PH - Jul 16, 03:15 UTCJul 16, 03:35 UTC20m
2026-07-15 N337PH - Jul 15, 17:20 UTCJul 15, 17:30 UTC10m
2026-07-15 N337PH - Jul 15, 16:10 UTCJul 15, 16:20 UTC10m
2026-07-15 N337PH - Jul 15, 14:20 UTCJul 15, 14:35 UTC15m
2026-07-14 N337PH - Jul 14, 01:45 UTCJul 14, 02:00 UTC15m
2026-07-14 N337PH - Jul 14, 00:35 UTCJul 14, 01:10 UTC35m
2026-07-12 N337PH - Jul 12, 13:50 UTCJul 12, 14:25 UTC35m
2026-07-12 N337PH - Jul 12, 06:05 UTCJul 12, 07:01 UTC55m
2026-07-12 N337PH - Jul 12, 05:05 UTCJul 12, 05:20 UTC15m
2026-07-12 N337PH - Jul 12, 02:05 UTCJul 12, 03:05 UTC1h 0m
2026-07-11 N337PH - Jul 11, 03:45 UTCJul 11, 04:45 UTC1h 0m
2026-07-11 N337PH - Jul 11, 00:10 UTCJul 11, 00:40 UTC30m
2026-07-10 N337PH - Jul 10, 22:10 UTCJul 10, 22:40 UTC30m
2026-07-10 N337PH - Jul 10, 16:15 UTCJul 10, 17:40 UTC1h 25m

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 N337PH page for operator, model, and routing details .

Mode-S A3B11D frequently asked

What is Mode-S code A3B11D?
A3B11D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N337PH.
Where is Mode-S A3B11D registered?
Mode-S code A3B11D 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 A3B11D broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A3B11D, octal 50730435, decimal 10,727,709.
What flights does A3B11D operate?
Mode-S A3B11D has broadcast 1 distinct callsign, including N337PH.