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sensors Mode-S transponder

A438CB

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N371PD · HUGHES 500 · operated by CITY OF ATLANTA

Hex
A438CB
Octal
51034313
Decimal
10,762,443
Country
US
Tail
N371PD
Type
H500
No current signal · last broadcast Jul 25, 22:30 UTC
Flights observed
95
Distinct callsigns
1
Country
US
Last broadcast
Jul 25, 22:30 UTC

Last known position

Most recent position reported by Mode-S A438CB.

Country allocation

The ICAO 24-bit address A438CB 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
N371PD - 95 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 N371PD - Jul 25, 21:40 UTCJul 25, 22:30 UTC50m
2026-07-23 N371PD - Jul 23, 02:30 UTCJul 23, 03:00 UTC30m
2026-07-22 N371PD - Jul 22, 19:10 UTCJul 22, 20:25 UTC1h 15m
2026-07-22 N371PD ATL → ATL Jul 22, 18:00 UTCJul 22, 18:30 UTC30m
2026-07-19 N371PD - Jul 19, 01:20 UTCJul 19, 02:35 UTC1h 15m
2026-07-18 N371PD - Jul 18, 19:35 UTCJul 18, 22:05 UTC2h 30m
2026-07-18 N371PD - Jul 18, 00:35 UTCJul 18, 03:20 UTC2h 46m
2026-07-17 N371PD - Jul 17, 01:05 UTCJul 17, 01:15 UTC10m
2026-07-17 N371PD - Jul 17, 00:04 UTCJul 17, 01:00 UTC55m
2026-07-16 N371PD - Jul 16, 19:20 UTCJul 16, 20:05 UTC45m
2026-07-02 N371PD - Jul 2, 17:05 UTCJul 2, 17:20 UTC15m
2026-06-30 N371PD - Jun 30, 13:50 UTCJun 30, 14:05 UTC15m
2026-06-28 N371PD ATL → ATL Jun 28, 05:34 UTCJun 28, 06:49 UTC1h 15m
2026-06-28 N371PD - Jun 28, 02:44 UTCJun 28, 04:05 UTC1h 20m
2026-06-27 N371PD - Jun 27, 23:39 UTCJun 28, 00:50 UTC1h 10m
2026-06-27 N371PD - Jun 27, 21:59 UTCJun 27, 22:29 UTC30m
2026-06-27 N371PD - Jun 27, 19:00 UTCJun 27, 19:19 UTC20m
2026-06-27 N371PD - Jun 27, 17:20 UTCJun 27, 17:39 UTC20m
2026-06-27 N371PD - Jun 27, 16:35 UTCJun 27, 16:49 UTC15m
2026-06-27 N371PD ATL → ATL Jun 27, 04:09 UTCJun 27, 05:25 UTC1h 15m
2026-06-26 N371PD - Jun 26, 23:44 UTCJun 27, 01:00 UTC1h 15m
2026-06-26 N371PD - Jun 26, 17:44 UTCJun 26, 18:09 UTC25m
2026-06-26 N371PD - Jun 26, 06:19 UTCJun 26, 06:29 UTC10m
2026-06-26 N371PD - Jun 26, 05:55 UTCJun 26, 06:15 UTC20m
2026-06-26 N371PD - Jun 26, 04:24 UTCJun 26, 05:39 UTC1h 15m
2026-06-26 N371PD - Jun 26, 00:24 UTCJun 26, 01:45 UTC1h 20m
2026-06-25 N371PD - Jun 25, 22:54 UTCJun 25, 23:39 UTC45m
2026-06-25 N371PD - Jun 25, 20:45 UTCJun 25, 21:15 UTC30m
2026-06-25 N371PD - Jun 25, 00:55 UTCJun 25, 04:14 UTC3h 20m
2026-06-24 N371PD - Jun 24, 22:49 UTCJun 25, 00:05 UTC1h 15m
2026-06-24 N371PD - Jun 24, 19:29 UTCJun 24, 19:59 UTC30m
2026-06-24 N371PD - Jun 24, 17:20 UTCJun 24, 17:55 UTC35m
2026-06-24 N371PD - Jun 24, 14:20 UTCJun 24, 15:05 UTC45m
2026-06-24 N371PD - Jun 24, 12:50 UTCJun 24, 13:05 UTC15m
2026-06-22 N371PD - Jun 22, 04:19 UTCJun 22, 05:20 UTC1h 0m
2026-06-22 N371PD - Jun 22, 00:34 UTCJun 22, 03:05 UTC2h 30m
2026-06-21 N371PD - Jun 21, 23:44 UTCJun 21, 23:59 UTC15m
2026-06-21 N371PD - Jun 21, 19:50 UTCJun 21, 20:00 UTC10m
2026-06-21 N371PD - Jun 21, 19:34 UTCJun 21, 19:45 UTC10m
2026-06-21 N371PD - Jun 21, 16:54 UTCJun 21, 18:25 UTC1h 30m
2026-06-21 N371PD - Jun 21, 03:30 UTCJun 21, 03:59 UTC30m
2026-06-21 N371PD - Jun 21, 01:39 UTCJun 21, 02:30 UTC50m
2026-06-20 N371PD - Jun 20, 23:29 UTCJun 21, 00:49 UTC1h 20m
2026-06-20 N371PD - Jun 20, 19:49 UTCJun 20, 20:29 UTC40m
2026-06-20 N371PD - Jun 20, 18:24 UTCJun 20, 18:29 UTC5m
2026-06-20 N371PD - Jun 20, 16:39 UTCJun 20, 16:59 UTC20m
2026-06-20 N371PD - Jun 20, 07:00 UTCJun 20, 08:14 UTC1h 15m
2026-06-20 N371PD - Jun 20, 01:44 UTCJun 20, 03:04 UTC1h 20m
2026-06-19 N371PD - Jun 19, 23:25 UTCJun 20, 00:39 UTC1h 15m
2026-06-19 N371PD - Jun 19, 21:24 UTCJun 19, 21:39 UTC15m

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 N371PD page for operator, model, and routing details .

Mode-S A438CB frequently asked

What is Mode-S code A438CB?
A438CB is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N371PD.
Where is Mode-S A438CB registered?
Mode-S code A438CB 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 A438CB broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 22:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A438CB, octal 51034313, decimal 10,762,443.
What flights does A438CB operate?
Mode-S A438CB has broadcast 1 distinct callsign, including N371PD.