Apparatus

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sensors Mode-S transponder

A373C0

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N321TR · BEECH F90 King Air · operated by VERTIVUE LLC

Hex
A373C0
Octal
50671700
Decimal
10,712,000
Country
US
Tail
N321TR
Type
BE9T
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
183
Distinct callsigns
1
Country
US
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S A373C0.

Country allocation

The ICAO 24-bit address A373C0 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
N321TR - 183 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N321TR - Jul 26, 20:20 UTCJul 26, 21:45 UTC1h 25m
2026-07-26 N321TR - Jul 26, 19:10 UTCJul 26, 20:00 UTC50m
2026-07-26 N321TR - Jul 26, 17:20 UTCJul 26, 18:25 UTC1h 5m
2026-07-26 N321TR - Jul 26, 14:25 UTCJul 26, 16:15 UTC1h 50m
2026-07-26 N321TR - Jul 26, 12:35 UTCJul 26, 13:50 UTC1h 15m
2026-07-23 N321TR - Jul 23, 20:15 UTCJul 23, 21:10 UTC55m
2026-07-23 N321TR - Jul 23, 18:55 UTCJul 23, 19:10 UTC15m
2026-07-23 N321TR - Jul 23, 16:20 UTCJul 23, 18:00 UTC1h 40m
2026-07-23 N321TR - Jul 23, 14:20 UTCJul 23, 15:40 UTC1h 20m
2026-07-23 N321TR - Jul 23, 13:05 UTCJul 23, 13:25 UTC20m
2026-07-23 N321TR - Jul 23, 10:25 UTCJul 23, 12:10 UTC1h 45m
2026-07-22 N321TR - Jul 22, 18:30 UTCJul 22, 19:50 UTC1h 20m
2026-07-22 N321TR - Jul 22, 13:20 UTCJul 22, 15:45 UTC2h 25m
2026-07-20 N321TR - Jul 20, 17:00 UTCJul 20, 17:15 UTC15m
2026-07-20 N321TR - Jul 20, 15:25 UTCJul 20, 16:20 UTC55m
2026-07-20 N321TR - Jul 20, 14:30 UTCJul 20, 14:45 UTC15m
2026-07-20 N321TR - Jul 20, 12:30 UTCJul 20, 13:55 UTC1h 25m
2026-07-20 N321TR - Jul 20, 11:25 UTCJul 20, 11:50 UTC25m
2026-07-20 N321TR - Jul 20, 10:45 UTCJul 20, 10:55 UTC10m
2026-07-19 N321TR - Jul 19, 19:10 UTCJul 19, 19:45 UTC35m
2026-07-19 N321TR - Jul 19, 15:55 UTCJul 19, 17:45 UTC1h 50m
2026-07-19 N321TR - Jul 19, 13:05 UTCJul 19, 13:55 UTC50m
2026-07-19 N321TR - Jul 19, 11:50 UTCJul 19, 12:25 UTC35m
2026-07-13 N321TR - Jul 13, 13:15 UTCJul 13, 13:25 UTC10m
2026-07-13 N321TR - Jul 13, 12:15 UTCJul 13, 12:50 UTC35m
2026-07-13 N321TR - Jul 13, 10:55 UTCJul 13, 11:30 UTC35m
2026-07-12 N321TR - Jul 12, 20:20 UTCJul 12, 21:10 UTC50m
2026-07-12 N321TR - Jul 12, 18:35 UTCJul 12, 19:25 UTC50m
2026-07-11 N321TR - Jul 11, 15:05 UTCJul 11, 15:35 UTC30m
2026-07-11 N321TR - Jul 11, 13:00 UTCJul 11, 14:20 UTC1h 20m
2026-07-10 N321TR - Jul 10, 21:30 UTCJul 10, 22:50 UTC1h 20m
2026-07-10 N321TR - Jul 10, 19:00 UTCJul 10, 21:05 UTC2h 6m
2026-07-10 N321TR - Jul 10, 13:40 UTCJul 10, 17:40 UTC4h 0m
2026-07-09 N321TR - Jul 9, 20:25 UTCJul 9, 21:10 UTC45m
2026-07-09 N321TR - Jul 9, 18:45 UTCJul 9, 19:35 UTC50m
2026-07-09 N321TR ABE → RDG Jul 9, 18:10 UTCJul 9, 18:20 UTC10m
2026-07-09 N321TR - Jul 9, 03:10 UTCJul 9, 04:35 UTC1h 25m
2026-07-09 N321TR TEB → RDU Jul 9, 00:35 UTCJul 9, 02:25 UTC1h 50m
2026-07-08 N321TR - Jul 8, 21:40 UTCJul 8, 23:15 UTC1h 35m
2026-07-08 N321TR - Jul 8, 19:30 UTCJul 8, 21:05 UTC1h 35m
2026-07-06 N321TR - Jul 6, 14:55 UTCJul 6, 16:20 UTC1h 25m
2026-07-06 N321TR LDJ → MVY Jul 6, 12:55 UTCJul 6, 13:45 UTC50m
2026-07-06 N321TR - Jul 6, 10:15 UTCJul 6, 12:05 UTC1h 50m
2026-07-05 N321TR - Jul 5, 20:55 UTCJul 5, 21:40 UTC45m
2026-07-05 N321TR - Jul 5, 16:25 UTCJul 5, 19:00 UTC2h 35m
2026-07-05 N321TR - Jul 5, 15:40 UTCJul 5, 15:55 UTC15m
2026-07-05 N321TR - Jul 5, 14:10 UTCJul 5, 15:20 UTC1h 10m
2026-07-03 N321TR - Jul 3, 17:05 UTCJul 3, 17:55 UTC50m
2026-07-03 N321TR - Jul 3, 14:15 UTCJul 3, 15:45 UTC1h 30m
2026-07-02 N321TR - Jul 2, 22:00 UTCJul 2, 23:40 UTC1h 40m

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 N321TR page for operator, model, and routing details .

Mode-S A373C0 frequently asked

What is Mode-S code A373C0?
A373C0 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N321TR.
Where is Mode-S A373C0 registered?
Mode-S code A373C0 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 A373C0 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A373C0, octal 50671700, decimal 10,712,000.
What flights does A373C0 operate?
Mode-S A373C0 has broadcast 1 distinct callsign, including N321TR.