Apparatus

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sensors Mode-S transponder

A19F73

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N203ZM · PIPISTREL Alpha Trainer · operated by MERAKI AVIATION LLC

Hex
A19F73
Octal
50317563
Decimal
10,592,115
Country
US
Tail
N203ZM
Type
PIAT
No current signal · last broadcast 2h ago
Flights observed
98
Distinct callsigns
1
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S A19F73.

Country allocation

The ICAO 24-bit address A19F73 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
N203ZM - 98 2026-06-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-16 N203ZM - Jun 16, 23:30 UTCJun 17, 00:00 UTC30m
2026-06-16 N203ZM - Jun 16, 20:05 UTCJun 16, 21:45 UTC1h 40m
2026-06-16 N203ZM - Jun 16, 01:40 UTCJun 16, 02:45 UTC1h 5m
2026-06-15 N203ZM TOA → TOA Jun 15, 22:10 UTCJun 16, 00:00 UTC1h 50m
2026-06-15 N203ZM TOA → TOA Jun 15, 19:25 UTCJun 15, 21:20 UTC1h 55m
2026-06-15 N203ZM - Jun 15, 01:55 UTCJun 15, 02:30 UTC35m
2026-06-14 N203ZM TOA → TOA Jun 14, 22:30 UTCJun 15, 00:05 UTC1h 35m
2026-06-14 N203ZM TOA → TOA Jun 14, 19:30 UTCJun 14, 21:00 UTC1h 30m
2026-06-14 N203ZM - Jun 14, 00:15 UTCJun 14, 02:00 UTC1h 45m
2026-06-13 N203ZM - Jun 13, 18:10 UTCJun 13, 19:40 UTC1h 30m
2026-06-13 N203ZM - Jun 13, 00:30 UTCJun 13, 02:05 UTC1h 35m
2026-06-12 N203ZM - Jun 12, 21:10 UTCJun 12, 22:05 UTC55m
2026-06-12 N203ZM - Jun 12, 00:35 UTCJun 12, 01:55 UTC1h 20m
2026-06-11 N203ZM TOA → TOA Jun 11, 21:20 UTCJun 11, 22:45 UTC1h 25m
2026-06-10 N203ZM TOA → TOA Jun 10, 18:10 UTCJun 10, 19:45 UTC1h 35m
2026-06-10 N203ZM TOA → TOA Jun 10, 01:20 UTCJun 10, 03:00 UTC1h 40m
2026-06-09 N203ZM TOA → TOA Jun 9, 22:30 UTCJun 9, 23:50 UTC1h 20m
2026-06-09 N203ZM - Jun 9, 19:50 UTCJun 9, 20:35 UTC45m
2026-06-09 N203ZM TOA → TOA Jun 9, 01:50 UTCJun 9, 02:25 UTC35m
2026-06-09 N203ZM - Jun 9, 00:00 UTCJun 9, 00:35 UTC35m
2026-06-08 N203ZM TOA → TOA Jun 8, 17:50 UTCJun 8, 18:40 UTC50m
2026-05-31 N203ZM TOA → TOA May 31, 23:40 UTCJun 1, 00:35 UTC55m
2026-05-31 N203ZM - May 31, 21:55 UTCMay 31, 22:30 UTC35m
2026-05-31 N203ZM - May 31, 20:10 UTCMay 31, 20:55 UTC45m
2026-05-31 N203ZM - May 31, 00:05 UTCMay 31, 00:55 UTC50m
2026-05-30 N203ZM TOA → TOA May 30, 22:30 UTCMay 30, 23:10 UTC40m
2026-05-30 N203ZM TOA → TOA May 30, 17:55 UTCMay 30, 18:10 UTC15m
2026-05-29 N203ZM TOA → TOA May 29, 17:10 UTCMay 29, 17:50 UTC40m
2026-05-27 N203ZM - May 27, 17:25 UTCMay 27, 18:05 UTC40m
2026-05-26 N203ZM - May 26, 20:24 UTCMay 26, 20:45 UTC20m
2026-05-26 N203ZM TOA → TOA May 26, 17:09 UTCMay 26, 17:50 UTC40m
2026-05-25 N203ZM - May 25, 22:00 UTCMay 25, 23:00 UTC1h 0m
2026-05-24 N203ZM - May 24, 23:00 UTCMay 24, 23:46 UTC46m
2026-05-24 N203ZM TOA → TOA May 24, 18:05 UTCMay 24, 18:55 UTC50m
2026-05-23 N203ZM - May 23, 17:45 UTCMay 23, 19:35 UTC1h 50m
2026-05-23 N203ZM TOA → TOA May 23, 00:40 UTCMay 23, 02:55 UTC2h 14m
2026-05-22 N203ZM TOA → TOA May 22, 20:45 UTCMay 22, 21:15 UTC30m
2026-05-22 N203ZM - May 22, 01:40 UTCMay 22, 02:15 UTC35m
2026-05-21 N203ZM TOA → TOA May 21, 23:50 UTCMay 22, 00:55 UTC1h 5m
2026-05-21 N203ZM TOA → TOA May 21, 22:20 UTCMay 21, 22:55 UTC35m
2026-05-19 N203ZM TOA → TOA May 19, 00:10 UTCMay 19, 00:25 UTC15m
2026-05-18 N203ZM - May 18, 23:00 UTCMay 18, 23:35 UTC35m
2026-05-18 N203ZM - May 18, 21:30 UTCMay 18, 22:05 UTC35m
2026-05-18 N203ZM TOA → TOA May 18, 02:10 UTCMay 18, 03:20 UTC1h 10m
2026-05-17 N203ZM TOA → TOA May 17, 22:45 UTCMay 17, 23:45 UTC1h 0m
2026-05-17 N203ZM TOA → TOA May 17, 00:55 UTCMay 17, 02:25 UTC1h 30m
2026-05-16 N203ZM TOA → TOA May 16, 21:15 UTCMay 16, 22:35 UTC1h 20m
2026-05-16 N203ZM - May 16, 18:40 UTCMay 16, 19:40 UTC1h 0m
2026-05-16 N203ZM - May 16, 02:20 UTCMay 16, 03:00 UTC40m
2026-05-15 N203ZM TOA → TOA May 15, 22:10 UTCMay 15, 23:00 UTC50m

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 N203ZM page for operator, model, and routing details .

Mode-S A19F73 frequently asked

What is Mode-S code A19F73?
A19F73 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N203ZM.
Where is Mode-S A19F73 registered?
Mode-S code A19F73 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 A19F73 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A19F73, octal 50317563, decimal 10,592,115.
What flights does A19F73 operate?
Mode-S A19F73 has broadcast 1 distinct callsign, including N203ZM.