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sensors Mode-S transponder

A1021A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N164S · PILATUS PC-12 · operated by LIFE FLIGHT NETWORK LLC

Hex
A1021A
Octal
50201032
Decimal
10,551,834
Country
US
Tail
N164S
Type
PC12
No current signal · last broadcast Jul 26, 18:55 UTC
Flights observed
83
Distinct callsigns
1
Country
US
Last broadcast
Jul 26, 18:55 UTC

Last known position

Most recent position reported by Mode-S A1021A.

Country allocation

The ICAO 24-bit address A1021A 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
N164S - 83 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N164S - Jul 26, 18:45 UTCJul 26, 18:55 UTC10m
2026-07-26 N164S - Jul 26, 03:25 UTCJul 26, 04:20 UTC55m
2026-07-26 N164S - Jul 26, 01:00 UTCJul 26, 02:30 UTC1h 30m
2026-07-25 N164S - Jul 25, 08:15 UTCJul 25, 10:30 UTC2h 15m
2026-07-25 N164S - Jul 25, 05:35 UTCJul 25, 06:25 UTC50m
2026-07-25 N164S - Jul 25, 03:00 UTCJul 25, 03:45 UTC45m
2026-07-24 N164S - Jul 24, 05:55 UTCJul 24, 08:15 UTC2h 20m
2026-07-24 N164S - Jul 24, 02:05 UTCJul 24, 03:55 UTC1h 50m
2026-07-23 N164S - Jul 23, 21:00 UTCJul 23, 21:50 UTC50m
2026-07-08 N164S - Jul 8, 21:35 UTCJul 8, 22:55 UTC1h 20m
2026-07-07 N164S - Jul 7, 23:55 UTCJul 8, 00:40 UTC45m
2026-07-07 N164S - Jul 7, 01:05 UTCJul 7, 01:50 UTC45m
2026-07-04 N164S - Jul 4, 02:20 UTCJul 4, 03:35 UTC1h 15m
2026-07-04 N164S - Jul 4, 01:00 UTCJul 4, 01:25 UTC25m
2026-07-03 N164S - Jul 3, 23:40 UTCJul 4, 00:10 UTC30m
2026-06-28 N164S - Jun 28, 01:34 UTCJun 28, 02:20 UTC45m
2026-06-28 N164S RNT → RNT Jun 28, 00:09 UTCJun 28, 00:39 UTC30m
2026-06-27 N164S - Jun 27, 19:24 UTCJun 27, 20:24 UTC1h 0m
2026-06-27 N164S - Jun 27, 17:29 UTCJun 27, 18:20 UTC50m
2026-06-25 N164S - Jun 25, 22:54 UTCJun 25, 23:09 UTC15m
2026-06-19 N164S - Jun 19, 06:10 UTCJun 19, 06:39 UTC30m
2026-06-19 N164S - Jun 19, 04:29 UTCJun 19, 05:00 UTC30m
2026-06-19 N164S - Jun 19, 03:15 UTCJun 19, 03:49 UTC35m
2026-06-18 N164S - Jun 18, 23:20 UTCJun 19, 01:19 UTC1h 59m
2026-06-18 N164S - Jun 18, 22:00 UTCJun 18, 22:10 UTC10m
2026-06-18 N164S - Jun 18, 19:40 UTCJun 18, 21:00 UTC1h 20m
2026-06-18 N164S - Jun 18, 04:05 UTCJun 18, 06:15 UTC2h 10m
2026-06-17 N164S - Jun 17, 04:40 UTCJun 17, 05:30 UTC50m
2026-06-17 N164S - Jun 17, 03:30 UTCJun 17, 04:30 UTC1h 0m
2026-06-16 N164S BOI → HIO Jun 16, 23:45 UTCJun 17, 01:25 UTC1h 40m
2026-06-16 N164S - Jun 16, 21:15 UTCJun 16, 22:30 UTC1h 15m
2026-06-16 N164S - Jun 16, 20:30 UTCJun 16, 20:35 UTC5m
2026-06-16 N164S - Jun 16, 01:55 UTCJun 16, 03:10 UTC1h 15m
2026-06-15 N164S - Jun 15, 21:20 UTCJun 15, 22:25 UTC1h 5m
2026-06-15 N164S - Jun 15, 18:45 UTCJun 15, 19:55 UTC1h 10m
2026-06-15 N164S - Jun 15, 03:24 UTCJun 15, 04:40 UTC1h 15m
2026-06-12 N164S - Jun 12, 21:10 UTCJun 12, 22:05 UTC55m
2026-06-11 N164S - Jun 11, 03:05 UTCJun 11, 04:20 UTC1h 15m
2026-06-11 N164S - Jun 11, 02:25 UTCJun 11, 03:00 UTC35m
2026-06-09 N164S - Jun 9, 21:25 UTCJun 9, 22:55 UTC1h 30m
2026-06-09 N164S - Jun 9, 19:00 UTCJun 9, 20:15 UTC1h 15m
2026-06-09 N164S - Jun 9, 17:20 UTCJun 9, 18:30 UTC1h 10m
2026-06-05 N164S - Jun 5, 21:55 UTCJun 5, 22:35 UTC40m
2026-06-05 N164S - Jun 5, 19:15 UTCJun 5, 19:45 UTC30m
2026-05-29 N164S - May 29, 22:50 UTCMay 29, 23:45 UTC55m
2026-05-29 N164S - May 29, 20:15 UTCMay 29, 20:45 UTC30m
2026-05-29 N164S - May 29, 19:30 UTCMay 29, 19:40 UTC10m
2026-05-29 N164S - May 29, 17:25 UTCMay 29, 18:45 UTC1h 20m
2026-05-26 N164S - May 26, 22:50 UTCMay 26, 23:45 UTC55m
2026-05-19 N164S - May 19, 19:25 UTCMay 19, 19:55 UTC30m

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 N164S page for operator, model, and routing details .

Mode-S A1021A frequently asked

What is Mode-S code A1021A?
A1021A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N164S.
Where is Mode-S A1021A registered?
Mode-S code A1021A 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 A1021A broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 18:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1021A, octal 50201032, decimal 10,551,834.
What flights does A1021A operate?
Mode-S A1021A has broadcast 1 distinct callsign, including N164S.