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sensors Mode-S transponder

A4C164

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N405YK · BOEING 737-400 · operated by NAS AIRCRAFT LEASING COMPANY LLC

Hex
A4C164
Octal
51140544
Decimal
10,797,412
Country
US
Tail
N405YK
Type
B734
No current signal · last broadcast 1d ago
Flights observed
388
Distinct callsigns
20
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A4C164.

Country allocation

The ICAO 24-bit address A4C164 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 20 distinct

Callsign Airline Flights Last seen
AAH443 - 26 2026-07-09
AAH442 - 23 2026-06-30
AAH445 - 19 2026-06-30
AAH444 - 19 2026-06-30
AAH57 - 18 2026-06-24
AAH56 - 17 2026-06-24
AAH552 - 17 2026-06-24
AAH15 - 17 2026-07-10
AAH553 - 16 2026-06-24
AAH27 - 16 2026-07-11
AAH17 - 16 2026-07-10
AAH26 - 15 2026-07-11
AAH18 - 14 2026-06-19
AAH55 Aloha Air Cargo 9 2026-05-27
AAH221 Aloha Air Cargo 9 2026-06-12
AAH16 - 9 2026-06-20
AAH11 - 9 2026-07-01
AAH54 Aloha Air Cargo 8 2026-05-27
AAH220 Aloha Air Cargo 8 2026-06-12
AAH551 - 7 2026-07-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-12 AAH41 - Jul 12, 17:25 UTCJul 12, 17:50 UTC25m
2026-07-12 AAH40 - Jul 12, 16:30 UTCJul 12, 16:55 UTC25m
2026-07-11 AAH551 - Jul 11, 10:25 UTCJul 11, 10:50 UTC25m
2026-07-11 AAH44 - Jul 11, 08:05 UTCJul 11, 08:30 UTC25m
2026-07-11 AAH27 - Jul 11, 05:01 UTCJul 11, 05:15 UTC15m
2026-07-11 AAH26 - Jul 11, 03:45 UTCJul 11, 04:05 UTC20m
2026-07-10 AAH17 - Jul 10, 16:50 UTCJul 10, 17:00 UTC10m
2026-07-10 AAH15 - Jul 10, 14:15 UTCJul 10, 14:25 UTC10m
2026-07-10 AAH43 - Jul 10, 05:35 UTCJul 10, 06:05 UTC30m
2026-07-09 AAH443 - Jul 9, 16:00 UTCJul 9, 16:25 UTC25m
2026-07-01 AAH12 - Jul 1, 09:15 UTCJul 1, 09:25 UTC10m
2026-07-01 AAH11 - Jul 1, 07:55 UTCJul 1, 08:05 UTC10m
2026-07-01 AAH43 - Jul 1, 04:50 UTCJul 1, 05:25 UTC35m
2026-07-01 AAH42 - Jul 1, 03:05 UTCJul 1, 03:35 UTC30m
2026-06-30 AAH445 - Jun 30, 18:30 UTCJun 30, 19:00 UTC30m
2026-06-30 AAH444 - Jun 30, 17:35 UTCJun 30, 18:00 UTC25m
2026-06-30 AAH443 - Jun 30, 16:25 UTCJun 30, 16:55 UTC30m
2026-06-30 AAH442 - Jun 30, 15:20 UTCJun 30, 15:45 UTC25m
2026-06-29 AAH445 - Jun 29, 19:54 UTCJun 29, 20:35 UTC40m
2026-06-29 AAH444 - Jun 29, 18:44 UTCJun 29, 19:15 UTC30m
2026-06-29 AAH443 KOA → HNL Jun 29, 17:10 UTCJun 29, 17:40 UTC30m
2026-06-29 AAH442 - Jun 29, 15:34 UTCJun 29, 16:00 UTC25m
2026-06-28 AAH41 KOA → HNL Jun 28, 17:04 UTCJun 28, 17:34 UTC30m
2026-06-28 AAH40 HNL → KOA Jun 28, 16:05 UTCJun 28, 16:29 UTC25m
2026-06-24 AAH553 - Jun 24, 16:29 UTCJun 24, 16:59 UTC30m
2026-06-24 AAH552 - Jun 24, 15:14 UTCJun 24, 15:35 UTC20m
2026-06-24 AAH57 - Jun 24, 12:54 UTCJun 24, 13:24 UTC30m
2026-06-24 AAH56 - Jun 24, 11:29 UTCJun 24, 11:50 UTC20m
2026-06-23 AAH553 - Jun 23, 16:05 UTCJun 23, 16:29 UTC25m
2026-06-23 AAH552 - Jun 23, 14:49 UTCJun 23, 15:09 UTC20m
2026-06-23 AAH57 - Jun 23, 13:09 UTCJun 23, 13:34 UTC25m
2026-06-23 AAH56 - Jun 23, 11:35 UTCJun 23, 11:59 UTC25m
2026-06-22 AAH445 KOA → HNL Jun 22, 18:40 UTCJun 22, 19:09 UTC30m
2026-06-22 AAH444 - Jun 22, 17:44 UTCJun 22, 18:09 UTC25m
2026-06-22 AAH443 KOA → HNL Jun 22, 16:14 UTCJun 22, 16:50 UTC35m
2026-06-22 AAH443 - Jun 22, 15:10 UTCJun 22, 15:35 UTC25m
2026-06-21 AAH41 KOA → HNL Jun 21, 16:25 UTCJun 21, 16:54 UTC30m
2026-06-21 AAH40 HNL → KOA Jun 21, 15:30 UTCJun 21, 15:54 UTC25m
2026-06-21 AAH11 - Jun 21, 13:04 UTCJun 21, 13:15 UTC10m
2026-06-20 AAH16 - Jun 20, 16:24 UTCJun 20, 16:44 UTC20m
2026-06-20 AAH15 - Jun 20, 13:34 UTCJun 20, 13:44 UTC10m
2026-06-19 AAH18 - Jun 19, 17:14 UTCJun 19, 17:24 UTC10m
2026-06-19 AAH17 - Jun 19, 16:09 UTCJun 19, 16:19 UTC10m
2026-06-19 AAH16 - Jun 19, 14:54 UTCJun 19, 15:04 UTC10m
2026-06-19 AAH15 - Jun 19, 13:39 UTCJun 19, 13:50 UTC10m
2026-06-19 AAH11 - Jun 19, 07:49 UTCJun 19, 07:59 UTC10m
2026-06-19 AAH43 - Jun 19, 05:24 UTCJun 19, 05:59 UTC35m
2026-06-19 AAH42 - Jun 19, 03:29 UTCJun 19, 03:55 UTC25m
2026-06-18 AAH443 KOA → HNL Jun 18, 16:35 UTCJun 18, 17:00 UTC25m
2026-06-18 AAH442 - Jun 18, 15:25 UTCJun 18, 15:50 UTC25m

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 N405YK page for operator, model, and routing details .

Mode-S A4C164 frequently asked

What is Mode-S code A4C164?
A4C164 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N405YK.
Where is Mode-S A4C164 registered?
Mode-S code A4C164 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 A4C164 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 A4C164, octal 51140544, decimal 10,797,412.
What flights does A4C164 operate?
Mode-S A4C164 has broadcast 20 distinct callsigns, including AAH443, AAH442, AAH445, AAH444, AAH57.