Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A4E5F6

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N4144X · PIPER PA-28-140/150/160/180 · operated by SKYWEST LEASING INC

Hex
A4E5F6
Octal
51162766
Decimal
10,806,774
Country
US
Tail
N4144X
Type
P28A
No current signal · last broadcast 59m ago
Flights observed
125
Distinct callsigns
1
Country
US
Last broadcast
59m ago

Last known position

Most recent position reported by Mode-S A4E5F6.

Country allocation

The ICAO 24-bit address A4E5F6 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
ASI553 - 125 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 ASI553 DVT → DVT Jul 14, 13:25 UTCJul 14, 14:50 UTC1h 25m
2026-07-13 ASI553 DVT → DVT Jul 13, 22:55 UTCJul 14, 00:40 UTC1h 45m
2026-07-13 ASI553 - Jul 13, 17:10 UTCJul 13, 18:45 UTC1h 35m
2026-07-13 ASI553 DVT → DVT Jul 13, 13:25 UTCJul 13, 14:50 UTC1h 25m
2026-07-11 ASI553 DVT → DVT Jul 11, 23:25 UTCJul 12, 02:10 UTC2h 45m
2026-07-11 ASI553 DVT → DVT Jul 11, 17:30 UTCJul 11, 18:05 UTC35m
2026-07-10 ASI553 DVT → DVT Jul 10, 13:10 UTCJul 10, 15:00 UTC1h 50m
2026-07-09 ASI553 DVT → DVT Jul 9, 20:35 UTCJul 9, 22:00 UTC1h 25m
2026-07-08 ASI553 - Jul 8, 18:20 UTCJul 8, 19:25 UTC1h 5m
2026-07-08 ASI553 - Jul 8, 14:35 UTCJul 8, 17:05 UTC2h 30m
2026-07-07 ASI553 - Jul 7, 18:30 UTCJul 7, 20:10 UTC1h 40m
2026-07-07 ASI553 DVT → DVT Jul 7, 13:35 UTCJul 7, 14:30 UTC55m
2026-07-05 ASI553 - Jul 5, 17:40 UTCJul 5, 19:30 UTC1h 50m
2026-07-05 ASI553 DVT → DVT Jul 5, 16:05 UTCJul 5, 16:55 UTC50m
2026-07-04 ASI553 DVT → DVT Jul 4, 12:55 UTCJul 4, 14:40 UTC1h 45m
2026-07-04 ASI553 - Jul 4, 04:15 UTCJul 4, 05:30 UTC1h 15m
2026-07-03 ASI553 - Jul 3, 17:15 UTCJul 3, 19:45 UTC2h 30m
2026-07-03 ASI553 DVT → DVT Jul 3, 12:45 UTCJul 3, 14:30 UTC1h 45m
2026-07-03 ASI553 - Jul 3, 04:25 UTCJul 3, 07:20 UTC2h 55m
2026-07-02 ASI553 - Jul 2, 18:40 UTCJul 2, 20:30 UTC1h 50m
2026-07-02 ASI553 - Jul 2, 16:15 UTCJul 2, 17:20 UTC1h 5m
2026-07-01 ASI553 DVT → DVT Jul 1, 21:30 UTCJul 1, 22:25 UTC55m
2026-07-01 ASI553 - Jul 1, 17:00 UTCJul 1, 18:45 UTC1h 45m
2026-07-01 ASI553 - Jul 1, 15:55 UTCJul 1, 16:10 UTC15m
2026-07-01 ASI553 - Jul 1, 13:05 UTCJul 1, 15:00 UTC1h 55m
2026-07-01 ASI553 DVT → DVT Jul 1, 01:10 UTCJul 1, 03:25 UTC2h 15m
2026-06-30 ASI553 - Jun 30, 18:10 UTCJun 30, 19:15 UTC1h 5m
2026-06-30 ASI553 - Jun 30, 13:20 UTCJun 30, 17:00 UTC3h 40m
2026-06-30 ASI553 - Jun 30, 11:35 UTCJun 30, 11:45 UTC10m
2026-06-29 ASI553 DVT → DVT Jun 29, 05:15 UTCJun 29, 07:20 UTC2h 5m
2026-06-28 ASI553 - Jun 28, 23:39 UTCJun 29, 02:35 UTC2h 55m
2026-06-28 ASI553 DVT → DVT Jun 28, 21:14 UTCJun 28, 22:15 UTC1h 0m
2026-06-28 ASI553 DVT → DVT Jun 28, 16:49 UTCJun 28, 18:10 UTC1h 20m
2026-06-28 ASI553 DVT → DVT Jun 28, 03:50 UTCJun 28, 05:04 UTC1h 15m
2026-06-28 ASI553 DVT → DVT Jun 28, 01:10 UTCJun 28, 02:20 UTC1h 10m
2026-06-27 ASI553 DVT → DVT Jun 27, 16:49 UTCJun 27, 17:39 UTC50m
2026-06-27 ASI553 DVT → DVT Jun 27, 13:20 UTCJun 27, 14:45 UTC1h 25m
2026-06-26 ASI553 - Jun 26, 16:00 UTCJun 26, 17:15 UTC1h 15m
2026-06-26 ASI553 - Jun 26, 13:15 UTCJun 26, 14:35 UTC1h 20m
2026-06-25 ASI553 - Jun 25, 16:20 UTCJun 25, 17:20 UTC1h 0m
2026-06-25 ASI553 - Jun 25, 13:50 UTCJun 25, 15:29 UTC1h 40m
2026-06-25 ASI553 DVT → DVT Jun 25, 04:14 UTCJun 25, 05:05 UTC50m
2026-06-25 ASI553 DVT → DVT Jun 25, 03:50 UTCJun 25, 04:10 UTC20m
2026-06-24 ASI553 DVT → DVT Jun 24, 16:45 UTCJun 24, 18:20 UTC1h 35m
2026-06-24 ASI553 - Jun 24, 14:20 UTCJun 24, 15:24 UTC1h 5m
2026-06-23 ASI553 - Jun 23, 17:30 UTCJun 23, 18:10 UTC40m
2026-06-23 ASI553 - Jun 23, 14:59 UTCJun 23, 16:44 UTC1h 45m
2026-06-23 ASI553 DVT → DVT Jun 23, 00:19 UTCJun 23, 01:40 UTC1h 20m
2026-06-22 ASI553 DVT → DVT Jun 22, 14:49 UTCJun 22, 16:20 UTC1h 30m
2026-06-21 ASI553 HII → DVT Jun 21, 17:54 UTCJun 21, 19:24 UTC1h 30m

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 N4144X page for operator, model, and routing details .

Mode-S A4E5F6 frequently asked

What is Mode-S code A4E5F6?
A4E5F6 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N4144X.
Where is Mode-S A4E5F6 registered?
Mode-S code A4E5F6 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 A4E5F6 broadcasting right now?
No active broadcast right now. Last signal was 59m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4E5F6, octal 51162766, decimal 10,806,774.
What flights does A4E5F6 operate?
Mode-S A4E5F6 has broadcast 1 distinct callsign, including ASI553.