Apparatus

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sensors Mode-S transponder

A1E674

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N221TU · operated by MERIDIAN AIRCRAFT LLC

Hex
A1E674
Octal
50363164
Decimal
10,610,292
Country
US
Tail
N221TU
Type
P28A
No current signal · last broadcast 11h ago
Flights observed
137
Distinct callsigns
1
Country
US
Last broadcast
11h ago

Last known position

Most recent position reported by Mode-S A1E674.

Country allocation

The ICAO 24-bit address A1E674 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
CXK273 - 137 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 CXK273 - Jul 17, 09:30 UTCJul 17, 11:35 UTC2h 5m
2026-07-14 CXK273 - Jul 14, 14:10 UTCJul 14, 15:40 UTC1h 30m
2026-07-14 CXK273 - Jul 14, 12:50 UTCJul 14, 13:20 UTC30m
2026-07-11 CXK273 - Jul 11, 23:25 UTCJul 12, 00:45 UTC1h 20m
2026-07-11 CXK273 - Jul 11, 14:30 UTCJul 11, 15:30 UTC1h 0m
2026-07-10 CXK273 PNE → PNE Jul 10, 18:20 UTCJul 10, 19:35 UTC1h 15m
2026-07-10 CXK273 PNE → PNE Jul 10, 16:20 UTCJul 10, 17:00 UTC40m
2026-07-10 CXK273 - Jul 10, 12:40 UTCJul 10, 14:40 UTC2h 0m
2026-07-07 CXK273 PNE → PNE Jul 7, 20:50 UTCJul 7, 22:15 UTC1h 25m
2026-07-02 CXK273 - Jul 2, 13:40 UTCJul 2, 15:10 UTC1h 30m
2026-07-02 CXK273 PNE → PNE Jul 2, 09:40 UTCJul 2, 11:00 UTC1h 20m
2026-06-30 CXK273 - Jun 30, 17:55 UTCJun 30, 19:00 UTC1h 5m
2026-06-30 CXK273 PNE → PNE Jun 30, 13:00 UTCJun 30, 13:40 UTC40m
2026-06-30 CXK273 PNE → PNE Jun 30, 10:15 UTCJun 30, 11:10 UTC55m
2026-06-26 CXK273 - Jun 26, 16:39 UTCJun 26, 17:59 UTC1h 20m
2026-06-26 CXK273 - Jun 26, 13:49 UTCJun 26, 15:05 UTC1h 15m
2026-06-25 CXK273 PNE → PNE Jun 25, 15:15 UTCJun 25, 16:35 UTC1h 20m
2026-06-25 CXK273 - Jun 25, 12:15 UTCJun 25, 12:35 UTC20m
2026-06-24 CXK273 PNE → PNE Jun 24, 19:49 UTCJun 24, 21:29 UTC1h 40m
2026-06-24 CXK273 - Jun 24, 15:09 UTCJun 24, 15:59 UTC50m
2026-06-24 CXK273 - Jun 24, 11:54 UTCJun 24, 13:14 UTC1h 20m
2026-06-24 CXK273 - Jun 24, 09:15 UTCJun 24, 10:35 UTC1h 20m
2026-06-21 CXK273 PNE → PNE Jun 21, 14:54 UTCJun 21, 16:25 UTC1h 30m
2026-06-21 CXK273 PNE → PNE Jun 21, 12:55 UTCJun 21, 13:34 UTC40m
2026-06-21 CXK273 - Jun 21, 09:55 UTCJun 21, 11:05 UTC1h 10m
2026-06-20 CXK273 - Jun 20, 13:04 UTCJun 20, 14:09 UTC1h 5m
2026-06-19 CXK273 - Jun 19, 16:59 UTCJun 19, 19:04 UTC2h 5m
2026-06-19 CXK273 - Jun 19, 15:09 UTCJun 19, 15:49 UTC40m
2026-06-19 CXK273 - Jun 19, 12:54 UTCJun 19, 13:39 UTC45m
2026-06-19 CXK273 - Jun 19, 11:30 UTCJun 19, 11:54 UTC25m
2026-06-19 CXK273 - Jun 19, 09:40 UTCJun 19, 10:44 UTC1h 5m
2026-06-17 CXK273 - Jun 17, 15:46 UTCJun 17, 16:30 UTC45m
2026-06-17 CXK273 PNE → LNS Jun 17, 13:55 UTCJun 17, 15:40 UTC1h 45m
2026-06-17 CXK273 - Jun 17, 12:30 UTCJun 17, 12:55 UTC25m
2026-06-16 CXK273 - Jun 16, 19:45 UTCJun 16, 20:50 UTC1h 6m
2026-06-16 CXK273 - Jun 16, 14:50 UTCJun 16, 15:50 UTC1h 0m
2026-06-16 CXK273 - Jun 16, 12:35 UTCJun 16, 13:15 UTC40m
2026-06-16 CXK273 - Jun 16, 11:10 UTCJun 16, 12:25 UTC1h 15m
2026-06-16 CXK273 - Jun 16, 09:00 UTCJun 16, 10:20 UTC1h 20m
2026-06-05 CXK273 - Jun 5, 15:00 UTCJun 5, 16:20 UTC1h 20m
2026-06-05 CXK273 - Jun 5, 12:00 UTCJun 5, 13:00 UTC1h 0m
2026-06-04 CXK273 - Jun 4, 20:35 UTCJun 4, 22:35 UTC2h 0m
2026-06-03 CXK273 PNE → PNE Jun 3, 14:45 UTCJun 3, 16:15 UTC1h 30m
2026-06-03 CXK273 PNE → PNE Jun 3, 12:10 UTCJun 3, 13:30 UTC1h 20m
2026-06-02 CXK273 - Jun 2, 21:05 UTCJun 2, 22:30 UTC1h 25m
2026-06-02 CXK273 - Jun 2, 18:30 UTCJun 2, 20:05 UTC1h 35m
2026-06-02 CXK273 PNE → PNE Jun 2, 15:45 UTCJun 2, 17:05 UTC1h 20m
2026-06-01 CXK273 - Jun 1, 16:25 UTCJun 1, 16:55 UTC30m
2026-06-01 CXK273 - Jun 1, 14:55 UTCJun 1, 15:15 UTC20m
2026-06-01 CXK273 - Jun 1, 10:50 UTCJun 1, 12:25 UTC1h 35m

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 N221TU page for operator, model, and routing details .

Mode-S A1E674 frequently asked

What is Mode-S code A1E674?
A1E674 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N221TU.
Where is Mode-S A1E674 registered?
Mode-S code A1E674 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 A1E674 broadcasting right now?
No active broadcast right now. Last signal was 11h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1E674, octal 50363164, decimal 10,610,292.
What flights does A1E674 operate?
Mode-S A1E674 has broadcast 1 distinct callsign, including CXK273.