Apparatus

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sensors Mode-S transponder

A2645D

ICAO 24-bit transponder address · allocated to United States

Hex
A2645D
Octal
50462135
Decimal
10,642,525
Country
US
No current signal · last broadcast 12h ago
Flights observed
73
Distinct callsigns
1
Country
US
Last broadcast
12h ago

Last known position

Most recent position reported by Mode-S A2645D.

Country allocation

The ICAO 24-bit address A2645D 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
N253TS - 73 2026-06-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-02 N253TS DBQ → DBQ Jun 2, 17:35 UTCJun 2, 20:05 UTC2h 30m
2026-06-02 N253TS DBQ → DBQ Jun 2, 15:30 UTCJun 2, 16:25 UTC55m
2026-06-02 N253TS DBQ → DBQ Jun 2, 13:15 UTCJun 2, 13:50 UTC35m
2026-06-01 N253TS DBQ → DBQ Jun 1, 22:05 UTCJun 1, 23:20 UTC1h 15m
2026-06-01 N253TS - Jun 1, 20:15 UTCJun 1, 20:55 UTC40m
2026-06-01 N253TS - Jun 1, 18:15 UTCJun 1, 19:05 UTC50m
2026-06-01 N253TS CLI → CLI Jun 1, 16:35 UTCJun 1, 17:40 UTC1h 5m
2026-06-01 N253TS - Jun 1, 10:55 UTCJun 1, 12:25 UTC1h 30m
2026-05-31 N253TS - May 31, 00:00 UTCMay 31, 00:40 UTC40m
2026-05-30 N253TS - May 30, 18:40 UTCMay 30, 19:30 UTC50m
2026-05-29 N253TS DBQ → DBQ May 29, 19:10 UTCMay 29, 20:15 UTC1h 5m
2026-05-29 N253TS DBQ → DBQ May 29, 16:10 UTCMay 29, 16:45 UTC35m
2026-05-29 N253TS DBQ → DBQ May 29, 14:20 UTCMay 29, 15:00 UTC40m
2026-05-28 N253TS DBQ → DBQ May 28, 20:55 UTCMay 28, 21:55 UTC1h 0m
2026-05-28 N253TS DBQ → DBQ May 28, 18:40 UTCMay 28, 19:45 UTC1h 5m
2026-05-27 N253TS DBQ → DBQ May 27, 18:55 UTCMay 27, 22:10 UTC3h 15m
2026-05-27 N253TS DBQ → DBQ May 27, 15:20 UTCMay 27, 16:50 UTC1h 30m
2026-05-26 N253TS - May 26, 23:25 UTCMay 27, 00:30 UTC1h 5m
2026-05-26 N253TS - May 26, 21:49 UTCMay 26, 22:54 UTC1h 5m
2026-05-26 N253TS DBQ → DBQ May 26, 17:44 UTCMay 26, 19:05 UTC1h 20m
2026-05-26 N253TS DBQ → DBQ May 26, 15:54 UTCMay 26, 16:50 UTC55m
2026-05-21 N253TS DBQ → DBQ May 21, 19:05 UTCMay 21, 19:55 UTC50m
2026-05-21 N253TS - May 21, 16:35 UTCMay 21, 17:25 UTC50m
2026-05-21 N253TS - May 21, 14:15 UTCMay 21, 14:45 UTC30m
2026-05-21 N253TS - May 21, 13:50 UTCMay 21, 14:10 UTC20m
2026-05-20 N253TS - May 20, 18:55 UTCMay 20, 19:45 UTC50m
2026-05-20 N253TS - May 20, 17:30 UTCMay 20, 18:10 UTC40m
2026-05-20 N253TS - May 20, 13:45 UTCMay 20, 14:25 UTC40m
2026-05-15 N253TS DBQ → DBQ May 15, 16:40 UTCMay 15, 17:55 UTC1h 15m
2026-05-14 N253TS DBQ → DBQ May 14, 18:20 UTCMay 14, 19:15 UTC55m
2026-05-14 N253TS DBQ → DBQ May 14, 16:25 UTCMay 14, 17:25 UTC1h 0m
2026-05-14 N253TS DBQ → DBQ May 14, 13:40 UTCMay 14, 14:35 UTC55m
2026-05-13 N253TS DBQ → DBQ May 13, 23:10 UTCMay 13, 23:55 UTC45m
2026-05-13 N253TS DBQ → DBQ May 13, 16:15 UTCMay 13, 17:15 UTC1h 0m
2026-05-11 N253TS DBQ → DBQ May 11, 21:10 UTCMay 11, 22:15 UTC1h 5m
2026-05-11 N253TS DBQ → DBQ May 11, 18:25 UTCMay 11, 19:25 UTC1h 0m
2026-05-11 N253TS DBQ → DBQ May 11, 16:15 UTCMay 11, 17:30 UTC1h 16m
2026-05-11 N253TS DBQ → DBQ May 11, 14:10 UTCMay 11, 15:10 UTC1h 0m
2026-05-08 N253TS DBQ → DBQ May 8, 19:35 UTCMay 8, 20:35 UTC1h 0m
2026-05-08 N253TS DBQ → DBQ May 8, 17:50 UTCMay 8, 18:15 UTC25m
2026-05-08 N253TS DBQ → DBQ May 8, 15:45 UTCMay 8, 16:35 UTC50m
2026-05-08 N253TS DBQ → DBQ May 8, 13:45 UTCMay 8, 14:45 UTC1h 0m
2026-05-06 N253TS DBQ → DBQ May 6, 14:50 UTCMay 6, 15:20 UTC30m
2026-05-05 N253TS DBQ → DBQ May 5, 15:40 UTCMay 5, 16:25 UTC45m
2026-04-30 N253TS DBQ → DBQ Apr 30, 18:40 UTCApr 30, 19:25 UTC45m
2026-04-30 N253TS DBQ → DBQ Apr 30, 14:35 UTCApr 30, 16:15 UTC1h 40m
2026-04-25 N253TS - Apr 25, 01:35 UTCApr 25, 02:25 UTC50m
2026-04-25 N253TS - Apr 25, 00:25 UTCApr 25, 00:55 UTC30m
2026-04-24 N253TS - Apr 24, 19:00 UTCApr 24, 21:15 UTC2h 15m
2026-04-23 N253TS DBQ → DBQ Apr 23, 00:35 UTCApr 23, 01:00 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.

Mode-S A2645D frequently asked

What is Mode-S code A2645D?
A2645D is an ICAO 24-bit transponder address. Allocated to United States.
Where is Mode-S A2645D registered?
Mode-S code A2645D 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 A2645D broadcasting right now?
No active broadcast right now. Last signal was 12h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2645D, octal 50462135, decimal 10,642,525.
What flights does A2645D operate?
Mode-S A2645D has broadcast 1 distinct callsign, including N253TS.