Apparatus

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sensors Mode-S transponder

A645F2

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N503JW · AGUSTA AW-189 · operated by ERA HELICOPTERS LLC

Hex
A645F2
Octal
51442762
Decimal
10,896,882
Country
US
Tail
N503JW
Type
A189
No current signal · last broadcast 1d ago
Flights observed
119
Distinct callsigns
1
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A645F2.

Country allocation

The ICAO 24-bit address A645F2 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
BTZ503 - 119 2026-07-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-16 BTZ503 - Jul 16, 11:34 UTCJul 16, 12:05 UTC30m
2026-07-13 BTZ503 - Jul 13, 17:40 UTCJul 13, 17:55 UTC15m
2026-07-13 BTZ503 - Jul 13, 15:35 UTCJul 13, 16:00 UTC25m
2026-07-13 BTZ503 - Jul 13, 11:40 UTCJul 13, 11:55 UTC15m
2026-07-09 BTZ503 - Jul 9, 17:55 UTCJul 9, 18:05 UTC10m
2026-07-09 BTZ503 - Jul 9, 12:30 UTCJul 9, 12:45 UTC15m
2026-07-07 BTZ503 - Jul 7, 18:05 UTCJul 7, 18:15 UTC10m
2026-07-07 BTZ503 - Jul 7, 16:05 UTCJul 7, 16:20 UTC15m
2026-07-07 BTZ503 - Jul 7, 11:45 UTCJul 7, 12:10 UTC25m
2026-07-04 BTZ503 - Jul 4, 13:15 UTCJul 4, 13:25 UTC10m
2026-07-04 BTZ503 - Jul 4, 11:15 UTCJul 4, 11:35 UTC20m
2026-07-01 BTZ503 - Jul 1, 19:55 UTCJul 1, 20:05 UTC10m
2026-07-01 BTZ503 - Jul 1, 18:05 UTCJul 1, 18:20 UTC15m
2026-07-01 BTZ503 - Jul 1, 13:30 UTCJul 1, 13:45 UTC15m
2026-07-01 BTZ503 - Jul 1, 11:15 UTCJul 1, 11:35 UTC20m
2026-06-30 BTZ503 - Jun 30, 11:15 UTCJun 30, 11:40 UTC25m
2026-06-23 BTZ503 - Jun 23, 17:34 UTCJun 23, 17:44 UTC10m
2026-06-23 BTZ503 - Jun 23, 15:19 UTCJun 23, 15:50 UTC30m
2026-06-23 BTZ503 - Jun 23, 12:20 UTCJun 23, 13:15 UTC55m
2026-06-22 BTZ503 - Jun 22, 15:40 UTCJun 22, 15:50 UTC10m
2026-06-22 BTZ503 - Jun 22, 13:59 UTCJun 22, 14:10 UTC10m
2026-06-22 BTZ503 - Jun 22, 11:19 UTCJun 22, 12:00 UTC40m
2026-06-19 BTZ503 - Jun 19, 11:39 UTCJun 19, 12:04 UTC25m
2026-06-18 BTZ503 - Jun 18, 17:25 UTCJun 18, 17:35 UTC10m
2026-06-18 BTZ503 - Jun 18, 15:25 UTCJun 18, 15:55 UTC30m
2026-06-18 BTZ503 - Jun 18, 12:15 UTCJun 18, 12:40 UTC25m
2026-06-17 BTZ503 - Jun 17, 15:00 UTCJun 17, 15:15 UTC15m
2026-06-17 BTZ503 - Jun 17, 13:25 UTCJun 17, 13:40 UTC15m
2026-06-17 BTZ503 - Jun 17, 11:15 UTCJun 17, 11:35 UTC20m
2026-06-16 BTZ503 - Jun 16, 16:30 UTCJun 16, 16:39 UTC10m
2026-06-16 BTZ503 - Jun 16, 12:39 UTCJun 16, 12:55 UTC15m
2026-06-12 BTZ503 - Jun 12, 15:10 UTCJun 12, 15:35 UTC25m
2026-06-12 BTZ503 - Jun 12, 12:20 UTCJun 12, 12:50 UTC30m
2026-06-11 BTZ503 - Jun 11, 15:15 UTCJun 11, 15:40 UTC25m
2026-06-11 BTZ503 - Jun 11, 12:10 UTCJun 11, 14:20 UTC2h 10m
2026-06-10 BTZ503 - Jun 10, 17:10 UTCJun 10, 17:20 UTC10m
2026-06-10 BTZ503 - Jun 10, 14:30 UTCJun 10, 14:40 UTC10m
2026-06-10 BTZ503 - Jun 10, 12:25 UTCJun 10, 12:55 UTC30m
2026-06-09 BTZ503 - Jun 9, 12:00 UTCJun 9, 12:15 UTC15m
2026-06-08 BTZ503 - Jun 8, 11:40 UTCJun 8, 12:00 UTC20m
2026-06-07 BTZ503 - Jun 7, 14:20 UTCJun 7, 14:30 UTC10m
2026-06-07 BTZ503 - Jun 7, 12:20 UTCJun 7, 12:55 UTC35m
2026-06-05 BTZ503 - Jun 5, 14:25 UTCJun 5, 15:05 UTC40m
2026-06-05 BTZ503 - Jun 5, 11:10 UTCJun 5, 11:35 UTC25m
2026-06-04 BTZ503 - Jun 4, 13:10 UTCJun 4, 13:20 UTC10m
2026-06-02 BTZ503 - Jun 2, 17:05 UTCJun 2, 17:15 UTC10m
2026-06-02 BTZ503 - Jun 2, 15:00 UTCJun 2, 15:15 UTC15m
2026-06-01 BTZ503 - Jun 1, 16:10 UTCJun 1, 16:20 UTC10m
2026-06-01 BTZ503 - Jun 1, 11:10 UTCJun 1, 11:30 UTC20m
2026-05-31 BTZ503 - May 31, 15:40 UTCMay 31, 15:55 UTC15m

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 N503JW page for operator, model, and routing details .

Mode-S A645F2 frequently asked

What is Mode-S code A645F2?
A645F2 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N503JW.
Where is Mode-S A645F2 registered?
Mode-S code A645F2 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 A645F2 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 A645F2, octal 51442762, decimal 10,896,882.
What flights does A645F2 operate?
Mode-S A645F2 has broadcast 1 distinct callsign, including BTZ503.