Apparatus

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sensors Mode-S transponder

A4F037

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N417XJ · SAAB 340 · operated by BANK OF UTAH TRUSTEE

Hex
A4F037
Octal
51170067
Decimal
10,809,399
Country
US
Tail
N417XJ
Type
SF34
No current signal · last broadcast 2d ago
Flights observed
255
Distinct callsigns
20
Country
US
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S A4F037.

Country allocation

The ICAO 24-bit address A4F037 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
EZR683 - 36 2026-07-08
EZR674 Z-Air 26 2026-07-09
EZR680 - 21 2026-07-08
EZR700 Z-Air 20 2026-07-11
EZR672 Z-Air 18 2026-07-10
EZR701 - 16 2026-07-11
EZR675 Z-Air 15 2026-07-08
EZR676 Z-Air 14 2026-07-07
EZR677 Z-Air 12 2026-07-09
EZR673 Z-Air 11 2026-06-26
EZR670 - 11 2026-07-06
EZR591 Z-Air 11 2026-07-10
EZR590 Z-Air 9 2026-07-10
EZR600 Z-Air 6 2026-07-04
EZR685 Z-Air 4 2026-06-17
EZR601 Z-Air 4 2026-07-02
EZR682 Z-Air 3 2026-06-21
EZR6740 - 3 2026-05-19
EZR703 - 2 2026-06-20
EZR702 - 2 2026-06-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-11 EZR701 - Jul 11, 20:00 UTCJul 11, 20:10 UTC10m
2026-07-11 EZR701 - Jul 11, 18:40 UTCJul 11, 18:55 UTC15m
2026-07-11 EZR700 AUA → EUX Jul 11, 13:25 UTCJul 11, 13:40 UTC15m
2026-07-11 EZR700 AUA → EUX Jul 11, 12:20 UTCJul 11, 12:35 UTC15m
2026-07-10 EZR591 BAQ → CUR Jul 10, 18:40 UTCJul 10, 19:15 UTC35m
2026-07-10 EZR590 CUR → BAQ Jul 10, 15:15 UTCJul 10, 15:50 UTC35m
2026-07-10 EZR672 CUR → AUA Jul 10, 12:50 UTCJul 10, 13:50 UTC1h 0m
2026-07-09 EZR677 CUR → BON Jul 9, 17:00 UTCJul 9, 17:10 UTC10m
2026-07-09 EZR674 BON → CUR Jul 9, 12:45 UTCJul 9, 13:40 UTC55m
2026-07-08 EZR683 - Jul 8, 22:25 UTCJul 8, 22:40 UTC15m
2026-07-08 EZR680 - Jul 8, 21:40 UTCJul 8, 21:50 UTC10m
2026-07-08 EZR675 AUA → CUR Jul 8, 13:45 UTCJul 8, 13:55 UTC10m
2026-07-08 EZR672 CUR → AUA Jul 8, 13:00 UTCJul 8, 13:10 UTC10m
2026-07-07 EZR677 CUR → BON Jul 7, 17:15 UTCJul 7, 17:25 UTC10m
2026-07-07 EZR676 CUR → AUA Jul 7, 16:15 UTCJul 7, 16:30 UTC15m
2026-07-07 EZR674 BON → CUR Jul 7, 13:40 UTCJul 7, 14:00 UTC20m
2026-07-07 EZR674 BON → CUR Jul 7, 12:55 UTCJul 7, 13:10 UTC15m
2026-07-06 EZR670 - Jul 6, 11:10 UTCJul 6, 12:05 UTC55m
2026-07-05 EZR683 - Jul 5, 22:05 UTCJul 5, 22:15 UTC10m
2026-07-05 EZR680 - Jul 5, 21:20 UTCJul 5, 21:35 UTC15m
2026-07-04 EZR701 - Jul 4, 20:40 UTCJul 4, 20:55 UTC15m
2026-07-04 EZR701 - Jul 4, 19:45 UTCJul 4, 20:00 UTC15m
2026-07-04 EZR600 CUR → AUA Jul 4, 13:50 UTCJul 4, 14:05 UTC15m
2026-07-04 EZR600 CUR → AUA Jul 4, 12:25 UTCJul 4, 12:40 UTC15m
2026-07-03 EZR591 BAQ → CUR Jul 3, 18:50 UTCJul 3, 19:15 UTC25m
2026-07-03 EZR590 CUR → BAQ Jul 3, 15:20 UTCJul 3, 15:55 UTC35m
2026-07-03 EZR670 - Jul 3, 11:00 UTCJul 3, 12:00 UTC1h 0m
2026-07-02 EZR683 - Jul 2, 23:45 UTCJul 3, 00:45 UTC1h 0m
2026-07-02 EZR601 CUR → BON Jul 2, 19:50 UTCJul 2, 20:05 UTC15m
2026-07-02 EZR600 CUR → AUA Jul 2, 11:10 UTCJul 2, 11:25 UTC15m
2026-07-01 EZR675 AUA → CUR Jul 1, 13:55 UTCJul 1, 14:10 UTC15m
2026-07-01 EZR672 CUR → AUA Jul 1, 13:05 UTCJul 1, 13:20 UTC15m
2026-07-01 EZR683 - Jul 1, 00:50 UTCJul 1, 01:05 UTC15m
2026-07-01 EZR683 - Jul 1, 00:00 UTCJul 1, 00:15 UTC15m
2026-06-30 EZR701 - Jun 30, 19:45 UTCJun 30, 19:55 UTC10m
2026-06-30 EZR701 - Jun 30, 18:20 UTCJun 30, 18:40 UTC20m
2026-06-30 EZR700 AUA → EUX Jun 30, 13:30 UTCJun 30, 13:50 UTC20m
2026-06-30 EZR700 AUA → EUX Jun 30, 12:20 UTCJun 30, 12:35 UTC15m
2026-06-29 EZR591 BAQ → CUR Jun 29, 19:15 UTCJun 29, 19:35 UTC20m
2026-06-29 EZR590 CUR → BAQ Jun 29, 15:09 UTCJun 29, 15:34 UTC25m
2026-06-29 EZR675 AUA → CUR Jun 29, 13:49 UTCJun 29, 14:04 UTC15m
2026-06-29 EZR672 CUR → AUA Jun 29, 12:55 UTCJun 29, 13:04 UTC10m
2026-06-28 EZR683 - Jun 28, 22:45 UTCJun 28, 22:55 UTC10m
2026-06-28 EZR680 - Jun 28, 21:30 UTCJun 28, 21:40 UTC10m
2026-06-26 EZR683 - Jun 26, 21:39 UTCJun 26, 22:40 UTC1h 0m
2026-06-26 EZR673 CUR → BON Jun 26, 11:55 UTCJun 26, 12:05 UTC10m
2026-06-26 EZR670 - Jun 26, 11:14 UTCJun 26, 11:24 UTC10m
2026-06-25 EZR677 CUR → BON Jun 25, 17:09 UTCJun 25, 17:25 UTC15m
2026-06-25 EZR676 CUR → AUA Jun 25, 16:09 UTCJun 25, 16:20 UTC10m
2026-06-25 EZR674 BON → CUR Jun 25, 13:45 UTCJun 25, 14:04 UTC20m

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 N417XJ page for operator, model, and routing details .

Mode-S A4F037 frequently asked

What is Mode-S code A4F037?
A4F037 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N417XJ.
Where is Mode-S A4F037 registered?
Mode-S code A4F037 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 A4F037 broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4F037, octal 51170067, decimal 10,809,399.
What flights does A4F037 operate?
Mode-S A4F037 has broadcast 20 distinct callsigns, including EZR683, EZR674, EZR680, EZR700, EZR672.