Apparatus

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sensors Mode-S transponder

A20E71

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N231YV · BEECH 1900 · operated by ALPINE AVIATION INC

Hex
A20E71
Octal
50407161
Decimal
10,620,529
Country
US
Tail
N231YV
Type
B190
No current signal · last broadcast Jul 25, 23:40 UTC
Flights observed
119
Distinct callsigns
16
Country
US
Last broadcast
Jul 25, 23:40 UTC

Last known position

Most recent position reported by Mode-S A20E71.

Country allocation

The ICAO 24-bit address A20E71 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 16 distinct

Callsign Airline Flights Last seen
AIP1814 Alpine Air Express 47 2026-06-06
AIP1813 Alpine Air Express 44 2026-06-06
AIP1604 - 6 2026-07-24
AIP1603 - 6 2026-07-24
AIP9931 - 2 2026-07-07
AIP9921 Alpine Air Express 2 2026-06-22
AIP8950 - 2 2026-07-02
AIP1044 Alpine Air Express 2 2026-07-20
AIP9900 Alpine Air Express 1 2026-07-02
AIP624 - 1 2026-07-03
AIP623 - 1 2026-07-04
AIP17 Alpine Air Express 1 2026-05-22
AIP1600 Alpine Air Express 1 2026-05-07
AIP1595 - 1 2026-06-26
AIP1587 Alpine Air Express 1 2026-07-21
AIP1541 Alpine Air Express 1 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 AIP1541 BIS → FAR Jul 25, 22:45 UTCJul 25, 23:40 UTC55m
2026-07-24 AIP1604 - Jul 24, 14:00 UTCJul 24, 14:50 UTC50m
2026-07-24 AIP1603 - Jul 24, 11:40 UTCJul 24, 12:40 UTC1h 0m
2026-07-22 AIP1604 - Jul 22, 14:20 UTCJul 22, 15:05 UTC45m
2026-07-22 AIP1603 - Jul 22, 11:50 UTCJul 22, 12:55 UTC1h 5m
2026-07-21 AIP1604 - Jul 21, 14:00 UTCJul 21, 14:40 UTC40m
2026-07-21 AIP1603 - Jul 21, 11:45 UTCJul 21, 12:50 UTC1h 5m
2026-07-21 AIP1587 RAP → FSD Jul 21, 00:55 UTCJul 21, 01:35 UTC40m
2026-07-20 AIP1044 FSD → RAP Jul 20, 22:10 UTCJul 20, 23:15 UTC1h 5m
2026-07-16 AIP1604 - Jul 16, 14:15 UTCJul 16, 15:10 UTC55m
2026-07-16 AIP1603 - Jul 16, 11:45 UTCJul 16, 12:40 UTC55m
2026-07-07 AIP9931 - Jul 7, 16:10 UTCJul 7, 17:40 UTC1h 30m
2026-07-07 AIP9931 - Jul 7, 15:00 UTCJul 7, 15:15 UTC15m
2026-07-04 AIP623 - Jul 4, 00:35 UTCJul 4, 01:20 UTC45m
2026-07-03 AIP624 - Jul 3, 13:30 UTCJul 3, 14:05 UTC35m
2026-07-02 AIP8950 - Jul 2, 14:10 UTCJul 2, 14:40 UTC30m
2026-07-02 AIP8950 - Jul 2, 11:15 UTCJul 2, 11:50 UTC35m
2026-07-02 AIP9900 HLN → BIL Jul 2, 02:40 UTCJul 2, 03:10 UTC30m
2026-06-26 AIP1595 - Jun 26, 12:24 UTCJun 26, 12:34 UTC10m
2026-06-22 AIP9921 CYS → DEN Jun 22, 19:14 UTCJun 22, 21:05 UTC1h 50m
2026-06-06 AIP9921 CYS → DEN Jun 6, 15:19 UTCJun 6, 16:10 UTC50m
2026-06-06 AIP1814 DEN → DRO Jun 6, 14:04 UTCJun 6, 14:30 UTC25m
2026-06-06 AIP1814 DEN → DRO Jun 6, 13:15 UTCJun 6, 13:39 UTC25m
2026-06-06 AIP1813 GUC → DEN Jun 6, 01:30 UTCJun 6, 02:05 UTC35m
2026-06-05 AIP1814 DEN → DRO Jun 5, 12:55 UTCJun 5, 13:30 UTC35m
2026-06-05 AIP1813 GUC → DEN Jun 5, 02:00 UTCJun 5, 02:30 UTC30m
2026-06-04 AIP1814 DEN → DRO Jun 4, 12:45 UTCJun 4, 13:25 UTC40m
2026-06-04 AIP1813 GUC → DEN Jun 4, 02:00 UTCJun 4, 02:40 UTC40m
2026-06-04 AIP1813 GUC → DEN Jun 4, 01:05 UTCJun 4, 01:20 UTC15m
2026-06-03 AIP1814 DEN → DRO Jun 3, 12:50 UTCJun 3, 13:45 UTC55m
2026-06-03 AIP1813 GUC → DEN Jun 3, 01:40 UTCJun 3, 02:10 UTC30m
2026-06-02 AIP1814 DEN → DRO Jun 2, 12:45 UTCJun 2, 13:25 UTC40m
2026-06-02 AIP1813 GUC → DEN Jun 2, 02:10 UTCJun 2, 02:45 UTC35m
2026-06-01 AIP1814 DEN → DRO Jun 1, 23:20 UTCJun 2, 00:00 UTC40m
2026-05-30 AIP1813 GUC → DEN May 30, 15:25 UTCMay 30, 16:10 UTC45m
2026-05-30 AIP1814 DEN → DRO May 30, 14:05 UTCMay 30, 14:30 UTC25m
2026-05-30 AIP1814 DEN → DRO May 30, 13:20 UTCMay 30, 13:45 UTC25m
2026-05-30 AIP1813 GUC → DEN May 30, 02:00 UTCMay 30, 02:25 UTC25m
2026-05-29 AIP1814 DEN → DRO May 29, 12:50 UTCMay 29, 13:45 UTC55m
2026-05-29 AIP1813 GUC → DEN May 29, 01:40 UTCMay 29, 02:10 UTC30m
2026-05-28 AIP1814 DEN → DRO May 28, 13:35 UTCMay 28, 14:10 UTC35m
2026-05-28 AIP1813 GUC → DEN May 28, 01:30 UTCMay 28, 02:10 UTC40m
2026-05-27 AIP1814 DEN → DRO May 27, 13:05 UTCMay 27, 13:45 UTC40m
2026-05-27 AIP1813 GUC → DEN May 27, 01:29 UTCMay 27, 02:04 UTC35m
2026-05-26 AIP1814 DEN → DRO May 26, 22:44 UTCMay 26, 23:19 UTC35m
2026-05-23 AIP1813 GUC → DEN May 23, 15:25 UTCMay 23, 16:25 UTC1h 0m
2026-05-23 AIP1814 DEN → DRO May 23, 13:35 UTCMay 23, 14:20 UTC45m
2026-05-23 AIP1814 DEN → DRO May 23, 13:00 UTCMay 23, 13:20 UTC20m
2026-05-23 AIP1813 GUC → DEN May 23, 01:30 UTCMay 23, 02:05 UTC35m
2026-05-22 AIP1814 DEN → DRO May 22, 12:50 UTCMay 22, 13:25 UTC35m

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 N231YV page for operator, model, and routing details .

Mode-S A20E71 frequently asked

What is Mode-S code A20E71?
A20E71 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N231YV.
Where is Mode-S A20E71 registered?
Mode-S code A20E71 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 A20E71 broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 23:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A20E71, octal 50407161, decimal 10,620,529.
What flights does A20E71 operate?
Mode-S A20E71 has broadcast 16 distinct callsigns, including AIP1814, AIP1813, AIP1604, AIP1603, AIP9931.