Apparatus

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sensors Mode-S transponder

ADF475

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N999DZ · BEECH 99 Airliner · operated by ALPINE AVIATION INC

Hex
ADF475
Octal
53372165
Decimal
11,400,309
Country
US
Tail
N999DZ
Type
BE99
No current signal · last broadcast 6h ago
Flights observed
62
Distinct callsigns
11
Country
US
Last broadcast
6h ago

Last known position

Most recent position reported by Mode-S ADF475.

Country allocation

The ICAO 24-bit address ADF475 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 11 distinct

Callsign Airline Flights Last seen
AIP1802 Alpine Air Express 21 2026-06-02
AIP1801 Alpine Air Express 20 2026-05-29
AIP1822 Alpine Air Express 8 2026-05-23
AIP92 Alpine Air Express 3 2026-05-05
AIP542 Alpine Air Express 3 2026-05-26
AIP1800 - 2 2026-04-18
AIP27 Alpine Air Express 1 2026-05-05
AIP1846 Alpine Air Express 1 2026-04-17
AIP1845 Alpine Air Express 1 2026-04-17
AIP1844 Alpine Air Express 1 2026-04-28
AIP1843 Alpine Air Express 1 2026-04-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-02 AIP1802 SLC → ELY Jun 2, 13:25 UTCJun 2, 14:05 UTC40m
2026-05-29 AIP1801 WMC → ELY May 29, 22:45 UTCMay 29, 23:15 UTC30m
2026-05-29 AIP1802 SLC → ELY May 29, 13:10 UTCMay 29, 13:35 UTC25m
2026-05-28 AIP1801 WMC → ELY May 28, 23:15 UTCMay 28, 23:40 UTC25m
2026-05-28 AIP1802 SLC → ELY May 28, 14:00 UTCMay 28, 14:25 UTC25m
2026-05-27 AIP1801 WMC → ELY May 27, 23:15 UTCMay 27, 23:50 UTC35m
2026-05-27 AIP1802 SLC → ELY May 27, 13:20 UTCMay 27, 13:50 UTC30m
2026-05-26 AIP542 TUL → IAG May 26, 18:45 UTCMay 26, 19:20 UTC35m
2026-05-26 AIP542 TUL → IAG May 26, 17:30 UTCMay 26, 17:39 UTC10m
2026-05-26 AIP542 TUL → IAG May 26, 14:50 UTCMay 26, 15:14 UTC25m
2026-05-23 AIP1822 SLC → IDA May 23, 15:30 UTCMay 23, 16:00 UTC30m
2026-05-23 AIP1822 SLC → IDA May 23, 13:40 UTCMay 23, 14:20 UTC40m
2026-05-22 AIP1801 WMC → ELY May 22, 22:15 UTCMay 22, 22:40 UTC25m
2026-05-22 AIP1802 SLC → ELY May 22, 13:25 UTCMay 22, 13:55 UTC30m
2026-05-20 AIP1801 WMC → ELY May 20, 21:55 UTCMay 20, 22:20 UTC25m
2026-05-20 AIP1802 SLC → ELY May 20, 13:15 UTCMay 20, 13:45 UTC30m
2026-05-16 AIP1822 SLC → IDA May 16, 15:35 UTCMay 16, 16:10 UTC35m
2026-05-16 AIP1822 SLC → IDA May 16, 13:21 UTCMay 16, 13:55 UTC35m
2026-05-15 AIP1801 WMC → ELY May 15, 23:00 UTCMay 15, 23:30 UTC30m
2026-05-15 AIP1802 SLC → ELY May 15, 13:25 UTCMay 15, 14:00 UTC35m
2026-05-14 AIP1801 WMC → ELY May 14, 22:55 UTCMay 14, 23:20 UTC25m
2026-05-14 AIP1802 SLC → ELY May 14, 13:10 UTCMay 14, 13:40 UTC30m
2026-05-13 AIP1801 WMC → ELY May 13, 22:45 UTCMay 13, 23:15 UTC30m
2026-05-13 AIP1802 SLC → ELY May 13, 13:15 UTCMay 13, 13:45 UTC30m
2026-05-12 AIP1801 WMC → ELY May 12, 23:05 UTCMay 12, 23:35 UTC30m
2026-05-12 AIP1802 SLC → ELY May 12, 13:15 UTCMay 12, 13:51 UTC35m
2026-05-09 AIP1822 SLC → IDA May 9, 15:50 UTCMay 9, 16:20 UTC30m
2026-05-09 AIP1822 SLC → IDA May 9, 13:50 UTCMay 9, 14:25 UTC35m
2026-05-08 AIP1801 WMC → ELY May 8, 23:25 UTCMay 8, 23:50 UTC25m
2026-05-08 AIP1802 SLC → ELY May 8, 13:10 UTCMay 8, 13:45 UTC35m
2026-05-07 AIP1801 WMC → ELY May 7, 22:50 UTCMay 7, 23:14 UTC25m
2026-05-07 AIP1802 SLC → ELY May 7, 13:45 UTCMay 7, 14:15 UTC30m
2026-05-06 AIP1801 WMC → ELY May 6, 22:35 UTCMay 6, 23:00 UTC25m
2026-05-06 AIP1802 SLC → ELY May 6, 13:35 UTCMay 6, 14:10 UTC35m
2026-05-05 AIP92 SLC → IDA May 5, 20:01 UTCMay 5, 21:10 UTC1h 10m
2026-05-05 AIP92 SLC → IDA May 5, 18:35 UTCMay 5, 19:20 UTC45m
2026-05-05 AIP27 BIL → BTM May 5, 15:50 UTCMay 5, 17:20 UTC1h 30m
2026-05-04 AIP92 SLC → IDA May 4, 19:20 UTCMay 4, 20:45 UTC1h 25m
2026-05-02 AIP1822 SLC → IDA May 2, 14:55 UTCMay 2, 15:30 UTC35m
2026-05-02 AIP1822 SLC → IDA May 2, 13:05 UTCMay 2, 13:40 UTC35m
2026-05-01 AIP1801 WMC → ELY May 1, 22:00 UTCMay 1, 22:40 UTC40m
2026-05-01 AIP1802 SLC → ELY May 1, 13:20 UTCMay 1, 13:50 UTC30m
2026-04-29 AIP1801 WMC → ELY Apr 29, 22:45 UTCApr 29, 23:15 UTC29m
2026-04-29 AIP1802 SLC → ELY Apr 29, 13:20 UTCApr 29, 13:50 UTC30m
2026-04-29 AIP1843 PUC → SLC Apr 29, 00:59 UTCApr 29, 01:25 UTC25m
2026-04-28 AIP1844 SLC → VEL Apr 28, 14:40 UTCApr 28, 14:55 UTC15m
2026-04-22 AIP1801 WMC → ELY Apr 22, 22:10 UTCApr 22, 22:45 UTC35m
2026-04-22 AIP1802 SLC → ELY Apr 22, 13:50 UTCApr 22, 14:20 UTC30m
2026-04-21 AIP1801 WMC → ELY Apr 21, 22:45 UTCApr 21, 23:20 UTC35m
2026-04-21 AIP1802 SLC → ELY Apr 21, 13:30 UTCApr 21, 14:05 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 N999DZ page for operator, model, and routing details .

Mode-S ADF475 frequently asked

What is Mode-S code ADF475?
ADF475 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N999DZ.
Where is Mode-S ADF475 registered?
Mode-S code ADF475 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 ADF475 broadcasting right now?
No active broadcast right now. Last signal was 6h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ADF475, octal 53372165, decimal 11,400,309.
What flights does ADF475 operate?
Mode-S ADF475 has broadcast 11 distinct callsigns, including AIP1802, AIP1801, AIP1822, AIP92, AIP542.