Apparatus

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sensors Mode-S transponder

A1B7AD

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N21FG · BEECH 200 Super King Air · operated by CALIFORNIA DEPARTMENT OF FISH AND GAME

Hex
A1B7AD
Octal
50333655
Decimal
10,598,317
Country
US
Tail
N21FG
Type
BE20
No current signal · last broadcast 1d ago
Flights observed
113
Distinct callsigns
1
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A1B7AD.

Country allocation

The ICAO 24-bit address A1B7AD 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
N21FG - 113 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 N21FG - Jul 25, 00:10 UTCJul 25, 01:25 UTC1h 15m
2026-07-24 N21FG - Jul 24, 21:45 UTCJul 24, 22:50 UTC1h 5m
2026-07-24 N21FG - Jul 24, 03:40 UTCJul 24, 04:55 UTC1h 15m
2026-07-24 N21FG - Jul 24, 02:10 UTCJul 24, 03:20 UTC1h 10m
2026-07-20 N21FG - Jul 20, 20:40 UTCJul 20, 21:55 UTC1h 15m
2026-07-17 N21FG - Jul 17, 22:49 UTCJul 17, 23:50 UTC1h 0m
2026-07-17 N21FG - Jul 17, 21:25 UTCJul 17, 22:00 UTC35m
2026-07-17 N21FG - Jul 17, 20:04 UTCJul 17, 21:20 UTC1h 15m
2026-07-17 N21FG - Jul 17, 18:10 UTCJul 17, 19:00 UTC50m
2026-07-17 N21FG - Jul 17, 16:59 UTCJul 17, 17:30 UTC30m
2026-07-17 N21FG - Jul 17, 03:20 UTCJul 17, 04:10 UTC50m
2026-07-17 N21FG - Jul 17, 01:15 UTCJul 17, 02:50 UTC1h 35m
2026-07-17 N21FG - Jul 17, 00:10 UTCJul 17, 00:45 UTC35m
2026-07-16 N21FG - Jul 16, 22:19 UTCJul 16, 23:15 UTC55m
2026-07-16 N21FG - Jul 16, 21:00 UTCJul 16, 21:25 UTC25m
2026-07-16 N21FG - Jul 16, 20:00 UTCJul 16, 20:39 UTC40m
2026-07-16 N21FG - Jul 16, 18:15 UTCJul 16, 19:14 UTC1h 0m
2026-07-16 N21FG - Jul 16, 16:05 UTCJul 16, 17:14 UTC1h 10m
2026-07-16 N21FG - Jul 16, 14:29 UTCJul 16, 15:10 UTC40m
2026-07-03 N21FG - Jul 3, 21:50 UTCJul 3, 23:05 UTC1h 15m
2026-07-03 N21FG - Jul 3, 19:20 UTCJul 3, 20:30 UTC1h 10m
2026-07-03 N21FG - Jul 3, 17:35 UTCJul 3, 18:50 UTC1h 15m
2026-07-01 N21FG - Jul 1, 01:25 UTCJul 1, 02:30 UTC1h 5m
2026-06-30 N21FG - Jun 30, 23:20 UTCJul 1, 00:55 UTC1h 35m
2026-06-30 N21FG - Jun 30, 12:50 UTCJun 30, 14:50 UTC2h 0m
2026-06-30 N21FG OXR → SAC Jun 30, 11:25 UTCJun 30, 12:45 UTC1h 20m
2026-06-26 N21FG - Jun 26, 16:09 UTCJun 26, 17:25 UTC1h 15m
2026-06-22 N21FG - Jun 22, 21:19 UTCJun 22, 22:05 UTC45m
2026-06-22 N21FG - Jun 22, 15:35 UTCJun 22, 16:20 UTC45m
2026-06-19 N21FG - Jun 19, 15:39 UTCJun 19, 16:49 UTC1h 10m
2026-06-18 N21FG - Jun 18, 22:00 UTCJun 18, 22:45 UTC45m
2026-06-18 N21FG - Jun 18, 20:35 UTCJun 18, 21:05 UTC30m
2026-06-18 N21FG - Jun 18, 20:05 UTCJun 18, 20:25 UTC20m
2026-06-18 N21FG - Jun 18, 14:10 UTCJun 18, 14:30 UTC20m
2026-06-18 N21FG - Jun 18, 13:00 UTCJun 18, 13:35 UTC35m
2026-06-18 N21FG - Jun 18, 11:55 UTCJun 18, 12:30 UTC35m
2026-06-12 N21FG - Jun 12, 23:35 UTCJun 13, 01:40 UTC2h 5m
2026-06-12 N21FG - Jun 12, 20:55 UTCJun 12, 22:15 UTC1h 20m
2026-06-12 N21FG - Jun 12, 18:20 UTCJun 12, 19:40 UTC1h 20m
2026-06-11 N21FG - Jun 11, 01:40 UTCJun 11, 02:20 UTC40m
2026-06-11 N21FG - Jun 11, 00:25 UTCJun 11, 00:55 UTC30m
2026-06-10 N21FG - Jun 10, 20:10 UTCJun 10, 20:45 UTC35m
2026-06-10 N21FG - Jun 10, 18:40 UTCJun 10, 19:15 UTC35m
2026-06-03 N21FG - Jun 3, 23:45 UTCJun 4, 00:50 UTC1h 5m
2026-06-03 N21FG - Jun 3, 23:00 UTCJun 3, 23:30 UTC30m
2026-06-03 N21FG - Jun 3, 21:05 UTCJun 3, 22:10 UTC1h 5m
2026-06-03 N21FG - Jun 3, 15:10 UTCJun 3, 16:10 UTC1h 0m
2026-06-03 N21FG - Jun 3, 13:45 UTCJun 3, 14:15 UTC30m
2026-06-03 N21FG - Jun 3, 11:35 UTCJun 3, 12:50 UTC1h 15m
2026-05-30 N21FG - May 30, 00:25 UTCMay 30, 01:30 UTC1h 5m

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 N21FG page for operator, model, and routing details .

Mode-S A1B7AD frequently asked

What is Mode-S code A1B7AD?
A1B7AD is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N21FG.
Where is Mode-S A1B7AD registered?
Mode-S code A1B7AD 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 A1B7AD 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 A1B7AD, octal 50333655, decimal 10,598,317.
What flights does A1B7AD operate?
Mode-S A1B7AD has broadcast 1 distinct callsign, including N21FG.