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sensors Mode-S transponder

AB351F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N821FR · operated by AIRPLANE FACTORY INC

Hex
AB351F
Octal
52632437
Decimal
11,220,255
Country
US
Tail
N821FR
Type
SLG4
No current signal · last broadcast Jul 25, 20:55 UTC
Flights observed
203
Distinct callsigns
1
Country
US
Last broadcast
Jul 25, 20:55 UTC

Last known position

Most recent position reported by Mode-S AB351F.

Country allocation

The ICAO 24-bit address AB351F 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
N821FR - 203 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 N821FR - Jul 25, 18:40 UTCJul 25, 20:55 UTC2h 15m
2026-07-24 N821FR TOA → TOA Jul 24, 23:20 UTCJul 25, 00:25 UTC1h 5m
2026-07-24 N821FR - Jul 24, 22:00 UTCJul 24, 22:15 UTC15m
2026-07-24 N821FR TOA → SMO Jul 24, 21:25 UTCJul 24, 21:45 UTC20m
2026-07-24 N821FR TOA → TOA Jul 24, 19:15 UTCJul 24, 20:15 UTC1h 0m
2026-07-24 N821FR TOA → TOA Jul 24, 16:40 UTCJul 24, 18:15 UTC1h 35m
2026-07-24 N821FR TOA → TOA Jul 24, 14:30 UTCJul 24, 15:35 UTC1h 5m
2026-07-24 N821FR TOA → TOA Jul 24, 00:40 UTCJul 24, 01:30 UTC50m
2026-07-23 N821FR - Jul 23, 21:50 UTCJul 23, 22:45 UTC55m
2026-07-23 N821FR TOA → TOA Jul 23, 19:40 UTCJul 23, 20:45 UTC1h 5m
2026-07-23 N821FR TOA → TOA Jul 23, 17:40 UTCJul 23, 18:45 UTC1h 5m
2026-07-22 N821FR CLD → TOA Jul 22, 20:20 UTCJul 22, 21:20 UTC1h 0m
2026-07-22 N821FR - Jul 22, 19:10 UTCJul 22, 19:50 UTC40m
2026-07-21 N821FR - Jul 21, 23:50 UTCJul 22, 00:55 UTC1h 5m
2026-07-21 N821FR TOA → TOA Jul 21, 21:55 UTCJul 21, 22:40 UTC45m
2026-07-21 N821FR TOA → TOA Jul 21, 19:40 UTCJul 21, 20:40 UTC1h 0m
2026-07-21 N821FR - Jul 21, 14:55 UTCJul 21, 16:50 UTC1h 55m
2026-07-20 N821FR TOA → TOA Jul 20, 23:40 UTCJul 21, 00:45 UTC1h 5m
2026-07-20 N821FR - Jul 20, 21:35 UTCJul 20, 21:50 UTC15m
2026-07-20 N821FR - Jul 20, 19:40 UTCJul 20, 20:40 UTC1h 0m
2026-07-20 N821FR - Jul 20, 17:30 UTCJul 20, 18:40 UTC1h 10m
2026-07-19 N821FR - Jul 19, 02:40 UTCJul 19, 03:40 UTC1h 0m
2026-07-18 N821FR TOA → SBA Jul 18, 18:20 UTCJul 18, 19:35 UTC1h 15m
2026-07-17 N821FR - Jul 17, 23:30 UTCJul 17, 23:50 UTC20m
2026-07-17 N821FR TOA → AVX Jul 17, 22:00 UTCJul 17, 22:29 UTC30m
2026-07-17 N821FR - Jul 17, 19:45 UTCJul 17, 20:44 UTC1h 0m
2026-07-17 N821FR TOA → TOA Jul 17, 17:15 UTCJul 17, 17:55 UTC40m
2026-07-17 N821FR - Jul 17, 01:15 UTCJul 17, 01:59 UTC45m
2026-07-16 N821FR - Jul 16, 20:45 UTCJul 16, 21:05 UTC20m
2026-07-16 N821FR SPQ → AVX Jul 16, 19:05 UTCJul 16, 19:30 UTC25m
2026-07-16 N821FR - Jul 16, 14:55 UTCJul 16, 16:49 UTC1h 55m
2026-07-16 N821FR TOA → TOA Jul 16, 04:45 UTCJul 16, 07:30 UTC2h 45m
2026-07-16 N821FR - Jul 16, 03:05 UTCJul 16, 03:15 UTC10m
2026-07-16 N821FR TOA → LGB Jul 16, 02:05 UTCJul 16, 02:55 UTC50m
2026-07-15 N821FR TOA → TOA Jul 15, 23:50 UTCJul 16, 01:00 UTC1h 10m
2026-07-15 N821FR TOA → TOA Jul 15, 21:50 UTCJul 15, 22:45 UTC55m
2026-07-15 N821FR - Jul 15, 19:35 UTCJul 15, 20:45 UTC1h 10m
2026-07-15 N821FR - Jul 15, 16:45 UTCJul 15, 18:30 UTC1h 45m
2026-07-15 N821FR TOA → TOA Jul 15, 01:40 UTCJul 15, 02:35 UTC55m
2026-07-14 N821FR - Jul 14, 23:50 UTCJul 15, 00:50 UTC1h 0m
2026-07-14 N821FR TOA → TOA Jul 14, 21:50 UTCJul 14, 22:55 UTC1h 4m
2026-07-14 N821FR - Jul 14, 19:45 UTCJul 14, 20:45 UTC1h 0m
2026-07-14 N821FR - Jul 14, 17:15 UTCJul 14, 18:15 UTC1h 0m
2026-07-13 N821FR CPM → TOA Jul 13, 23:45 UTCJul 14, 00:45 UTC1h 0m
2026-07-13 N821FR TOA → TOA Jul 13, 21:50 UTCJul 13, 22:35 UTC45m
2026-07-13 N821FR - Jul 13, 19:40 UTCJul 13, 20:40 UTC1h 0m
2026-07-12 N821FR - Jul 12, 23:50 UTCJul 13, 00:45 UTC55m
2026-07-11 N821FR - Jul 11, 02:05 UTCJul 11, 03:20 UTC1h 15m
2026-07-10 N821FR TOA → TOA Jul 10, 22:15 UTCJul 10, 22:35 UTC20m
2026-07-09 N821FR - Jul 9, 23:15 UTCJul 9, 23:30 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 N821FR page for operator, model, and routing details .

Mode-S AB351F frequently asked

What is Mode-S code AB351F?
AB351F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N821FR.
Where is Mode-S AB351F registered?
Mode-S code AB351F 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 AB351F broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 20:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AB351F, octal 52632437, decimal 11,220,255.
What flights does AB351F operate?
Mode-S AB351F has broadcast 1 distinct callsign, including N821FR.