Apparatus

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sensors Mode-S transponder

AB3518

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N821FJ · PIPER PA-28-140/150/160/180 · operated by 8TH DIMENSION ENTERPRISES LLC

Hex
AB3518
Octal
52632430
Decimal
11,220,248
Country
US
Tail
N821FJ
Type
P28A
No current signal · last broadcast 3h ago
Flights observed
82
Distinct callsigns
1
Country
US
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S AB3518.

Country allocation

The ICAO 24-bit address AB3518 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
N821FJ - 82 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 N821FJ BJC → BJC Jul 14, 03:40 UTCJul 14, 05:50 UTC2h 10m
2026-07-05 N821FJ - Jul 5, 17:00 UTCJul 5, 17:10 UTC10m
2026-07-05 N821FJ - Jul 5, 15:50 UTCJul 5, 16:55 UTC1h 5m
2026-07-04 N821FJ - Jul 4, 12:10 UTCJul 4, 13:05 UTC55m
2026-07-04 N821FJ - Jul 4, 11:55 UTCJul 4, 12:05 UTC10m
2026-07-03 N821FJ BJC → BJC Jul 3, 17:55 UTCJul 3, 18:40 UTC45m
2026-07-03 N821FJ BJC → BJC Jul 3, 15:55 UTCJul 3, 17:00 UTC1h 5m
2026-07-02 N821FJ BJC → BJC Jul 2, 13:15 UTCJul 2, 14:50 UTC1h 35m
2026-06-25 N821FJ - Jun 25, 19:44 UTCJun 25, 20:14 UTC30m
2026-06-25 N821FJ BJC → GXY Jun 25, 17:30 UTCJun 25, 18:04 UTC35m
2026-06-24 N821FJ BJC → BJC Jun 24, 13:30 UTCJun 24, 14:15 UTC45m
2026-06-23 N821FJ BJC → BJC Jun 23, 15:44 UTCJun 23, 17:25 UTC1h 40m
2026-06-23 N821FJ BJC → BJC Jun 23, 13:05 UTCJun 23, 14:25 UTC1h 20m
2026-06-22 N821FJ BJC → BJC Jun 22, 14:49 UTCJun 22, 15:20 UTC30m
2026-06-21 N821FJ BJC → BJC Jun 21, 14:30 UTCJun 21, 16:25 UTC1h 55m
2026-06-20 N821FJ - Jun 20, 17:19 UTCJun 20, 17:59 UTC40m
2026-06-20 N821FJ BJC → BJC Jun 20, 02:00 UTCJun 20, 04:44 UTC2h 45m
2026-06-19 N821FJ BJC → BJC Jun 19, 15:24 UTCJun 19, 17:09 UTC1h 45m
2026-06-19 N821FJ BJC → BJC Jun 19, 04:19 UTCJun 19, 05:14 UTC55m
2026-06-18 N821FJ BJC → BJC Jun 18, 16:05 UTCJun 18, 17:50 UTC1h 45m
2026-06-17 N821FJ BJC → BJC Jun 17, 04:55 UTCJun 17, 05:15 UTC20m
2026-06-17 N821FJ BJC → BJC Jun 17, 04:20 UTCJun 17, 04:30 UTC10m
2026-06-16 N821FJ BJC → BJC Jun 16, 13:25 UTCJun 16, 14:45 UTC1h 20m
2026-06-15 N821FJ BJC → BJC Jun 15, 13:54 UTCJun 15, 15:25 UTC1h 30m
2026-06-14 N821FJ BJC → BJC Jun 14, 14:45 UTCJun 14, 15:25 UTC40m
2026-06-12 N821FJ BJC → BJC Jun 12, 18:15 UTCJun 12, 19:25 UTC1h 10m
2026-06-12 N821FJ BJC → BJC Jun 12, 13:05 UTCJun 12, 15:00 UTC1h 55m
2026-06-10 N821FJ BJC → BJC Jun 10, 16:25 UTCJun 10, 17:25 UTC1h 0m
2026-06-08 N821FJ BJC → BJC Jun 8, 15:25 UTCJun 8, 16:05 UTC40m
2026-06-06 N821FJ BJC → BJC Jun 6, 14:34 UTCJun 6, 16:04 UTC1h 30m
2026-06-05 N821FJ BJC → BJC Jun 5, 23:45 UTCJun 6, 01:20 UTC1h 35m
2026-06-03 N821FJ BJC → BJC Jun 3, 18:20 UTCJun 3, 19:35 UTC1h 15m
2026-06-03 N821FJ BJC → BJC Jun 3, 15:05 UTCJun 3, 16:35 UTC1h 30m
2026-06-02 N821FJ - Jun 2, 14:30 UTCJun 2, 14:45 UTC15m
2026-06-02 N821FJ - Jun 2, 14:10 UTCJun 2, 14:25 UTC15m
2026-06-02 N821FJ - Jun 2, 13:40 UTCJun 2, 14:05 UTC25m
2026-05-30 N821FJ BJC → BJC May 30, 19:30 UTCMay 30, 20:05 UTC35m
2026-05-30 N821FJ BJC → BJC May 30, 14:45 UTCMay 30, 15:20 UTC35m
2026-05-26 N821FJ BJC → BJC May 26, 17:20 UTCMay 26, 18:50 UTC1h 30m
2026-05-26 N821FJ - May 26, 14:09 UTCMay 26, 15:24 UTC1h 15m
2026-05-26 N821FJ - May 26, 13:45 UTCMay 26, 14:05 UTC20m
2026-05-25 N821FJ BJC → BJC May 25, 17:00 UTCMay 25, 18:05 UTC1h 5m
2026-05-25 N821FJ BJC → BJC May 25, 13:50 UTCMay 25, 14:30 UTC40m
2026-05-24 N821FJ BJC → BJC May 24, 15:05 UTCMay 24, 17:05 UTC2h 0m
2026-05-23 N821FJ BJC → BJC May 23, 18:40 UTCMay 23, 19:10 UTC30m
2026-05-22 N821FJ - May 22, 19:10 UTCMay 22, 20:05 UTC55m
2026-05-22 N821FJ - May 22, 15:35 UTCMay 22, 16:35 UTC1h 0m
2026-05-16 N821FJ BJC → BJC May 16, 18:45 UTCMay 16, 18:55 UTC10m
2026-05-15 N821FJ BJC → BJC May 15, 17:05 UTCMay 15, 18:30 UTC1h 25m
2026-05-12 N821FJ BJC → BJC May 12, 17:25 UTCMay 12, 19:10 UTC1h 45m

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 N821FJ page for operator, model, and routing details .

Mode-S AB3518 frequently asked

What is Mode-S code AB3518?
AB3518 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N821FJ.
Where is Mode-S AB3518 registered?
Mode-S code AB3518 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 AB3518 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AB3518, octal 52632430, decimal 11,220,248.
What flights does AB3518 operate?
Mode-S AB3518 has broadcast 1 distinct callsign, including N821FJ.