Apparatus

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sensors Mode-S transponder

A81A7A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N621FJ · operated by 8TH DIMENSION ENTERPRISES LLC

Hex
A81A7A
Octal
52015172
Decimal
11,016,826
Country
US
Tail
N621FJ
Type
P28A
No current signal · last broadcast Jul 13, 15:35 UTC
Flights observed
111
Distinct callsigns
1
Country
US
Last broadcast
Jul 13, 15:35 UTC

Last known position

Most recent position reported by Mode-S A81A7A.

Country allocation

The ICAO 24-bit address A81A7A 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
N621FJ - 111 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 N621FJ BJC → BJC Jul 13, 14:20 UTCJul 13, 15:30 UTC1h 10m
2026-07-12 N621FJ BJC → BJC Jul 12, 12:55 UTCJul 12, 14:15 UTC1h 20m
2026-07-11 N621FJ BJC → BJC Jul 11, 13:50 UTCJul 11, 15:10 UTC1h 20m
2026-07-10 N621FJ BJC → BJC Jul 10, 20:00 UTCJul 10, 21:10 UTC1h 10m
2026-07-10 N621FJ BJC → BJC Jul 10, 16:50 UTCJul 10, 18:20 UTC1h 30m
2026-07-10 N621FJ - Jul 10, 02:00 UTCJul 10, 02:45 UTC45m
2026-07-10 N621FJ - Jul 10, 00:55 UTCJul 10, 01:55 UTC1h 0m
2026-07-09 N621FJ BJC → BJC Jul 9, 17:40 UTCJul 9, 18:30 UTC50m
2026-07-09 N621FJ BJC → BJC Jul 9, 04:10 UTCJul 9, 05:10 UTC1h 0m
2026-07-09 N621FJ BJC → BJC Jul 9, 00:20 UTCJul 9, 01:30 UTC1h 10m
2026-07-08 N621FJ - Jul 8, 15:35 UTCJul 8, 16:25 UTC50m
2026-07-08 N621FJ - Jul 8, 15:20 UTCJul 8, 15:30 UTC10m
2026-07-07 N621FJ BJC → BJC Jul 7, 00:20 UTCJul 7, 02:05 UTC1h 45m
2026-07-06 N621FJ BJC → BJC Jul 6, 19:40 UTCJul 6, 20:10 UTC30m
2026-07-06 N621FJ BJC → BJC Jul 6, 15:40 UTCJul 6, 16:05 UTC25m
2026-07-05 N621FJ BJC → BJC Jul 5, 16:40 UTCJul 5, 18:50 UTC2h 10m
2026-07-05 N621FJ BJC → BJC Jul 5, 01:45 UTCJul 5, 03:30 UTC1h 45m
2026-07-04 N621FJ BJC → BJC Jul 4, 16:25 UTCJul 4, 18:00 UTC1h 35m
2026-07-03 N621FJ BJC → BJC Jul 3, 21:40 UTCJul 3, 22:45 UTC1h 5m
2026-07-03 N621FJ - Jul 3, 18:30 UTCJul 3, 19:55 UTC1h 25m
2026-07-03 N621FJ BJC → BJC Jul 3, 16:30 UTCJul 3, 17:50 UTC1h 20m
2026-07-02 N621FJ BJC → BJC Jul 2, 17:05 UTCJul 2, 18:10 UTC1h 5m
2026-07-02 N621FJ BJC → BJC Jul 2, 13:55 UTCJul 2, 15:05 UTC1h 10m
2026-06-30 N621FJ - Jun 30, 17:20 UTCJun 30, 18:05 UTC45m
2026-06-30 N621FJ - Jun 30, 16:05 UTCJun 30, 16:45 UTC40m
2026-06-30 N621FJ BJC → BJC Jun 30, 00:35 UTCJun 30, 01:45 UTC1h 11m
2026-06-29 N621FJ BJC → BJC Jun 29, 15:24 UTCJun 29, 16:44 UTC1h 20m
2026-06-28 N621FJ BJC → BJC Jun 28, 17:50 UTCJun 28, 18:29 UTC40m
2026-06-28 N621FJ BJC → BJC Jun 28, 14:39 UTCJun 28, 16:05 UTC1h 25m
2026-06-27 N621FJ - Jun 27, 12:19 UTCJun 27, 13:30 UTC1h 10m
2026-06-27 N621FJ - Jun 27, 11:50 UTCJun 27, 12:04 UTC15m
2026-06-26 N621FJ BJC → BJC Jun 26, 19:14 UTCJun 26, 20:44 UTC1h 30m
2026-06-26 N621FJ - Jun 26, 17:25 UTCJun 26, 17:59 UTC35m
2026-06-26 N621FJ - Jun 26, 16:35 UTCJun 26, 17:19 UTC45m
2026-06-26 N621FJ BJC → BJC Jun 26, 13:04 UTCJun 26, 14:29 UTC1h 25m
2026-06-24 N621FJ BJC → BJC Jun 24, 13:34 UTCJun 24, 14:45 UTC1h 10m
2026-06-23 N621FJ - Jun 23, 21:45 UTCJun 23, 22:25 UTC40m
2026-06-23 N621FJ - Jun 23, 21:10 UTCJun 23, 21:39 UTC30m
2026-06-23 N621FJ BJC → BJC Jun 23, 13:09 UTCJun 23, 14:35 UTC1h 25m
2026-06-22 N621FJ BJC → BJC Jun 22, 13:19 UTCJun 22, 15:14 UTC1h 55m
2026-06-20 N621FJ BJC → BJC Jun 20, 13:09 UTCJun 20, 14:05 UTC55m
2026-06-19 N621FJ BJC → BJC Jun 19, 19:39 UTCJun 19, 20:49 UTC1h 10m
2026-06-19 N621FJ BJC → BJC Jun 19, 12:09 UTCJun 19, 13:39 UTC1h 30m
2026-06-18 N621FJ BJC → BJC Jun 18, 18:45 UTCJun 18, 20:30 UTC1h 45m
2026-06-18 N621FJ BJC → BJC Jun 18, 16:10 UTCJun 18, 17:40 UTC1h 30m
2026-06-16 N621FJ BJC → BJC Jun 16, 03:45 UTCJun 16, 05:45 UTC2h 0m
2026-06-15 N621FJ - Jun 15, 22:10 UTCJun 15, 23:15 UTC1h 5m
2026-06-15 N621FJ BJC → BJC Jun 15, 15:19 UTCJun 15, 16:59 UTC1h 40m
2026-06-13 N621FJ - Jun 13, 18:40 UTCJun 13, 19:00 UTC20m
2026-06-13 N621FJ BJC → APA Jun 13, 16:05 UTCJun 13, 16:30 UTC25m

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 N621FJ page for operator, model, and routing details .

Mode-S A81A7A frequently asked

What is Mode-S code A81A7A?
A81A7A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N621FJ.
Where is Mode-S A81A7A registered?
Mode-S code A81A7A 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 A81A7A broadcasting right now?
No active broadcast right now. Last signal was Jul 13, 15:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A81A7A, octal 52015172, decimal 11,016,826.
What flights does A81A7A operate?
Mode-S A81A7A has broadcast 1 distinct callsign, including N621FJ.