Apparatus

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sensors Mode-S transponder

A8484B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N63251 · CESSNA 172 Skyhawk · operated by CHRISTIANSEN AVIATION LLC

Hex
A8484B
Octal
52044113
Decimal
11,028,555
Country
US
Tail
N63251
Type
C172
No current signal · last broadcast 39m ago
Flights observed
276
Distinct callsigns
1
Country
US
Last broadcast
39m ago

Last known position

Most recent position reported by Mode-S A8484B.

Country allocation

The ICAO 24-bit address A8484B 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
BYF31 - 276 2026-07-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-18 BYF31 - Jul 18, 01:39 UTCJul 18, 02:09 UTC30m
2026-07-18 BYF31 - Jul 18, 00:00 UTCJul 18, 00:35 UTC35m
2026-07-17 BYF31 - Jul 17, 22:49 UTCJul 17, 23:14 UTC25m
2026-07-16 BYF31 - Jul 16, 23:44 UTCJul 17, 01:09 UTC1h 25m
2026-07-15 BYF31 - Jul 15, 21:15 UTCJul 16, 00:25 UTC3h 10m
2026-07-15 BYF31 - Jul 15, 18:10 UTCJul 15, 18:40 UTC30m
2026-07-15 BYF31 - Jul 15, 15:25 UTCJul 15, 17:35 UTC2h 10m
2026-07-15 BYF31 SQL → SQL Jul 15, 02:25 UTCJul 15, 02:30 UTC5m
2026-07-15 BYF31 SQL → SQL Jul 15, 02:00 UTCJul 15, 02:10 UTC10m
2026-07-15 BYF31 SQL → SQL Jul 15, 01:30 UTCJul 15, 01:45 UTC15m
2026-07-14 BYF31 SQL → SQL Jul 14, 20:50 UTCJul 14, 22:20 UTC1h 30m
2026-07-14 BYF31 SQL → SQL Jul 14, 18:15 UTCJul 14, 19:15 UTC1h 0m
2026-07-14 BYF31 SQL → SQL Jul 14, 00:05 UTCJul 14, 01:35 UTC1h 30m
2026-07-13 BYF31 SQL → SQL Jul 13, 21:00 UTCJul 13, 22:30 UTC1h 30m
2026-07-13 BYF31 APC → SQL Jul 13, 01:10 UTCJul 13, 01:40 UTC30m
2026-07-12 BYF31 SQL → APC Jul 12, 20:45 UTCJul 12, 21:35 UTC50m
2026-07-12 BYF31 SQL → SQL Jul 12, 18:10 UTCJul 12, 19:40 UTC1h 30m
2026-07-11 BYF31 SQL → SQL Jul 11, 17:35 UTCJul 11, 19:30 UTC1h 55m
2026-07-10 BYF31 SQL → SQL Jul 10, 18:25 UTCJul 10, 19:15 UTC50m
2026-07-10 BYF31 SQL → SQL Jul 10, 16:50 UTCJul 10, 16:55 UTC5m
2026-07-10 BYF31 SQL → SQL Jul 10, 16:35 UTCJul 10, 16:45 UTC10m
2026-07-10 BYF31 SQL → SQL Jul 10, 16:20 UTCJul 10, 16:30 UTC10m
2026-07-10 BYF31 SQL → SQL Jul 10, 16:00 UTCJul 10, 16:15 UTC15m
2026-07-09 BYF31 - Jul 9, 17:40 UTCJul 9, 18:40 UTC1h 0m
2026-07-09 BYF31 - Jul 9, 17:05 UTCJul 9, 17:35 UTC30m
2026-07-09 BYF31 SQL → SQL Jul 9, 04:15 UTCJul 9, 06:05 UTC1h 50m
2026-07-08 BYF31 - Jul 8, 23:20 UTCJul 9, 00:00 UTC40m
2026-07-08 BYF31 - Jul 8, 22:10 UTCJul 8, 23:15 UTC1h 5m
2026-07-07 BYF31 - Jul 7, 22:50 UTCJul 8, 00:25 UTC1h 35m
2026-07-07 BYF31 - Jul 7, 19:05 UTCJul 7, 20:55 UTC1h 50m
2026-07-06 BYF31 SQL → SQL Jul 6, 23:50 UTCJul 7, 01:05 UTC1h 15m
2026-07-06 BYF31 SQL → SQL Jul 6, 21:20 UTCJul 6, 22:45 UTC1h 25m
2026-07-06 BYF31 SQL → SQL Jul 6, 17:35 UTCJul 6, 17:45 UTC10m
2026-07-06 BYF31 SQL → SQL Jul 6, 17:20 UTCJul 6, 17:30 UTC10m
2026-07-06 BYF31 SQL → SQL Jul 6, 17:10 UTCJul 6, 17:15 UTC5m
2026-07-05 BYF31 SQL → SQL Jul 5, 23:35 UTCJul 6, 02:10 UTC2h 35m
2026-07-04 BYF31 SQL → SQL Jul 4, 18:45 UTCJul 4, 20:00 UTC1h 15m
2026-07-03 BYF31 SQL → SQL Jul 3, 21:55 UTCJul 3, 22:10 UTC15m
2026-07-03 BYF31 SQL → SQL Jul 3, 20:45 UTCJul 3, 21:40 UTC55m
2026-07-03 BYF31 SQL → SQL Jul 3, 17:50 UTCJul 3, 19:25 UTC1h 35m
2026-07-03 BYF31 SQL → SQL Jul 3, 02:55 UTCJul 3, 03:45 UTC50m
2026-07-02 BYF31 SQL → SQL Jul 2, 20:20 UTCJul 2, 22:05 UTC1h 45m
2026-07-02 BYF31 RHV → SQL Jul 2, 19:00 UTCJul 2, 19:20 UTC20m
2026-07-02 BYF31 SQL → RHV Jul 2, 18:30 UTCJul 2, 18:50 UTC20m
2026-07-01 BYF31 - Jul 1, 23:00 UTCJul 1, 23:25 UTC25m
2026-07-01 BYF31 SQL → CCR Jul 1, 22:15 UTCJul 1, 22:50 UTC35m
2026-07-01 BYF31 CCR → SQL Jul 1, 18:50 UTCJul 1, 20:00 UTC1h 10m
2026-07-01 BYF31 SQL → CCR Jul 1, 17:50 UTCJul 1, 18:35 UTC45m
2026-06-30 BYF31 SQL → SQL Jun 30, 21:25 UTCJun 30, 22:05 UTC40m
2026-06-30 BYF31 SQL → SQL Jun 30, 17:00 UTCJun 30, 17:05 UTC5m

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 N63251 page for operator, model, and routing details .

Mode-S A8484B frequently asked

What is Mode-S code A8484B?
A8484B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N63251.
Where is Mode-S A8484B registered?
Mode-S code A8484B 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 A8484B broadcasting right now?
No active broadcast right now. Last signal was 39m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8484B, octal 52044113, decimal 11,028,555.
What flights does A8484B operate?
Mode-S A8484B has broadcast 1 distinct callsign, including BYF31.