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
Broadcasting now · callsign BYF31 · 3,075 ft
Flights observed
140
Distinct callsigns
1
Country
US
Last broadcast
45m ago

Current position

A8484B is currently broadcasting. Map zoomed to live position.

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 - 140 2026-06-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-02 BYF31 - Jun 2, 20:05 UTCJun 2, 20:45 UTC40m
2026-06-02 BYF31 SQL → SQL Jun 2, 18:05 UTCJun 2, 18:40 UTC35m
2026-06-01 BYF31 MCC → SQL Jun 1, 23:45 UTCJun 2, 00:35 UTC50m
2026-05-31 BYF31 SQL → MCC May 31, 16:20 UTCMay 31, 17:15 UTC55m
2026-05-30 BYF31 - May 30, 20:40 UTCMay 30, 21:40 UTC1h 0m
2026-05-30 BYF31 SQL → AUN May 30, 17:25 UTCMay 30, 18:25 UTC1h 0m
2026-05-29 BYF31 - May 29, 16:35 UTCMay 29, 17:00 UTC25m
2026-05-29 BYF31 SQL → SQL May 29, 16:10 UTCMay 29, 16:15 UTC5m
2026-05-29 BYF31 SQL → SQL May 29, 15:45 UTCMay 29, 16:05 UTC20m
2026-05-29 BYF31 SQL → SQL May 29, 02:15 UTCMay 29, 03:05 UTC50m
2026-05-28 BYF31 SQL → SQL May 28, 20:15 UTCMay 28, 20:30 UTC15m
2026-05-28 BYF31 SQL → SQL May 28, 20:00 UTCMay 28, 20:10 UTC10m
2026-05-28 BYF31 PAO → SQL May 28, 19:45 UTCMay 28, 19:55 UTC10m
2026-05-28 BYF31 SQL → PAO May 28, 19:25 UTCMay 28, 19:40 UTC15m
2026-05-27 BYF31 SQL → SQL May 27, 18:05 UTCMay 27, 18:10 UTC5m
2026-05-27 BYF31 SQL → SQL May 27, 17:50 UTCMay 27, 18:00 UTC10m
2026-05-27 BYF31 SQL → SQL May 27, 17:35 UTCMay 27, 17:40 UTC5m
2026-05-27 BYF31 SQL → SQL May 27, 17:25 UTCMay 27, 17:30 UTC5m
2026-05-27 BYF31 SQL → SQL May 27, 15:00 UTCMay 27, 16:05 UTC1h 5m
2026-05-25 BYF31 SQL → SQL May 25, 19:10 UTCMay 25, 19:20 UTC10m
2026-05-25 BYF31 SQL → SQL May 25, 18:55 UTCMay 25, 19:05 UTC10m
2026-05-25 BYF31 SQL → SQL May 25, 18:40 UTCMay 25, 18:50 UTC10m
2026-05-24 BYF31 SQL → SQL May 24, 17:20 UTCMay 24, 18:45 UTC1h 25m
2026-05-24 BYF31 - May 24, 02:55 UTCMay 24, 04:30 UTC1h 35m
2026-05-23 BYF31 SQL → SBP May 23, 22:10 UTCMay 23, 23:55 UTC1h 45m
2026-05-23 BYF31 SQL → SQL May 23, 00:55 UTCMay 23, 01:55 UTC1h 0m
2026-05-22 BYF31 SQL → SQL May 22, 17:40 UTCMay 22, 18:25 UTC45m
2026-05-22 BYF31 - May 22, 05:00 UTCMay 22, 05:30 UTC30m
2026-05-22 BYF31 - May 22, 03:25 UTCMay 22, 04:55 UTC1h 30m
2026-05-21 BYF31 - May 21, 23:30 UTCMay 22, 00:35 UTC1h 5m
2026-05-21 BYF31 - May 21, 22:40 UTCMay 21, 23:20 UTC40m
2026-05-21 BYF31 - May 21, 21:20 UTCMay 21, 21:35 UTC15m
2026-05-21 BYF31 SQL → SQL May 21, 20:50 UTCMay 21, 20:55 UTC5m
2026-05-21 BYF31 SQL → SQL May 21, 18:15 UTCMay 21, 19:05 UTC50m
2026-05-21 BYF31 - May 21, 16:55 UTCMay 21, 17:05 UTC10m
2026-05-21 BYF31 HWD → HWD May 21, 16:30 UTCMay 21, 16:35 UTC5m
2026-05-21 BYF31 SQL → HWD May 21, 16:05 UTCMay 21, 16:20 UTC15m
2026-05-21 BYF31 - May 21, 02:45 UTCMay 21, 03:50 UTC1h 5m
2026-05-21 BYF31 - May 21, 02:00 UTCMay 21, 02:40 UTC40m
2026-05-20 BYF31 SQL → SQL May 20, 22:15 UTCMay 20, 22:40 UTC25m
2026-05-20 BYF31 SQL → SQL May 20, 21:40 UTCMay 20, 22:10 UTC30m
2026-05-20 BYF31 SQL → SQL May 20, 19:35 UTCMay 20, 20:35 UTC1h 0m
2026-05-20 BYF31 - May 20, 17:10 UTCMay 20, 18:05 UTC55m
2026-05-20 BYF31 - May 20, 16:25 UTCMay 20, 17:00 UTC35m
2026-05-20 BYF31 - May 20, 02:45 UTCMay 20, 03:45 UTC1h 0m
2026-05-20 BYF31 - May 20, 01:50 UTCMay 20, 02:40 UTC50m
2026-05-20 BYF31 SQL → SQL May 20, 00:05 UTCMay 20, 00:10 UTC5m
2026-05-19 BYF31 SQL → SQL May 19, 22:50 UTCMay 20, 00:00 UTC1h 10m
2026-05-19 BYF31 SQL → SQL May 19, 20:35 UTCMay 19, 21:45 UTC1h 10m
2026-05-19 BYF31 SQL → SQL May 19, 18:35 UTCMay 19, 18:55 UTC20m

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?
Yes. Mode-S A8484B is currently airborne.
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.