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sensors Mode-S transponder

A6F5B5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N548AS · BOEING 737-800 · operated by ALASKA AIRLINES INC

Hex
A6F5B5
Octal
51572665
Decimal
10,941,877
Country
US
Tail
N548AS
Type
B738
Broadcasting now · callsign ASA129 · 36,000 ft
Flights observed
27
Distinct callsigns
13
Country
US
Last broadcast
21m ago

Current position

A6F5B5 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A6F5B5 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 13 distinct

Callsign Airline Flights Last seen
ASA1319 Alaska Airlines 4 2026-04-16
ASA757 Alaska Airlines 3 2026-04-17
ASA358 Alaska Airlines 3 2026-04-15
ASA751 Alaska Airlines 2 2026-04-15
ASA676 Alaska Airlines 2 2026-04-18
ASA562 Alaska Airlines 2 2026-04-17
ASA448 Alaska Airlines 2 2026-04-18
ASA212 Alaska Airlines 2 2026-04-18
ASA1402 Alaska Airlines 2 2026-04-16
ASA1394 Alaska Airlines 2 2026-04-16
ASA619 Alaska Airlines 1 2026-04-14
ASA559 Alaska Airlines 1 2026-04-17
ASA129 Alaska Airlines 1 2026-04-18

Recent flights last 27

DateFlightRouteTakeoffLandingDuration
2026-04-18 ASA129 SMF → SEA Apr 18, 17:55 UTCApr 18, 19:15 UTC1h 20m
2026-04-18 ASA212 SEA → SJC Apr 18, 14:24 UTCApr 18, 15:00 UTC36m
2026-04-18 ASA212 SEA → SJC Apr 18, 14:25 UTCApr 18, 15:15 UTC50m
2026-04-18 ASA448 SFO → TPA Apr 18, 04:45 UTCApr 18, 04:55 UTC10m
2026-04-18 ASA448 SFO → TPA Apr 18, 04:16 UTCApr 18, 04:52 UTC36m
2026-04-18 ASA676 SEA → LAS Apr 18, 01:25 UTCApr 18, 03:05 UTC1h 40m
2026-04-18 ASA676 SEA → LAS Apr 18, 00:55 UTCApr 18, 01:15 UTC20m
2026-04-17 ASA757 PDX → LAS Apr 17, 22:10 UTCApr 17, 22:55 UTC45m
2026-04-17 ASA757 PDX → LAS Apr 17, 19:25 UTCApr 17, 20:45 UTC1h 20m
2026-04-17 ASA757 PDX → LAS Apr 17, 18:05 UTCApr 17, 19:20 UTC1h 15m
2026-04-17 ASA562 SFO → LAS Apr 17, 15:20 UTCApr 17, 16:25 UTC1h 5m
2026-04-17 ASA562 SFO → LAS Apr 17, 14:25 UTCApr 17, 15:15 UTC49m
2026-04-17 ASA559 SFO → SEA Apr 17, 01:20 UTCApr 17, 02:59 UTC1h 40m
2026-04-16 ASA1402 SFO → AUS Apr 16, 23:20 UTCApr 16, 23:45 UTC25m
2026-04-16 ASA1402 SFO → AUS Apr 16, 21:30 UTCApr 16, 23:10 UTC1h 40m
2026-04-16 ASA1394 SJD → SJC Apr 16, 19:15 UTCApr 16, 19:45 UTC30m
2026-04-16 ASA1394 SJD → SJC Apr 16, 17:44 UTCApr 16, 19:10 UTC1h 25m
2026-04-16 ASA1319 SFO → PDX Apr 16, 01:40 UTCApr 16, 02:50 UTC1h 10m
2026-04-15 ASA1319 SFO → PDX Apr 15, 23:10 UTCApr 16, 00:10 UTC1h 0m
2026-04-15 ASA1319 SFO → PDX Apr 15, 21:05 UTCApr 15, 23:00 UTC1h 55m
2026-04-15 ASA1319 SFO → PDX Apr 15, 20:40 UTCApr 15, 21:00 UTC20m
2026-04-15 ASA358 PDX → BOS Apr 15, 17:05 UTCApr 15, 19:00 UTC1h 55m
2026-04-15 ASA358 PDX → BOS Apr 15, 15:05 UTCApr 15, 17:00 UTC1h 55m
2026-04-15 ASA358 PDX → BOS Apr 15, 14:16 UTCApr 15, 18:51 UTC4h 35m
2026-04-15 ASA751 PHX → PDX Apr 15, 02:55 UTCApr 15, 03:10 UTC15m
2026-04-15 ASA751 PHX → PDX Apr 15, 01:51 UTCApr 15, 03:04 UTC1h 13m
2026-04-14 ASA619 PHX → SEA Apr 14, 23:30 UTCApr 15, 00:50 UTC1h 20m

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 N548AS page for operator, model, and routing details .

Mode-S A6F5B5 frequently asked

What is Mode-S code A6F5B5?
A6F5B5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N548AS.
Where is Mode-S A6F5B5 registered?
Mode-S code A6F5B5 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 A6F5B5 broadcasting right now?
Yes. Mode-S A6F5B5 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6F5B5, octal 51572665, decimal 10,941,877.
What flights does A6F5B5 operate?
Mode-S A6F5B5 has broadcast 13 distinct callsigns, including ASA1319, ASA757, ASA358, ASA751, ASA676.