Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A5F3CF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N483AS · BOEING 737-900 · operated by ALASKA AIRLINES INC

Hex
A5F3CF
Octal
51371717
Decimal
10,875,855
Country
US
Tail
N483AS
Type
B739
No current signal · last broadcast Jul 26, 20:20 UTC
Flights observed
431
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:20 UTC

Last known position

Most recent position reported by Mode-S A5F3CF.

Country allocation

The ICAO 24-bit address A5F3CF 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 20 distinct

Callsign Airline Flights Last seen
ASA775 - 6 2026-07-17
ASA462 Alaska Airlines 5 2026-05-03
ASA379 Alaska Airlines 5 2026-07-22
ASA1394 Alaska Airlines 5 2026-07-24
ASA737 Alaska Airlines 4 2026-06-27
ASA67 Alaska Airlines 4 2026-07-23
ASA616 - 4 2026-07-06
ASA562 Alaska Airlines 4 2026-06-14
ASA507 Alaska Airlines 4 2026-05-27
ASA418 - 4 2026-06-24
ASA382 Alaska Airlines 4 2026-06-04
ASA331 Alaska Airlines 4 2026-05-31
ASA226 Alaska Airlines 4 2026-04-23
ASA1415 Alaska Airlines 4 2026-04-27
ASA1410 - 4 2026-07-18
ASA1367 - 4 2026-06-28
ASA95 Alaska Airlines 3 2026-06-04
ASA75 - 3 2026-07-15
ASA693 - 3 2026-06-16
ASA684 Alaska Airlines 3 2026-04-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 ASA1335 BZE → LAX Jul 25, 22:30 UTCJul 26, 20:20 UTC21h 51m
2026-07-25 ASA1334 LAX → BZE Jul 25, 20:15 UTCJul 26, 17:45 UTC21h 31m
2026-07-25 ASA717 SAN → SFO Jul 25, 16:05 UTCJul 25, 18:25 UTC2h 20m
2026-07-25 ASA717 SAN → SFO Jul 25, 16:02 UTCJul 25, 18:16 UTC2h 14m
2026-07-25 ASA550 EWR → SFO Jul 25, 02:00 UTCJul 25, 05:50 UTC3h 50m
2026-07-24 ASA380 SEA → MSP Jul 24, 21:45 UTCJul 25, 00:30 UTC2h 45m
2026-07-24 ASA1394 SJD → SJC Jul 24, 18:00 UTCJul 24, 20:15 UTC2h 15m
2026-07-24 ASA541 AUS → PDX Jul 24, 12:40 UTCJul 24, 16:20 UTC3h 40m
2026-07-24 ASA372 SEA → DFW Jul 24, 01:45 UTCJul 24, 05:20 UTC3h 35m
2026-07-23 ASA579 SAN → SEA Jul 23, 18:30 UTCJul 23, 22:20 UTC3h 50m
2026-07-23 ASA579 SAN → SEA Jul 23, 18:37 UTCJul 23, 22:11 UTC3h 34m
2026-07-23 ASA578 LAX → PDX Jul 23, 13:15 UTCJul 23, 16:30 UTC3h 15m
2026-07-23 ASA221 JFK → SEA Jul 23, 09:00 UTCJul 23, 11:50 UTC2h 50m
2026-07-23 ASA67 SEA → KTN Jul 23, 05:25 UTCJul 23, 07:00 UTC1h 35m
2026-07-23 ASA67 SEA → KTN Jul 23, 03:25 UTCJul 23, 03:40 UTC15m
2026-07-23 ASA67 SEA → KTN Jul 23, 01:40 UTCJul 23, 02:00 UTC20m
2026-07-22 ASA67 SEA → KTN Jul 22, 23:00 UTCJul 23, 00:10 UTC1h 10m
2026-07-22 ASA785 LAS → SEA Jul 22, 18:35 UTCJul 22, 20:35 UTC2h 0m
2026-07-22 ASA612 SEA → LAS Jul 22, 15:10 UTCJul 22, 17:15 UTC2h 5m
2026-07-22 ASA379 BWI → SEA Jul 22, 00:30 UTCJul 22, 05:25 UTC4h 55m
2026-07-21 ASA378 SEA → BWI Jul 21, 17:00 UTCJul 21, 22:10 UTC5h 10m
2026-07-21 ASA594 - Jul 21, 04:45 UTCJul 21, 06:45 UTC2h 0m
2026-07-21 ASA594 ONT → SEA Jul 21, 04:41 UTCJul 21, 06:37 UTC1h 56m
2026-07-21 ASA592 CUN → SFO Jul 21, 01:20 UTCJul 21, 03:40 UTC2h 20m
2026-07-20 ASA446 PHL → SEA Jul 20, 21:25 UTCJul 20, 23:25 UTC2h 0m
2026-07-20 ASA208 - Jul 20, 18:05 UTCJul 20, 19:55 UTC1h 50m
2026-07-20 ASA344 - Jul 20, 11:40 UTCJul 20, 16:00 UTC4h 20m
2026-07-20 ASA343 - Jul 20, 06:05 UTCJul 20, 09:40 UTC3h 35m
2026-07-20 ASA1681 LAS → SEA Jul 20, 02:05 UTCJul 20, 04:15 UTC2h 10m
2026-07-19 ASA600 SEA → LAS Jul 19, 22:25 UTCJul 20, 00:35 UTC2h 10m
2026-07-19 ASA785 LAS → SEA Jul 19, 18:45 UTCJul 19, 20:40 UTC1h 55m
2026-07-19 ASA612 SEA → LAS Jul 19, 15:15 UTCJul 19, 17:25 UTC2h 10m
2026-07-19 ASA612 SEA → LAS Jul 19, 15:11 UTCJul 19, 17:13 UTC2h 2m
2026-07-19 ASA1498 - Jul 19, 09:40 UTCJul 19, 12:35 UTC2h 55m
2026-07-19 ASA1532 SEA → LAX Jul 19, 02:35 UTCJul 19, 07:55 UTC5h 20m
2026-07-18 ASA731 PDX → PHX Jul 18, 22:40 UTCJul 19, 01:00 UTC2h 20m
2026-07-18 ASA251 GEG → PDX Jul 18, 19:45 UTCJul 18, 20:35 UTC50m
2026-07-18 ASA250 PDX → GEG Jul 18, 17:40 UTCJul 18, 18:25 UTC45m
2026-07-18 ASA1410 - Jul 18, 14:35 UTCJul 18, 15:45 UTC1h 10m
2026-07-17 ASA1561 ANC → SFO Jul 17, 22:49 UTCJul 18, 03:05 UTC4h 16m
2026-07-17 ASA1561 ANC → SFO Jul 17, 22:55 UTCJul 18, 03:02 UTC4h 7m
2026-07-17 ASA775 PDX → ANC Jul 17, 18:11 UTCJul 17, 21:22 UTC3h 11m
2026-07-17 ASA775 PDX → ANC Jul 17, 18:15 UTCJul 17, 21:30 UTC3h 15m
2026-07-17 ASA511 BNA → PDX Jul 17, 14:50 UTCJul 17, 16:55 UTC2h 5m
2026-07-17 ASA1550 ANC → PHX Jul 17, 07:30 UTCJul 17, 12:50 UTC5h 20m
2026-07-17 ASA271 PDX → ANC Jul 17, 02:10 UTCJul 17, 05:20 UTC3h 10m
2026-07-16 ASA742 PHX → PDX Jul 16, 22:35 UTCJul 17, 00:40 UTC2h 5m
2026-07-16 ASA593 SEA → PHX Jul 16, 18:25 UTCJul 16, 20:49 UTC2h 25m
2026-07-16 ASA409 IAD → SEA Jul 16, 10:35 UTCJul 16, 15:25 UTC4h 50m
2026-07-15 ASA406 SEA → IAD Jul 15, 23:15 UTCJul 16, 03:40 UTC4h 25m

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 N483AS page for operator, model, and routing details .

Mode-S A5F3CF frequently asked

What is Mode-S code A5F3CF?
A5F3CF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N483AS.
Where is Mode-S A5F3CF registered?
Mode-S code A5F3CF 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 A5F3CF broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A5F3CF, octal 51371717, decimal 10,875,855.
What flights does A5F3CF operate?
Mode-S A5F3CF has broadcast 20 distinct callsigns, including ASA775, ASA462, ASA379, ASA1394, ASA737.