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sensors Mode-S transponder

A5C899

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N472AS · BOEING 737-900 · operated by ALASKA AIRLINES INC

Hex
A5C899
Octal
51344231
Decimal
10,864,793
Country
US
Tail
N472AS
Type
B739
Broadcasting now · callsign ASA410 · 30,975 ft
Flights observed
459
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Current position

A5C899 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A5C899 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
ASA216 Alaska Airlines 8 2026-04-28
ASA508 - 7 2026-07-02
ASA785 Alaska Airlines 5 2026-06-10
ASA67 - 5 2026-07-08
ASA418 - 5 2026-07-10
ASA385 Alaska Airlines 5 2026-06-11
ASA238 Alaska Airlines 5 2026-06-18
ASA1346 - 5 2026-07-12
ASA727 - 4 2026-07-11
ASA701 - 4 2026-07-22
ASA650 - 4 2026-07-06
ASA637 - 4 2026-07-19
ASA377 - 4 2026-07-11
ASA259 - 4 2026-06-19
ASA252 Alaska Airlines 4 2026-05-22
ASA142 - 4 2026-04-13
ASA1391 Alaska Airlines 4 2026-07-25
ASA645 Alaska Airlines 3 2026-07-03
ASA587 Alaska Airlines 3 2026-05-09
ASA563 Alaska Airlines 3 2026-06-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA419 SFO → LAS Jul 26, 21:00 UTCJul 26, 22:15 UTC1h 15m
2026-07-26 ASA300 SAN → LIH Jul 26, 14:20 UTCJul 26, 19:15 UTC4h 55m
2026-07-26 ASA1457 LAS → PAE Jul 26, 06:15 UTCJul 26, 06:50 UTC36m
2026-07-26 ASA1382 SEA → PVR Jul 26, 00:35 UTCJul 26, 03:50 UTC3h 15m
2026-07-25 ASA1382 SEA → PVR Jul 25, 23:31 UTCJul 26, 03:36 UTC4h 5m
2026-07-25 ASA1391 SJD → SEA Jul 25, 17:27 UTCJul 25, 21:37 UTC4h 10m
2026-07-25 ASA1391 SJD → SEA Jul 25, 17:15 UTCJul 25, 20:15 UTC3h 0m
2026-07-25 ASA491 RDU → SEA Jul 25, 13:35 UTCJul 25, 15:05 UTC1h 30m
2026-07-25 ASA706 SFO → LAS Jul 25, 00:40 UTCJul 25, 02:30 UTC1h 50m
2026-07-24 ASA332 SJC → SEA Jul 24, 19:40 UTCJul 24, 22:35 UTC2h 55m
2026-07-24 ASA79 SJC → PVR Jul 24, 15:05 UTCJul 24, 18:15 UTC3h 10m
2026-07-24 ASA458 PDX → MCO Jul 24, 04:15 UTCJul 24, 13:40 UTC9h 25m
2026-07-24 ASA1413 GDL → LAX Jul 24, 01:05 UTCJul 24, 02:40 UTC1h 35m
2026-07-24 ASA1413 GDL → LAX Jul 24, 01:02 UTCJul 24, 02:27 UTC1h 25m
2026-07-23 ASA1366 SJD → LAX Jul 23, 21:50 UTCJul 23, 23:45 UTC1h 55m
2026-07-23 ASA629 LAS → SEA Jul 23, 18:15 UTCJul 23, 20:10 UTC1h 55m
2026-07-23 ASA777 SEA → OAK Jul 23, 14:50 UTCJul 23, 16:55 UTC2h 5m
2026-07-23 ASA366 MKE → SEA Jul 23, 03:05 UTCJul 23, 05:05 UTC2h 0m
2026-07-22 ASA1456 SJC → PDX Jul 22, 23:45 UTCJul 23, 01:55 UTC2h 10m
2026-07-22 ASA596 - Jul 22, 20:30 UTCJul 22, 22:00 UTC1h 30m
2026-07-22 ASA653 SFO → ZIH Jul 22, 17:20 UTCJul 22, 18:40 UTC1h 20m
2026-07-22 ASA701 LAS → SEA Jul 22, 13:32 UTCJul 22, 15:10 UTC1h 38m
2026-07-22 ASA701 LAS → SEA Jul 22, 13:15 UTCJul 22, 15:15 UTC2h 0m
2026-07-22 ASA478 SEA → LAS Jul 22, 02:15 UTCJul 22, 04:20 UTC2h 5m
2026-07-21 ASA465 LAX → SJD Jul 21, 22:30 UTCJul 22, 00:40 UTC2h 10m
2026-07-21 ASA467 SFO → ZIH Jul 21, 18:35 UTCJul 21, 21:00 UTC2h 25m
2026-07-21 ASA78 SEA → ANC Jul 21, 11:35 UTCJul 21, 16:50 UTC5h 15m
2026-07-21 ASA77 - Jul 21, 05:50 UTCJul 21, 09:35 UTC3h 45m
2026-07-21 ASA339 SFO → JFK Jul 21, 00:30 UTCJul 21, 04:20 UTC3h 50m
2026-07-20 ASA604 SEA → AUS Jul 20, 19:35 UTCJul 20, 23:20 UTC3h 45m
2026-07-20 ASA365 DFW → SEA Jul 20, 14:25 UTCJul 20, 17:50 UTC3h 25m
2026-07-20 ASA424 SEA → BOS Jul 20, 02:30 UTCJul 20, 05:50 UTC3h 20m
2026-07-19 ASA697 - Jul 19, 23:50 UTCJul 20, 00:50 UTC1h 0m
2026-07-19 ASA697 - Jul 19, 21:35 UTCJul 19, 22:20 UTC45m
2026-07-19 ASA637 PHX → SEA Jul 19, 16:33 UTCJul 19, 18:55 UTC2h 22m
2026-07-19 ASA637 PHX → SEA Jul 19, 16:35 UTCJul 19, 19:05 UTC2h 30m
2026-07-19 ASA632 SEA → PHX Jul 19, 03:30 UTCJul 19, 06:00 UTC2h 30m
2026-07-18 ASA535 - Jul 18, 22:45 UTCJul 19, 01:05 UTC2h 20m
2026-07-18 ASA535 SEA → DEN Jul 18, 19:00 UTCJul 18, 21:05 UTC2h 5m
2026-07-18 ASA277 PHL → SEA Jul 18, 11:45 UTCJul 18, 17:05 UTC5h 20m
2026-07-18 ASA522 SEA → PHL Jul 18, 05:30 UTCJul 18, 10:00 UTC4h 30m
2026-07-17 ASA226 ANC → SEA Jul 17, 23:39 UTCJul 18, 02:50 UTC3h 11m
2026-07-17 ASA1825 ORD → ANC Jul 17, 16:04 UTCJul 17, 22:10 UTC6h 5m
2026-07-17 ASA1543 - Jul 17, 07:25 UTCJul 17, 12:55 UTC5h 30m
2026-07-17 ASA46 - Jul 17, 05:10 UTCJul 17, 05:55 UTC45m
2026-07-17 ASA46 BET → ANC Jul 17, 05:05 UTCJul 17, 05:58 UTC53m
2026-07-17 ASA45 - Jul 17, 02:50 UTCJul 17, 03:30 UTC40m
2026-07-16 ASA667 SEA → ANC Jul 16, 04:00 UTCJul 16, 07:15 UTC3h 15m
2026-07-15 ASA226 - Jul 15, 23:15 UTCJul 16, 02:15 UTC3h 0m
2026-07-15 ASA433 SEA → ANC Jul 15, 18:25 UTCJul 15, 21:45 UTC3h 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 N472AS page for operator, model, and routing details .

Mode-S A5C899 frequently asked

What is Mode-S code A5C899?
A5C899 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N472AS.
Where is Mode-S A5C899 registered?
Mode-S code A5C899 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 A5C899 broadcasting right now?
Yes. Mode-S A5C899 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A5C899, octal 51344231, decimal 10,864,793.
What flights does A5C899 operate?
Mode-S A5C899 has broadcast 20 distinct callsigns, including ASA216, ASA508, ASA785, ASA67, ASA418.