Apparatus

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sensors Mode-S transponder

A535C2

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N435AS · BOEING 737-900 · operated by ALASKA AIRLINES INC

Hex
A535C2
Octal
51232702
Decimal
10,827,202
Country
US
Tail
N435AS
Type
B739
No current signal · last broadcast Jul 26, 21:05 UTC
Flights observed
428
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:05 UTC

Last known position

Most recent position reported by Mode-S A535C2.

Country allocation

The ICAO 24-bit address A535C2 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
ASA404 - 6 2026-06-29
ASA228 Alaska Airlines 6 2026-05-23
ASA572 Alaska Airlines 5 2026-06-11
ASA200 Alaska Airlines 5 2026-05-23
ASA97 Alaska Airlines 4 2026-06-15
ASA634 - 4 2026-06-22
ASA494 Alaska Airlines 4 2026-07-20
ASA441 - 4 2026-04-13
ASA427 Alaska Airlines 4 2026-07-23
ASA328 Alaska Airlines 4 2026-05-18
ASA293 Alaska Airlines 4 2026-05-08
ASA266 - 4 2026-06-30
ASA253 - 4 2026-07-02
ASA252 Alaska Airlines 4 2026-07-02
ASA93 Alaska Airlines 3 2026-05-07
ASA780 Alaska Airlines 3 2026-06-02
ASA78 - 3 2026-07-10
ASA617 Alaska Airlines 3 2026-04-27
ASA559 - 3 2026-07-13
ASA547 - 3 2026-06-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA785 LAS → SEA Jul 26, 18:55 UTCJul 26, 20:55 UTC2h 0m
2026-07-26 ASA612 SEA → LAS Jul 26, 15:05 UTCJul 26, 17:10 UTC2h 5m
2026-07-26 ASA647 LAS → PDX Jul 26, 00:50 UTCJul 26, 04:45 UTC3h 55m
2026-07-25 ASA647 LAS → PDX Jul 25, 20:20 UTCJul 25, 23:40 UTC3h 20m
2026-07-25 ASA365 SFO → LAS Jul 25, 14:25 UTCJul 25, 18:00 UTC3h 35m
2026-07-25 ASA424 SEA → BOS Jul 25, 01:35 UTCJul 25, 04:55 UTC3h 20m
2026-07-24 ASA405 SEA → OKC Jul 24, 20:15 UTCJul 24, 23:45 UTC3h 30m
2026-07-24 ASA405 SEA → OKC Jul 24, 15:55 UTCJul 24, 18:55 UTC3h 0m
2026-07-24 ASA583 SNA → PDX Jul 24, 00:30 UTCJul 24, 04:25 UTC3h 55m
2026-07-24 ASA583 SNA → PDX Jul 24, 00:25 UTCJul 24, 04:16 UTC3h 51m
2026-07-23 ASA346 SFO → FLL Jul 23, 19:20 UTCJul 23, 22:35 UTC3h 15m
2026-07-23 ASA427 SEA → CVG Jul 23, 17:00 UTCJul 23, 17:40 UTC40m
2026-07-22 ASA646 PDX → PHX Jul 22, 23:20 UTCJul 23, 03:10 UTC3h 50m
2026-07-22 ASA392 PDX → DFW Jul 22, 18:20 UTCJul 22, 21:40 UTC3h 20m
2026-07-22 ASA399 MCO → SFO Jul 22, 14:20 UTCJul 22, 16:25 UTC2h 5m
2026-07-21 ASA397 MCO → SAN Jul 21, 23:45 UTCJul 22, 04:00 UTC4h 15m
2026-07-21 ASA396 - Jul 21, 17:35 UTCJul 21, 22:20 UTC4h 45m
2026-07-21 ASA1680 SMF → SAN Jul 21, 14:40 UTCJul 21, 15:55 UTC1h 15m
2026-07-21 ASA1427 PVR → SFO Jul 21, 04:20 UTCJul 21, 05:50 UTC1h 30m
2026-07-20 ASA494 SEA → SAT Jul 20, 22:15 UTCJul 21, 01:50 UTC3h 34m
2026-07-20 ASA494 SEA → SAT Jul 20, 17:25 UTCJul 20, 21:05 UTC3h 40m
2026-07-20 ASA302 SJC → LIH Jul 20, 11:15 UTCJul 20, 15:35 UTC4h 20m
2026-07-20 ASA298 SEA → CVG Jul 20, 05:40 UTCJul 20, 09:15 UTC3h 35m
2026-07-19 ASA494 - Jul 19, 23:50 UTCJul 20, 03:40 UTC3h 50m
2026-07-19 ASA494 SEA → SAT Jul 19, 16:55 UTCJul 19, 20:30 UTC3h 35m
2026-07-19 ASA1529 - Jul 19, 12:05 UTCJul 19, 14:40 UTC2h 35m
2026-07-19 ASA1526 SEA → MSY Jul 19, 03:15 UTCJul 19, 05:45 UTC2h 30m
2026-07-18 ASA425 PHX → SEA Jul 18, 22:55 UTCJul 19, 01:20 UTC2h 25m
2026-07-18 ASA747 PDX → PHX Jul 18, 19:20 UTCJul 18, 21:30 UTC2h 10m
2026-07-18 ASA747 - Jul 18, 17:55 UTCJul 18, 18:30 UTC35m
2026-07-18 ASA1572 LAS → PAE Jul 18, 14:15 UTCJul 18, 16:15 UTC2h 0m
2026-07-18 ASA1572 LAS → PAE Jul 18, 14:12 UTCJul 18, 16:09 UTC1h 57m
2026-07-18 ASA531 - Jul 18, 03:20 UTCJul 18, 03:35 UTC15m
2026-07-18 ASA531 PDX → LAS Jul 18, 01:15 UTCJul 18, 03:35 UTC2h 21m
2026-07-18 ASA531 PDX → LAS Jul 18, 01:14 UTCJul 18, 03:02 UTC1h 48m
2026-07-17 ASA742 PHX → PDX Jul 17, 21:34 UTCJul 17, 23:50 UTC2h 15m
2026-07-17 ASA593 SEA → PHX Jul 17, 17:55 UTCJul 17, 20:25 UTC2h 30m
2026-07-17 ASA283 - Jul 17, 12:00 UTCJul 17, 16:15 UTC4h 15m
2026-07-17 ASA280 SEA → CMH Jul 17, 06:40 UTCJul 17, 10:30 UTC3h 50m
2026-07-16 ASA304 BOS → SEA Jul 16, 23:20 UTCJul 17, 05:10 UTC5h 50m
2026-07-16 ASA306 SEA → BOS Jul 16, 16:15 UTCJul 16, 20:49 UTC4h 34m
2026-07-16 ASA306 SEA → BOS Jul 16, 16:15 UTCJul 16, 21:05 UTC4h 50m
2026-07-16 ASA501 - Jul 16, 01:25 UTCJul 16, 04:40 UTC3h 15m
2026-07-15 ASA497 - Jul 15, 21:05 UTCJul 16, 00:10 UTC3h 5m
2026-07-15 ASA338 BOS → SEA Jul 15, 13:40 UTCJul 15, 19:05 UTC5h 25m
2026-07-15 ASA536 SEA → BOS Jul 15, 06:45 UTCJul 15, 11:15 UTC4h 30m
2026-07-14 ASA326 TPA → SEA Jul 14, 23:50 UTCJul 15, 05:00 UTC5h 10m
2026-07-14 ASA262 SEA → TPA Jul 14, 17:00 UTCJul 14, 22:15 UTC5h 15m
2026-07-13 ASA469 BNA → SEA Jul 13, 23:30 UTCJul 14, 03:45 UTC4h 15m
2026-07-13 ASA1376 PDX → BNA Jul 13, 17:53 UTCJul 13, 21:55 UTC4h 2m

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 N435AS page for operator, model, and routing details .

Mode-S A535C2 frequently asked

What is Mode-S code A535C2?
A535C2 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N435AS.
Where is Mode-S A535C2 registered?
Mode-S code A535C2 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 A535C2 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A535C2, octal 51232702, decimal 10,827,202.
What flights does A535C2 operate?
Mode-S A535C2 has broadcast 20 distinct callsigns, including ASA404, ASA228, ASA572, ASA200, ASA97.