Apparatus

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sensors Mode-S transponder

A70333

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N551AS · BOEING 737-800 · operated by ALASKA AIRLINES INC

Hex
A70333
Octal
51601463
Decimal
10,945,331
Country
US
Tail
N551AS
Type
B738
No current signal · last broadcast Jul 26, 21:40 UTC
Flights observed
483
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:40 UTC

Last known position

Most recent position reported by Mode-S A70333.

Country allocation

The ICAO 24-bit address A70333 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
ASA695 Alaska Airlines 7 2026-05-19
ASA1325 - 7 2026-07-16
ASA91 - 5 2026-07-15
ASA67 Alaska Airlines 5 2026-06-11
ASA589 - 5 2026-06-23
ASA1405 Alaska Airlines 5 2026-07-24
ASA137 Alaska Airlines 5 2026-04-15
ASA710 Alaska Airlines 4 2026-05-29
ASA702 Alaska Airlines 4 2026-07-21
ASA64 - 4 2026-07-12
ASA630 Alaska Airlines 4 2026-06-30
ASA601 Alaska Airlines 4 2026-07-21
ASA548 - 4 2026-06-21
ASA461 - 4 2026-06-21
ASA350 Alaska Airlines 4 2026-06-01
ASA273 Alaska Airlines 4 2026-07-21
ASA177 Alaska Airlines 4 2026-04-16
ASA1434 Alaska Airlines 4 2026-07-24
ASA1404 Alaska Airlines 4 2026-07-24
ASA1321 Alaska Airlines 4 2026-05-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA9800 DCA → SFO Jul 26, 18:55 UTCJul 26, 21:30 UTC2h 35m
2026-07-24 ASA1809 PDX → DEN Jul 24, 21:40 UTCJul 24, 23:50 UTC2h 10m
2026-07-24 ASA1405 BZE → SEA Jul 24, 18:15 UTCJul 24, 20:05 UTC1h 50m
2026-07-24 ASA1404 SEA → BZE Jul 24, 14:20 UTCJul 24, 16:30 UTC2h 10m
2026-07-24 ASA1434 SJC → SJD Jul 24, 00:00 UTCJul 24, 03:25 UTC3h 25m
2026-07-23 ASA509 SEA → SJC Jul 23, 20:05 UTCJul 23, 22:45 UTC2h 40m
2026-07-23 ASA299 EWR → SEA Jul 23, 12:03 UTCJul 23, 16:51 UTC4h 48m
2026-07-23 ASA299 EWR → SEA Jul 23, 11:35 UTCJul 23, 17:10 UTC5h 35m
2026-07-23 ASA1631 SFO → EWR Jul 23, 05:05 UTCJul 23, 09:25 UTC4h 20m
2026-07-23 ASA1631 SFO → EWR Jul 23, 05:00 UTCJul 23, 09:09 UTC4h 9m
2026-07-22 ASA1434 SJC → SJD Jul 22, 23:45 UTCJul 23, 03:15 UTC3h 30m
2026-07-22 ASA1434 SJC → SJD Jul 22, 23:41 UTCJul 23, 03:00 UTC3h 19m
2026-07-22 ASA509 SEA → SJC Jul 22, 19:45 UTCJul 22, 22:25 UTC2h 40m
2026-07-22 ASA365 SFO → LAS Jul 22, 14:25 UTCJul 22, 17:55 UTC3h 30m
2026-07-22 ASA424 SEA → BOS Jul 22, 01:25 UTCJul 22, 04:50 UTC3h 25m
2026-07-21 ASA601 SEA → SFO Jul 21, 22:50 UTCJul 22, 00:05 UTC1h 15m
2026-07-21 ASA601 SEA → SFO Jul 21, 22:46 UTCJul 21, 23:53 UTC1h 7m
2026-07-21 ASA273 PDX → SFO Jul 21, 19:35 UTCJul 21, 20:55 UTC1h 20m
2026-07-21 ASA273 PDX → SFO Jul 21, 19:34 UTCJul 21, 20:49 UTC1h 15m
2026-07-21 ASA702 LAX → LAS Jul 21, 15:15 UTCJul 21, 17:40 UTC2h 25m
2026-07-21 ASA472 SEA → STL Jul 21, 00:35 UTCJul 21, 03:00 UTC2h 25m
2026-07-20 ASA332 ANC → SEA Jul 20, 19:45 UTCJul 20, 23:00 UTC3h 15m
2026-07-20 ASA332 ANC → SEA Jul 20, 19:44 UTCJul 20, 22:50 UTC3h 6m
2026-07-20 ASA232 - Jul 20, 17:50 UTCJul 20, 18:30 UTC40m
2026-07-20 ASA231 LAS → SFO Jul 20, 15:50 UTCJul 20, 16:35 UTC45m
2026-07-19 ASA660 PAE → PHX Jul 19, 22:25 UTCJul 20, 01:35 UTC3h 10m
2026-07-19 ASA664 LAS → SEA Jul 19, 18:55 UTCJul 19, 20:35 UTC1h 40m
2026-07-19 ASA360 SEA → SLC Jul 19, 15:55 UTCJul 19, 17:50 UTC1h 55m
2026-07-19 ASA594 - Jul 19, 04:40 UTCJul 19, 06:40 UTC2h 0m
2026-07-19 ASA592 CUN → SFO Jul 19, 01:30 UTCJul 19, 03:45 UTC2h 15m
2026-07-18 ASA601 SEA → SFO Jul 18, 22:10 UTCJul 18, 23:20 UTC1h 10m
2026-07-18 ASA273 PDX → SFO Jul 18, 19:35 UTCJul 18, 20:55 UTC1h 20m
2026-07-18 ASA702 - Jul 18, 15:15 UTCJul 18, 17:30 UTC2h 15m
2026-07-18 ASA472 - Jul 18, 01:45 UTCJul 18, 04:10 UTC2h 26m
2026-07-17 ASA1338 - Jul 17, 15:44 UTCJul 17, 23:35 UTC7h 50m
2026-07-16 ASA421 SEA → SFO Jul 16, 20:35 UTCJul 17, 04:10 UTC7h 35m
2026-07-16 ASA1325 - Jul 16, 14:05 UTCJul 16, 16:35 UTC2h 30m
2026-07-16 ASA1325 SNA → SEA Jul 16, 14:09 UTCJul 16, 16:13 UTC2h 4m
2026-07-16 ASA631 - Jul 16, 02:25 UTCJul 16, 05:00 UTC2h 35m
2026-07-16 ASA631 SEA → SNA Jul 16, 02:25 UTCJul 16, 04:51 UTC2h 26m
2026-07-15 ASA698 LAS → SEA Jul 15, 22:55 UTCJul 16, 00:50 UTC1h 55m
2026-07-15 ASA738 SEA → LAS Jul 15, 18:59 UTCJul 15, 20:59 UTC2h 0m
2026-07-15 ASA738 SEA → LAS Jul 15, 18:55 UTCJul 15, 21:05 UTC2h 10m
2026-07-15 ASA651 - Jul 15, 15:10 UTCJul 15, 17:05 UTC1h 55m
2026-07-15 ASA91 - Jul 15, 04:30 UTCJul 15, 06:15 UTC1h 45m
2026-07-15 ASA665 SLC → SEA Jul 15, 01:10 UTCJul 15, 02:40 UTC1h 30m
2026-07-14 ASA368 - Jul 14, 21:55 UTCJul 14, 23:40 UTC1h 44m
2026-07-14 ASA368 SEA → SLC Jul 14, 21:52 UTCJul 14, 23:29 UTC1h 37m
2026-07-14 ASA315 ANC → SEA Jul 14, 17:24 UTCJul 14, 20:01 UTC2h 37m
2026-07-14 ASA315 ANC → SEA Jul 14, 17:10 UTCJul 14, 20:15 UTC3h 5m

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 N551AS page for operator, model, and routing details .

Mode-S A70333 frequently asked

What is Mode-S code A70333?
A70333 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N551AS.
Where is Mode-S A70333 registered?
Mode-S code A70333 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 A70333 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A70333, octal 51601463, decimal 10,945,331.
What flights does A70333 operate?
Mode-S A70333 has broadcast 20 distinct callsigns, including ASA695, ASA1325, ASA91, ASA67, ASA589.