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sensors Mode-S transponder

A70AA1

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N553AS · BOEING 737-800 · operated by ALASKA AIRLINES INC

Hex
A70AA1
Octal
51605241
Decimal
10,947,233
Country
US
Tail
N553AS
Type
B738
No current signal · last broadcast Jul 26, 21:25 UTC
Flights observed
494
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:25 UTC

Last known position

Most recent position reported by Mode-S A70AA1.

Country allocation

The ICAO 24-bit address A70AA1 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
ASA686 - 6 2026-07-12
ASA60 Alaska Airlines 6 2026-06-03
ASA589 - 6 2026-06-15
ASA1355 Alaska Airlines 6 2026-06-15
ASA750 Alaska Airlines 5 2026-06-07
ASA702 - 5 2026-07-17
ASA69 Alaska Airlines 5 2026-06-03
ASA658 Alaska Airlines 5 2026-06-03
ASA472 - 5 2026-07-17
ASA264 Alaska Airlines 5 2026-06-14
ASA1627 - 5 2026-07-13
ASA88 Alaska Airlines 4 2026-07-24
ASA777 Alaska Airlines 4 2026-06-13
ASA759 Alaska Airlines 4 2026-07-19
ASA740 - 4 2026-07-04
ASA550 Alaska Airlines 4 2026-04-18
ASA549 - 4 2026-07-15
ASA521 Alaska Airlines 4 2026-05-17
ASA432 - 4 2026-07-09
ASA1508 Alaska Airlines 4 2026-07-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA1322 STS → SEA Jul 26, 20:00 UTCJul 26, 21:20 UTC1h 20m
2026-07-26 ASA1321 SEA → STS Jul 26, 17:00 UTCJul 26, 18:30 UTC1h 30m
2026-07-26 ASA1365 PVR → SFO Jul 26, 13:10 UTCJul 26, 15:10 UTC2h 0m
2026-07-26 ASA1389 SJD → SEA Jul 26, 04:50 UTCJul 26, 06:50 UTC2h 1m
2026-07-26 ASA1389 SJD → SEA Jul 26, 04:48 UTCJul 26, 06:44 UTC1h 56m
2026-07-26 ASA1807 DEN → PDX Jul 26, 01:15 UTCJul 26, 03:35 UTC2h 20m
2026-07-25 ASA1809 PDX → DEN Jul 25, 21:40 UTCJul 25, 23:45 UTC2h 5m
2026-07-25 ASA1405 BZE → SEA Jul 25, 18:00 UTCJul 25, 19:50 UTC1h 50m
2026-07-25 ASA699 SFO → PHX Jul 25, 13:50 UTCJul 25, 16:15 UTC2h 25m
2026-07-25 ASA594 PDX → SFO Jul 25, 04:50 UTCJul 25, 06:50 UTC2h 0m
2026-07-25 ASA592 CUN → SFO Jul 25, 01:30 UTCJul 25, 03:45 UTC2h 15m
2026-07-24 ASA601 SEA → SFO Jul 24, 22:05 UTCJul 24, 23:30 UTC1h 25m
2026-07-24 ASA273 PDX → SFO Jul 24, 19:25 UTCJul 24, 20:40 UTC1h 15m
2026-07-24 ASA210 SEA → SFO Jul 24, 13:40 UTCJul 24, 16:50 UTC3h 10m
2026-07-24 ASA1512 BZN → SEA Jul 24, 06:55 UTCJul 24, 10:10 UTC3h 15m
2026-07-24 ASA1518 SAN → ORD Jul 24, 02:15 UTCJul 24, 05:05 UTC2h 50m
2026-07-24 ASA88 ADQ → ANC Jul 24, 00:05 UTCJul 24, 00:55 UTC50m
2026-07-23 ASA89 ANC → ADQ Jul 23, 22:10 UTCJul 23, 22:55 UTC45m
2026-07-23 ASA9233 SJD → SFO Jul 23, 19:00 UTCJul 23, 20:00 UTC1h 0m
2026-07-23 ASA9231 MCO → SFO Jul 23, 16:55 UTCJul 23, 17:50 UTC55m
2026-07-23 ASA257 SJC → KOA Jul 23, 03:10 UTCJul 23, 03:20 UTC10m
2026-07-23 ASA257 SJC → KOA Jul 23, 00:25 UTCJul 23, 02:54 UTC2h 29m
2026-07-22 ASA1558 ANC → ADK Jul 22, 20:30 UTCJul 23, 03:20 UTC6h 50m
2026-07-21 ASA1544 ANC → OME Jul 21, 02:40 UTCJul 21, 03:55 UTC1h 15m
2026-07-21 ASA1544 ANC → OME Jul 21, 00:10 UTCJul 21, 00:55 UTC45m
2026-07-20 ASA44 - Jul 20, 22:25 UTCJul 20, 22:30 UTC5m
2026-07-20 ASA44 - Jul 20, 21:20 UTCJul 20, 22:30 UTC1h 10m
2026-07-20 ASA44 - Jul 20, 21:32 UTCJul 20, 22:10 UTC38m
2026-07-20 ASA43 - Jul 20, 19:05 UTCJul 20, 19:50 UTC45m
2026-07-20 ASA9668 - Jul 20, 16:40 UTCJul 20, 17:25 UTC45m
2026-07-20 ASA9721 ANC → AKN Jul 20, 15:05 UTCJul 20, 15:55 UTC50m
2026-07-20 ASA9667 PVR → OAK Jul 20, 05:50 UTCJul 20, 05:57 UTC7m
2026-07-20 ASA9667 PVR → OAK Jul 20, 05:10 UTCJul 20, 05:30 UTC20m
2026-07-20 ASA9722 ORD → MSN Jul 20, 03:35 UTCJul 20, 04:25 UTC50m
2026-07-19 ASA99 SEA → ANC Jul 19, 23:00 UTCJul 20, 02:15 UTC3h 15m
2026-07-19 ASA548 MZT → SFO Jul 19, 19:35 UTCJul 19, 21:40 UTC2h 5m
2026-07-19 ASA759 SFO → LAS Jul 19, 15:45 UTCJul 19, 18:10 UTC2h 25m
2026-07-19 ASA499 PDX → SEA Jul 19, 13:30 UTCJul 19, 14:00 UTC30m
2026-07-19 ASA1807 DEN → PDX Jul 19, 01:25 UTCJul 19, 03:45 UTC2h 20m
2026-07-18 ASA1809 PDX → DEN Jul 18, 21:30 UTCJul 18, 23:40 UTC2h 10m
2026-07-18 ASA1699 - Jul 18, 18:05 UTCJul 18, 19:45 UTC1h 40m
2026-07-18 ASA1449 - Jul 18, 14:50 UTCJul 18, 16:50 UTC2h 0m
2026-07-18 ASA1566 - Jul 18, 12:15 UTCJul 18, 13:10 UTC55m
2026-07-18 ASA1566 BOI → PDX Jul 18, 12:11 UTCJul 18, 13:05 UTC54m
2026-07-18 ASA463 SEA → BOI Jul 18, 05:15 UTCJul 18, 06:15 UTC1h 0m
2026-07-18 ASA1508 AUS → PDX Jul 18, 00:04 UTCJul 18, 03:25 UTC3h 21m
2026-07-18 ASA1508 AUS → PDX Jul 18, 00:02 UTCJul 18, 03:17 UTC3h 15m
2026-07-17 ASA1507 SEA → FAI Jul 17, 19:25 UTCJul 17, 22:29 UTC3h 5m
2026-07-17 ASA702 - Jul 17, 15:15 UTCJul 17, 17:30 UTC2h 15m
2026-07-17 ASA472 - Jul 17, 01:20 UTCJul 17, 03:45 UTC2h 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 N553AS page for operator, model, and routing details .

Mode-S A70AA1 frequently asked

What is Mode-S code A70AA1?
A70AA1 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N553AS.
Where is Mode-S A70AA1 registered?
Mode-S code A70AA1 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 A70AA1 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A70AA1, octal 51605241, decimal 10,947,233.
What flights does A70AA1 operate?
Mode-S A70AA1 has broadcast 20 distinct callsigns, including ASA686, ASA60, ASA589, ASA1355, ASA750.