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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 1h ago
Flights observed
434
Distinct callsigns
20
Country
US
Last broadcast
1h ago

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
ASA69 Alaska Airlines 5 2026-06-03
ASA658 Alaska Airlines 5 2026-06-03
ASA264 Alaska Airlines 5 2026-06-14
ASA1627 - 5 2026-07-13
ASA777 Alaska Airlines 4 2026-06-13
ASA740 - 4 2026-07-04
ASA550 Alaska Airlines 4 2026-04-18
ASA521 Alaska Airlines 4 2026-05-17
ASA472 - 4 2026-07-03
ASA432 - 4 2026-07-09
ASA1336 - 4 2026-07-09
ASA9662 - 3 2026-06-24
ASA88 - 3 2026-07-01
ASA82 - 3 2026-06-16
ASA773 Alaska Airlines 3 2026-05-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 ASA566 - Jul 14, 04:10 UTCJul 14, 06:10 UTC2h 0m
2026-07-13 ASA1638 TPA → SAN Jul 13, 22:25 UTCJul 14, 02:50 UTC4h 25m
2026-07-13 ASA1639 - Jul 13, 15:55 UTCJul 13, 20:30 UTC4h 35m
2026-07-13 ASA1617 DEN → SAN Jul 13, 12:10 UTCJul 13, 14:05 UTC1h 55m
2026-07-13 ASA1617 DEN → SAN Jul 13, 12:10 UTCJul 13, 14:17 UTC2h 7m
2026-07-13 ASA1627 PDX → DEN Jul 13, 01:35 UTCJul 13, 03:45 UTC2h 10m
2026-07-12 ASA686 SEA → PDX Jul 12, 23:50 UTCJul 13, 00:20 UTC30m
2026-07-12 ASA548 SNA → SEA Jul 12, 20:22 UTCJul 12, 21:53 UTC1h 31m
2026-07-12 ASA548 - Jul 12, 20:01 UTCJul 12, 22:00 UTC2h 0m
2026-07-12 ASA759 - Jul 12, 15:45 UTCJul 12, 18:20 UTC2h 35m
2026-07-12 ASA400 - Jul 12, 03:15 UTCJul 12, 05:10 UTC1h 55m
2026-07-12 ASA400 - Jul 12, 00:01 UTCJul 12, 02:10 UTC2h 10m
2026-07-11 ASA1322 - Jul 11, 20:15 UTCJul 11, 21:40 UTC1h 25m
2026-07-11 ASA1321 - Jul 11, 17:00 UTCJul 11, 18:40 UTC1h 40m
2026-07-11 ASA701 LAS → SEA Jul 11, 13:10 UTCJul 11, 15:10 UTC2h 0m
2026-07-11 ASA704 SEA → LAS Jul 11, 03:35 UTCJul 11, 05:45 UTC2h 10m
2026-07-10 ASA510 MSP → SEA Jul 10, 22:05 UTCJul 11, 01:15 UTC3h 10m
2026-07-10 ASA1429 PDX → MSP Jul 10, 17:45 UTCJul 10, 20:40 UTC2h 55m
2026-07-10 ASA668 - Jul 10, 14:35 UTCJul 10, 16:30 UTC1h 55m
2026-07-10 ASA1563 ANC → LAX Jul 10, 07:45 UTCJul 10, 12:55 UTC5h 10m
2026-07-10 ASA1613 - Jul 10, 03:20 UTCJul 10, 04:30 UTC1h 10m
2026-07-10 ASA1537 ANC → JNU Jul 10, 00:52 UTCJul 10, 02:01 UTC1h 9m
2026-07-10 ASA1537 - Jul 10, 00:35 UTCJul 10, 01:50 UTC1h 15m
2026-07-09 ASA1347 FAI → ANC Jul 9, 22:45 UTCJul 9, 23:30 UTC45m
2026-07-09 ASA1347 FAI → ANC Jul 9, 22:52 UTCJul 9, 23:30 UTC38m
2026-07-09 ASA1336 ANC → FAI Jul 9, 20:35 UTCJul 9, 21:15 UTC40m
2026-07-09 ASA432 DEN → ANC Jul 9, 14:16 UTCJul 9, 19:13 UTC4h 57m
2026-07-09 ASA432 DEN → ANC Jul 9, 14:15 UTCJul 9, 19:20 UTC5h 5m
2026-07-09 ASA1627 PDX → DEN Jul 9, 01:15 UTCJul 9, 03:30 UTC2h 15m
2026-07-08 ASA686 SEA → PDX Jul 8, 23:15 UTCJul 8, 23:40 UTC25m
2026-07-08 ASA686 SEA → PDX Jul 8, 23:11 UTCJul 8, 23:41 UTC30m
2026-07-08 ASA654 - Jul 8, 19:15 UTCJul 8, 21:25 UTC2h 10m
2026-07-08 ASA654 ONT → SEA Jul 8, 19:10 UTCJul 8, 21:13 UTC2h 3m
2026-07-08 ASA1364 PDX → SJD Jul 8, 16:00 UTCJul 8, 18:10 UTC2h 10m
2026-07-08 ASA279 GEG → SEA Jul 8, 13:45 UTCJul 8, 14:25 UTC40m
2026-07-08 ASA1614 LAX → GEG Jul 8, 03:23 UTCJul 8, 04:55 UTC1h 32m
2026-07-07 ASA1300 - Jul 7, 23:35 UTCJul 8, 01:50 UTC2h 15m
2026-07-07 ASA676 LAS → SEA Jul 7, 19:30 UTCJul 7, 21:35 UTC2h 5m
2026-07-07 ASA676 LAS → SEA Jul 7, 19:29 UTCJul 7, 21:25 UTC1h 56m
2026-07-07 ASA1628 PDX → LAS Jul 7, 16:05 UTCJul 7, 17:50 UTC1h 45m
2026-07-07 ASA1628 PDX → LAS Jul 7, 16:01 UTCJul 7, 17:44 UTC1h 43m
2026-07-07 ASA650 PHX → PDX Jul 7, 04:05 UTCJul 7, 06:20 UTC2h 15m
2026-07-07 ASA744 SEA → PHX Jul 7, 00:23 UTCJul 7, 02:50 UTC2h 27m
2026-07-07 ASA744 SEA → PHX Jul 7, 00:30 UTCJul 7, 02:55 UTC2h 25m
2026-07-06 ASA579 SAN → SEA Jul 6, 18:20 UTCJul 6, 22:10 UTC3h 50m
2026-07-06 ASA578 LAX → PDX Jul 6, 13:15 UTCJul 6, 16:50 UTC3h 35m
2026-07-06 ASA594 PDX → SFO Jul 6, 05:05 UTCJul 6, 07:10 UTC2h 5m
2026-07-06 ASA592 CUN → SFO Jul 6, 01:50 UTCJul 6, 04:05 UTC2h 15m
2026-07-05 ASA330 - Jul 5, 21:10 UTCJul 5, 23:45 UTC2h 35m
2026-07-05 ASA327 SEA → ABQ Jul 5, 17:35 UTCJul 5, 20:00 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 1h ago.
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.