Apparatus

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sensors Mode-S transponder

A720EB

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N559AS · BOEING 737-800 · operated by ALASKA AIRLINES INC

Hex
A720EB
Octal
51620353
Decimal
10,952,939
Country
US
Tail
N559AS
Type
B738
No current signal · last broadcast 1h ago
Flights observed
238
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S A720EB.

Country allocation

The ICAO 24-bit address A720EB 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
ASA1321 Alaska Airlines 7 2026-06-16
ASA468 Alaska Airlines 6 2026-05-30
ASA342 Alaska Airlines 5 2026-05-29
ASA1564 Alaska Airlines 5 2026-06-11
ASA1357 Alaska Airlines 5 2026-05-20
ASA790 Alaska Airlines 4 2026-05-06
ASA699 Alaska Airlines 4 2026-06-02
ASA66 Alaska Airlines 4 2026-06-13
ASA257 Alaska Airlines 4 2026-06-08
ASA1404 Alaska Airlines 4 2026-06-11
ASA710 Alaska Airlines 3 2026-05-30
ASA60 Alaska Airlines 3 2026-05-14
ASA515 Alaska Airlines 3 2026-05-22
ASA497 Alaska Airlines 3 2026-05-15
ASA384 Alaska Airlines 3 2026-06-04
ASA253 Alaska Airlines 3 2026-05-04
ASA234 Alaska Airlines 3 2026-05-07
ASA1588 Alaska Airlines 3 2026-06-08
ASA1405 Alaska Airlines 3 2026-06-02
ASA9452 Alaska Airlines 2 2026-04-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-18 ASA6 - Jun 18, 19:00 UTCJun 18, 22:45 UTC3h 45m
2026-06-18 ASA1329 OAK → SEA Jun 18, 15:45 UTCJun 18, 16:45 UTC1h 0m
2026-06-18 ASA1625 LAX → SFO Jun 18, 13:15 UTCJun 18, 14:10 UTC55m
2026-06-18 ASA63 SFO → LAX Jun 18, 03:40 UTCJun 18, 05:55 UTC2h 15m
2026-06-17 ASA1375 LTO → LAX Jun 17, 23:45 UTCJun 18, 02:00 UTC2h 15m
2026-06-17 ASA1375 LTO → LAX Jun 17, 23:44 UTCJun 18, 01:46 UTC2h 2m
2026-06-17 ASA1604 SFO → LAX Jun 17, 21:20 UTCJun 17, 22:20 UTC1h 0m
2026-06-17 ASA227 JFK → SFO Jun 17, 13:50 UTCJun 17, 19:35 UTC5h 45m
2026-06-17 ASA22 - Jun 17, 06:40 UTCJun 17, 11:05 UTC4h 25m
2026-06-17 ASA400 SBA → SEA Jun 17, 02:40 UTCJun 17, 04:50 UTC2h 10m
2026-06-16 ASA400 - Jun 16, 23:30 UTCJun 17, 01:35 UTC2h 5m
2026-06-16 ASA1322 STS → SEA Jun 16, 20:10 UTCJun 16, 21:45 UTC1h 35m
2026-06-16 ASA1321 SEA → STS Jun 16, 17:10 UTCJun 16, 18:35 UTC1h 25m
2026-06-16 ASA1321 SEA → STS Jun 16, 17:08 UTCJun 16, 18:35 UTC1h 27m
2026-06-16 ASA701 LAS → SEA Jun 16, 13:15 UTCJun 16, 15:24 UTC2h 10m
2026-06-16 ASA704 - Jun 16, 03:35 UTCJun 16, 05:40 UTC2h 5m
2026-06-15 ASA218 SFO → PDX Jun 15, 20:25 UTCJun 16, 01:30 UTC5h 5m
2026-06-15 ASA784 PDX → ATL Jun 15, 14:45 UTCJun 15, 18:55 UTC4h 10m
2026-06-15 ASA729 PHX → PDX Jun 15, 03:05 UTCJun 15, 03:55 UTC50m
2026-06-14 ASA729 PHX → PDX Jun 14, 22:14 UTCJun 15, 03:52 UTC5h 38m
2026-06-14 ASA723 AUS → SEA Jun 14, 15:00 UTCJun 14, 15:45 UTC45m
2026-06-14 ASA723 AUS → SEA Jun 14, 15:00 UTCJun 14, 19:54 UTC4h 54m
2026-06-14 ASA650 LAX → SFO Jun 14, 03:45 UTCJun 14, 06:05 UTC2h 20m
2026-06-14 ASA744 - Jun 14, 00:10 UTCJun 14, 02:35 UTC2h 25m
2026-06-13 ASA596 LAS → PDX Jun 13, 20:40 UTCJun 13, 22:10 UTC1h 30m
2026-06-13 ASA596 LAS → PDX Jun 13, 20:53 UTCJun 13, 21:59 UTC1h 6m
2026-06-13 ASA653 SFO → ZIH Jun 13, 18:10 UTCJun 13, 19:40 UTC1h 30m
2026-06-13 ASA302 SJC → LIH Jun 13, 11:40 UTCJun 13, 16:10 UTC4h 30m
2026-06-13 ASA298 LAX → AUS Jun 13, 06:25 UTCJun 13, 10:10 UTC3h 45m
2026-06-13 ASA66 JNU → SEA Jun 13, 02:45 UTCJun 13, 04:45 UTC1h 59m
2026-06-13 ASA66 JNU → SEA Jun 13, 00:45 UTCJun 13, 01:10 UTC25m
2026-06-12 ASA66 JNU → SEA Jun 12, 22:55 UTCJun 12, 23:25 UTC30m
2026-06-12 ASA66 JNU → SEA Jun 12, 21:20 UTCJun 12, 21:55 UTC35m
2026-06-12 ASA357 BOS → SFO Jun 12, 16:50 UTCJun 12, 20:10 UTC3h 20m
2026-06-12 ASA1554 JNU → SEA Jun 12, 13:00 UTCJun 12, 15:00 UTC2h 0m
2026-06-12 ASA1554 JNU → SEA Jun 12, 12:58 UTCJun 12, 14:47 UTC1h 49m
2026-06-12 ASA71 SEA → JNU Jun 12, 04:35 UTCJun 12, 06:45 UTC2h 10m
2026-06-12 ASA71 SEA → JNU Jun 12, 04:34 UTCJun 12, 06:45 UTC2h 11m
2026-06-12 ASA774 SNA → SEA Jun 12, 00:55 UTCJun 12, 03:15 UTC2h 20m
2026-06-11 ASA773 EWR → SAN Jun 11, 21:40 UTCJun 11, 23:55 UTC2h 15m
2026-06-11 ASA471 PVR → SAN Jun 11, 17:45 UTCJun 11, 20:00 UTC2h 15m
2026-06-11 ASA1404 SEA → BZE Jun 11, 14:15 UTCJun 11, 16:20 UTC2h 5m
2026-06-11 ASA498 SAN → PDX Jun 11, 04:50 UTCJun 11, 05:20 UTC30m
2026-06-11 ASA1564 ANC → JNU Jun 11, 02:50 UTCJun 11, 03:05 UTC15m
2026-06-11 ASA1564 ANC → JNU Jun 11, 01:20 UTCJun 11, 02:45 UTC1h 25m
2026-06-10 ASA1564 ANC → JNU Jun 10, 23:50 UTCJun 11, 00:05 UTC15m
2026-06-10 ASA1564 ANC → JNU Jun 10, 21:25 UTCJun 10, 21:45 UTC20m
2026-06-10 ASA1564 ANC → JNU Jun 10, 18:50 UTCJun 10, 20:10 UTC1h 20m
2026-06-10 ASA1339 CUN → LAX Jun 10, 15:05 UTCJun 10, 15:45 UTC40m
2026-06-10 ASA1339 CUN → LAX Jun 10, 15:02 UTCJun 10, 15:50 UTC48m

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 N559AS page for operator, model, and routing details .

Mode-S A720EB frequently asked

What is Mode-S code A720EB?
A720EB is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N559AS.
Where is Mode-S A720EB registered?
Mode-S code A720EB 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 A720EB 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 A720EB, octal 51620353, decimal 10,952,939.
What flights does A720EB operate?
Mode-S A720EB has broadcast 20 distinct callsigns, including ASA1321, ASA468, ASA342, ASA1564, ASA1357.