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 23d ago
Flights observed
383
Distinct callsigns
20
Country
US
Last broadcast
23d 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 - 8 2026-07-04
ASA1357 - 7 2026-06-26
ASA468 Alaska Airlines 6 2026-05-30
ASA342 Alaska Airlines 5 2026-05-29
ASA1564 Alaska Airlines 5 2026-06-11
ASA790 Alaska Airlines 4 2026-05-06
ASA699 Alaska Airlines 4 2026-06-02
ASA66 Alaska Airlines 4 2026-06-13
ASA497 - 4 2026-06-29
ASA400 - 4 2026-07-11
ASA257 Alaska Airlines 4 2026-06-08
ASA23 Alaska Airlines 4 2026-07-08
ASA1404 Alaska Airlines 4 2026-06-11
ASA710 Alaska Airlines 3 2026-05-30
ASA702 - 3 2026-07-02
ASA686 - 3 2026-07-14
ASA60 Alaska Airlines 3 2026-05-14
ASA515 Alaska Airlines 3 2026-05-22
ASA5 Alaska Airlines 3 2026-07-22
ASA384 Alaska Airlines 3 2026-06-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA601 SEA → SFO Jul 26, 22:00 UTCJul 26, 22:45 UTC45m
2026-07-26 ASA273 PDX → SFO Jul 26, 19:12 UTCJul 26, 20:33 UTC1h 21m
2026-07-26 ASA273 PDX → SFO Jul 26, 19:15 UTCJul 26, 20:30 UTC1h 15m
2026-07-26 ASA395 SJC → PDX Jul 26, 11:17 UTCJul 26, 16:21 UTC5h 4m
2026-07-26 ASA395 SJC → PDX Jul 26, 11:20 UTCJul 26, 16:40 UTC5h 20m
2026-07-26 ASA707 LAX → PDX Jul 26, 04:35 UTCJul 26, 09:05 UTC4h 31m
2026-07-26 ASA707 LAX → PDX Jul 26, 04:32 UTCJul 26, 09:01 UTC4h 29m
2026-07-25 ASA25 BOS → SEA Jul 25, 21:10 UTCJul 26, 02:20 UTC5h 10m
2026-07-25 ASA24 SAN → JFK Jul 25, 14:15 UTCJul 25, 19:10 UTC4h 55m
2026-07-25 ASA336 PDX → FLL Jul 25, 02:40 UTCJul 25, 05:10 UTC2h 30m
2026-07-24 ASA1340 SJC → GDL Jul 24, 23:05 UTCJul 25, 00:35 UTC1h 30m
2026-07-24 ASA1522 SAN → SEA Jul 24, 20:55 UTCJul 24, 21:55 UTC1h 0m
2026-07-24 ASA751 PHX → PDX Jul 24, 03:25 UTCJul 24, 04:25 UTC1h 0m
2026-07-23 ASA561 SEA → AUS Jul 23, 21:50 UTCJul 23, 22:55 UTC1h 5m
2026-07-23 ASA561 SEA → AUS Jul 23, 21:46 UTCJul 23, 22:41 UTC55m
2026-07-23 ASA560 SEA → DFW Jul 23, 18:15 UTCJul 23, 19:25 UTC1h 10m
2026-07-22 ASA1522 SAN → SEA Jul 22, 23:50 UTCJul 23, 00:50 UTC1h 0m
2026-07-22 ASA5 DCA → LAX Jul 22, 17:30 UTCJul 22, 22:15 UTC4h 45m
2026-07-21 ASA6 LAX → DCA Jul 21, 19:40 UTCJul 22, 00:10 UTC4h 30m
2026-07-21 ASA1329 OAK → SEA Jul 21, 16:10 UTCJul 21, 17:05 UTC55m
2026-07-21 ASA1329 OAK → SEA Jul 21, 15:57 UTCJul 21, 16:54 UTC57m
2026-07-21 ASA634 LAS → SFO Jul 21, 01:45 UTCJul 21, 02:50 UTC1h 5m
2026-07-20 ASA778 PDX → LAS Jul 20, 22:20 UTCJul 21, 00:15 UTC1h 54m
2026-07-20 ASA778 PDX → LAS Jul 20, 22:26 UTCJul 21, 00:07 UTC1h 41m
2026-07-20 ASA684 DEN → PDX Jul 20, 18:15 UTCJul 20, 20:25 UTC2h 10m
2026-07-20 ASA401 DAL → SFO Jul 20, 14:40 UTCJul 20, 16:45 UTC2h 5m
2026-07-20 ASA1392 SJC → PVR Jul 20, 01:35 UTCJul 20, 03:35 UTC2h 0m
2026-07-20 ASA1392 SJC → PVR Jul 20, 01:39 UTCJul 20, 03:35 UTC1h 56m
2026-07-19 ASA1447 ORD → SAN Jul 19, 20:40 UTCJul 20, 00:10 UTC3h 30m
2026-07-19 ASA1446 SAN → ORD Jul 19, 14:50 UTCJul 19, 18:35 UTC3h 45m
2026-07-19 ASA369 PDX → SAN Jul 19, 01:20 UTCJul 19, 03:30 UTC2h 10m
2026-07-19 ASA369 PDX → SAN Jul 19, 01:16 UTCJul 19, 03:27 UTC2h 11m
2026-07-18 ASA267 ANC → PDX Jul 18, 20:10 UTCJul 18, 23:25 UTC3h 15m
2026-07-18 ASA88 - Jul 18, 00:39 UTCJul 18, 01:20 UTC40m
2026-07-17 ASA89 ANC → ADQ Jul 17, 22:35 UTCJul 17, 23:20 UTC45m
2026-07-17 ASA1810 SEA → ANC Jul 17, 18:10 UTCJul 17, 21:20 UTC3h 10m
2026-07-17 ASA9231 MCO → SEA Jul 17, 10:50 UTCJul 17, 16:10 UTC5h 20m
2026-07-16 ASA420 SEA → MCO Jul 16, 17:54 UTCJul 16, 23:10 UTC5h 15m
2026-07-16 ASA1314 SJC → SEA Jul 16, 13:34 UTCJul 16, 15:19 UTC1h 45m
2026-07-16 ASA1624 - Jul 16, 05:40 UTCJul 16, 06:40 UTC1h 0m
2026-07-15 ASA397 MCO → SAN Jul 15, 23:50 UTCJul 16, 04:25 UTC4h 35m
2026-07-15 ASA396 SAN → MCO Jul 15, 17:20 UTCJul 15, 21:45 UTC4h 25m
2026-07-15 ASA1680 SMF → SAN Jul 15, 14:30 UTCJul 15, 15:45 UTC1h 15m
2026-07-15 ASA1622 PDX → SMF Jul 15, 01:20 UTCJul 15, 02:35 UTC1h 15m
2026-07-14 ASA686 SEA → PDX Jul 14, 23:35 UTCJul 15, 00:10 UTC35m
2026-07-14 ASA548 - Jul 14, 20:00 UTCJul 14, 22:00 UTC2h 0m
2026-07-14 ASA759 - Jul 14, 16:30 UTCJul 14, 19:00 UTC2h 30m
2026-07-14 ASA282 - Jul 14, 04:15 UTCJul 14, 05:45 UTC1h 30m
2026-07-14 ASA393 - Jul 14, 01:20 UTCJul 14, 03:05 UTC1h 45m
2026-07-13 ASA312 - Jul 13, 20:35 UTCJul 13, 23:45 UTC3h 10m

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 23d 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, ASA1357, ASA468, ASA342, ASA1564.