Apparatus

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sensors Mode-S transponder

A744B3

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N568AS · BOEING 737-800 · operated by ALASKA AIRLINES INC

Hex
A744B3
Octal
51642263
Decimal
10,962,099
Country
US
Tail
N568AS
Type
B738
Broadcasting now · callsign ASA205 · 40,000 ft
Flights observed
463
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:55 UTC

Current position

A744B3 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A744B3 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
ASA740 - 8 2026-06-26
ASA702 Alaska Airlines 5 2026-06-15
ASA61 - 5 2026-07-16
ASA60 Alaska Airlines 5 2026-06-08
ASA3 Alaska Airlines 5 2026-06-25
ASA234 - 5 2026-07-16
ASA88 - 4 2026-07-20
ASA791 Alaska Airlines 4 2026-04-18
ASA760 - 4 2026-06-14
ASA64 - 4 2026-07-05
ASA62 Alaska Airlines 4 2026-06-30
ASA519 Alaska Airlines 4 2026-05-31
ASA508 - 4 2026-06-23
ASA50 - 4 2026-06-30
ASA49 - 4 2026-06-30
ASA363 Alaska Airlines 4 2026-06-08
ASA245 Alaska Airlines 4 2026-06-05
ASA211 - 4 2026-07-07
ASA1404 Alaska Airlines 4 2026-07-22
ASA1344 Alaska Airlines 4 2026-05-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA1522 SAN → SEA Jul 26, 20:55 UTCJul 26, 21:55 UTC1h 0m
2026-07-26 ASA5 DCA → LAX Jul 26, 14:55 UTCJul 26, 19:25 UTC4h 30m
2026-07-25 ASA6 LAX → DCA Jul 25, 18:55 UTCJul 25, 23:30 UTC4h 35m
2026-07-25 ASA1329 OAK → SEA Jul 25, 16:00 UTCJul 25, 16:55 UTC55m
2026-07-25 ASA634 LAS → SFO Jul 25, 01:40 UTCJul 25, 02:45 UTC1h 5m
2026-07-24 ASA778 SJC → SEA Jul 24, 22:15 UTCJul 25, 00:10 UTC1h 55m
2026-07-24 ASA576 SEA → DFW Jul 24, 18:40 UTCJul 24, 20:30 UTC1h 50m
2026-07-24 ASA577 PDX → SAN Jul 24, 14:55 UTCJul 24, 17:10 UTC2h 15m
2026-07-24 ASA589 DAL → SEA Jul 24, 01:25 UTCJul 24, 03:20 UTC1h 55m
2026-07-23 ASA264 PDX → SJC Jul 23, 22:00 UTCJul 24, 00:15 UTC2h 15m
2026-07-23 ASA1355 SFO → SEA Jul 23, 18:55 UTCJul 23, 20:45 UTC1h 50m
2026-07-23 ASA717 SAN → SFO Jul 23, 14:40 UTCJul 23, 17:00 UTC2h 20m
2026-07-23 ASA665 PDX → ANC Jul 23, 01:05 UTCJul 23, 02:35 UTC1h 30m
2026-07-22 ASA368 SFO → MCO Jul 22, 22:05 UTCJul 22, 23:45 UTC1h 40m
2026-07-22 ASA471 - Jul 22, 17:35 UTCJul 22, 19:40 UTC2h 5m
2026-07-22 ASA471 SNA → SEA Jul 22, 17:50 UTCJul 22, 19:33 UTC1h 43m
2026-07-22 ASA1404 SEA → BZE Jul 22, 14:15 UTCJul 22, 16:20 UTC2h 5m
2026-07-22 ASA1566 BOI → PDX Jul 22, 12:10 UTCJul 22, 13:00 UTC50m
2026-07-22 ASA1524 DTW → SEA Jul 22, 04:45 UTCJul 22, 05:25 UTC40m
2026-07-21 ASA9 DCA → PDX Jul 21, 21:50 UTCJul 22, 03:15 UTC5h 25m
2026-07-21 ASA4 SEA → DCA Jul 21, 15:40 UTCJul 21, 20:05 UTC4h 25m
2026-07-21 ASA454 RSW → SEA Jul 21, 02:05 UTCJul 21, 04:25 UTC2h 20m
2026-07-20 ASA1551 SEA → SNA Jul 20, 22:36 UTCJul 21, 00:39 UTC2h 3m
2026-07-20 ASA1551 SEA → SNA Jul 20, 22:20 UTCJul 21, 00:45 UTC2h 24m
2026-07-20 ASA664 LAS → SEA Jul 20, 19:10 UTCJul 20, 20:45 UTC1h 35m
2026-07-20 ASA360 SEA → SLC Jul 20, 16:20 UTCJul 20, 17:50 UTC1h 30m
2026-07-20 ASA1518 SAN → ORD Jul 20, 02:19 UTCJul 20, 05:06 UTC2h 47m
2026-07-20 ASA1518 SAN → ORD Jul 20, 02:10 UTCJul 20, 05:20 UTC3h 10m
2026-07-20 ASA88 - Jul 20, 00:05 UTCJul 20, 00:45 UTC40m
2026-07-19 ASA89 ANC → ADQ Jul 19, 22:05 UTCJul 19, 22:50 UTC45m
2026-07-19 ASA1810 FAI → ANC Jul 19, 17:45 UTCJul 19, 20:55 UTC3h 10m
2026-07-19 ASA715 EWR → SEA Jul 19, 11:20 UTCJul 19, 15:20 UTC4h 0m
2026-07-18 ASA1784 SAN → ORD Jul 18, 22:35 UTCJul 19, 02:15 UTC3h 40m
2026-07-18 ASA256 BOS → SAN Jul 18, 12:50 UTCJul 18, 18:10 UTC5h 20m
2026-07-18 ASA436 PDX → BOS Jul 18, 05:10 UTCJul 18, 09:50 UTC4h 40m
2026-07-18 ASA1807 DEN → PDX Jul 18, 01:30 UTCJul 18, 03:40 UTC2h 11m
2026-07-17 ASA1809 PDX → DEN Jul 17, 21:55 UTCJul 18, 00:10 UTC2h 15m
2026-07-17 ASA576 - Jul 17, 18:44 UTCJul 17, 20:40 UTC1h 55m
2026-07-17 ASA577 PDX → SAN Jul 17, 15:00 UTCJul 17, 17:20 UTC2h 20m
2026-07-17 ASA1609 ANC → PDX Jul 17, 00:47 UTCJul 17, 03:46 UTC2h 59m
2026-07-17 ASA1609 ANC → PDX Jul 17, 00:30 UTCJul 17, 03:55 UTC3h 25m
2026-07-16 ASA61 - Jul 16, 21:10 UTCJul 16, 21:55 UTC45m
2026-07-16 ASA61 CDV → ANC Jul 16, 19:34 UTCJul 16, 20:03 UTC29m
2026-07-16 ASA61 YAK → CDV Jul 16, 19:20 UTCJul 16, 20:00 UTC40m
2026-07-16 ASA61 - Jul 16, 17:45 UTCJul 16, 18:19 UTC35m
2026-07-16 ASA61 - Jul 16, 14:25 UTCJul 16, 16:25 UTC2h 0m
2026-07-16 ASA234 - Jul 16, 00:45 UTCJul 16, 05:55 UTC5h 10m
2026-07-15 ASA220 - Jul 15, 17:35 UTCJul 15, 23:05 UTC5h 30m
2026-07-14 ASA228 - Jul 14, 21:45 UTCJul 15, 02:45 UTC4h 59m
2026-07-14 ASA228 LIH → SAN Jul 14, 21:42 UTCJul 15, 02:42 UTC5h 0m

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 N568AS page for operator, model, and routing details .

Mode-S A744B3 frequently asked

What is Mode-S code A744B3?
A744B3 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N568AS.
Where is Mode-S A744B3 registered?
Mode-S code A744B3 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 A744B3 broadcasting right now?
Yes. Mode-S A744B3 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A744B3, octal 51642263, decimal 10,962,099.
What flights does A744B3 operate?
Mode-S A744B3 has broadcast 20 distinct callsigns, including ASA740, ASA702, ASA61, ASA60, ASA3.