Apparatus

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sensors Mode-S transponder

A79D78

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N590AS · BOEING 737-800 · operated by ALASKA AIRLINES INC

Hex
A79D78
Octal
51716570
Decimal
10,984,824
Country
US
Tail
N590AS
Type
B738
No current signal · last broadcast Jul 26, 21:35 UTC
Flights observed
363
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:35 UTC

Last known position

Most recent position reported by Mode-S A79D78.

Country allocation

The ICAO 24-bit address A79D78 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
ASA1 Alaska Airlines 5 2026-07-25
ASA6 - 4 2026-07-18
ASA5 - 4 2026-07-19
ASA1618 - 4 2026-07-10
ASA1382 Alaska Airlines 4 2026-04-30
ASA796 - 3 2026-06-18
ASA775 Alaska Airlines 3 2026-07-22
ASA658 - 3 2026-06-27
ASA601 Alaska Airlines 3 2026-07-25
ASA54 - 3 2026-07-16
ASA4 Alaska Airlines 3 2026-06-14
ASA336 - 3 2026-07-13
ASA315 Alaska Airlines 3 2026-07-23
ASA312 - 3 2026-07-09
ASA284 Alaska Airlines 3 2026-07-26
ASA268 Alaska Airlines 3 2026-05-19
ASA251 - 3 2026-06-26
ASA245 Alaska Airlines 3 2026-06-06
ASA234 Alaska Airlines 3 2026-06-08
ASA2 Alaska Airlines 3 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA555 MSP → SEA Jul 26, 20:40 UTCJul 26, 21:35 UTC55m
2026-07-26 ASA555 MSP → SEA Jul 26, 16:40 UTCJul 26, 19:15 UTC2h 35m
2026-07-26 ASA1509 SEA → BUR Jul 26, 08:20 UTCJul 26, 11:35 UTC3h 15m
2026-07-26 ASA1509 SEA → BUR Jul 26, 08:19 UTCJul 26, 11:28 UTC3h 9m
2026-07-26 ASA284 LAX → EWR Jul 26, 02:20 UTCJul 26, 05:30 UTC3h 10m
2026-07-25 ASA601 SEA → SFO Jul 25, 22:15 UTCJul 25, 23:35 UTC1h 20m
2026-07-25 ASA601 SEA → SFO Jul 25, 22:11 UTCJul 25, 23:24 UTC1h 13m
2026-07-25 ASA273 PDX → SFO Jul 25, 19:45 UTCJul 25, 20:50 UTC1h 5m
2026-07-25 ASA1 DCA → SEA Jul 25, 12:25 UTCJul 25, 17:55 UTC5h 30m
2026-07-24 ASA2 SEA → DCA Jul 24, 21:05 UTCJul 25, 01:20 UTC4h 15m
2026-07-24 ASA1311 SEA → SFO Jul 24, 17:45 UTCJul 24, 19:25 UTC1h 40m
2026-07-24 ASA1448 SJC → PVR Jul 24, 14:15 UTCJul 24, 16:10 UTC1h 55m
2026-07-24 ASA1333 PVR → PDX Jul 24, 03:25 UTCJul 24, 05:56 UTC2h 31m
2026-07-24 ASA1333 PVR → PDX Jul 24, 03:15 UTCJul 24, 06:00 UTC2h 45m
2026-07-23 ASA660 PAE → PHX Jul 23, 22:10 UTCJul 24, 01:50 UTC3h 40m
2026-07-23 ASA315 AUS → SEA Jul 23, 17:40 UTCJul 23, 20:35 UTC2h 55m
2026-07-23 ASA224 ANC → PHX Jul 23, 15:00 UTCJul 23, 15:45 UTC45m
2026-07-23 ASA431 LAX → SEA Jul 23, 02:55 UTCJul 23, 03:40 UTC45m
2026-07-23 ASA84 ANC → SEA Jul 23, 00:55 UTCJul 23, 01:50 UTC55m
2026-07-22 ASA89 ANC → ADQ Jul 22, 23:24 UTCJul 22, 23:55 UTC31m
2026-07-22 ASA89 ANC → ADQ Jul 22, 23:15 UTCJul 23, 00:00 UTC45m
2026-07-22 ASA775 PDX → ANC Jul 22, 18:20 UTCJul 22, 22:05 UTC3h 45m
2026-07-22 ASA668 DEN → PDX Jul 22, 14:35 UTCJul 22, 16:40 UTC2h 5m
2026-07-21 ASA1335 BZE → LAX Jul 21, 17:05 UTCJul 21, 20:40 UTC3h 35m
2026-07-20 ASA1335 BZE → LAX Jul 20, 22:05 UTCJul 21, 20:40 UTC22h 35m
2026-07-20 ASA1335 BZE → LAX Jul 20, 20:05 UTCJul 21, 20:00 UTC23h 55m
2026-07-20 ASA1334 LAX → BZE Jul 20, 19:15 UTCJul 21, 18:00 UTC22h 45m
2026-07-19 ASA5 - Jul 19, 14:55 UTCJul 19, 19:30 UTC4h 35m
2026-07-18 ASA6 - Jul 18, 19:05 UTCJul 19, 00:20 UTC5h 15m
2026-07-18 ASA1329 OAK → SEA Jul 18, 15:55 UTCJul 18, 17:00 UTC1h 5m
2026-07-18 ASA791 EWR → SEA Jul 18, 01:20 UTCJul 18, 03:25 UTC2h 6m
2026-07-17 ASA601 SEA → SFO Jul 17, 22:25 UTCJul 17, 23:45 UTC1h 20m
2026-07-17 ASA273 PDX → SFO Jul 17, 19:05 UTCJul 17, 20:25 UTC1h 20m
2026-07-17 ASA1 DCA → SEA Jul 17, 12:29 UTCJul 17, 17:00 UTC4h 31m
2026-07-17 ASA1 DCA → SEA Jul 17, 12:10 UTCJul 17, 17:15 UTC5h 5m
2026-07-16 ASA2 SEA → DCA Jul 16, 22:49 UTCJul 17, 03:20 UTC4h 30m
2026-07-16 ASA656 - Jul 16, 18:55 UTCJul 16, 20:49 UTC1h 55m
2026-07-16 ASA725 SEA → SFO Jul 16, 15:05 UTCJul 16, 17:00 UTC1h 55m
2026-07-16 ASA54 ANC → SEA Jul 16, 09:50 UTCJul 16, 12:40 UTC2h 50m
2026-07-16 ASA54 ANC → SEA Jul 16, 09:46 UTCJul 16, 12:44 UTC2h 58m
2026-07-16 ASA1560 - Jul 16, 05:39 UTCJul 16, 08:37 UTC2h 58m
2026-07-16 ASA1560 SEA → ANC Jul 16, 05:30 UTCJul 16, 08:40 UTC3h 10m
2026-07-16 ASA665 SLC → SEA Jul 16, 02:20 UTCJul 16, 04:05 UTC1h 45m
2026-07-15 ASA368 SEA → SLC Jul 15, 22:10 UTCJul 15, 23:50 UTC1h 40m
2026-07-15 ASA315 ANC → SEA Jul 15, 17:24 UTCJul 15, 20:17 UTC2h 53m
2026-07-15 ASA315 - Jul 15, 17:20 UTCJul 15, 20:25 UTC3h 5m
2026-07-15 ASA1339 - Jul 15, 15:10 UTCJul 15, 15:50 UTC40m
2026-07-15 ASA1612 - Jul 15, 04:45 UTCJul 15, 05:25 UTC40m
2026-07-15 ASA1612 ANC → FAI Jul 15, 04:44 UTCJul 15, 05:26 UTC42m
2026-07-15 ASA352 - Jul 15, 02:00 UTCJul 15, 03:00 UTC1h 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 N590AS page for operator, model, and routing details .

Mode-S A79D78 frequently asked

What is Mode-S code A79D78?
A79D78 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N590AS.
Where is Mode-S A79D78 registered?
Mode-S code A79D78 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 A79D78 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A79D78, octal 51716570, decimal 10,984,824.
What flights does A79D78 operate?
Mode-S A79D78 has broadcast 20 distinct callsigns, including ASA1, ASA6, ASA5, ASA1618, ASA1382.