Apparatus

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sensors Mode-S transponder

AD8ED4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N973AK · BOEING 737 MAX 9 · operated by ALASKA AIRLINES INC

Hex
AD8ED4
Octal
53307324
Decimal
11,374,292
Country
US
Tail
N973AK
Type
B39M
No current signal · last broadcast Jul 26, 23:00 UTC
Flights observed
437
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 23:00 UTC

Last known position

Most recent position reported by Mode-S AD8ED4.

Country allocation

The ICAO 24-bit address AD8ED4 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
ASA270 Alaska Airlines 6 2026-05-15
ASA206 Alaska Airlines 6 2026-07-22
ASA19 - 6 2026-06-21
ASA351 Alaska Airlines 5 2026-04-13
ASA271 Alaska Airlines 5 2026-05-16
ASA204 Alaska Airlines 5 2026-05-06
ASA1421 Alaska Airlines 5 2026-05-27
ASA781 Alaska Airlines 4 2026-06-18
ASA739 - 4 2026-07-17
ASA655 Alaska Airlines 4 2026-07-23
ASA625 Alaska Airlines 4 2026-05-17
ASA561 Alaska Airlines 4 2026-05-07
ASA413 - 4 2026-06-26
ASA328 - 4 2026-06-26
ASA294 - 4 2026-06-24
ASA246 - 4 2026-07-14
ASA202 - 4 2026-07-14
ASA1340 - 4 2026-06-20
ASA1302 Alaska Airlines 4 2026-07-23
ASA757 Alaska Airlines 3 2026-06-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA465 LAX → SJD Jul 26, 22:30 UTCJul 26, 23:00 UTC30m
2026-07-26 ASA467 SFO → ZIH Jul 26, 18:25 UTCJul 26, 20:55 UTC2h 30m
2026-07-26 ASA302 SJC → LIH Jul 26, 11:55 UTCJul 26, 16:20 UTC4h 25m
2026-07-26 ASA298 LAX → AUS Jul 26, 05:25 UTCJul 26, 08:55 UTC3h 31m
2026-07-25 ASA456 SFO → ORD Jul 25, 22:35 UTCJul 26, 00:40 UTC2h 5m
2026-07-25 ASA209 LAX → SFO Jul 25, 19:15 UTCJul 25, 21:10 UTC1h 55m
2026-07-25 ASA591 CUN → SFO Jul 25, 04:35 UTCJul 25, 06:00 UTC1h 25m
2026-07-25 ASA591 CUN → SFO Jul 25, 04:34 UTCJul 25, 05:51 UTC1h 17m
2026-07-25 ASA504 OAK → SEA Jul 25, 01:35 UTCJul 25, 03:05 UTC1h 30m
2026-07-24 ASA1600 SFO → LAS Jul 24, 23:02 UTCJul 25, 00:07 UTC1h 5m
2026-07-24 ASA1600 SFO → LAS Jul 24, 23:05 UTCJul 25, 00:05 UTC1h 0m
2026-07-24 ASA1428 SFO → SJD Jul 24, 20:10 UTCJul 24, 21:35 UTC1h 25m
2026-07-24 ASA348 SEA → IAD Jul 24, 13:15 UTCJul 24, 18:05 UTC4h 50m
2026-07-24 ASA464 FAI → ANC Jul 24, 07:05 UTCJul 24, 11:10 UTC4h 5m
2026-07-24 ASA403 LAS → SEA Jul 24, 04:26 UTCJul 24, 05:25 UTC59m
2026-07-24 ASA403 LAS → SEA Jul 24, 04:15 UTCJul 24, 05:35 UTC1h 20m
2026-07-24 ASA1622 PDX → SMF Jul 24, 01:55 UTCJul 24, 03:05 UTC1h 10m
2026-07-23 ASA1302 SEA → LAX Jul 23, 23:25 UTCJul 24, 00:40 UTC1h 15m
2026-07-23 ASA1302 SEA → LAX Jul 23, 23:27 UTCJul 24, 00:35 UTC1h 8m
2026-07-23 ASA655 ABQ → SEA Jul 23, 21:50 UTCJul 23, 22:00 UTC10m
2026-07-23 ASA655 ABQ → SEA Jul 23, 19:53 UTCJul 23, 21:34 UTC1h 41m
2026-07-23 ASA655 ABQ → SEA Jul 23, 19:55 UTCJul 23, 22:00 UTC2h 5m
2026-07-23 ASA82 ANC → SEA Jul 23, 15:08 UTCJul 23, 17:48 UTC2h 40m
2026-07-23 ASA82 ANC → SEA Jul 23, 15:10 UTCJul 23, 18:05 UTC2h 55m
2026-07-23 ASA1545 ORD → ANC Jul 23, 06:55 UTCJul 23, 13:30 UTC6h 35m
2026-07-23 ASA1493 SAN → ORD Jul 23, 01:30 UTCJul 23, 04:40 UTC3h 10m
2026-07-23 ASA1493 SAN → ORD Jul 23, 01:25 UTCJul 23, 05:00 UTC3h 35m
2026-07-22 ASA551 PHL → SEA Jul 22, 20:30 UTCJul 22, 22:55 UTC2h 25m
2026-07-22 ASA340 SFO → EWR Jul 22, 15:13 UTCJul 22, 18:26 UTC3h 13m
2026-07-22 ASA340 SFO → EWR Jul 22, 15:00 UTCJul 22, 18:40 UTC3h 40m
2026-07-22 ASA206 PDX → SFO Jul 22, 01:10 UTCJul 22, 12:55 UTC11h 45m
2026-07-21 ASA1633 SJC → PDX Jul 21, 21:55 UTCJul 21, 23:15 UTC1h 20m
2026-07-21 ASA1632 PDX → SJC Jul 21, 19:10 UTCJul 21, 20:40 UTC1h 30m
2026-07-21 ASA1397 CUN → SAN Jul 21, 02:05 UTCJul 21, 03:50 UTC1h 45m
2026-07-20 ASA1523 LAX → SJO Jul 20, 23:50 UTCJul 21, 00:50 UTC1h 0m
2026-07-20 ASA680 SEA → SFO Jul 20, 20:50 UTCJul 20, 22:40 UTC1h 50m
2026-07-20 ASA1468 SEA → LAX Jul 20, 17:50 UTCJul 20, 19:10 UTC1h 20m
2026-07-20 ASA682 SEA → DEN Jul 20, 14:55 UTCJul 20, 16:25 UTC1h 30m
2026-07-20 ASA98 ADQ → ANC Jul 20, 10:10 UTCJul 20, 13:15 UTC3h 5m
2026-07-20 ASA667 - Jul 20, 04:05 UTCJul 20, 07:00 UTC2h 55m
2026-07-20 ASA667 SEA → ANC Jul 20, 03:53 UTCJul 20, 07:03 UTC3h 10m
2026-07-19 ASA289 PHX → SEA Jul 19, 23:10 UTCJul 20, 01:35 UTC2h 25m
2026-07-19 ASA1371 SEA → PHX Jul 19, 19:15 UTCJul 19, 21:55 UTC2h 40m
2026-07-19 ASA348 ATL → SEA Jul 19, 13:10 UTCJul 19, 17:45 UTC4h 35m
2026-07-18 ASA727 SEA → ATL Jul 18, 23:25 UTCJul 19, 03:40 UTC4h 15m
2026-07-18 ASA676 LAS → SEA Jul 18, 19:25 UTCJul 18, 21:25 UTC2h 0m
2026-07-18 ASA1628 PDX → LAS Jul 18, 16:10 UTCJul 18, 18:10 UTC2h 0m
2026-07-18 ASA1490 - Jul 18, 01:15 UTCJul 18, 02:05 UTC50m
2026-07-17 ASA739 - Jul 17, 14:30 UTCJul 17, 15:15 UTC45m
2026-07-17 ASA739 PDX → OGG Jul 17, 14:25 UTCJul 17, 19:25 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 N973AK page for operator, model, and routing details .

Mode-S AD8ED4 frequently asked

What is Mode-S code AD8ED4?
AD8ED4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N973AK.
Where is Mode-S AD8ED4 registered?
Mode-S code AD8ED4 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 AD8ED4 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 23:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AD8ED4, octal 53307324, decimal 11,374,292.
What flights does AD8ED4 operate?
Mode-S AD8ED4 has broadcast 20 distinct callsigns, including ASA270, ASA206, ASA19, ASA351, ASA271.