Apparatus

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sensors Mode-S transponder

ADB653

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N983AK · BOEING 737 MAX 9 · operated by ALASKA AIRLINES INC

Hex
ADB653
Octal
53333123
Decimal
11,384,403
Country
US
Tail
N983AK
Type
B39M
No current signal · last broadcast 2d ago
Flights observed
396
Distinct callsigns
20
Country
US
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S ADB653.

Country allocation

The ICAO 24-bit address ADB653 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
ASA795 Alaska Airlines 5 2026-07-26
ASA705 Alaska Airlines 5 2026-05-09
ASA421 Alaska Airlines 5 2026-07-26
ASA295 - 5 2026-07-16
ASA1351 - 5 2026-07-12
ASA658 - 4 2026-07-03
ASA502 - 4 2026-07-11
ASA259 Alaska Airlines 4 2026-07-21
ASA238 Alaska Airlines 4 2026-07-21
ASA1411 - 4 2026-07-13
ASA706 Alaska Airlines 3 2026-05-09
ASA684 Alaska Airlines 3 2026-04-29
ASA569 - 3 2026-07-20
ASA560 Alaska Airlines 3 2026-06-07
ASA475 - 3 2026-07-20
ASA418 Alaska Airlines 3 2026-04-22
ASA373 Alaska Airlines 3 2026-07-22
ASA331 Alaska Airlines 3 2026-05-21
ASA329 Alaska Airlines 3 2026-05-30
ASA286 - 3 2026-06-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA421 PDX → SFO Jul 26, 18:33 UTCJul 26, 22:13 UTC3h 40m
2026-07-26 ASA421 PDX → SFO Jul 26, 18:20 UTCJul 26, 20:45 UTC2h 25m
2026-07-26 ASA795 DEN → PDX Jul 26, 14:55 UTCJul 26, 16:20 UTC1h 25m
2026-07-26 ASA638 SEA → TUS Jul 26, 02:45 UTCJul 26, 04:10 UTC1h 25m
2026-07-25 ASA652 RNO → SEA Jul 25, 22:20 UTCJul 26, 00:10 UTC1h 50m
2026-07-25 ASA652 RNO → SEA Jul 25, 22:14 UTCJul 26, 00:03 UTC1h 49m
2026-07-25 ASA633 SAN → SEA Jul 25, 19:00 UTCJul 25, 20:40 UTC1h 40m
2026-07-25 ASA795 DEN → PDX Jul 25, 17:15 UTCJul 25, 17:20 UTC5m
2026-07-25 ASA795 DEN → PDX Jul 25, 15:49 UTCJul 25, 16:59 UTC1h 10m
2026-07-25 ASA795 DEN → PDX Jul 25, 15:50 UTCJul 25, 17:20 UTC1h 30m
2026-07-25 ASA1621 SAN → SMF Jul 25, 05:10 UTCJul 25, 06:15 UTC1h 5m
2026-07-25 ASA1388 LAX → SJD Jul 25, 01:25 UTCJul 25, 03:45 UTC2h 20m
2026-07-24 ASA585 LAX → SEA Jul 24, 21:30 UTCJul 24, 23:40 UTC2h 10m
2026-07-24 ASA1367 PVR → SFO Jul 24, 17:55 UTCJul 24, 20:10 UTC2h 15m
2026-07-24 ASA68 ANC → PHX Jul 24, 14:30 UTCJul 24, 16:00 UTC1h 30m
2026-07-23 ASA1561 ANC → SFO Jul 23, 22:45 UTCJul 24, 02:50 UTC4h 5m
2026-07-23 ASA775 PDX → ANC Jul 23, 17:45 UTCJul 23, 21:10 UTC3h 25m
2026-07-22 ASA1350 SEA → SFO Jul 22, 22:05 UTCJul 23, 02:20 UTC4h 15m
2026-07-22 ASA1345 SJD → SFO Jul 22, 16:40 UTCJul 22, 20:25 UTC3h 45m
2026-07-22 ASA1345 SJD → SFO Jul 22, 16:37 UTCJul 22, 20:13 UTC3h 36m
2026-07-22 ASA1444 SFO → CUN Jul 22, 12:35 UTCJul 22, 14:15 UTC1h 40m
2026-07-22 ASA373 SJC → SJD Jul 22, 00:05 UTCJul 22, 01:40 UTC1h 35m
2026-07-22 ASA373 SJC → SJD Jul 22, 00:01 UTCJul 22, 01:33 UTC1h 32m
2026-07-21 ASA656 SFO → SEA Jul 21, 19:05 UTCJul 21, 20:40 UTC1h 35m
2026-07-21 ASA725 LAS → PDX Jul 21, 15:55 UTCJul 21, 17:40 UTC1h 45m
2026-07-21 ASA259 SJD → SJC Jul 21, 07:39 UTCJul 21, 12:18 UTC4h 39m
2026-07-21 ASA259 SJD → SJC Jul 21, 07:25 UTCJul 21, 12:25 UTC5h 0m
2026-07-21 ASA238 SFO → LAS Jul 21, 04:30 UTCJul 21, 04:50 UTC20m
2026-07-20 ASA238 SFO → LAS Jul 20, 23:10 UTCJul 21, 00:00 UTC50m
2026-07-20 ASA475 SAN → SEA Jul 20, 19:04 UTCJul 20, 21:10 UTC2h 6m
2026-07-20 ASA475 - Jul 20, 19:05 UTCJul 20, 21:15 UTC2h 10m
2026-07-20 ASA1471 SEA → SAN Jul 20, 15:18 UTCJul 20, 17:21 UTC2h 3m
2026-07-20 ASA1471 SEA → SAN Jul 20, 15:00 UTCJul 20, 17:30 UTC2h 30m
2026-07-20 ASA569 - Jul 20, 00:45 UTCJul 20, 05:15 UTC4h 30m
2026-07-20 ASA569 MSY → SEA Jul 20, 01:00 UTCJul 20, 05:05 UTC4h 5m
2026-07-19 ASA568 SJC → SEA Jul 19, 16:55 UTCJul 19, 21:00 UTC4h 5m
2026-07-19 ASA620 SEA → DEN Jul 19, 13:20 UTCJul 19, 14:50 UTC1h 30m
2026-07-19 ASA619 SEA → SFO Jul 19, 03:55 UTCJul 19, 05:34 UTC1h 39m
2026-07-19 ASA619 SEA → SFO Jul 19, 03:55 UTCJul 19, 05:45 UTC1h 50m
2026-07-18 ASA1574 DFW → SEA Jul 18, 21:50 UTCJul 19, 01:25 UTC3h 35m
2026-07-18 ASA545 - Jul 18, 17:15 UTCJul 18, 19:50 UTC2h 35m
2026-07-18 ASA1470 ORD → SAN Jul 18, 12:10 UTCJul 18, 15:10 UTC3h 0m
2026-07-18 ASA1470 - Jul 18, 11:45 UTCJul 18, 12:45 UTC1h 0m
2026-07-18 ASA376 PDX → ORD Jul 18, 06:10 UTCJul 18, 09:35 UTC3h 25m
2026-07-18 ASA253 - Jul 18, 02:25 UTCJul 18, 03:15 UTC51m
2026-07-17 ASA253 - Jul 17, 22:10 UTCJul 17, 22:25 UTC15m
2026-07-17 ASA252 PDX → KOA Jul 17, 15:25 UTCJul 17, 20:50 UTC5h 25m
2026-07-16 ASA301 MCO → PDX Jul 16, 22:30 UTCJul 17, 03:34 UTC5h 5m
2026-07-16 ASA295 SEA → MCO Jul 16, 15:14 UTCJul 16, 21:10 UTC5h 55m
2026-07-16 ASA259 - Jul 16, 11:40 UTCJul 16, 12:34 UTC55m

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 N983AK page for operator, model, and routing details .

Mode-S ADB653 frequently asked

What is Mode-S code ADB653?
ADB653 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N983AK.
Where is Mode-S ADB653 registered?
Mode-S code ADB653 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 ADB653 broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ADB653, octal 53333123, decimal 11,384,403.
What flights does ADB653 operate?
Mode-S ADB653 has broadcast 20 distinct callsigns, including ASA795, ASA705, ASA421, ASA295, ASA1351.