Apparatus

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sensors Mode-S transponder

A81DBC

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N622AS · BOEING 737-700 · operated by ALASKA AIRLINES INC

Hex
A81DBC
Octal
52016674
Decimal
11,017,660
Country
US
Tail
N622AS
Type
B737
No current signal · last broadcast 58m ago
Flights observed
559
Distinct callsigns
20
Country
US
Last broadcast
58m ago

Last known position

Most recent position reported by Mode-S A81DBC.

Country allocation

The ICAO 24-bit address A81DBC 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
ASA65 - 45 2026-06-26
ASA66 - 38 2026-07-12
ASA61 - 34 2026-07-12
ASA70 - 26 2026-06-28
ASA73 - 24 2026-06-28
ASA62 Alaska Airlines 20 2026-06-03
ASA60 - 18 2026-07-13
ASA69 - 16 2026-07-13
ASA67 Alaska Airlines 15 2026-06-03
ASA697 - 13 2026-07-05
ASA64 - 12 2026-06-30
ASA43 - 11 2026-07-03
ASA155 Alaska Airlines 8 2026-04-20
ASA71 - 7 2026-07-10
ASA362 Alaska Airlines 7 2026-05-04
ASA350 - 7 2026-07-11
ASA219 Alaska Airlines 7 2026-05-29
ASA435 - 6 2026-07-13
ASA288 Alaska Airlines 6 2026-05-03
ASA272 - 6 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 ASA766 - Jul 14, 02:10 UTCJul 14, 02:20 UTC10m
2026-07-13 ASA435 - Jul 13, 20:55 UTCJul 13, 22:50 UTC1h 55m
2026-07-13 ASA60 - Jul 13, 17:25 UTCJul 13, 19:00 UTC1h 35m
2026-07-13 ASA60 KTN → SEA Jul 13, 17:33 UTCJul 13, 18:44 UTC1h 11m
2026-07-13 60 - Jul 13, 15:40 UTCJul 13, 16:10 UTC30m
2026-07-13 ASA69 - Jul 13, 07:20 UTCJul 13, 07:55 UTC35m
2026-07-13 ASA69 - Jul 13, 04:59 UTCJul 13, 06:34 UTC1h 35m
2026-07-13 ASA69 - Jul 13, 05:01 UTCJul 13, 06:25 UTC1h 25m
2026-07-12 ASA272 ANC → SEA Jul 12, 23:55 UTCJul 13, 03:05 UTC3h 10m
2026-07-12 ASA61 - Jul 12, 21:10 UTCJul 12, 21:50 UTC40m
2026-07-12 ASA61 YAK → CDV Jul 12, 19:10 UTCJul 12, 19:45 UTC35m
2026-07-12 ASA61 - Jul 12, 17:30 UTCJul 12, 18:10 UTC40m
2026-07-12 ASA61 SEA → FNR Jul 12, 14:20 UTCJul 12, 16:20 UTC2h 0m
2026-07-12 ASA66 - Jul 12, 02:40 UTCJul 12, 04:40 UTC2h 0m
2026-07-12 ASA66 - Jul 12, 00:35 UTCJul 12, 01:05 UTC30m
2026-07-11 ASA66 - Jul 11, 22:45 UTCJul 11, 23:20 UTC35m
2026-07-11 ASA66 ANC → CDV Jul 11, 21:20 UTCJul 11, 21:55 UTC35m
2026-07-11 ASA357 SEA → ANC Jul 11, 17:05 UTCJul 11, 20:10 UTC3h 5m
2026-07-11 ASA357 SEA → ANC Jul 11, 17:05 UTCJul 11, 20:09 UTC3h 4m
2026-07-11 ASA364 GEG → SEA Jul 11, 14:30 UTCJul 11, 15:15 UTC45m
2026-07-11 ASA350 SEA → GEG Jul 11, 06:35 UTCJul 11, 07:15 UTC40m
2026-07-11 ASA66 - Jul 11, 02:40 UTCJul 11, 04:45 UTC2h 5m
2026-07-11 ASA66 - Jul 11, 00:40 UTCJul 11, 01:10 UTC30m
2026-07-10 ASA66 - Jul 10, 22:50 UTCJul 10, 23:30 UTC40m
2026-07-10 ASA66 ANC → CDV Jul 10, 21:25 UTCJul 10, 22:00 UTC35m
2026-07-10 ASA357 SEA → ANC Jul 10, 16:40 UTCJul 10, 19:40 UTC3h 0m
2026-07-10 1554 - Jul 10, 13:10 UTCJul 10, 15:10 UTC2h 0m
2026-07-10 ASA71 - Jul 10, 05:05 UTCJul 10, 06:55 UTC1h 50m
2026-07-10 ASA774 - Jul 10, 00:40 UTCJul 10, 02:55 UTC2h 15m
2026-07-10 ASA774 SNA → SEA Jul 10, 00:40 UTCJul 10, 02:45 UTC2h 5m
2026-07-09 ASA773 - Jul 9, 21:40 UTCJul 9, 23:50 UTC2h 10m
2026-07-09 ASA773 SEA → SNA Jul 9, 21:35 UTCJul 9, 23:49 UTC2h 14m
2026-07-09 ASA765 ANC → SEA Jul 9, 16:40 UTCJul 9, 19:40 UTC3h 0m
2026-07-09 ASA1544 ANC → OME Jul 9, 02:05 UTCJul 9, 03:20 UTC1h 15m
2026-07-08 ASA1544 ANC → OME Jul 8, 23:35 UTCJul 9, 00:35 UTC1h 0m
2026-07-08 ASA1415 FAI → ANC Jul 8, 21:35 UTCJul 8, 22:20 UTC45m
2026-07-08 ASA1552 SEA → FAI Jul 8, 17:10 UTCJul 8, 20:30 UTC3h 20m
2026-07-08 ASA1554 JNU → SEA Jul 8, 13:10 UTCJul 8, 15:00 UTC1h 50m
2026-07-08 ASA71 - Jul 8, 04:40 UTCJul 8, 06:35 UTC1h 55m
2026-07-07 ASA364 GEG → SEA Jul 7, 15:15 UTCJul 7, 16:00 UTC45m
2026-07-07 ASA350 SEA → GEG Jul 7, 08:00 UTCJul 7, 09:05 UTC1h 5m
2026-07-05 ASA697 - Jul 5, 23:35 UTCJul 6, 00:40 UTC1h 5m
2026-07-05 ASA697 - Jul 5, 21:20 UTCJul 5, 22:15 UTC55m
2026-07-04 ASA697 - Jul 4, 23:00 UTCJul 5, 00:00 UTC1h 0m
2026-07-04 ASA697 - Jul 4, 20:50 UTCJul 4, 21:30 UTC40m
2026-07-04 ASA796 - Jul 4, 17:30 UTCJul 4, 19:10 UTC1h 40m
2026-07-04 ASA292 SEA → SLC Jul 4, 14:25 UTCJul 4, 15:55 UTC1h 30m
2026-07-04 ASA221 ANC → SEA Jul 4, 08:35 UTCJul 4, 11:25 UTC2h 50m
2026-07-04 ASA1613 - Jul 4, 03:15 UTCJul 4, 04:40 UTC1h 25m
2026-07-04 ASA1537 - Jul 4, 00:25 UTCJul 4, 01:35 UTC1h 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 N622AS page for operator, model, and routing details .

Mode-S A81DBC frequently asked

What is Mode-S code A81DBC?
A81DBC is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N622AS.
Where is Mode-S A81DBC registered?
Mode-S code A81DBC 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 A81DBC broadcasting right now?
No active broadcast right now. Last signal was 58m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A81DBC, octal 52016674, decimal 11,017,660.
What flights does A81DBC operate?
Mode-S A81DBC has broadcast 20 distinct callsigns, including ASA65, ASA66, ASA61, ASA70, ASA73.