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sensors Mode-S transponder

A67B81

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N517AS · BOEING 737-800 · operated by ALASKA AIRLINES INC

Hex
A67B81
Octal
51475601
Decimal
10,910,593
Country
US
Tail
N517AS
Type
B738
Broadcasting now · callsign ASA744 · 7,225 ft
Flights observed
448
Distinct callsigns
20
Country
US
Last broadcast
32m ago

Current position

A67B81 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A67B81 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 - 6 2026-07-03
ASA431 Alaska Airlines 5 2026-06-10
ASA409 Alaska Airlines 5 2026-06-13
ASA224 Alaska Airlines 5 2026-06-10
ASA213 Alaska Airlines 5 2026-06-21
ASA712 Alaska Airlines 4 2026-06-07
ASA588 Alaska Airlines 4 2026-06-07
ASA570 - 4 2026-07-09
ASA549 Alaska Airlines 4 2026-07-03
ASA51 - 4 2026-07-07
ASA508 - 4 2026-06-21
ASA45 - 4 2026-07-07
ASA395 Alaska Airlines 4 2026-04-14
ASA237 - 4 2026-06-21
ASA2 - 4 2026-07-02
ASA1567 Alaska Airlines 4 2026-07-08
ASA1360 Alaska Airlines 4 2026-06-06
ASA1322 - 4 2026-07-14
ASA790 Alaska Airlines 3 2026-07-09
ASA780 - 3 2026-07-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 ASA744 - Jul 15, 00:10 UTCJul 15, 02:15 UTC2h 5m
2026-07-14 ASA1322 - Jul 14, 21:05 UTCJul 14, 22:20 UTC1h 15m
2026-07-14 ASA1321 - Jul 14, 18:20 UTCJul 14, 20:00 UTC1h 40m
2026-07-14 ASA479 LAS → SEA Jul 14, 14:50 UTCJul 14, 16:40 UTC1h 50m
2026-07-14 ASA605 - Jul 14, 01:10 UTCJul 14, 03:30 UTC2h 20m
2026-07-13 ASA674 PHX → PAE Jul 13, 21:35 UTCJul 13, 23:55 UTC2h 20m
2026-07-13 ASA716 PDX → PHX Jul 13, 17:40 UTCJul 13, 20:00 UTC2h 20m
2026-07-13 ASA750 - Jul 13, 14:25 UTCJul 13, 16:15 UTC1h 50m
2026-07-13 ASA631 - Jul 13, 02:45 UTCJul 13, 05:15 UTC2h 30m
2026-07-12 ASA330 - Jul 12, 20:55 UTCJul 12, 22:15 UTC1h 20m
2026-07-12 ASA330 ABQ → SEA Jul 12, 20:52 UTCJul 12, 23:11 UTC2h 19m
2026-07-12 ASA327 SEA → ABQ Jul 12, 17:01 UTCJul 12, 19:35 UTC2h 35m
2026-07-12 ASA701 LAS → SEA Jul 12, 13:30 UTCJul 12, 15:30 UTC2h 0m
2026-07-12 ASA636 SEA → LAS Jul 12, 04:30 UTCJul 12, 06:45 UTC2h 15m
2026-07-11 ASA3 DCA → SEA Jul 11, 21:15 UTCJul 12, 02:30 UTC5h 15m
2026-07-11 ASA10 PDX → DCA Jul 11, 15:05 UTCJul 11, 19:40 UTC4h 35m
2026-07-11 ASA779 LAS → PDX Jul 11, 02:45 UTCJul 11, 04:30 UTC1h 45m
2026-07-11 ASA776 - Jul 11, 00:25 UTCJul 11, 01:35 UTC1h 10m
2026-07-10 ASA41 JFK → SFO Jul 10, 16:55 UTCJul 10, 22:55 UTC6h 0m
2026-07-10 ASA211 - Jul 10, 04:50 UTCJul 10, 09:45 UTC4h 55m
2026-07-10 ASA791 EWR → SEA Jul 10, 01:35 UTCJul 10, 03:15 UTC1h 40m
2026-07-10 ASA791 EWR → SEA Jul 10, 01:35 UTCJul 10, 03:10 UTC1h 35m
2026-07-09 ASA790 SEA → EWR Jul 9, 22:15 UTCJul 9, 23:55 UTC1h 40m
2026-07-09 ASA570 LAS → SFO Jul 9, 18:01 UTCJul 9, 19:03 UTC1h 2m
2026-07-09 ASA570 LAS → SFO Jul 9, 17:55 UTCJul 9, 19:10 UTC1h 15m
2026-07-09 ASA718 SFO → LAS Jul 9, 14:45 UTCJul 9, 15:50 UTC1h 5m
2026-07-09 ASA590 SFO → ORD Jul 9, 04:40 UTCJul 9, 06:20 UTC1h 40m
2026-07-09 ASA296 LAX → SEA Jul 9, 00:35 UTCJul 9, 01:40 UTC1h 5m
2026-07-08 ASA342 - Jul 8, 22:00 UTCJul 8, 23:00 UTC1h 0m
2026-07-08 ASA1567 ANC → PDX Jul 8, 17:25 UTCJul 8, 20:30 UTC3h 5m
2026-07-08 ASA1567 ANC → PDX Jul 8, 17:25 UTCJul 8, 20:40 UTC3h 15m
2026-07-08 ASA1339 - Jul 8, 15:15 UTCJul 8, 15:55 UTC40m
2026-07-08 ASA1612 ANC → FAI Jul 8, 04:45 UTCJul 8, 05:30 UTC45m
2026-07-08 ASA52 BRW → ANC Jul 8, 01:04 UTCJul 8, 02:44 UTC1h 40m
2026-07-07 ASA51 - Jul 7, 22:45 UTCJul 8, 02:15 UTC3h 30m
2026-07-07 ASA1825 PDX → ONT Jul 7, 15:15 UTCJul 7, 21:10 UTC5h 55m
2026-07-07 ASA1543 ANC → ORD Jul 7, 07:25 UTCJul 7, 13:35 UTC6h 10m
2026-07-07 ASA46 - Jul 7, 04:35 UTCJul 7, 05:25 UTC50m
2026-07-07 ASA45 - Jul 7, 02:25 UTCJul 7, 03:10 UTC45m
2026-07-07 ASA45 ANC → BET Jul 7, 02:25 UTCJul 7, 03:24 UTC59m
2026-07-06 ASA1347 FAI → ANC Jul 6, 22:40 UTCJul 6, 23:35 UTC55m
2026-07-06 ASA1336 ANC → FAI Jul 6, 21:00 UTCJul 6, 21:45 UTC45m
2026-07-06 ASA46 - Jul 6, 05:05 UTCJul 6, 06:00 UTC55m
2026-07-06 ASA45 - Jul 6, 03:00 UTCJul 6, 03:40 UTC40m
2026-07-05 ASA660 SEA → ANC Jul 5, 22:15 UTCJul 6, 01:25 UTC3h 10m
2026-07-05 ASA482 BZE → SEA Jul 5, 17:40 UTCJul 5, 19:45 UTC2h 5m
2026-07-04 ASA1604 SFO → LAX Jul 4, 21:50 UTCJul 4, 22:50 UTC1h 0m
2026-07-04 ASA570 LAS → SFO Jul 4, 17:40 UTCJul 4, 18:50 UTC1h 10m
2026-07-04 ASA718 - Jul 4, 14:45 UTCJul 4, 15:55 UTC1h 10m
2026-07-04 ASA291 - Jul 4, 06:00 UTCJul 4, 07:10 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 N517AS page for operator, model, and routing details .

Mode-S A67B81 frequently asked

What is Mode-S code A67B81?
A67B81 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N517AS.
Where is Mode-S A67B81 registered?
Mode-S code A67B81 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 A67B81 broadcasting right now?
Yes. Mode-S A67B81 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A67B81, octal 51475601, decimal 10,910,593.
What flights does A67B81 operate?
Mode-S A67B81 has broadcast 20 distinct callsigns, including ASA1, ASA431, ASA409, ASA224, ASA213.