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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
No current signal · last broadcast Jul 25, 04:45 UTC
Flights observed
490
Distinct callsigns
20
Country
US
Last broadcast
Jul 25, 04:45 UTC

Last known position

Most recent position reported by Mode-S A67B81.

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
ASA1322 - 7 2026-07-16
ASA1 Alaska Airlines 7 2026-07-18
ASA549 Alaska Airlines 6 2026-07-18
ASA213 - 6 2026-07-20
ASA431 Alaska Airlines 5 2026-06-10
ASA409 Alaska Airlines 5 2026-06-13
ASA224 Alaska Airlines 5 2026-06-10
ASA2 Alaska Airlines 5 2026-07-17
ASA1321 - 5 2026-07-16
ASA780 - 4 2026-07-19
ASA712 Alaska Airlines 4 2026-06-07
ASA599 - 4 2026-07-17
ASA588 Alaska Airlines 4 2026-06-07
ASA570 - 4 2026-07-09
ASA51 - 4 2026-07-07
ASA508 - 4 2026-06-21
ASA45 - 4 2026-07-07
ASA395 Alaska Airlines 4 2026-04-14
ASA278 Alaska Airlines 4 2026-07-22
ASA237 - 4 2026-06-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 ASA556 SFO → IAD Jul 25, 02:10 UTCJul 25, 04:45 UTC2h 35m
2026-07-24 ASA734 PHX → PAE Jul 24, 23:00 UTCJul 25, 00:40 UTC1h 40m
2026-07-24 ASA733 LAS → SEA Jul 24, 20:00 UTCJul 24, 21:50 UTC1h 50m
2026-07-22 ASA748 SFO → LAS Jul 22, 21:50 UTCJul 22, 23:50 UTC2h 0m
2026-07-22 ASA278 FAI → ANC Jul 22, 00:57 UTCJul 22, 02:56 UTC1h 59m
2026-07-22 ASA278 FAI → ANC Jul 22, 01:00 UTCJul 22, 03:10 UTC2h 10m
2026-07-21 ASA1600 SFO → LAS Jul 21, 22:10 UTCJul 21, 23:20 UTC1h 10m
2026-07-21 ASA1428 SFO → SJD Jul 21, 19:40 UTCJul 21, 21:05 UTC1h 25m
2026-07-21 ASA317 DEN → SEA Jul 21, 14:50 UTCJul 21, 17:10 UTC2h 20m
2026-07-21 ASA1627 PDX → DEN Jul 21, 01:10 UTCJul 21, 03:20 UTC2h 10m
2026-07-20 ASA686 SFO → LAS Jul 20, 23:20 UTCJul 21, 00:00 UTC39m
2026-07-20 ASA686 SFO → LAS Jul 20, 23:20 UTCJul 20, 23:52 UTC32m
2026-07-20 ASA548 MZT → SFO Jul 20, 19:25 UTCJul 20, 21:35 UTC2h 10m
2026-07-20 ASA759 SFO → LAS Jul 20, 15:45 UTCJul 20, 18:10 UTC2h 25m
2026-07-20 ASA213 SEA → SEA Jul 20, 01:50 UTCJul 20, 14:10 UTC12h 20m
2026-07-19 ASA1338 - Jul 19, 19:55 UTCJul 19, 22:25 UTC2h 30m
2026-07-19 ASA455 RSW → SEA Jul 19, 14:20 UTCJul 19, 16:10 UTC1h 50m
2026-07-19 ASA455 RSW → SEA Jul 19, 14:27 UTCJul 19, 17:05 UTC2h 38m
2026-07-19 ASA291 MCI → SEA Jul 19, 05:00 UTCJul 19, 06:00 UTC1h 0m
2026-07-19 ASA780 DFW → SAN Jul 19, 00:40 UTCJul 19, 03:20 UTC2h 40m
2026-07-18 ASA549 ZIH → SFO Jul 18, 19:41 UTCJul 18, 23:12 UTC3h 31m
2026-07-18 ASA549 ZIH → SFO Jul 18, 19:40 UTCJul 18, 23:10 UTC3h 30m
2026-07-18 ASA1 DCA → SEA Jul 18, 12:10 UTCJul 18, 17:30 UTC5h 20m
2026-07-17 ASA2 SEA → DCA Jul 17, 21:30 UTCJul 18, 01:54 UTC4h 25m
2026-07-17 ASA1311 SJC → SEA Jul 17, 17:25 UTCJul 17, 18:55 UTC1h 30m
2026-07-17 ASA1448 SEA → SJC Jul 17, 14:35 UTCJul 17, 16:21 UTC1h 46m
2026-07-17 ASA1448 SEA → SJC Jul 17, 14:30 UTCJul 17, 16:19 UTC1h 50m
2026-07-17 ASA599 - Jul 17, 03:39 UTCJul 17, 05:04 UTC1h 25m
2026-07-17 ASA598 SEA → RNO Jul 17, 01:03 UTCJul 17, 02:23 UTC1h 20m
2026-07-17 ASA598 - Jul 17, 01:05 UTCJul 17, 02:10 UTC1h 5m
2026-07-16 ASA1322 BFI → SEA Jul 16, 23:15 UTCJul 16, 23:20 UTC5m
2026-07-16 ASA1322 - Jul 16, 21:45 UTCJul 16, 23:20 UTC1h 35m
2026-07-16 ASA1322 STS → SEA Jul 16, 21:44 UTCJul 16, 23:00 UTC1h 16m
2026-07-16 ASA1321 - Jul 16, 18:40 UTCJul 16, 20:15 UTC1h 35m
2026-07-16 ASA1321 SEA → STS Jul 16, 18:13 UTCJul 16, 20:17 UTC2h 4m
2026-07-16 ASA543 DFW → SEA Jul 16, 11:45 UTCJul 16, 15:14 UTC3h 30m
2026-07-16 ASA542 SEA → DFW Jul 16, 06:30 UTCJul 16, 09:55 UTC3h 25m
2026-07-16 ASA454 - Jul 16, 02:00 UTCJul 16, 04:10 UTC2h 10m
2026-07-15 ASA1551 - Jul 15, 22:25 UTCJul 16, 00:55 UTC2h 30m
2026-07-15 ASA471 - Jul 15, 17:55 UTCJul 15, 19:55 UTC2h 0m
2026-07-15 ASA1404 - Jul 15, 14:25 UTCJul 15, 16:40 UTC2h 15m
2026-07-15 ASA650 PHX → PDX Jul 15, 04:00 UTCJul 15, 06:10 UTC2h 10m
2026-07-15 ASA744 SEA → PHX Jul 15, 00:10 UTCJul 15, 02:55 UTC2h 45m
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

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?
No active broadcast right now. Last signal was Jul 25, 04:45 UTC.
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 ASA1322, ASA1, ASA549, ASA213, ASA431.