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sensors Mode-S transponder

A7E8BF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N609AS · BOEING 737-700 · operated by ALASKA AIRLINES INC

Hex
A7E8BF
Octal
51764277
Decimal
11,004,095
Country
US
Tail
N609AS
Type
B737
Broadcasting now · callsign ASA66 · 39,000 ft
Flights observed
455
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Current position

A7E8BF is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A7E8BF 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
ASA62 Alaska Airlines 28 2026-05-29
ASA61 - 28 2026-07-02
ASA70 - 21 2026-07-11
ASA65 - 19 2026-06-16
ASA64 Alaska Airlines 18 2026-06-01
ASA73 - 17 2026-07-11
ASA67 Alaska Airlines 13 2026-06-06
ASA66 - 10 2026-07-14
ASA310 Alaska Airlines 9 2026-06-04
ASA55 - 8 2026-07-09
ASA466 - 8 2026-07-11
ASA43 - 8 2026-07-09
ASA9669 - 7 2026-07-10
ASA51 - 7 2026-07-10
ASA44 - 7 2026-07-09
ASA374 Alaska Airlines 7 2026-06-08
ASA1544 Alaska Airlines 7 2026-07-04
ASA60 - 6 2026-07-01
ASA1528 - 6 2026-07-10
ASA69 - 5 2026-07-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 ASA66 - Jul 14, 00:55 UTCJul 14, 01:20 UTC25m
2026-07-13 ASA66 - Jul 13, 22:45 UTCJul 13, 23:20 UTC35m
2026-07-13 ASA66 ANC → CDV Jul 13, 21:15 UTCJul 13, 21:50 UTC35m
2026-07-13 ASA357 SEA → ANC Jul 13, 16:40 UTCJul 13, 20:05 UTC3h 25m
2026-07-13 AS1554 - Jul 13, 13:15 UTCJul 13, 15:10 UTC1h 55m
2026-07-13 ASA71 - Jul 13, 06:15 UTCJul 13, 08:05 UTC1h 50m
2026-07-13 66 - Jul 13, 02:35 UTCJul 13, 04:45 UTC2h 10m
2026-07-13 ASA66 - Jul 13, 00:50 UTCJul 13, 01:20 UTC30m
2026-07-12 ASA66 CDV → YAK Jul 12, 22:55 UTCJul 12, 23:35 UTC40m
2026-07-12 ASA66 ANC → CDV Jul 12, 21:30 UTCJul 12, 22:05 UTC35m
2026-07-12 ASA357 SEA → ANC Jul 12, 16:55 UTCJul 12, 20:01 UTC3h 5m
2026-07-12 ASA364 GEG → SEA Jul 12, 14:40 UTCJul 12, 15:25 UTC45m
2026-07-12 ASA350 SEA → GEG Jul 12, 06:10 UTCJul 12, 06:45 UTC35m
2026-07-12 ASA371 GEG → SEA Jul 12, 03:01 UTCJul 12, 03:45 UTC45m
2026-07-12 ASA1433 SEA → GEG Jul 12, 01:10 UTCJul 12, 01:45 UTC35m
2026-07-11 ASA1839 - Jul 11, 20:25 UTCJul 11, 23:45 UTC3h 20m
2026-07-11 ASA466 - Jul 11, 18:30 UTCJul 11, 19:20 UTC50m
2026-07-11 ASA466 ANC → FAI Jul 11, 18:27 UTCJul 11, 19:09 UTC42m
2026-07-11 ASA73 - Jul 11, 15:50 UTCJul 11, 17:10 UTC1h 20m
2026-07-11 ASA73 - Jul 11, 14:10 UTCJul 11, 14:30 UTC20m
2026-07-11 ASA70 - Jul 11, 06:30 UTCJul 11, 06:45 UTC15m
2026-07-11 ASA70 - Jul 11, 03:45 UTCJul 11, 05:01 UTC1h 15m
2026-07-10 ASA51 ANC → ANC Jul 10, 22:20 UTCJul 11, 02:35 UTC4h 15m
2026-07-10 ASA1528 OTZ → ANC Jul 10, 19:30 UTCJul 10, 20:40 UTC1h 10m
2026-07-10 ASA1527 ANC → OTZ Jul 10, 17:15 UTCJul 10, 18:30 UTC1h 15m
2026-07-10 AS9669 - Jul 10, 03:55 UTCJul 10, 05:10 UTC1h 15m
2026-07-10 ASA9669 - Jul 10, 01:20 UTCJul 10, 02:35 UTC1h 15m
2026-07-09 ASA44 - Jul 9, 21:25 UTCJul 9, 22:15 UTC50m
2026-07-09 ASA43 - Jul 9, 19:15 UTCJul 9, 20:00 UTC45m
2026-07-09 ASA43 - Jul 9, 19:14 UTCJul 9, 20:13 UTC59m
2026-07-09 ASA55 - Jul 9, 13:50 UTCJul 9, 17:35 UTC3h 45m
2026-07-09 ASA669 SEA → ANC Jul 9, 06:20 UTCJul 9, 09:30 UTC3h 10m
2026-07-09 ASA719 SLC → SEA Jul 9, 03:00 UTCJul 9, 04:40 UTC1h 40m
2026-07-09 ASA373 SEA → SLC Jul 9, 00:00 UTCJul 9, 01:35 UTC1h 35m
2026-07-08 ASA48 - Jul 8, 19:00 UTCJul 8, 21:55 UTC2h 55m
2026-07-08 ASA352 AKN → ANC Jul 8, 01:55 UTCJul 8, 02:45 UTC50m
2026-07-07 ASA351 LAX → SEA Jul 7, 23:40 UTCJul 8, 00:25 UTC45m
2026-07-07 ASA44 - Jul 7, 21:45 UTCJul 7, 22:35 UTC50m
2026-07-07 ASA44 BET → ANC Jul 7, 21:32 UTCJul 7, 22:31 UTC59m
2026-07-07 ASA43 - Jul 7, 19:30 UTCJul 7, 20:15 UTC45m
2026-07-07 ASA55 ANC → ANC Jul 7, 13:40 UTCJul 7, 17:35 UTC3h 55m
2026-07-07 ASA669 SEA → ANC Jul 7, 06:20 UTCJul 7, 09:20 UTC3h 0m
2026-07-07 ASA66 JNU → SEA Jul 7, 02:35 UTCJul 7, 04:45 UTC2h 10m
2026-07-07 ASA66 JNU → SEA Jul 7, 01:00 UTCJul 7, 01:20 UTC20m
2026-07-06 ASA66 JNU → SEA Jul 6, 22:45 UTCJul 6, 23:20 UTC35m
2026-07-06 ASA66 JNU → SEA Jul 6, 21:15 UTCJul 6, 21:50 UTC35m
2026-07-06 ASA357 SEA → ANC Jul 6, 16:55 UTCJul 6, 19:55 UTC3h 0m
2026-07-06 ASA1554 JNU → SEA Jul 6, 13:25 UTCJul 6, 15:25 UTC2h 0m
2026-07-06 ASA1554 JNU → SEA Jul 6, 13:21 UTCJul 6, 15:14 UTC1h 53m
2026-07-06 ASA71 - Jul 6, 04:40 UTCJul 6, 06:40 UTC2h 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 N609AS page for operator, model, and routing details .

Mode-S A7E8BF frequently asked

What is Mode-S code A7E8BF?
A7E8BF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N609AS.
Where is Mode-S A7E8BF registered?
Mode-S code A7E8BF 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 A7E8BF broadcasting right now?
Yes. Mode-S A7E8BF is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A7E8BF, octal 51764277, decimal 11,004,095.
What flights does A7E8BF operate?
Mode-S A7E8BF has broadcast 20 distinct callsigns, including ASA62, ASA61, ASA70, ASA65, ASA64.