Apparatus

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sensors Mode-S transponder

A7F9F4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N613AS · BOEING 737-700 · operated by ALASKA AIRLINES INC

Hex
A7F9F4
Octal
51774764
Decimal
11,008,500
Country
US
Tail
N613AS
Type
B737
No current signal · last broadcast Jul 26, 23:00 UTC
Flights observed
642
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 23:00 UTC

Last known position

Most recent position reported by Mode-S A7F9F4.

Country allocation

The ICAO 24-bit address A7F9F4 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
ASA61 - 59 2026-07-19
ASA65 Alaska Airlines 40 2026-07-22
ASA62 Alaska Airlines 31 2026-06-07
ASA66 Alaska Airlines 30 2026-07-25
ASA64 Alaska Airlines 23 2026-05-26
ASA69 Alaska Airlines 20 2026-07-18
ASA70 - 19 2026-07-12
ASA60 Alaska Airlines 19 2026-07-18
ASA73 - 18 2026-07-12
ASA697 - 14 2026-07-17
ASA67 Alaska Airlines 13 2026-06-07
ASA87 Alaska Airlines 10 2026-07-23
ASA310 Alaska Airlines 10 2026-06-05
ASA1544 Alaska Airlines 10 2026-07-26
ASA55 Alaska Airlines 9 2026-07-21
ASA1528 Alaska Airlines 9 2026-07-26
ASA86 Alaska Airlines 8 2026-07-23
ASA445 - 8 2026-07-19
ASA374 Alaska Airlines 8 2026-06-03
ASA229 Alaska Airlines 8 2026-06-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA754 SJC → SEA Jul 26, 22:45 UTCJul 26, 23:00 UTC15m
2026-07-26 ASA1528 SEA → BUR Jul 26, 19:25 UTCJul 26, 20:45 UTC1h 20m
2026-07-26 ASA1527 ANC → OTZ Jul 26, 17:19 UTCJul 26, 18:20 UTC1h 1m
2026-07-26 ASA1527 ANC → OTZ Jul 26, 17:00 UTCJul 26, 18:20 UTC1h 20m
2026-07-26 ASA1339 CUN → LAX Jul 26, 15:05 UTCJul 26, 15:50 UTC45m
2026-07-26 ASA1612 ANC → FAI Jul 26, 04:45 UTCJul 26, 05:30 UTC45m
2026-07-26 ASA1544 ANC → OME Jul 26, 00:05 UTCJul 26, 03:30 UTC3h 25m
2026-07-25 ASA1415 LIR → LAX Jul 25, 21:40 UTCJul 25, 22:25 UTC45m
2026-07-25 ASA1552 SEA → FAI Jul 25, 17:15 UTCJul 25, 20:25 UTC3h 10m
2026-07-25 ASA1552 SEA → FAI Jul 25, 17:15 UTCJul 25, 20:28 UTC3h 13m
2026-07-25 ASA364 BOS → SEA Jul 25, 14:42 UTCJul 25, 15:08 UTC26m
2026-07-25 ASA364 BOS → SEA Jul 25, 14:35 UTCJul 25, 15:20 UTC45m
2026-07-25 ASA350 LAX → IAD Jul 25, 06:15 UTCJul 25, 06:50 UTC35m
2026-07-25 ASA350 LAX → IAD Jul 25, 06:22 UTCJul 25, 06:43 UTC21m
2026-07-25 ASA66 JNU → SEA Jul 25, 02:40 UTCJul 25, 04:35 UTC1h 55m
2026-07-25 ASA66 JNU → SEA Jul 25, 02:49 UTCJul 25, 04:18 UTC1h 29m
2026-07-25 ASA66 JNU → SEA Jul 25, 00:50 UTCJul 25, 01:15 UTC25m
2026-07-24 ASA66 JNU → SEA Jul 24, 23:00 UTCJul 24, 23:35 UTC35m
2026-07-24 ASA66 JNU → SEA Jul 24, 21:25 UTCJul 24, 22:00 UTC35m
2026-07-24 ASA357 BOS → SFO Jul 24, 16:45 UTCJul 24, 20:05 UTC3h 20m
2026-07-24 ASA1554 JNU → SEA Jul 24, 13:10 UTCJul 24, 15:10 UTC2h 0m
2026-07-24 ASA71 SEA → JNU Jul 24, 04:59 UTCJul 24, 06:50 UTC1h 51m
2026-07-24 ASA71 SEA → JNU Jul 24, 04:45 UTCJul 24, 07:00 UTC2h 15m
2026-07-24 ASA774 SNA → SEA Jul 24, 01:00 UTCJul 24, 03:05 UTC2h 5m
2026-07-23 ASA773 EWR → SAN Jul 23, 21:35 UTCJul 24, 00:10 UTC2h 35m
2026-07-23 ASA773 EWR → SAN Jul 23, 21:30 UTCJul 23, 23:54 UTC2h 24m
2026-07-23 ASA765 ANC → SEA Jul 23, 16:45 UTCJul 23, 19:45 UTC3h 0m
2026-07-23 ASA87 SEA → SJC Jul 23, 02:28 UTCJul 23, 03:59 UTC1h 31m
2026-07-23 ASA86 SEA → JFK Jul 23, 00:20 UTCJul 23, 01:10 UTC50m
2026-07-22 ASA065 SEA → KTN Jul 22, 21:35 UTCJul 22, 23:00 UTC1h 25m
2026-07-22 ASA65 SEA → KTN Jul 22, 19:45 UTCJul 22, 20:10 UTC25m
2026-07-22 ASA65 SEA → KTN Jul 22, 17:05 UTCJul 22, 17:20 UTC15m
2026-07-22 ASA65 SEA → KTN Jul 22, 14:25 UTCJul 22, 15:40 UTC1h 15m
2026-07-22 ASA65 SEA → KTN Jul 22, 14:20 UTCJul 22, 15:51 UTC1h 31m
2026-07-22 ASA54 - Jul 22, 10:20 UTCJul 22, 13:00 UTC2h 40m
2026-07-22 ASA54 ANC → SEA Jul 22, 09:46 UTCJul 22, 12:56 UTC3h 10m
2026-07-21 ASA1544 ANC → OME Jul 21, 23:35 UTCJul 22, 03:35 UTC4h 0m
2026-07-21 ASA55 ANC → SCC Jul 21, 15:30 UTCJul 21, 19:10 UTC3h 40m
2026-07-21 1613 - Jul 21, 03:10 UTCJul 21, 04:25 UTC1h 15m
2026-07-21 ASA1537 SEA → MSO Jul 21, 00:40 UTCJul 21, 01:55 UTC1h 15m
2026-07-20 65 - Jul 20, 21:05 UTCJul 20, 22:50 UTC1h 45m
2026-07-20 ASA65 - Jul 20, 19:35 UTCJul 20, 20:00 UTC25m
2026-07-20 ASA65 - Jul 20, 17:05 UTCJul 20, 17:20 UTC15m
2026-07-20 ASA65 - Jul 20, 14:10 UTCJul 20, 15:40 UTC1h 30m
2026-07-20 ASA221 JFK → SEA Jul 20, 08:40 UTCJul 20, 11:50 UTC3h 10m
2026-07-19 ASA1544 ANC → OME Jul 19, 23:45 UTCJul 20, 03:20 UTC3h 35m
2026-07-19 ASA61 - Jul 19, 21:05 UTCJul 19, 21:40 UTC35m
2026-07-19 ASA61 YAK → CDV Jul 19, 19:15 UTCJul 19, 19:55 UTC40m
2026-07-19 61 - Jul 19, 17:35 UTCJul 19, 18:05 UTC30m
2026-07-19 ASA61 - Jul 19, 14:25 UTCJul 19, 16:25 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 N613AS page for operator, model, and routing details .

Mode-S A7F9F4 frequently asked

What is Mode-S code A7F9F4?
A7F9F4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N613AS.
Where is Mode-S A7F9F4 registered?
Mode-S code A7F9F4 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 A7F9F4 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 23:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A7F9F4, octal 51774764, decimal 11,008,500.
What flights does A7F9F4 operate?
Mode-S A7F9F4 has broadcast 20 distinct callsigns, including ASA61, ASA65, ASA62, ASA66, ASA64.