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 1d ago
Flights observed
554
Distinct callsigns
20
Country
US
Last broadcast
1d ago

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 - 56 2026-07-08
ASA65 - 33 2026-07-07
ASA62 Alaska Airlines 31 2026-06-07
ASA66 Alaska Airlines 25 2026-07-04
ASA64 Alaska Airlines 23 2026-05-26
ASA70 - 19 2026-07-12
ASA73 - 18 2026-07-12
ASA67 Alaska Airlines 13 2026-06-07
ASA69 - 12 2026-07-05
ASA60 - 10 2026-07-05
ASA310 Alaska Airlines 10 2026-06-05
ASA87 - 9 2026-07-09
ASA55 - 8 2026-07-04
ASA374 Alaska Airlines 8 2026-06-03
ASA229 Alaska Airlines 8 2026-06-08
ASA1528 - 8 2026-07-11
ASA86 - 7 2026-07-09
ASA445 - 7 2026-07-06
ASA289 Alaska Airlines 7 2026-06-03
ASA249 Alaska Airlines 7 2026-06-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 ASA1544 - Jul 13, 02:15 UTCJul 13, 03:20 UTC1h 5m
2026-07-12 ASA1544 - Jul 12, 23:50 UTCJul 13, 00:45 UTC55m
2026-07-12 ASA44 - Jul 12, 21:25 UTCJul 12, 22:20 UTC55m
2026-07-12 ASA43 - Jul 12, 19:05 UTCJul 12, 19:50 UTC45m
2026-07-12 ASA73 - Jul 12, 15:40 UTCJul 12, 16:55 UTC1h 15m
2026-07-12 ASA73 - Jul 12, 14:15 UTCJul 12, 14:30 UTC15m
2026-07-12 ASA70 - Jul 12, 06:40 UTCJul 12, 06:55 UTC15m
2026-07-12 ASA70 - Jul 12, 03:55 UTCJul 12, 05:10 UTC1h 15m
2026-07-11 ASA52 - Jul 11, 22:20 UTCJul 12, 02:35 UTC4h 15m
2026-07-11 ASA1528 OTZ → ANC Jul 11, 19:30 UTCJul 11, 20:50 UTC1h 20m
2026-07-11 ASA1527 ANC → OTZ Jul 11, 17:10 UTCJul 11, 18:25 UTC1h 15m
2026-07-11 ASA1527 ANC → OTZ Jul 11, 17:09 UTCJul 11, 18:24 UTC1h 15m
2026-07-11 ASA1363 SEA → ANC Jul 11, 07:20 UTCJul 11, 10:25 UTC3h 5m
2026-07-11 ASA268 ANC → SEA Jul 11, 00:30 UTCJul 11, 03:45 UTC3h 15m
2026-07-10 ASA43 - Jul 10, 21:20 UTCJul 10, 22:10 UTC50m
2026-07-10 ASA43 - Jul 10, 19:05 UTCJul 10, 19:50 UTC45m
2026-07-10 ASA73 - Jul 10, 15:50 UTCJul 10, 17:15 UTC1h 25m
2026-07-10 ASA73 - Jul 10, 14:05 UTCJul 10, 14:25 UTC20m
2026-07-10 ASA70 - Jul 10, 06:10 UTCJul 10, 06:20 UTC10m
2026-07-10 ASA70 - Jul 10, 03:40 UTCJul 10, 04:55 UTC1h 15m
2026-07-09 ASA52 ANC → ANC Jul 9, 22:20 UTCJul 10, 02:35 UTC4h 15m
2026-07-09 ASA1528 SEA → BUR Jul 9, 19:46 UTCJul 9, 20:49 UTC1h 3m
2026-07-09 ASA1528 SEA → BUR Jul 9, 19:35 UTCJul 9, 20:55 UTC1h 20m
2026-07-09 ASA1527 ANC → OTZ Jul 9, 17:10 UTCJul 9, 18:30 UTC1h 20m
2026-07-09 ASA1527 ANC → OTZ Jul 9, 17:10 UTCJul 9, 18:27 UTC1h 17m
2026-07-09 ASA87 - Jul 9, 02:45 UTCJul 9, 03:45 UTC1h 0m
2026-07-09 ASA87 SCC → ANC Jul 9, 02:34 UTCJul 9, 03:39 UTC1h 5m
2026-07-09 ASA86 ANC → SCC Jul 9, 00:07 UTCJul 9, 01:32 UTC1h 25m
2026-07-09 ASA86 - Jul 9, 00:10 UTCJul 9, 03:00 UTC2h 50m
2026-07-08 ASA61 CDV → ANC Jul 8, 22:10 UTCJul 8, 22:55 UTC45m
2026-07-08 ASA61 CDV → ANC Jul 8, 22:08 UTCJul 8, 22:43 UTC35m
2026-07-08 ASA61 - Jul 8, 20:40 UTCJul 8, 21:15 UTC35m
2026-07-08 61 - Jul 8, 18:35 UTCJul 8, 18:55 UTC20m
2026-07-08 ASA61 - Jul 8, 15:30 UTCJul 8, 17:40 UTC2h 10m
2026-07-08 ASA54 - Jul 8, 09:30 UTCJul 8, 12:25 UTC2h 55m
2026-07-08 ASA1613 - Jul 8, 03:05 UTCJul 8, 04:30 UTC1h 25m
2026-07-08 ASA1537 - Jul 8, 00:35 UTCJul 8, 01:45 UTC1h 10m
2026-07-07 ASA65 - Jul 7, 21:15 UTCJul 7, 22:35 UTC1h 20m
2026-07-07 ASA65 JNU → ANC Jul 7, 21:20 UTCJul 7, 22:25 UTC1h 5m
2026-07-07 ASA65 - Jul 7, 19:30 UTCJul 7, 19:50 UTC20m
2026-07-07 ASA65 - Jul 7, 17:00 UTCJul 7, 17:10 UTC10m
2026-07-07 ASA65 - Jul 7, 14:10 UTCJul 7, 15:20 UTC1h 10m
2026-07-07 ASA1498 ANC → SEA Jul 7, 09:00 UTCJul 7, 12:05 UTC3h 5m
2026-07-07 ASA1613 - Jul 7, 03:20 UTCJul 7, 04:45 UTC1h 25m
2026-07-07 ASA1537 - Jul 7, 00:35 UTCJul 7, 01:55 UTC1h 20m
2026-07-06 ASA1415 FAI → ANC Jul 6, 21:35 UTCJul 6, 22:20 UTC45m
2026-07-06 ASA1552 SEA → FAI Jul 6, 17:05 UTCJul 6, 20:15 UTC3h 10m
2026-07-06 ASA445 - Jul 6, 04:50 UTCJul 6, 06:55 UTC2h 5m
2026-07-06 ASA764 - Jul 6, 00:30 UTCJul 6, 00:40 UTC10m
2026-07-05 ASA435 SEA → FNR Jul 5, 21:05 UTCJul 5, 23:10 UTC2h 5m

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 1d ago.
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.