Apparatus

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sensors Mode-S transponder

ACF48F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N934AK · operated by BANK OF UTAH TRUSTEE

Hex
ACF48F
Octal
53172217
Decimal
11,334,799
Country
US
Tail
N934AK
Type
B39M
Broadcasting now · callsign ASA474 · 36,000 ft
Flights observed
386
Distinct callsigns
20
Country
US
Last broadcast
35m ago

Current position

ACF48F is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address ACF48F 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
ASA787 Alaska Airlines 9 2026-05-28
ASA259 - 7 2026-07-03
ASA418 Alaska Airlines 6 2026-05-06
ASA238 - 6 2026-07-02
ASA508 Alaska Airlines 5 2026-04-15
ASA670 - 4 2026-04-14
ASA502 Alaska Airlines 4 2026-06-15
ASA48 - 4 2026-04-13
ASA382 Alaska Airlines 4 2026-05-26
ASA349 - 4 2026-07-05
ASA1381 Alaska Airlines 4 2026-05-08
ASA696 Alaska Airlines 3 2026-04-18
ASA693 - 3 2026-07-09
ASA677 Alaska Airlines 3 2026-04-14
ASA42 - 3 2026-06-23
ASA293 Alaska Airlines 3 2026-05-16
ASA281 Alaska Airlines 3 2026-04-17
ASA270 Alaska Airlines 3 2026-05-10
ASA267 - 3 2026-06-30
ASA266 - 3 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 ASA474 - Jul 14, 02:05 UTCJul 14, 03:45 UTC1h 40m
2026-07-13 ASA434 - Jul 13, 19:35 UTCJul 14, 00:15 UTC4h 40m
2026-07-13 ASA1680 SMF → SAN Jul 13, 15:00 UTCJul 13, 16:15 UTC1h 15m
2026-07-13 ASA1680 SMF → SAN Jul 13, 14:45 UTCJul 13, 16:11 UTC1h 26m
2026-07-13 ASA1621 SAN → SMF Jul 13, 05:34 UTCJul 13, 06:46 UTC1h 12m
2026-07-13 ASA1621 - Jul 13, 05:45 UTCJul 13, 06:50 UTC1h 5m
2026-07-13 ASA369 PDX → SAN Jul 13, 01:50 UTCJul 13, 04:05 UTC2h 15m
2026-07-12 ASA1383 BUR → PDX Jul 12, 21:40 UTCJul 12, 23:20 UTC1h 40m
2026-07-12 ASA1384 PDX → BUR Jul 12, 18:10 UTCJul 12, 20:10 UTC2h 0m
2026-07-12 ASA1384 PDX → BUR Jul 12, 18:08 UTCJul 12, 20:08 UTC2h 0m
2026-07-12 ASA679 SJC → PDX Jul 12, 15:05 UTCJul 12, 16:20 UTC1h 15m
2026-07-12 ASA1310 SEA → SJC Jul 12, 03:45 UTCJul 12, 05:35 UTC1h 50m
2026-07-11 ASA535 DEN → SEA Jul 11, 22:55 UTCJul 12, 01:20 UTC2h 25m
2026-07-11 ASA535 SEA → DEN Jul 11, 19:05 UTCJul 11, 21:10 UTC2h 5m
2026-07-11 ASA651 PHX → SEA Jul 11, 15:30 UTCJul 11, 17:30 UTC2h 0m
2026-07-11 ASA91 - Jul 11, 04:40 UTCJul 11, 06:20 UTC1h 40m
2026-07-11 ASA683 SMF → SEA Jul 11, 00:25 UTCJul 11, 01:50 UTC1h 25m
2026-07-10 ASA681 SEA → SMF Jul 10, 21:45 UTCJul 10, 23:10 UTC1h 25m
2026-07-10 ASA643 DEN → SEA Jul 10, 17:30 UTCJul 10, 19:50 UTC2h 20m
2026-07-10 ASA1619 SAN → DEN Jul 10, 03:10 UTCJul 10, 05:00 UTC1h 50m
2026-07-10 ASA1619 SAN → DEN Jul 10, 03:09 UTCJul 10, 04:49 UTC1h 40m
2026-07-10 ASA266 - Jul 10, 01:20 UTCJul 10, 02:05 UTC45m
2026-07-09 ASA266 KOA → SAN Jul 9, 21:10 UTCJul 10, 01:59 UTC4h 49m
2026-07-09 ASA266 - Jul 9, 21:05 UTCJul 9, 21:15 UTC10m
2026-07-09 ASA693 - Jul 9, 19:15 UTCJul 9, 19:25 UTC10m
2026-07-09 ASA693 - Jul 9, 14:35 UTCJul 9, 15:00 UTC25m
2026-07-09 ASA693 SFO → KOA Jul 9, 14:30 UTCJul 9, 19:24 UTC4h 54m
2026-07-09 ASA1601 LAX → SFO Jul 9, 03:45 UTCJul 9, 04:40 UTC55m
2026-07-08 ASA56 - Jul 8, 19:30 UTCJul 9, 00:10 UTC4h 40m
2026-07-08 ASA1615 PDX → ANC Jul 8, 14:35 UTCJul 8, 18:10 UTC3h 35m
2026-07-08 ASA650 PHX → PDX Jul 8, 04:15 UTCJul 8, 06:30 UTC2h 15m
2026-07-08 ASA744 SEA → PHX Jul 8, 00:20 UTCJul 8, 02:50 UTC2h 30m
2026-07-08 ASA744 SEA → PHX Jul 8, 00:19 UTCJul 8, 02:48 UTC2h 29m
2026-07-07 ASA762 - Jul 7, 21:55 UTCJul 7, 22:45 UTC50m
2026-07-07 ASA762 - Jul 7, 17:15 UTCJul 7, 17:25 UTC10m
2026-07-07 ASA761 - Jul 7, 07:10 UTCJul 7, 07:25 UTC15m
2026-07-07 ASA761 - Jul 7, 02:10 UTCJul 7, 03:00 UTC50m
2026-07-06 ASA618 STL → SEA Jul 6, 20:00 UTCJul 7, 00:10 UTC4h 10m
2026-07-06 ASA618 SEA → STL Jul 6, 15:10 UTCJul 6, 18:30 UTC3h 20m
2026-07-06 ASA206 PDX → SFO Jul 6, 12:25 UTCJul 6, 13:15 UTC50m
2026-07-06 ASA353 - Jul 6, 01:00 UTCJul 6, 01:40 UTC40m
2026-07-06 ASA353 PDX → OGG Jul 6, 00:57 UTCJul 6, 05:56 UTC4h 59m
2026-07-05 ASA1633 SJC → PDX Jul 5, 22:05 UTCJul 5, 23:30 UTC1h 25m
2026-07-05 ASA1632 PDX → SJC Jul 5, 19:30 UTCJul 5, 21:00 UTC1h 30m
2026-07-05 ASA349 LAS → PDX Jul 5, 15:45 UTCJul 5, 17:30 UTC1h 45m
2026-07-05 ASA1636 - Jul 5, 08:20 UTCJul 5, 13:00 UTC4h 40m
2026-07-04 ASA1560 SEA → ANC Jul 4, 05:20 UTCJul 4, 08:25 UTC3h 5m
2026-07-03 ASA391 YYZ → SEA Jul 3, 21:40 UTCJul 4, 02:30 UTC4h 50m
2026-07-03 ASA385 SEA → YYZ Jul 3, 15:40 UTCJul 3, 19:45 UTC4h 5m
2026-07-03 ASA259 - Jul 3, 07:25 UTCJul 3, 07:45 UTC20m

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 N934AK page for operator, model, and routing details .

Mode-S ACF48F frequently asked

What is Mode-S code ACF48F?
ACF48F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N934AK.
Where is Mode-S ACF48F registered?
Mode-S code ACF48F 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 ACF48F broadcasting right now?
Yes. Mode-S ACF48F is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ACF48F, octal 53172217, decimal 11,334,799.
What flights does ACF48F operate?
Mode-S ACF48F has broadcast 20 distinct callsigns, including ASA787, ASA259, ASA418, ASA238, ASA508.