Apparatus

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sensors Mode-S transponder

ACFBFD

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N936AK · BOEING 737 MAX 9 · operated by BANK OF UTAH TRUSTEE

Hex
ACFBFD
Octal
53175775
Decimal
11,336,701
Country
US
Tail
N936AK
Type
B39M
No current signal · last broadcast Jul 26, 19:30 UTC
Flights observed
369
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 19:30 UTC

Last known position

Most recent position reported by Mode-S ACFBFD.

Country allocation

The ICAO 24-bit address ACFBFD 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
ASA312 Alaska Airlines 9 2026-04-17
ASA507 - 7 2026-07-15
ASA202 - 7 2026-07-16
ASA244 Alaska Airlines 6 2026-07-24
ASA514 Alaska Airlines 5 2026-04-18
ASA494 Alaska Airlines 5 2026-04-17
ASA394 Alaska Airlines 5 2026-07-23
ASA380 Alaska Airlines 5 2026-04-18
ASA254 Alaska Airlines 5 2026-07-23
ASA775 Alaska Airlines 4 2026-04-27
ASA572 Alaska Airlines 4 2026-07-24
ASA570 Alaska Airlines 4 2026-06-12
ASA426 Alaska Airlines 4 2026-05-12
ASA75 - 3 2026-07-08
ASA708 Alaska Airlines 3 2026-07-23
ASA629 Alaska Airlines 3 2026-04-18
ASA557 - 3 2026-07-12
ASA556 - 3 2026-07-12
ASA530 Alaska Airlines 3 2026-05-26
ASA517 - 3 2026-07-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA437 CMH → SEA Jul 26, 18:05 UTCJul 26, 19:30 UTC1h 25m
2026-07-26 ASA581 SEA → PSP Jul 26, 14:20 UTCJul 26, 16:25 UTC2h 5m
2026-07-26 ASA558 SEA → SAN Jul 26, 11:15 UTCJul 26, 12:05 UTC50m
2026-07-25 ASA223 SEA → FAI Jul 25, 21:40 UTCJul 25, 22:35 UTC55m
2026-07-25 ASA338 SEA → SJC Jul 25, 13:55 UTCJul 25, 19:40 UTC5h 45m
2026-07-25 ASA536 SEA → BOS Jul 25, 07:25 UTCJul 25, 12:00 UTC4h 35m
2026-07-24 ASA572 RDU → SEA Jul 24, 22:05 UTCJul 25, 03:20 UTC5h 15m
2026-07-24 ASA572 RDU → SEA Jul 24, 22:02 UTCJul 25, 03:16 UTC5h 14m
2026-07-24 ASA572 RDU → SEA Jul 24, 16:15 UTCJul 24, 20:40 UTC4h 25m
2026-07-24 ASA244 OGG → SEA Jul 24, 05:35 UTCJul 24, 06:25 UTC50m
2026-07-23 ASA254 ANC → SEA Jul 23, 23:55 UTCJul 24, 00:05 UTC10m
2026-07-23 ASA254 ANC → SEA Jul 23, 18:40 UTCJul 23, 19:15 UTC35m
2026-07-23 ASA708 HNL → SFO Jul 23, 11:45 UTCJul 23, 16:00 UTC4h 15m
2026-07-23 ASA394 SJC → PDX Jul 23, 05:25 UTCJul 23, 10:20 UTC4h 55m
2026-07-23 ASA249 SEA → OAK Jul 23, 01:10 UTCJul 23, 03:25 UTC2h 15m
2026-07-22 ASA242 MKE → SEA Jul 22, 23:20 UTCJul 22, 23:25 UTC5m
2026-07-22 ASA242 MKE → SEA Jul 22, 21:05 UTCJul 22, 23:25 UTC2h 20m
2026-07-22 ASA242 MKE → SEA Jul 22, 21:01 UTCJul 22, 23:03 UTC2h 2m
2026-07-22 ASA338 BOS → SEA Jul 22, 13:35 UTCJul 22, 18:55 UTC5h 20m
2026-07-22 ASA338 BOS → SEA Jul 22, 13:35 UTCJul 22, 19:05 UTC5h 30m
2026-07-21 ASA205 SAN → SEA Jul 21, 23:25 UTCJul 22, 04:35 UTC5h 10m
2026-07-21 ASA222 SAN → AUS Jul 21, 22:05 UTCJul 21, 22:10 UTC5m
2026-07-21 ASA222 SAN → AUS Jul 21, 16:42 UTCJul 21, 22:00 UTC5h 18m
2026-07-21 ASA222 SAN → AUS Jul 21, 16:40 UTCJul 21, 17:10 UTC30m
2026-07-20 ASA35 JFK → SAN Jul 20, 16:00 UTCJul 20, 20:55 UTC4h 55m
2026-07-19 ASA16 SEA → JFK Jul 19, 21:45 UTCJul 20, 02:05 UTC4h 20m
2026-07-19 ASA796 SJC → LAX Jul 19, 18:00 UTCJul 19, 19:40 UTC1h 40m
2026-07-19 ASA292 SFO → EWR Jul 19, 15:00 UTCJul 19, 16:30 UTC1h 30m
2026-07-19 ASA403 SMF → SEA Jul 19, 04:55 UTCJul 19, 06:15 UTC1h 20m
2026-07-19 ASA1622 PDX → SMF Jul 19, 02:25 UTCJul 19, 03:15 UTC50m
2026-07-19 ASA1622 PDX → SMF Jul 19, 02:35 UTCJul 19, 03:38 UTC1h 3m
2026-07-18 ASA1422 PDX → SJD Jul 18, 16:00 UTCJul 19, 00:05 UTC8h 5m
2026-07-17 ASA1319 SFO → PDX Jul 17, 21:44 UTCJul 18, 03:25 UTC5h 41m
2026-07-17 ASA390 - Jul 17, 14:35 UTCJul 17, 19:45 UTC5h 10m
2026-07-17 ASA1348 SEA → SAN Jul 17, 00:40 UTCJul 17, 03:10 UTC2h 30m
2026-07-16 ASA246 - Jul 16, 21:30 UTCJul 16, 22:30 UTC1h 0m
2026-07-16 ASA202 - Jul 16, 07:35 UTCJul 16, 07:50 UTC15m
2026-07-16 ASA202 - Jul 16, 02:20 UTCJul 16, 03:10 UTC50m
2026-07-15 ASA507 - Jul 15, 20:15 UTCJul 16, 00:05 UTC3h 50m
2026-07-15 ASA507 SEA → MKE Jul 15, 15:40 UTCJul 15, 19:05 UTC3h 25m
2026-07-15 ASA339 AUS → SEA Jul 15, 01:05 UTCJul 15, 04:45 UTC3h 40m
2026-07-14 ASA604 SEA → AUS Jul 14, 19:50 UTCJul 14, 23:35 UTC3h 44m
2026-07-14 ASA665 SLC → SEA Jul 14, 02:05 UTCJul 14, 03:45 UTC1h 40m
2026-07-14 ASA665 SLC → SEA Jul 14, 02:05 UTCJul 14, 03:38 UTC1h 33m
2026-07-13 ASA368 SEA → SLC Jul 13, 22:55 UTCJul 14, 00:35 UTC1h 40m
2026-07-13 ASA475 - Jul 13, 19:20 UTCJul 13, 21:25 UTC2h 5m
2026-07-13 ASA1471 SEA → SAN Jul 13, 14:45 UTCJul 13, 18:00 UTC3h 15m
2026-07-12 ASA216 - Jul 12, 22:10 UTCJul 13, 02:30 UTC4h 20m
2026-07-12 ASA216 SEA → CLE Jul 12, 16:40 UTCJul 12, 20:30 UTC3h 50m
2026-07-12 ASA557 - Jul 12, 11:10 UTCJul 12, 14:15 UTC3h 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 N936AK page for operator, model, and routing details .

Mode-S ACFBFD frequently asked

What is Mode-S code ACFBFD?
ACFBFD is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N936AK.
Where is Mode-S ACFBFD registered?
Mode-S code ACFBFD 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 ACFBFD broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 19:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ACFBFD, octal 53175775, decimal 11,336,701.
What flights does ACFBFD operate?
Mode-S ACFBFD has broadcast 20 distinct callsigns, including ASA312, ASA507, ASA202, ASA244, ASA514.