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sensors Mode-S transponder

AD237C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N946AK · BOEING 737 MAX 9 · operated by ALASKA AIRLINES INC

Hex
AD237C
Octal
53221574
Decimal
11,346,812
Country
US
Tail
N946AK
Type
B39M
No current signal · last broadcast Jul 26, 23:00 UTC
Flights observed
441
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 23:00 UTC

Last known position

Most recent position reported by Mode-S AD237C.

Country allocation

The ICAO 24-bit address AD237C 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
ASA216 Alaska Airlines 6 2026-07-23
ASA1477 Alaska Airlines 5 2026-07-26
ASA95 Alaska Airlines 4 2026-06-09
ASA762 Alaska Airlines 4 2026-06-10
ASA541 Alaska Airlines 4 2026-07-01
ASA517 - 4 2026-07-08
ASA419 Alaska Airlines 4 2026-06-20
ASA416 - 4 2026-06-29
ASA328 Alaska Airlines 4 2026-07-25
ASA300 Alaska Airlines 4 2026-06-20
ASA299 Alaska Airlines 4 2026-04-14
ASA266 Alaska Airlines 4 2026-06-04
ASA84 Alaska Airlines 3 2026-04-18
ASA787 Alaska Airlines 3 2026-05-30
ASA758 Alaska Airlines 3 2026-06-09
ASA745 Alaska Airlines 3 2026-05-16
ASA684 Alaska Airlines 3 2026-06-08
ASA657 Alaska Airlines 3 2026-05-16
ASA623 - 3 2026-06-29
ASA555 Alaska Airlines 3 2026-04-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA92 ANC → SEA Jul 26, 21:50 UTCJul 26, 23:00 UTC1h 10m
2026-07-26 ASA1477 SFO → SEA Jul 26, 17:55 UTCJul 26, 20:05 UTC2h 10m
2026-07-26 ASA1361 SFO → PVR Jul 26, 13:25 UTCJul 26, 15:55 UTC2h 30m
2026-07-26 ASA550 EWR → SFO Jul 26, 02:15 UTCJul 26, 05:45 UTC3h 30m
2026-07-26 ASA550 EWR → SFO Jul 26, 02:00 UTCJul 26, 02:05 UTC5m
2026-07-25 ASA380 SEA → MSP Jul 25, 22:00 UTCJul 26, 00:40 UTC2h 40m
2026-07-25 ASA1394 SJD → SJC Jul 25, 18:30 UTCJul 25, 20:50 UTC2h 20m
2026-07-25 ASA413 SFO → LAS Jul 25, 12:40 UTCJul 25, 16:40 UTC4h 0m
2026-07-25 ASA328 SEA → ORD Jul 25, 07:35 UTCJul 25, 10:55 UTC3h 20m
2026-07-25 ASA1681 LAS → SEA Jul 25, 02:25 UTCJul 25, 04:30 UTC2h 5m
2026-07-24 ASA600 PDX → SFO Jul 24, 22:30 UTCJul 25, 00:35 UTC2h 5m
2026-07-24 ASA785 LAS → SEA Jul 24, 18:55 UTCJul 24, 21:00 UTC2h 5m
2026-07-24 ASA612 SEA → LAS Jul 24, 15:05 UTCJul 24, 17:10 UTC2h 5m
2026-07-23 ASA216 SEA → CLE Jul 23, 22:25 UTCJul 24, 03:05 UTC4h 40m
2026-07-23 ASA216 SEA → CLE Jul 23, 16:40 UTCJul 23, 20:20 UTC3h 40m
2026-07-23 ASA440 MIA → PDX Jul 23, 11:15 UTCJul 23, 15:05 UTC3h 50m
2026-07-23 ASA307 LAX → SFO Jul 23, 01:25 UTCJul 23, 04:30 UTC3h 5m
2026-07-22 ASA734 PHX → PAE Jul 22, 22:10 UTCJul 22, 23:45 UTC1h 35m
2026-07-22 ASA734 PHX → PAE Jul 22, 22:09 UTCJul 22, 23:54 UTC1h 45m
2026-07-22 ASA733 LAS → SEA Jul 22, 19:15 UTCJul 22, 20:55 UTC1h 40m
2026-07-22 ASA451 IAD → SFO Jul 22, 13:27 UTCJul 22, 17:14 UTC3h 47m
2026-07-22 ASA451 IAD → SFO Jul 22, 13:15 UTCJul 22, 17:25 UTC4h 10m
2026-07-22 ASA490 SEA → MSY Jul 22, 10:20 UTCJul 22, 11:40 UTC1h 20m
2026-07-22 ASA501 PHX → SFO Jul 22, 02:25 UTCJul 22, 05:25 UTC3h 0m
2026-07-21 ASA497 ATL → SEA Jul 21, 22:10 UTCJul 22, 01:00 UTC2h 50m
2026-07-21 ASA796 SJC → LAX Jul 21, 17:55 UTCJul 21, 19:25 UTC1h 30m
2026-07-21 ASA292 SFO → EWR Jul 21, 14:35 UTCJul 21, 16:10 UTC1h 35m
2026-07-20 ASA356 - Jul 20, 21:05 UTCJul 21, 02:35 UTC5h 29m
2026-07-20 ASA239 LIH → SJC Jul 20, 15:20 UTCJul 20, 19:30 UTC4h 10m
2026-07-20 ASA614 SEA → SLC Jul 20, 03:30 UTCJul 20, 05:30 UTC2h 0m
2026-07-19 ASA1300 SEA → LAX Jul 19, 23:20 UTCJul 20, 01:45 UTC2h 25m
2026-07-19 ASA596 - Jul 19, 20:20 UTCJul 19, 21:50 UTC1h 30m
2026-07-19 ASA653 - Jul 19, 17:35 UTCJul 19, 18:55 UTC1h 20m
2026-07-19 ASA607 TPA → SFO Jul 19, 13:25 UTCJul 19, 15:25 UTC2h 0m
2026-07-19 ASA489 SEA → ONT Jul 19, 04:25 UTCJul 19, 06:35 UTC2h 10m
2026-07-19 ASA489 SEA → ONT Jul 19, 04:22 UTCJul 19, 06:36 UTC2h 14m
2026-07-18 ASA9450 GSO → SEA Jul 18, 22:10 UTCJul 19, 01:45 UTC3h 35m
2026-07-17 ASA9441 GSO → SEA Jul 17, 22:35 UTCJul 18, 01:15 UTC2h 40m
2026-07-10 ASA9420 - Jul 10, 16:35 UTCJul 10, 20:15 UTC3h 40m
2026-07-10 ASA1498 ANC → SEA Jul 10, 09:05 UTCJul 10, 12:10 UTC3h 5m
2026-07-10 ASA667 SEA → ANC Jul 10, 03:45 UTCJul 10, 06:45 UTC3h 0m
2026-07-10 ASA667 SEA → ANC Jul 10, 03:42 UTCJul 10, 06:40 UTC2h 58m
2026-07-09 ASA508 - Jul 9, 21:15 UTCJul 10, 01:40 UTC4h 25m
2026-07-09 ASA508 SEA → CVG Jul 9, 16:05 UTCJul 9, 19:50 UTC3h 45m
2026-07-08 ASA517 PPM → SEA Jul 8, 23:10 UTCJul 9, 05:00 UTC5h 50m
2026-07-08 ASA516 SEA → FLL Jul 8, 16:35 UTCJul 8, 21:45 UTC5h 10m
2026-07-08 ASA563 - Jul 8, 11:20 UTCJul 8, 14:45 UTC3h 25m
2026-07-08 ASA564 SEA → MCI Jul 8, 01:55 UTCJul 8, 04:43 UTC2h 48m
2026-07-08 ASA564 - Jul 8, 01:50 UTCJul 8, 04:50 UTC3h 0m
2026-07-07 ASA315 ANC → SEA Jul 7, 17:20 UTCJul 7, 20:30 UTC3h 10m

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 N946AK page for operator, model, and routing details .

Mode-S AD237C frequently asked

What is Mode-S code AD237C?
AD237C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N946AK.
Where is Mode-S AD237C registered?
Mode-S code AD237C 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 AD237C 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 AD237C, octal 53221574, decimal 11,346,812.
What flights does AD237C operate?
Mode-S AD237C has broadcast 20 distinct callsigns, including ASA216, ASA1477, ASA95, ASA762, ASA541.