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sensors Mode-S transponder

AD3FD6

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N953AK · BOEING 737 MAX 9 · operated by ALASKA AIRLINES INC

Hex
AD3FD6
Octal
53237726
Decimal
11,354,070
Country
US
Tail
N953AK
Type
B39M
Broadcasting now · callsign ASA661 · 14,300 ft
Flights observed
465
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:05 UTC

Current position

AD3FD6 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AD3FD6 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
ASA463 - 9 2026-06-22
ASA531 Alaska Airlines 6 2026-07-21
ASA24 Alaska Airlines 6 2026-06-25
ASA762 Alaska Airlines 5 2026-07-25
ASA638 Alaska Airlines 5 2026-04-18
ASA437 - 5 2026-07-08
ASA305 Alaska Airlines 5 2026-04-13
ASA224 Alaska Airlines 5 2026-05-05
ASA205 Alaska Airlines 5 2026-07-24
ASA98 Alaska Airlines 4 2026-05-12
ASA761 Alaska Airlines 4 2026-07-25
ASA709 Alaska Airlines 4 2026-05-22
ASA705 Alaska Airlines 4 2026-05-07
ASA67 Alaska Airlines 4 2026-07-20
ASA581 - 4 2026-07-08
ASA529 - 4 2026-06-26
ASA458 Alaska Airlines 4 2026-05-30
ASA453 Alaska Airlines 4 2026-05-29
ASA398 Alaska Airlines 4 2026-05-29
ASA321 Alaska Airlines 4 2026-06-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA586 SEA → DFW Jul 26, 19:20 UTCJul 26, 20:05 UTC45m
2026-07-26 ASA1541 MSP → ANC Jul 26, 13:13 UTCJul 26, 18:09 UTC4h 56m
2026-07-26 ASA1541 MSP → ANC Jul 26, 12:55 UTCJul 26, 18:15 UTC5h 20m
2026-07-26 ASA1540 SEA → ANC Jul 26, 06:00 UTCJul 26, 10:50 UTC4h 51m
2026-07-26 ASA225 BUR → PDX Jul 26, 00:45 UTCJul 26, 03:45 UTC3h 0m
2026-07-25 ASA762 PDX → PHX Jul 25, 21:45 UTCJul 25, 22:40 UTC55m
2026-07-25 ASA762 PDX → PHX Jul 25, 17:35 UTCJul 25, 17:50 UTC15m
2026-07-25 ASA761 SEA → SJC Jul 25, 09:55 UTCJul 25, 10:10 UTC15m
2026-07-25 ASA761 SEA → SJC Jul 25, 04:45 UTCJul 25, 05:20 UTC35m
2026-07-24 ASA1506 OGG → LAX Jul 24, 19:50 UTCJul 25, 01:40 UTC5h 50m
2026-07-24 ASA1506 OGG → LAX Jul 24, 19:45 UTCJul 25, 01:27 UTC5h 42m
2026-07-24 ASA1505 MCO → SEA Jul 24, 13:15 UTCJul 24, 17:50 UTC4h 35m
2026-07-24 ASA205 SAN → SEA Jul 24, 03:45 UTCJul 24, 04:55 UTC1h 10m
2026-07-23 ASA205 SAN → SEA Jul 23, 23:35 UTCJul 24, 00:00 UTC25m
2026-07-23 ASA222 SAN → AUS Jul 23, 21:55 UTCJul 23, 22:05 UTC10m
2026-07-23 ASA222 SAN → AUS Jul 23, 16:40 UTCJul 23, 17:15 UTC35m
2026-07-23 ASA484 OGG → SAN Jul 23, 13:10 UTCJul 23, 13:55 UTC45m
2026-07-23 ASA483 PDX → CUN Jul 23, 07:40 UTCJul 23, 07:50 UTC10m
2026-07-23 ASA483 PDX → CUN Jul 23, 02:35 UTCJul 23, 03:10 UTC35m
2026-07-22 ASA1432 LAX → PDX Jul 22, 21:50 UTCJul 23, 00:25 UTC2h 35m
2026-07-22 ASA1468 SEA → LAX Jul 22, 17:35 UTCJul 22, 18:55 UTC1h 20m
2026-07-22 ASA682 SEA → DEN Jul 22, 14:40 UTCJul 22, 16:10 UTC1h 30m
2026-07-22 ASA309 IAD → LAX Jul 22, 00:00 UTCJul 22, 05:10 UTC5h 10m
2026-07-21 ASA420 SEA → ORD Jul 21, 17:25 UTCJul 21, 22:30 UTC5h 5m
2026-07-21 ASA701 LAS → SEA Jul 21, 13:20 UTCJul 21, 15:15 UTC1h 55m
2026-07-21 ASA531 LAX → PDX Jul 21, 01:00 UTCJul 21, 02:50 UTC1h 50m
2026-07-21 ASA531 LAX → PDX Jul 21, 00:55 UTCJul 21, 02:39 UTC1h 44m
2026-07-20 ASA1633 SJC → PDX Jul 20, 21:40 UTCJul 20, 22:55 UTC1h 15m
2026-07-20 ASA1632 PDX → SJC Jul 20, 18:55 UTCJul 20, 20:20 UTC1h 25m
2026-07-20 ASA349 - Jul 20, 15:15 UTCJul 20, 16:55 UTC1h 40m
2026-07-20 ASA349 LAS → PDX Jul 20, 15:12 UTCJul 20, 16:57 UTC1h 45m
2026-07-20 ASA1636 ANC → LAS Jul 20, 08:45 UTCJul 20, 13:40 UTC4h 55m
2026-07-20 ASA1636 ANC → LAS Jul 20, 08:42 UTCJul 20, 13:31 UTC4h 49m
2026-07-20 ASA67 SEA → KTN Jul 20, 05:20 UTCJul 20, 06:45 UTC1h 25m
2026-07-20 ASA67 SEA → KTN Jul 20, 03:40 UTCJul 20, 03:55 UTC15m
2026-07-20 ASA67 SEA → KTN Jul 20, 01:45 UTCJul 20, 02:10 UTC25m
2026-07-19 ASA67 - Jul 19, 22:50 UTCJul 20, 00:10 UTC1h 20m
2026-07-19 ASA475 - Jul 19, 18:50 UTCJul 19, 21:00 UTC2h 10m
2026-07-19 ASA1471 SEA → SAN Jul 19, 14:55 UTCJul 19, 17:25 UTC2h 30m
2026-07-19 ASA532 MSP → SEA Jul 19, 01:45 UTCJul 19, 05:05 UTC3h 20m
2026-07-18 ASA527 SNA → SEA Jul 18, 21:06 UTCJul 18, 23:29 UTC2h 23m
2026-07-18 ASA527 SNA → SEA Jul 18, 20:55 UTCJul 18, 23:40 UTC2h 45m
2026-07-18 ASA637 - Jul 18, 16:45 UTCJul 18, 19:15 UTC2h 30m
2026-07-18 ASA746 PDX → PHX Jul 18, 02:45 UTCJul 18, 05:25 UTC2h 41m
2026-07-17 ASA1302 - Jul 17, 23:00 UTCJul 18, 00:10 UTC1h 10m
2026-07-17 ASA655 SEA → SFO Jul 17, 19:40 UTCJul 17, 21:30 UTC1h 50m
2026-07-17 ASA512 - Jul 17, 14:50 UTCJul 17, 16:59 UTC2h 10m
2026-07-17 ASA512 SAN → SEA Jul 17, 14:48 UTCJul 17, 16:55 UTC2h 7m
2026-07-17 ASA201 IAD → SAN Jul 17, 00:50 UTCJul 17, 05:25 UTC4h 35m
2026-07-16 ASA506 - Jul 16, 18:00 UTCJul 16, 22:35 UTC4h 35m

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 N953AK page for operator, model, and routing details .

Mode-S AD3FD6 frequently asked

What is Mode-S code AD3FD6?
AD3FD6 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N953AK.
Where is Mode-S AD3FD6 registered?
Mode-S code AD3FD6 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 AD3FD6 broadcasting right now?
Yes. Mode-S AD3FD6 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AD3FD6, octal 53237726, decimal 11,354,070.
What flights does AD3FD6 operate?
Mode-S AD3FD6 has broadcast 20 distinct callsigns, including ASA463, ASA531, ASA24, ASA762, ASA638.