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sensors Mode-S transponder

A4DF56

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N413AS · BOEING 737-900 · operated by ALASKA AIRLINES INC

Hex
A4DF56
Octal
51157526
Decimal
10,805,078
Country
US
Tail
N413AS
Type
B739
Broadcasting now · callsign ASA1787 · 35,075 ft
Flights observed
457
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 19:30 UTC

Current position

A4DF56 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A4DF56 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
ASA626 - 8 2026-07-21
ASA507 Alaska Airlines 6 2026-06-19
ASA67 Alaska Airlines 5 2026-07-24
ASA56 Alaska Airlines 5 2026-06-13
ASA483 Alaska Airlines 5 2026-07-26
ASA401 - 5 2026-07-07
ASA365 Alaska Airlines 5 2026-04-25
ASA313 Alaska Airlines 5 2026-05-23
ASA12 Alaska Airlines 5 2026-06-03
ASA725 Alaska Airlines 4 2026-05-24
ASA660 Alaska Airlines 4 2026-06-17
ASA529 - 4 2026-07-02
ASA443 - 4 2026-04-13
ASA412 - 4 2026-06-28
ASA346 Alaska Airlines 4 2026-05-16
ASA322 Alaska Airlines 4 2026-06-07
ASA287 Alaska Airlines 4 2026-04-16
ASA24 Alaska Airlines 4 2026-07-04
ASA201 - 4 2026-07-04
ASA1460 Alaska Airlines 4 2026-05-31

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA1414 SAN → SJD Jul 26, 18:25 UTCJul 26, 19:30 UTC1h 5m
2026-07-26 ASA484 OGG → SAN Jul 26, 13:00 UTCJul 26, 14:05 UTC1h 5m
2026-07-26 ASA483 PDX → CUN Jul 26, 07:35 UTCJul 26, 07:45 UTC10m
2026-07-26 ASA483 PDX → CUN Jul 26, 02:35 UTCJul 26, 03:05 UTC30m
2026-07-25 ASA1425 PVR → SAN Jul 25, 18:20 UTCJul 26, 00:50 UTC6h 30m
2026-07-25 ASA1361 SFO → PVR Jul 25, 13:35 UTCJul 25, 16:05 UTC2h 30m
2026-07-25 ASA282 SAN → EWR Jul 25, 03:55 UTCJul 25, 05:20 UTC1h 25m
2026-07-25 ASA393 JFK → SAN Jul 25, 00:45 UTCJul 25, 02:20 UTC1h 35m
2026-07-24 ASA418 SEA → MSP Jul 24, 19:35 UTCJul 24, 23:00 UTC3h 25m
2026-07-24 ASA418 SEA → MSP Jul 24, 15:00 UTCJul 24, 17:45 UTC2h 45m
2026-07-24 ASA1498 SEA → SFO Jul 24, 09:15 UTCJul 24, 12:05 UTC2h 50m
2026-07-24 ASA1498 SEA → SFO Jul 24, 09:11 UTCJul 24, 11:56 UTC2h 45m
2026-07-24 ASA67 SEA → KTN Jul 24, 05:20 UTCJul 24, 06:50 UTC1h 30m
2026-07-24 ASA67 SEA → KTN Jul 24, 05:16 UTCJul 24, 06:51 UTC1h 35m
2026-07-24 ASA67 SEA → KTN Jul 24, 03:30 UTCJul 24, 03:50 UTC20m
2026-07-24 ASA67 SEA → KTN Jul 24, 01:45 UTCJul 24, 02:15 UTC30m
2026-07-23 ASA67 SEA → KTN Jul 23, 23:00 UTCJul 24, 00:25 UTC1h 25m
2026-07-23 ASA48 ANC → SEA Jul 23, 18:30 UTCJul 23, 21:15 UTC2h 45m
2026-07-23 ASA85 SEA → ANC Jul 23, 13:20 UTCJul 23, 16:40 UTC3h 20m
2026-07-23 ASA329 ORD → SEA Jul 23, 01:56 UTCJul 23, 05:35 UTC3h 39m
2026-07-23 ASA329 ORD → SEA Jul 23, 01:50 UTCJul 23, 05:45 UTC3h 55m
2026-07-22 ASA410 SEA → ORD Jul 22, 20:35 UTCJul 22, 23:50 UTC3h 15m
2026-07-22 ASA753 PSP → SEA Jul 22, 16:15 UTCJul 22, 18:25 UTC2h 10m
2026-07-22 ASA484 OGG → SAN Jul 22, 02:10 UTCJul 22, 13:40 UTC11h 30m
2026-07-21 ASA1432 LAX → PDX Jul 21, 21:45 UTCJul 22, 00:20 UTC2h 35m
2026-07-21 ASA1477 SFO → SEA Jul 21, 17:15 UTCJul 21, 19:30 UTC2h 15m
2026-07-21 ASA1361 SFO → PVR Jul 21, 13:30 UTCJul 21, 16:00 UTC2h 30m
2026-07-21 ASA90 FAI → ANC Jul 21, 06:05 UTCJul 21, 06:55 UTC50m
2026-07-21 ASA626 - Jul 21, 00:10 UTCJul 21, 00:30 UTC20m
2026-07-20 ASA626 - Jul 20, 18:50 UTCJul 20, 19:25 UTC35m
2026-07-20 ASA795 DEN → PDX Jul 20, 15:20 UTCJul 20, 16:40 UTC1h 20m
2026-07-20 ASA638 SEA → TUS Jul 20, 03:05 UTCJul 20, 04:35 UTC1h 30m
2026-07-18 ASA293 GEG → SEA Jul 18, 21:35 UTCJul 18, 22:15 UTC40m
2026-07-18 ASA449 SEA → GEG Jul 18, 19:35 UTCJul 18, 20:15 UTC40m
2026-07-18 ASA563 - Jul 18, 11:20 UTCJul 18, 14:35 UTC3h 15m
2026-07-18 ASA564 - Jul 18, 01:54 UTCJul 18, 04:50 UTC2h 56m
2026-07-17 ASA580 BUR → SEA Jul 17, 20:40 UTCJul 17, 22:35 UTC1h 55m
2026-07-17 ASA426 SEA → BUR Jul 17, 17:09 UTCJul 17, 19:25 UTC2h 15m
2026-07-17 ASA453 - Jul 17, 11:39 UTCJul 17, 15:35 UTC3h 55m
2026-07-17 ASA1573 - Jul 17, 01:49 UTCJul 17, 05:39 UTC3h 50m
2026-07-16 ASA579 - Jul 16, 18:29 UTCJul 16, 22:15 UTC3h 45m
2026-07-16 ASA578 - Jul 16, 13:10 UTCJul 16, 13:30 UTC20m
2026-07-16 ASA578 SEA → ORD Jul 16, 13:06 UTCJul 16, 16:33 UTC3h 27m
2026-07-16 ASA90 - Jul 16, 08:25 UTCJul 16, 09:20 UTC55m
2026-07-16 ASA626 - Jul 16, 02:35 UTCJul 16, 02:45 UTC10m
2026-07-15 ASA626 - Jul 15, 21:15 UTCJul 15, 22:05 UTC50m
2026-07-15 ASA1337 BOS → SEA Jul 15, 00:05 UTCJul 15, 05:35 UTC5h 30m
2026-07-14 ASA219 - Jul 14, 17:40 UTCJul 14, 22:25 UTC4h 45m
2026-07-14 ASA274 - Jul 14, 11:35 UTCJul 14, 15:45 UTC4h 10m
2026-07-14 ASA269 SEA → CLE Jul 14, 06:05 UTCJul 14, 10:00 UTC3h 55m

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 N413AS page for operator, model, and routing details .

Mode-S A4DF56 frequently asked

What is Mode-S code A4DF56?
A4DF56 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N413AS.
Where is Mode-S A4DF56 registered?
Mode-S code A4DF56 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 A4DF56 broadcasting right now?
Yes. Mode-S A4DF56 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4DF56, octal 51157526, decimal 10,805,078.
What flights does A4DF56 operate?
Mode-S A4DF56 has broadcast 20 distinct callsigns, including ASA626, ASA507, ASA67, ASA56, ASA483.