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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 ASA219 · 33,000 ft
Flights observed
409
Distinct callsigns
20
Country
US
Last broadcast
2h ago

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
ASA507 Alaska Airlines 6 2026-06-19
ASA56 Alaska Airlines 5 2026-06-13
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
ASA626 Alaska Airlines 4 2026-05-30
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
ASA1397 Alaska Airlines 4 2026-06-14
ASA748 Alaska Airlines 3 2026-06-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
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
2026-07-14 ASA272 - Jul 14, 00:50 UTCJul 14, 03:50 UTC3h 0m
2026-07-12 ASA99 - Jul 12, 23:20 UTCJul 13, 02:20 UTC3h 0m
2026-07-12 ASA603 PHX → SEA Jul 12, 18:40 UTCJul 12, 21:00 UTC2h 20m
2026-07-12 ASA603 PHX → SEA Jul 12, 18:38 UTCJul 12, 20:54 UTC2h 16m
2026-07-12 ASA632 SEA → PHX Jul 12, 03:10 UTCJul 12, 05:35 UTC2h 25m
2026-07-11 ASA402 - Jul 11, 21:35 UTCJul 12, 00:40 UTC3h 5m
2026-07-11 ASA53 - Jul 11, 14:55 UTCJul 11, 19:35 UTC4h 40m
2026-07-11 ASA53 LAX → ANC Jul 11, 14:50 UTCJul 11, 19:29 UTC4h 39m
2026-07-10 ASA617 - Jul 10, 18:00 UTCJul 11, 07:15 UTC13h 15m
2026-07-10 ASA617 - Jul 10, 01:15 UTCJul 10, 06:15 UTC5h 0m
2026-07-09 ASA1330 - Jul 9, 18:05 UTCJul 9, 22:40 UTC4h 35m
2026-07-09 ASA1330 LAX → LIR Jul 9, 18:01 UTCJul 9, 23:16 UTC5h 15m
2026-07-09 ASA505 SEA → LAX Jul 9, 13:20 UTCJul 9, 15:25 UTC2h 5m
2026-07-09 ASA1509 - Jul 9, 08:35 UTCJul 9, 11:35 UTC3h 0m
2026-07-09 ASA284 SEA → FAI Jul 9, 01:15 UTCJul 9, 04:30 UTC3h 15m
2026-07-09 ASA284 SEA → FAI Jul 9, 01:12 UTCJul 9, 04:30 UTC3h 18m
2026-07-08 ASA405 SEA → OKC Jul 8, 20:10 UTCJul 8, 23:45 UTC3h 35m
2026-07-08 ASA405 SEA → OKC Jul 8, 15:35 UTCJul 8, 18:35 UTC3h 0m
2026-07-08 ASA98 ANC → SEA Jul 8, 09:50 UTCJul 8, 12:40 UTC2h 50m
2026-07-08 ASA771 SEA → ANC Jul 8, 04:43 UTCJul 8, 07:38 UTC2h 55m
2026-07-08 ASA771 - Jul 8, 04:35 UTCJul 8, 07:30 UTC2h 55m
2026-07-08 ASA758 - Jul 8, 01:00 UTCJul 8, 02:35 UTC1h 35m
2026-07-07 ASA236 PDX → SFO Jul 7, 22:10 UTCJul 7, 23:35 UTC1h 25m
2026-07-07 ASA684 DEN → PDX Jul 7, 18:30 UTCJul 7, 20:45 UTC2h 15m
2026-07-07 ASA401 PDX → DEN Jul 7, 14:45 UTCJul 7, 16:45 UTC2h 0m
2026-07-06 ASA646 DFW → PDX Jul 6, 23:00 UTCJul 7, 02:25 UTC3h 25m
2026-07-06 ASA392 PDX → DFW Jul 6, 18:05 UTCJul 6, 21:25 UTC3h 20m
2026-07-06 ASA1629 LAS → PDX Jul 6, 14:15 UTCJul 6, 16:00 UTC1h 45m
2026-07-06 ASA478 SEA → LAS Jul 6, 02:10 UTCJul 6, 04:15 UTC2h 5m
2026-07-05 ASA567 - Jul 5, 21:45 UTCJul 5, 23:40 UTC1h 55m
2026-07-05 ASA565 SEA → ONT Jul 5, 18:20 UTCJul 5, 20:35 UTC2h 15m
2026-07-05 ASA1473 KOA → SEA Jul 5, 13:35 UTCJul 5, 15:45 UTC2h 10m
2026-07-04 ASA25 - Jul 4, 21:40 UTCJul 5, 03:00 UTC5h 20m
2026-07-04 ASA24 SAN → JFK Jul 4, 14:25 UTCJul 4, 19:20 UTC4h 55m
2026-07-04 ASA201 IAD → SAN Jul 4, 00:30 UTCJul 4, 05:20 UTC4h 50m
2026-07-03 ASA506 - Jul 3, 18:40 UTCJul 3, 23:05 UTC4h 25m
2026-07-03 ASA1557 SFO → SAN Jul 3, 15:35 UTCJul 3, 16:45 UTC1h 10m
2026-07-03 ASA628 SEA → SFO Jul 3, 03:25 UTCJul 3, 05:10 UTC1h 45m
2026-07-02 ASA537 BUR → SEA Jul 2, 22:05 UTCJul 3, 00:20 UTC2h 15m
2026-07-02 ASA529 SEA → BUR Jul 2, 18:48 UTCJul 2, 20:36 UTC1h 48m
2026-07-02 ASA529 SEA → BUR Jul 2, 18:35 UTCJul 2, 20:40 UTC2h 5m
2026-07-02 ASA640 TPA → SEA Jul 2, 11:25 UTCJul 2, 16:45 UTC5h 20m
2026-07-02 ASA639 SEA → TPA Jul 2, 04:40 UTCJul 2, 09:40 UTC5h 0m
2026-07-02 ASA758 - Jul 2, 01:05 UTCJul 2, 02:45 UTC1h 40m
2026-07-01 ASA236 PDX → SFO Jul 1, 22:10 UTCJul 1, 23:30 UTC1h 20m
2026-07-01 ASA1467 LAS → PDX Jul 1, 18:10 UTCJul 1, 20:00 UTC1h 50m
2026-07-01 ASA777 - Jul 1, 14:10 UTCJul 1, 16:10 UTC2h 0m
2026-07-01 ASA777 PAE → LAS Jul 1, 14:19 UTCJul 1, 16:10 UTC1h 51m

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 ASA507, ASA56, ASA401, ASA365, ASA313.