Apparatus

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sensors Mode-S transponder

A9873D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N713AL · BOEING 737 MAX 9 · operated by ALASKA AIRLINES INC

Hex
A9873D
Octal
52303475
Decimal
11,110,205
Country
US
Tail
N713AL
Type
B39M
Broadcasting now · callsign ASA412 · 15,025 ft
Flights observed
372
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:05 UTC

Current position

A9873D is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A9873D 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
ASA1406 Alaska Airlines 6 2026-06-04
ASA211 Alaska Airlines 5 2026-05-23
ASA771 Alaska Airlines 4 2026-04-15
ASA737 Alaska Airlines 4 2026-06-13
ASA535 - 4 2026-07-04
ASA412 Alaska Airlines 4 2026-07-18
ASA41 Alaska Airlines 4 2026-05-23
ASA395 Alaska Airlines 4 2026-04-15
ASA363 Alaska Airlines 4 2026-07-20
ASA324 Alaska Airlines 4 2026-07-25
ASA236 Alaska Airlines 4 2026-06-11
ASA79 Alaska Airlines 3 2026-07-20
ASA781 Alaska Airlines 3 2026-05-11
ASA720 - 3 2026-07-13
ASA648 Alaska Airlines 3 2026-04-15
ASA62 Alaska Airlines 3 2026-07-26
ASA587 - 3 2026-07-11
ASA488 - 3 2026-07-13
ASA442 Alaska Airlines 3 2026-06-30
ASA437 - 3 2026-07-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA62 KTN → SEA Jul 26, 19:45 UTCJul 26, 20:05 UTC20m
2026-07-26 ASA62 KTN → SEA Jul 26, 17:55 UTCJul 26, 18:10 UTC15m
2026-07-26 ASA62 KTN → SEA Jul 26, 15:20 UTCJul 26, 16:35 UTC1h 15m
2026-07-26 ASA669 RNO → SEA Jul 26, 06:25 UTCJul 26, 09:20 UTC2h 56m
2026-07-26 ASA1645 ORD → SEA Jul 26, 00:25 UTCJul 26, 04:25 UTC4h 0m
2026-07-25 ASA324 SEA → SJC Jul 25, 19:40 UTCJul 25, 23:05 UTC3h 25m
2026-07-25 ASA1490 OGG → PDX Jul 25, 01:20 UTCJul 25, 02:05 UTC45m
2026-07-24 ASA1490 OGG → PDX Jul 24, 21:12 UTCJul 25, 02:06 UTC4h 54m
2026-07-24 ASA739 SEA → SJC Jul 24, 14:15 UTCJul 24, 15:05 UTC50m
2026-07-24 ASA1397 CUN → SAN Jul 24, 01:50 UTCJul 24, 03:35 UTC1h 45m
2026-07-24 ASA1397 CUN → SAN Jul 24, 01:45 UTCJul 24, 03:34 UTC1h 49m
2026-07-23 ASA56 LAX → PDX Jul 23, 19:35 UTCJul 24, 00:20 UTC4h 45m
2026-07-23 ASA1615 PDX → ANC Jul 23, 14:35 UTCJul 23, 18:00 UTC3h 25m
2026-07-23 ASA1520 LAX → SFO Jul 23, 09:30 UTCJul 23, 12:45 UTC3h 15m
2026-07-23 ASA1880 SFO → PHX Jul 23, 04:30 UTCJul 23, 07:50 UTC3h 20m
2026-07-22 ASA419 SFO → LAS Jul 22, 21:30 UTCJul 23, 02:45 UTC5h 15m
2026-07-22 ASA300 PDX → MCO Jul 22, 14:55 UTCJul 22, 19:34 UTC4h 39m
2026-07-22 ASA300 PDX → MCO Jul 22, 14:55 UTCJul 22, 19:45 UTC4h 50m
2026-07-22 ASA662 PHX → PDX Jul 22, 01:10 UTCJul 22, 03:40 UTC2h 30m
2026-07-21 ASA700 SEA → PHX Jul 21, 21:05 UTCJul 22, 00:00 UTC2h 55m
2026-07-21 ASA623 PVR → SFO Jul 21, 14:40 UTCJul 21, 18:55 UTC4h 15m
2026-07-21 ASA416 SEA → BNA Jul 21, 01:15 UTCJul 21, 04:55 UTC3h 40m
2026-07-20 ASA363 SAN → AUS Jul 20, 20:29 UTCJul 20, 23:34 UTC3h 5m
2026-07-20 ASA363 SAN → AUS Jul 20, 20:30 UTCJul 20, 23:40 UTC3h 10m
2026-07-20 ASA79 SJC → PVR Jul 20, 15:20 UTCJul 20, 18:20 UTC3h 0m
2026-07-20 ASA244 OGG → SEA Jul 20, 05:35 UTCJul 20, 06:25 UTC50m
2026-07-20 ASA244 OGG → SEA Jul 20, 01:32 UTCJul 20, 06:20 UTC4h 48m
2026-07-19 ASA254 - Jul 19, 18:35 UTCJul 19, 19:10 UTC35m
2026-07-19 ASA708 HNL → SFO Jul 19, 11:55 UTCJul 19, 16:05 UTC4h 10m
2026-07-19 ASA394 SEA → MCO Jul 19, 04:50 UTCJul 19, 09:45 UTC4h 55m
2026-07-18 ASA412 SEA → PIT Jul 18, 22:20 UTCJul 19, 03:05 UTC4h 45m
2026-07-18 ASA412 SEA → PIT Jul 18, 17:00 UTCJul 18, 20:55 UTC3h 55m
2026-07-18 ASA440 MIA → PDX Jul 18, 11:20 UTCJul 18, 15:05 UTC3h 45m
2026-07-18 ASA307 SEA → MKE Jul 18, 01:39 UTCJul 18, 05:05 UTC3h 26m
2026-07-17 ASA618 LAS → SEA Jul 17, 20:10 UTCJul 17, 23:45 UTC3h 35m
2026-07-17 ASA618 LAS → SEA Jul 17, 15:15 UTCJul 17, 18:34 UTC3h 20m
2026-07-17 ASA244 - Jul 17, 05:39 UTCJul 17, 06:35 UTC55m
2026-07-16 ASA254 - Jul 16, 23:44 UTCJul 16, 23:55 UTC10m
2026-07-16 ASA254 - Jul 16, 18:34 UTCJul 16, 19:10 UTC35m
2026-07-16 ASA708 MCO → SAN Jul 16, 12:05 UTCJul 16, 16:30 UTC4h 25m
2026-07-16 ASA394 SEA → MCO Jul 16, 05:10 UTCJul 16, 10:25 UTC5h 15m
2026-07-15 ASA412 - Jul 15, 22:35 UTCJul 16, 03:05 UTC4h 30m
2026-07-15 ASA412 - Jul 15, 17:10 UTCJul 15, 21:15 UTC4h 5m
2026-07-15 ASA323 - Jul 15, 13:20 UTCJul 15, 14:35 UTC1h 15m
2026-07-15 ASA598 - Jul 15, 00:30 UTCJul 15, 01:55 UTC1h 25m
2026-07-14 ASA23 JFK → SEA Jul 14, 17:20 UTCJul 14, 22:30 UTC5h 10m
2026-07-13 ASA16 SEA → JFK Jul 13, 21:35 UTCJul 14, 02:25 UTC4h 50m
2026-07-13 ASA720 BUR → SEA Jul 13, 17:20 UTCJul 13, 19:15 UTC1h 55m
2026-07-13 ASA488 SEA → BUR Jul 13, 14:08 UTCJul 13, 16:04 UTC1h 56m
2026-07-13 ASA488 - Jul 13, 13:50 UTCJul 13, 16:05 UTC2h 15m

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 N713AL page for operator, model, and routing details .

Mode-S A9873D frequently asked

What is Mode-S code A9873D?
A9873D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N713AL.
Where is Mode-S A9873D registered?
Mode-S code A9873D 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 A9873D broadcasting right now?
Yes. Mode-S A9873D is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9873D, octal 52303475, decimal 11,110,205.
What flights does A9873D operate?
Mode-S A9873D has broadcast 20 distinct callsigns, including ASA1406, ASA211, ASA771, ASA737, ASA535.