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sensors Mode-S transponder

A99D87

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N719AL · operated by ALASKA AIRLINES INC

Hex
A99D87
Octal
52316607
Decimal
11,115,911
Country
US
Tail
N719AL
Type
B39M
Broadcasting now · callsign ASA26 · 35,000 ft
Flights observed
325
Distinct callsigns
20
Country
US
Last broadcast
19m ago

Current position

A99D87 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A99D87 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
ASA62 Alaska Airlines 8 2026-07-05
ASA50 - 7 2026-07-05
ASA49 - 6 2026-07-05
ASA680 Alaska Airlines 4 2026-05-24
ASA459 - 4 2026-07-09
ASA305 Alaska Airlines 4 2026-04-30
ASA9640 Alaska Airlines 3 2026-05-28
ASA646 Alaska Airlines 3 2026-04-17
ASA602 Alaska Airlines 3 2026-06-14
ASA516 Alaska Airlines 3 2026-06-29
ASA515 Alaska Airlines 3 2026-04-16
ASA504 Alaska Airlines 3 2026-04-21
ASA430 Alaska Airlines 3 2026-06-13
ASA40 Alaska Airlines 3 2026-06-03
ASA246 Alaska Airlines 3 2026-06-06
ASA244 - 3 2026-07-14
ASA239 - 3 2026-07-12
ASA223 - 3 2026-06-27
ASA172 Alaska Airlines 3 2026-04-16
ASA17 Alaska Airlines 3 2026-06-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 ASA26 - Jul 14, 14:25 UTCJul 14, 17:45 UTC3h 20m
2026-07-14 ASA244 - Jul 14, 05:45 UTCJul 14, 06:30 UTC45m
2026-07-13 ASA254 SAN → OGG Jul 13, 18:48 UTCJul 13, 23:55 UTC5h 7m
2026-07-13 ASA254 - Jul 13, 18:50 UTCJul 13, 19:20 UTC30m
2026-07-13 ASA708 MCO → SAN Jul 13, 12:00 UTCJul 13, 16:20 UTC4h 20m
2026-07-13 ASA394 SEA → MCO Jul 13, 05:25 UTCJul 13, 10:15 UTC4h 50m
2026-07-12 ASA356 - Jul 12, 20:55 UTCJul 13, 02:25 UTC5h 30m
2026-07-12 ASA239 - Jul 12, 18:45 UTCJul 12, 18:55 UTC10m
2026-07-12 ASA239 SEA → EWR Jul 12, 14:15 UTCJul 12, 18:55 UTC4h 40m
2026-07-12 ASA239 SEA → EWR Jul 12, 14:15 UTCJul 12, 18:30 UTC4h 15m
2026-07-12 ASA501 - Jul 12, 01:10 UTCJul 12, 04:30 UTC3h 20m
2026-07-11 ASA497 - Jul 11, 20:45 UTCJul 11, 23:40 UTC2h 55m
2026-07-11 ASA275 FAI → SEA Jul 11, 16:10 UTCJul 11, 19:20 UTC3h 10m
2026-07-11 ASA275 FAI → SEA Jul 11, 16:09 UTCJul 11, 19:13 UTC3h 4m
2026-07-11 ASA1521 PDX → FAI Jul 11, 05:15 UTCJul 11, 08:35 UTC3h 20m
2026-07-11 ASA649 BUR → PDX Jul 11, 01:20 UTCJul 11, 03:05 UTC1h 45m
2026-07-10 ASA1386 PDX → BUR Jul 10, 22:10 UTCJul 11, 00:05 UTC1h 55m
2026-07-10 ASA251 GEG → PDX Jul 10, 20:00 UTCJul 10, 20:50 UTC50m
2026-07-10 ASA250 PDX → GEG Jul 10, 18:00 UTCJul 10, 18:45 UTC45m
2026-07-10 ASA511 - Jul 10, 14:15 UTCJul 10, 16:40 UTC2h 25m
2026-07-10 ASA1550 ANC → PHX Jul 10, 07:30 UTCJul 10, 12:45 UTC5h 15m
2026-07-10 ASA661 SEA → ANC Jul 10, 02:25 UTCJul 10, 05:30 UTC3h 5m
2026-07-10 ASA661 SEA → ANC Jul 10, 02:24 UTCJul 10, 05:20 UTC2h 56m
2026-07-09 ASA698 LAS → SEA Jul 9, 23:00 UTCJul 10, 01:10 UTC2h 10m
2026-07-09 ASA738 SEA → LAS Jul 9, 19:00 UTCJul 9, 20:55 UTC1h 55m
2026-07-09 ASA459 BOS → SEA Jul 9, 11:40 UTCJul 9, 17:20 UTC5h 40m
2026-07-09 ASA255 SAN → BNH Jul 9, 04:05 UTCJul 9, 09:30 UTC5h 25m
2026-07-08 ASA389 - Jul 8, 21:00 UTCJul 9, 02:15 UTC5h 15m
2026-07-08 ASA358 PDX → BOS Jul 8, 14:35 UTCJul 8, 19:30 UTC4h 55m
2026-07-08 ASA1609 ANC → PDX Jul 8, 00:55 UTCJul 8, 04:05 UTC3h 10m
2026-07-07 ASA657 SEA → ANC Jul 7, 19:50 UTCJul 7, 22:55 UTC3h 5m
2026-07-07 ASA215 AUS → SEA Jul 7, 14:40 UTCJul 7, 18:25 UTC3h 45m
2026-07-07 ASA1370 PDX → AUS Jul 7, 01:15 UTCJul 7, 04:40 UTC3h 25m
2026-07-06 ASA267 ANC → PDX Jul 6, 20:30 UTCJul 6, 23:50 UTC3h 20m
2026-07-06 ASA1541 MSP → ANC Jul 6, 13:25 UTCJul 6, 18:55 UTC5h 30m
2026-07-06 ASA1540 - Jul 6, 06:10 UTCJul 6, 11:05 UTC4h 55m
2026-07-06 ASA767 - Jul 6, 01:25 UTCJul 6, 04:25 UTC3h 0m
2026-07-05 ASA62 KTN → SEA Jul 5, 22:00 UTCJul 5, 23:25 UTC1h 25m
2026-07-05 ASA62 KTN → SEA Jul 5, 20:00 UTCJul 5, 20:25 UTC25m
2026-07-05 ASA62 KTN → SEA Jul 5, 18:10 UTCJul 5, 18:25 UTC15m
2026-07-05 ASA62 KTN → SEA Jul 5, 15:15 UTCJul 5, 16:30 UTC1h 15m
2026-07-05 ASA50 - Jul 5, 12:45 UTCJul 5, 13:35 UTC50m
2026-07-05 ASA50 - Jul 5, 07:55 UTCJul 5, 08:10 UTC15m
2026-07-05 ASA49 - Jul 5, 05:25 UTCJul 5, 05:40 UTC15m
2026-07-05 ASA49 - Jul 5, 00:05 UTCJul 5, 00:55 UTC50m
2026-07-04 ASA83 SEA → ANC Jul 4, 18:50 UTCJul 4, 22:00 UTC3h 10m
2026-07-04 ASA1473 KOA → SEA Jul 4, 13:35 UTCJul 4, 15:55 UTC2h 20m
2026-07-04 ASA1472 - Jul 4, 04:35 UTCJul 4, 06:45 UTC2h 10m
2026-07-04 ASA1413 SJC → SEA Jul 4, 00:30 UTCJul 4, 02:15 UTC1h 45m
2026-07-03 ASA1366 SEA → SJC Jul 3, 21:50 UTCJul 3, 23:30 UTC1h 40m

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 N719AL page for operator, model, and routing details .

Mode-S A99D87 frequently asked

What is Mode-S code A99D87?
A99D87 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N719AL.
Where is Mode-S A99D87 registered?
Mode-S code A99D87 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 A99D87 broadcasting right now?
Yes. Mode-S A99D87 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A99D87, octal 52316607, decimal 11,115,911.
What flights does A99D87 operate?
Mode-S A99D87 has broadcast 20 distinct callsigns, including ASA62, ASA50, ASA49, ASA680, ASA459.