Apparatus

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sensors Mode-S transponder

ADA51E

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N979AK · BOEING 737 MAX 9 · operated by ALASKA AIRLINES INC

Hex
ADA51E
Octal
53322436
Decimal
11,379,998
Country
US
Tail
N979AK
Type
B39M
No current signal · last broadcast Jul 26, 17:50 UTC
Flights observed
402
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 17:50 UTC

Last known position

Most recent position reported by Mode-S ADA51E.

Country allocation

The ICAO 24-bit address ADA51E 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
ASA450 - 9 2026-07-06
ASA216 Alaska Airlines 8 2026-04-23
ASA200 - 8 2026-07-14
ASA31 Alaska Airlines 6 2026-07-24
ASA703 Alaska Airlines 5 2026-06-09
ASA625 Alaska Airlines 5 2026-07-23
ASA222 Alaska Airlines 5 2026-07-22
ASA708 Alaska Airlines 4 2026-06-06
ASA679 Alaska Airlines 4 2026-05-24
ASA624 Alaska Airlines 4 2026-07-23
ASA62 - 4 2026-07-19
ASA513 - 4 2026-07-14
ASA490 - 4 2026-07-09
ASA451 - 4 2026-07-09
ASA369 - 4 2026-07-08
ASA305 Alaska Airlines 4 2026-07-03
ASA202 Alaska Airlines 4 2026-07-26
ASA92 Alaska Airlines 3 2026-06-09
ASA784 - 3 2026-07-16
ASA742 - 3 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA246 SJC → PDX Jul 26, 17:40 UTCJul 26, 22:39 UTC4h 59m
2026-07-26 ASA202 SEA → SNA Jul 26, 07:35 UTCJul 26, 07:55 UTC20m
2026-07-26 ASA202 SEA → SNA Jul 26, 02:20 UTCJul 26, 03:10 UTC50m
2026-07-26 ASA202 SEA → SNA Jul 26, 02:19 UTCJul 26, 07:43 UTC5h 24m
2026-07-25 ASA582 SAN → PDX Jul 25, 22:00 UTCJul 26, 00:00 UTC2h 0m
2026-07-25 ASA692 PDX → SFO Jul 25, 18:10 UTCJul 25, 20:20 UTC2h 10m
2026-07-25 ASA640 LAX → SFO Jul 25, 11:25 UTCJul 25, 16:40 UTC5h 15m
2026-07-25 ASA639 PHX → SEA Jul 25, 04:40 UTCJul 25, 09:25 UTC4h 45m
2026-07-24 ASA31 JFK → SEA Jul 24, 20:45 UTCJul 25, 02:30 UTC5h 45m
2026-07-24 ASA26 SEA → ORD Jul 24, 14:10 UTCJul 24, 19:00 UTC4h 50m
2026-07-24 ASA90 FAI → ANC Jul 24, 05:25 UTCJul 24, 06:25 UTC1h 0m
2026-07-23 ASA626 SFO → SEA Jul 23, 23:30 UTCJul 23, 23:40 UTC10m
2026-07-23 ASA626 SFO → SEA Jul 23, 18:15 UTCJul 23, 19:05 UTC50m
2026-07-23 ASA625 PHX → SEA Jul 23, 11:30 UTCJul 23, 15:45 UTC4h 15m
2026-07-23 ASA624 SEA → IND Jul 23, 06:30 UTCJul 23, 10:00 UTC3h 30m
2026-07-22 ASA205 SAN → SEA Jul 22, 23:40 UTCJul 23, 05:10 UTC5h 30m
2026-07-22 ASA222 SAN → AUS Jul 22, 21:55 UTCJul 22, 22:05 UTC10m
2026-07-22 ASA222 SAN → AUS Jul 22, 16:42 UTCJul 22, 21:54 UTC5h 12m
2026-07-22 ASA222 SAN → AUS Jul 22, 16:40 UTCJul 22, 17:10 UTC30m
2026-07-22 ASA9233 SJD → SFO Jul 22, 00:55 UTCJul 22, 05:25 UTC4h 30m
2026-07-21 ASA9231 MCO → SFO Jul 21, 17:45 UTCJul 21, 23:30 UTC5h 45m
2026-07-21 ASA1470 ORD → SAN Jul 21, 11:30 UTCJul 21, 15:05 UTC3h 35m
2026-07-21 ASA376 SFO → LAX Jul 21, 06:10 UTCJul 21, 09:25 UTC3h 15m
2026-07-20 ASA19 JFK → PDX Jul 20, 22:20 UTCJul 21, 04:00 UTC5h 39m
2026-07-20 ASA20 SFO → JFK Jul 20, 14:40 UTCJul 20, 19:40 UTC5h 0m
2026-07-20 ASA791 EWR → SEA Jul 20, 00:50 UTCJul 20, 02:45 UTC1h 55m
2026-07-19 ASA62 - Jul 19, 21:25 UTCJul 19, 22:55 UTC1h 30m
2026-07-19 ASA62 - Jul 19, 19:40 UTCJul 19, 20:10 UTC30m
2026-07-19 ASA62 - Jul 19, 18:00 UTCJul 19, 18:20 UTC20m
2026-07-19 ASA62 - Jul 19, 15:20 UTCJul 19, 16:40 UTC1h 20m
2026-07-19 ASA50 - Jul 19, 11:50 UTCJul 19, 12:40 UTC50m
2026-07-19 ASA50 - Jul 19, 07:30 UTCJul 19, 07:40 UTC10m
2026-07-19 ASA49 SNA → PDX Jul 19, 00:10 UTCJul 19, 06:10 UTC6h 0m
2026-07-18 ASA775 PDX → ANC Jul 18, 18:20 UTCJul 18, 21:42 UTC3h 22m
2026-07-18 ASA775 PDX → ANC Jul 18, 18:25 UTCJul 18, 21:45 UTC3h 20m
2026-07-18 ASA1626 DEN → PDX Jul 18, 14:25 UTCJul 18, 16:45 UTC2h 20m
2026-07-18 ASA752 ANC → DEN Jul 18, 07:20 UTCJul 18, 12:15 UTC4h 55m
2026-07-18 ASA352 ANC → SEA Jul 18, 02:09 UTCJul 18, 02:55 UTC46m
2026-07-17 ASA351 LAX → SEA Jul 17, 23:50 UTCJul 18, 00:45 UTC55m
2026-07-17 ASA351 LAX → SEA Jul 17, 23:49 UTCJul 18, 00:37 UTC48m
2026-07-17 ASA657 SEA → ANC Jul 17, 19:35 UTCJul 17, 22:35 UTC3h 0m
2026-07-17 ASA557 - Jul 17, 14:44 UTCJul 17, 17:55 UTC3h 10m
2026-07-17 ASA557 - Jul 17, 13:25 UTCJul 17, 13:55 UTC30m
2026-07-17 ASA556 - Jul 17, 02:34 UTCJul 17, 05:20 UTC2h 45m
2026-07-16 ASA218 ATL → SEA Jul 16, 20:42 UTCJul 17, 00:48 UTC4h 6m
2026-07-16 ASA218 ATL → SEA Jul 16, 20:35 UTCJul 17, 01:05 UTC4h 30m
2026-07-16 ASA784 PDX → ATL Jul 16, 14:45 UTCJul 16, 19:10 UTC4h 25m
2026-07-16 ASA784 PDX → ATL Jul 16, 14:44 UTCJul 16, 19:04 UTC4h 20m
2026-07-16 ASA1609 - Jul 16, 00:45 UTCJul 16, 04:00 UTC3h 15m
2026-07-15 ASA657 SEA → ANC Jul 15, 19:55 UTCJul 15, 23:00 UTC3h 5m

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 N979AK page for operator, model, and routing details .

Mode-S ADA51E frequently asked

What is Mode-S code ADA51E?
ADA51E is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N979AK.
Where is Mode-S ADA51E registered?
Mode-S code ADA51E 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 ADA51E broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 17:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ADA51E, octal 53322436, decimal 11,379,998.
What flights does ADA51E operate?
Mode-S ADA51E has broadcast 20 distinct callsigns, including ASA450, ASA216, ASA200, ASA31, ASA703.