Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A1EFE7

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N224AK · BOEING 737-900 · operated by ALASKA AIRLINES INC

Hex
A1EFE7
Octal
50367747
Decimal
10,612,711
Country
US
Tail
N224AK
Type
B739
No current signal · last broadcast Jul 26, 21:30 UTC
Flights observed
435
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:30 UTC

Last known position

Most recent position reported by Mode-S A1EFE7.

Country allocation

The ICAO 24-bit address A1EFE7 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
ASA668 - 5 2026-07-03
ASA601 - 4 2026-06-18
ASA535 Alaska Airlines 4 2026-04-17
ASA501 - 4 2026-07-06
ASA492 Alaska Airlines 4 2026-06-09
ASA453 - 4 2026-06-23
ASA413 - 4 2026-06-25
ASA379 Alaska Airlines 4 2026-06-01
ASA1396 - 4 2026-06-14
ASA1335 Alaska Airlines 4 2026-04-16
ASA1331 Alaska Airlines 4 2026-05-08
ASA799 - 3 2026-04-17
ASA784 - 3 2026-07-11
ASA767 - 3 2026-07-01
ASA713 Alaska Airlines 3 2026-05-06
ASA647 Alaska Airlines 3 2026-05-17
ASA616 - 3 2026-04-13
ASA585 - 3 2026-06-23
ASA567 Alaska Airlines 3 2026-07-20
ASA565 Alaska Airlines 3 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA262 JFK → SFO Jul 26, 16:40 UTCJul 26, 21:25 UTC4h 45m
2026-07-26 ASA17 JFK → SEA Jul 26, 01:00 UTCJul 26, 06:40 UTC5h 41m
2026-07-25 ASA18 PDX → JFK Jul 25, 18:00 UTCJul 25, 22:35 UTC4h 35m
2026-07-25 ASA399 MCO → SFO Jul 25, 14:35 UTCJul 25, 16:25 UTC1h 50m
2026-07-24 ASA397 MCO → SAN Jul 24, 23:35 UTCJul 25, 04:05 UTC4h 30m
2026-07-24 ASA396 PDX → SJC Jul 24, 17:30 UTCJul 24, 22:00 UTC4h 30m
2026-07-24 ASA1680 SMF → SAN Jul 24, 15:05 UTCJul 24, 16:20 UTC1h 15m
2026-07-24 ASA1427 PVR → SFO Jul 24, 04:25 UTCJul 24, 05:55 UTC1h 30m
2026-07-24 ASA683 LAS → PDX Jul 24, 00:45 UTCJul 24, 02:10 UTC1h 25m
2026-07-24 ASA683 LAS → PDX Jul 24, 00:45 UTCJul 24, 02:05 UTC1h 20m
2026-07-23 ASA681 DEN → SEA Jul 23, 22:10 UTCJul 23, 23:32 UTC1h 22m
2026-07-23 ASA681 DEN → SEA Jul 23, 22:05 UTCJul 23, 23:30 UTC1h 25m
2026-07-23 ASA1477 SFO → SEA Jul 23, 18:10 UTCJul 23, 20:30 UTC2h 20m
2026-07-23 ASA1361 SFO → PVR Jul 23, 14:10 UTCJul 23, 16:35 UTC2h 25m
2026-07-23 ASA304 SEA → LAX Jul 23, 00:20 UTCJul 23, 05:50 UTC5h 30m
2026-07-22 ASA306 PDX → SFO Jul 22, 18:05 UTCJul 22, 22:40 UTC4h 35m
2026-07-22 ASA440 MIA → PDX Jul 22, 11:15 UTCJul 22, 15:20 UTC4h 5m
2026-07-22 ASA307 LAX → SFO Jul 22, 03:35 UTCJul 22, 05:25 UTC1h 50m
2026-07-21 ASA503 LAX → SEA Jul 21, 21:30 UTCJul 22, 01:10 UTC3h 40m
2026-07-21 ASA422 SEA → SFO Jul 21, 16:25 UTCJul 21, 20:05 UTC3h 40m
2026-07-21 ASA1409 GDL → SJC Jul 21, 13:30 UTCJul 21, 14:50 UTC1h 20m
2026-07-21 ASA1621 SAN → SMF Jul 21, 05:00 UTCJul 21, 06:10 UTC1h 10m
2026-07-21 ASA1388 LAX → SJD Jul 21, 01:10 UTCJul 21, 03:40 UTC2h 30m
2026-07-20 ASA567 PDX → SJD Jul 20, 21:20 UTCJul 20, 23:20 UTC2h 0m
2026-07-20 ASA567 PDX → SJD Jul 20, 21:19 UTCJul 20, 23:11 UTC1h 52m
2026-07-20 ASA565 LAX → PDX Jul 20, 17:50 UTCJul 20, 20:05 UTC2h 15m
2026-07-20 ASA565 LAX → PDX Jul 20, 17:50 UTCJul 20, 20:05 UTC2h 15m
2026-07-20 ASA1473 KOA → SEA Jul 20, 13:35 UTCJul 20, 15:45 UTC2h 10m
2026-07-20 ASA573 SJC → SEA Jul 20, 00:15 UTCJul 20, 05:05 UTC4h 50m
2026-07-19 ASA233 - Jul 19, 16:10 UTCJul 19, 21:10 UTC5h 0m
2026-07-19 ASA1620 - Jul 19, 13:35 UTCJul 19, 13:45 UTC10m
2026-07-19 ASA1620 SFO → LAX Jul 19, 13:33 UTCJul 19, 14:18 UTC45m
2026-07-19 ASA59 SEA → ANC Jul 19, 02:45 UTCJul 19, 08:05 UTC5h 20m
2026-07-18 ASA59 SEA → ANC Jul 18, 23:36 UTCJul 19, 08:15 UTC8h 39m
2026-07-18 ASA211 - Jul 18, 05:15 UTCJul 18, 10:15 UTC5h 0m
2026-07-17 ASA421 SEA → SFO Jul 17, 19:15 UTCJul 18, 03:10 UTC7h 56m
2026-07-17 ASA786 BWI → SEA Jul 17, 11:15 UTCJul 17, 16:10 UTC4h 55m
2026-07-17 ASA781 SEA → BWI Jul 17, 04:49 UTCJul 17, 09:15 UTC4h 25m
2026-07-16 ASA450 - Jul 16, 23:05 UTCJul 17, 03:25 UTC4h 20m
2026-07-16 ASA450 SEA → CMH Jul 16, 17:54 UTCJul 16, 21:45 UTC3h 50m
2026-07-16 ASA440 MKE → SEA Jul 16, 11:34 UTCJul 16, 15:14 UTC3h 40m
2026-07-16 ASA307 SEA → MKE Jul 16, 01:25 UTCJul 16, 04:45 UTC3h 20m
2026-07-15 ASA402 - Jul 15, 20:45 UTCJul 15, 23:50 UTC3h 5m
2026-07-15 ASA53 - Jul 15, 14:10 UTCJul 15, 19:05 UTC4h 55m
2026-07-14 ASA437 - Jul 14, 18:45 UTCJul 15, 01:35 UTC6h 49m
2026-07-14 ASA505 - Jul 14, 13:45 UTCJul 14, 16:15 UTC2h 30m
2026-07-14 ASA493 DEN → SEA Jul 14, 03:30 UTCJul 14, 05:45 UTC2h 15m
2026-07-13 ASA602 SEA → DEN Jul 13, 23:45 UTCJul 14, 01:55 UTC2h 10m
2026-07-13 ASA596 - Jul 13, 20:15 UTCJul 13, 21:55 UTC1h 40m
2026-07-13 ASA653 - Jul 13, 17:15 UTCJul 13, 18:25 UTC1h 10m

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 N224AK page for operator, model, and routing details .

Mode-S A1EFE7 frequently asked

What is Mode-S code A1EFE7?
A1EFE7 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N224AK.
Where is Mode-S A1EFE7 registered?
Mode-S code A1EFE7 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 A1EFE7 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1EFE7, octal 50367747, decimal 10,612,711.
What flights does A1EFE7 operate?
Mode-S A1EFE7 has broadcast 20 distinct callsigns, including ASA668, ASA601, ASA535, ASA501, ASA492.