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sensors Mode-S transponder

A52E54

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N433AS · BOEING 737-900 · operated by ALASKA AIRLINES INC

Hex
A52E54
Octal
51227124
Decimal
10,825,300
Country
US
Tail
N433AS
Type
B739
No current signal · last broadcast Jul 26, 19:00 UTC
Flights observed
477
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 19:00 UTC

Last known position

Most recent position reported by Mode-S A52E54.

Country allocation

The ICAO 24-bit address A52E54 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
ASA399 - 7 2026-07-09
ASA254 - 6 2026-06-27
ASA693 - 5 2026-06-25
ASA462 - 5 2026-06-22
ASA266 - 5 2026-06-26
ASA758 Alaska Airlines 4 2026-07-18
ASA755 Alaska Airlines 4 2026-04-16
ASA513 - 4 2026-07-06
ASA477 Alaska Airlines 4 2026-05-14
ASA403 Alaska Airlines 4 2026-06-10
ASA270 - 4 2026-07-01
ASA1619 Alaska Airlines 4 2026-06-26
ASA1396 - 4 2026-06-16
ASA1332 - 4 2026-07-02
ASA706 Alaska Airlines 3 2026-05-12
ASA667 - 3 2026-07-07
ASA658 Alaska Airlines 3 2026-05-16
ASA654 - 3 2026-06-28
ASA643 - 3 2026-06-26
ASA641 - 3 2026-06-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA1418 LAX → GDL Jul 26, 17:35 UTCJul 26, 19:00 UTC1h 25m
2026-07-26 ASA763 LAX → SFO Jul 26, 01:55 UTCJul 26, 03:05 UTC1h 10m
2026-07-25 ASA763 LAX → SFO Jul 25, 22:25 UTCJul 25, 22:40 UTC15m
2026-07-25 ASA1416 SJC → GDL Jul 25, 15:35 UTCJul 25, 20:55 UTC5h 20m
2026-07-25 ASA1624 SAN → SJC Jul 25, 05:40 UTCJul 25, 06:35 UTC55m
2026-07-25 ASA203 SEA → SJC Jul 25, 02:40 UTCJul 25, 03:25 UTC45m
2026-07-24 ASA245 SEA → OGG Jul 24, 20:45 UTCJul 24, 21:00 UTC15m
2026-07-24 ASA245 SEA → OGG Jul 24, 15:20 UTCJul 24, 16:05 UTC45m
2026-07-23 ASA419 SFO → LAS Jul 23, 21:10 UTCJul 24, 02:35 UTC5h 25m
2026-07-23 ASA300 SAN → LIH Jul 23, 14:25 UTCJul 23, 19:25 UTC5h 0m
2026-07-23 ASA662 PHX → PDX Jul 23, 01:20 UTCJul 23, 03:35 UTC2h 15m
2026-07-22 ASA700 SEA → PHX Jul 22, 21:35 UTCJul 23, 00:05 UTC2h 30m
2026-07-22 ASA656 LAX → SFO Jul 22, 18:20 UTCJul 22, 19:45 UTC1h 25m
2026-07-22 ASA725 LAS → PDX Jul 22, 15:05 UTCJul 22, 17:00 UTC1h 55m
2026-07-22 ASA98 ADQ → ANC Jul 22, 11:10 UTCJul 22, 13:10 UTC2h 0m
2026-07-22 ASA771 ORD → SFO Jul 22, 05:10 UTCJul 22, 05:25 UTC15m
2026-07-22 ASA1413 GDL → LAX Jul 22, 00:45 UTCJul 22, 02:15 UTC1h 30m
2026-07-21 ASA1366 SJD → LAX Jul 21, 21:45 UTCJul 21, 23:35 UTC1h 50m
2026-07-21 ASA275 LAX → SEA Jul 21, 16:05 UTCJul 21, 19:30 UTC3h 25m
2026-07-21 ASA1880 SFO → PHX Jul 21, 04:05 UTCJul 21, 04:50 UTC45m
2026-07-21 ASA1880 SFO → PHX Jul 21, 03:56 UTCJul 21, 07:10 UTC3h 14m
2026-07-21 ASA697 MSO → SEA Jul 21, 00:45 UTCJul 21, 01:50 UTC1h 5m
2026-07-20 ASA697 MSO → SEA Jul 20, 22:25 UTCJul 20, 23:15 UTC50m
2026-07-20 ASA493 DEN → SEA Jul 20, 03:35 UTCJul 20, 06:00 UTC2h 25m
2026-07-19 ASA602 SEA → DEN Jul 19, 23:40 UTCJul 20, 01:40 UTC2h 0m
2026-07-19 ASA602 SEA → DEN Jul 19, 23:36 UTCJul 20, 01:37 UTC2h 1m
2026-07-19 ASA1305 - Jul 19, 20:20 UTCJul 19, 22:15 UTC1h 55m
2026-07-19 ASA1602 - Jul 19, 17:55 UTCJul 19, 18:50 UTC55m
2026-07-19 ASA526 - Jul 19, 15:05 UTCJul 19, 16:35 UTC1h 30m
2026-07-19 ASA526 PDX → SFO Jul 19, 14:39 UTCJul 19, 16:28 UTC1h 49m
2026-07-19 ASA1566 - Jul 19, 12:05 UTCJul 19, 12:55 UTC50m
2026-07-19 ASA1566 BOI → PDX Jul 19, 12:02 UTCJul 19, 12:56 UTC54m
2026-07-19 ASA1504 FAI → SEA Jul 19, 02:30 UTCJul 19, 06:10 UTC3h 40m
2026-07-18 ASA1503 - Jul 18, 21:00 UTCJul 19, 01:00 UTC4h 0m
2026-07-18 ASA428 AUS → SEA Jul 18, 18:20 UTCJul 18, 19:15 UTC55m
2026-07-18 ASA799 - Jul 18, 14:10 UTCJul 18, 16:40 UTC2h 30m
2026-07-18 ASA644 SEA → PHX Jul 18, 04:15 UTCJul 18, 06:50 UTC2h 35m
2026-07-18 ASA758 SFO → SEA Jul 18, 01:05 UTCJul 18, 02:35 UTC1h 30m
2026-07-18 ASA758 SFO → SEA Jul 18, 01:12 UTCJul 18, 02:20 UTC1h 8m
2026-07-17 ASA236 SFO → LAS Jul 17, 22:15 UTCJul 17, 23:45 UTC1h 30m
2026-07-17 ASA236 SFO → LAS Jul 17, 22:12 UTCJul 17, 23:40 UTC1h 28m
2026-07-17 ASA684 DEN → PDX Jul 17, 18:19 UTCJul 17, 20:35 UTC2h 15m
2026-07-17 ASA684 DEN → PDX Jul 17, 18:28 UTCJul 17, 20:30 UTC2h 2m
2026-07-17 ASA401 DAL → SFO Jul 17, 14:39 UTCJul 17, 16:44 UTC2h 5m
2026-07-16 ASA253 KOA → PDX Jul 16, 22:05 UTCJul 17, 03:14 UTC5h 10m
2026-07-16 ASA252 - Jul 16, 20:25 UTCJul 16, 20:45 UTC20m
2026-07-16 ASA252 - Jul 16, 15:19 UTCJul 16, 16:09 UTC50m
2026-07-16 ASA558 - Jul 16, 11:25 UTCJul 16, 12:14 UTC50m
2026-07-15 ASA223 - Jul 15, 21:35 UTCJul 15, 22:30 UTC55m
2026-07-15 ASA223 SEA → OGG Jul 15, 21:21 UTCJul 16, 02:52 UTC5h 31m

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 N433AS page for operator, model, and routing details .

Mode-S A52E54 frequently asked

What is Mode-S code A52E54?
A52E54 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N433AS.
Where is Mode-S A52E54 registered?
Mode-S code A52E54 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 A52E54 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 19:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A52E54, octal 51227124, decimal 10,825,300.
What flights does A52E54 operate?
Mode-S A52E54 has broadcast 20 distinct callsigns, including ASA399, ASA254, ASA693, ASA462, ASA266.