Apparatus

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sensors Mode-S transponder

A61B4E

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N493AS · BOEING 737-900 · operated by ALASKA AIRLINES INC

Hex
A61B4E
Octal
51415516
Decimal
10,885,966
Country
US
Tail
N493AS
Type
B739
Broadcasting now · callsign ASA1449 · 37,000 ft
Flights observed
412
Distinct callsigns
20
Country
US
Last broadcast
20m ago

Current position

A61B4E is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A61B4E 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
ASA252 Alaska Airlines 8 2026-06-13
ASA253 Alaska Airlines 7 2026-06-13
ASA222 - 7 2026-07-10
ASA205 - 6 2026-07-10
ASA62 - 5 2026-07-12
ASA35 Alaska Airlines 5 2026-04-30
ASA1477 Alaska Airlines 5 2026-06-25
ASA731 - 4 2026-07-05
ASA682 - 4 2026-04-16
ASA677 Alaska Airlines 4 2026-04-17
ASA670 - 4 2026-04-17
ASA450 - 4 2026-06-19
ASA42 Alaska Airlines 4 2026-04-14
ASA324 Alaska Airlines 4 2026-06-16
ASA295 - 4 2026-07-13
ASA206 Alaska Airlines 4 2026-06-12
ASA744 - 3 2026-06-16
ASA737 Alaska Airlines 3 2026-05-21
ASA725 Alaska Airlines 3 2026-06-23
ASA691 Alaska Airlines 3 2026-05-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 ASA1449 - Jul 14, 14:50 UTCJul 14, 15:30 UTC40m
2026-07-14 ASA301 MCO → PDX Jul 14, 01:40 UTCJul 14, 07:00 UTC5h 20m
2026-07-13 ASA295 TPA → MCO Jul 13, 23:50 UTCJul 14, 00:10 UTC20m
2026-07-13 ASA295 - Jul 13, 20:10 UTCJul 13, 21:30 UTC1h 20m
2026-07-13 ASA295 SEA → TPA Jul 13, 15:10 UTCJul 13, 19:52 UTC4h 42m
2026-07-13 ASA295 SEA → TPA Jul 13, 15:00 UTCJul 13, 21:30 UTC6h 30m
2026-07-13 ASA1362 - Jul 13, 04:55 UTCJul 13, 06:55 UTC2h 0m
2026-07-13 ASA1362 SAN → SEA Jul 13, 04:52 UTCJul 13, 06:46 UTC1h 54m
2026-07-13 ASA1348 SEA → SAN Jul 13, 01:01 UTCJul 13, 03:30 UTC2h 30m
2026-07-13 ASA1348 SEA → SAN Jul 13, 00:57 UTCJul 13, 03:29 UTC2h 32m
2026-07-12 ASA62 - Jul 12, 21:35 UTCJul 12, 23:15 UTC1h 40m
2026-07-12 ASA62 KTN → SEA Jul 12, 21:42 UTCJul 12, 23:09 UTC1h 27m
2026-07-12 ASA62 - Jul 12, 19:40 UTCJul 12, 20:05 UTC25m
2026-07-12 ASA62 - Jul 12, 17:55 UTCJul 12, 18:10 UTC15m
2026-07-12 ASA62 - Jul 12, 15:15 UTCJul 12, 16:35 UTC1h 20m
2026-07-12 ASA50 - Jul 12, 12:20 UTCJul 12, 13:10 UTC50m
2026-07-12 ASA49 - Jul 12, 05:35 UTCJul 12, 05:50 UTC15m
2026-07-12 ASA49 - Jul 12, 00:20 UTCJul 12, 01:05 UTC45m
2026-07-12 ASA49 ANC → HNL Jul 12, 00:16 UTCJul 12, 05:47 UTC5h 31m
2026-07-11 ASA1810 FAI → ANC Jul 11, 17:35 UTCJul 11, 20:40 UTC3h 5m
2026-07-11 ASA543 DFW → SEA Jul 11, 12:10 UTCJul 11, 15:45 UTC3h 35m
2026-07-11 ASA543 DFW → SEA Jul 11, 12:07 UTCJul 11, 15:34 UTC3h 27m
2026-07-11 ASA542 SEA → DFW Jul 11, 07:15 UTCJul 11, 10:30 UTC3h 15m
2026-07-10 ASA205 KOA → SEA Jul 10, 23:45 UTCJul 11, 05:10 UTC5h 25m
2026-07-10 ASA222 - Jul 10, 22:25 UTCJul 10, 22:30 UTC5m
2026-07-10 ASA222 - Jul 10, 17:05 UTCJul 10, 17:40 UTC35m
2026-07-10 ASA1617 DEN → SAN Jul 10, 12:10 UTCJul 10, 14:10 UTC2h 0m
2026-07-10 ASA310 SEA → DEN Jul 10, 02:40 UTCJul 10, 04:45 UTC2h 5m
2026-07-08 ASA9578 PHL → SEA Jul 8, 23:10 UTCJul 9, 04:50 UTC5h 40m
2026-07-08 ASA1776 PDX → PHL Jul 8, 14:30 UTCJul 8, 19:15 UTC4h 45m
2026-07-07 ASA1434 SJC → SJD Jul 7, 23:40 UTCJul 8, 02:55 UTC3h 15m
2026-07-07 ASA509 SEA → MSP Jul 7, 19:30 UTCJul 7, 22:25 UTC2h 55m
2026-07-07 ASA82 ANC → SEA Jul 7, 14:05 UTCJul 7, 17:10 UTC3h 5m
2026-07-07 ASA1545 ORD → ANC Jul 7, 06:10 UTCJul 7, 12:10 UTC6h 0m
2026-07-07 ASA1493 - Jul 7, 00:45 UTCJul 7, 04:20 UTC3h 35m
2026-07-06 ASA551 - Jul 6, 20:05 UTCJul 6, 22:35 UTC2h 30m
2026-07-06 ASA340 - Jul 6, 14:55 UTCJul 6, 18:15 UTC3h 20m
2026-07-06 ASA98 - Jul 6, 10:05 UTCJul 6, 13:10 UTC3h 5m
2026-07-06 ASA1532 PDX → ANC Jul 6, 05:35 UTCJul 6, 08:50 UTC3h 15m
2026-07-06 ASA1532 PHX → PDX Jul 6, 02:30 UTCJul 6, 04:45 UTC2h 15m
2026-07-05 ASA731 PDX → PHX Jul 5, 22:05 UTCJul 6, 00:20 UTC2h 15m
2026-07-05 ASA731 PDX → PHX Jul 5, 22:05 UTCJul 6, 00:22 UTC2h 17m
2026-07-05 ASA1699 ONT → PDX Jul 5, 18:00 UTCJul 5, 19:50 UTC1h 50m
2026-07-05 ASA1449 - Jul 5, 14:45 UTCJul 5, 16:45 UTC2h 0m
2026-07-04 ASA1421 - Jul 4, 23:30 UTCJul 5, 03:30 UTC4h 0m
2026-07-04 ASA438 - Jul 4, 18:15 UTCJul 4, 22:05 UTC3h 50m
2026-07-04 ASA78 - Jul 4, 11:40 UTCJul 4, 16:10 UTC4h 30m
2026-07-04 ASA77 SFO → LAX Jul 4, 06:05 UTCJul 4, 10:10 UTC4h 5m
2026-07-04 ASA544 PDX → SFO Jul 4, 01:45 UTCJul 4, 04:45 UTC3h 0m
2026-07-03 ASA659 LAX → SFO Jul 3, 21:05 UTCJul 4, 00:15 UTC3h 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 N493AS page for operator, model, and routing details .

Mode-S A61B4E frequently asked

What is Mode-S code A61B4E?
A61B4E is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N493AS.
Where is Mode-S A61B4E registered?
Mode-S code A61B4E 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 A61B4E broadcasting right now?
Yes. Mode-S A61B4E is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A61B4E, octal 51415516, decimal 10,885,966.
What flights does A61B4E operate?
Mode-S A61B4E has broadcast 20 distinct callsigns, including ASA252, ASA253, ASA222, ASA205, ASA62.