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sensors Mode-S transponder

AD493B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N955WN · BOEING 737-700 · operated by SOUTHWEST AIRLINES CO

Hex
AD493B
Octal
53244473
Decimal
11,356,475
Country
US
Tail
N955WN
Type
B737
Transponder active on ground
Flights observed
700
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S AD493B.

Country allocation

The ICAO 24-bit address AD493B 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
SWA3335 Southwest Airlines 9 2026-06-11
SWA3281 Southwest Airlines 8 2026-05-27
SWA3243 Southwest Airlines 7 2026-06-02
SWA278 - 7 2026-06-23
SWA1372 Southwest Airlines 7 2026-05-20
SWA1192 Southwest Airlines 7 2026-05-20
SWA1502 - 6 2026-07-11
SWA1222 - 6 2026-07-03
SWA2451 Southwest Airlines 5 2026-05-21
SWA1382 - 5 2026-07-02
SWA860 - 4 2026-07-03
SWA647 Southwest Airlines 4 2026-06-09
SWA4722 Southwest Airlines 4 2026-05-17
SWA4055 Southwest Airlines 4 2026-05-12
SWA3589 Southwest Airlines 4 2026-05-30
SWA3156 - 4 2026-07-01
SWA2784 Southwest Airlines 4 2026-04-28
SWA2505 - 4 2026-07-09
SWA2377 Southwest Airlines 4 2026-06-04
SWA2267 - 4 2026-06-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SWA2878 - Jul 14, 00:20 UTCJul 14, 00:45 UTC25m
2026-07-13 SWA1276 - Jul 13, 21:05 UTCJul 13, 22:35 UTC1h 30m
2026-07-13 SWA1276 LAS → ICT Jul 13, 18:10 UTCJul 13, 20:15 UTC2h 5m
2026-07-13 SWA1276 - Jul 13, 15:50 UTCJul 13, 16:45 UTC55m
2026-07-13 SWA2319 - Jul 13, 13:45 UTCJul 13, 14:30 UTC45m
2026-07-13 SWA1860 - Jul 13, 02:25 UTCJul 13, 03:40 UTC1h 15m
2026-07-12 SWA4779 - Jul 12, 21:55 UTCJul 13, 01:01 UTC3h 5m
2026-07-12 SWA351 - Jul 12, 18:20 UTCJul 12, 20:30 UTC2h 10m
2026-07-12 SWA351 - Jul 12, 16:35 UTCJul 12, 17:20 UTC45m
2026-07-12 SWA1441 DEN → BNA Jul 12, 13:30 UTCJul 12, 15:35 UTC2h 5m
2026-07-12 SWA1441 DEN → BNA Jul 12, 13:27 UTCJul 12, 15:32 UTC2h 5m
2026-07-12 SWA1676 - Jul 12, 11:01 UTCJul 12, 12:20 UTC1h 20m
2026-07-12 SWA2912 - Jul 12, 05:45 UTCJul 12, 06:50 UTC1h 5m
2026-07-12 SWA2912 MDW → DAL Jul 12, 01:45 UTCJul 12, 04:05 UTC2h 20m
2026-07-11 SWA1058 - Jul 11, 23:10 UTCJul 12, 00:20 UTC1h 10m
2026-07-11 SWA4728 - Jul 11, 20:40 UTCJul 11, 22:05 UTC1h 25m
2026-07-11 SWA138 - Jul 11, 18:00 UTCJul 11, 18:45 UTC45m
2026-07-11 SWA138 MYR → BNA Jul 11, 17:52 UTCJul 11, 19:11 UTC1h 19m
2026-07-11 SWA1502 - Jul 11, 14:45 UTCJul 11, 16:50 UTC2h 5m
2026-07-11 SWA1502 DAL → MYR Jul 11, 14:45 UTCJul 11, 16:54 UTC2h 9m
2026-07-11 SWA1502 - Jul 11, 12:55 UTCJul 11, 13:40 UTC45m
2026-07-11 SWA2073 DEN → SAT Jul 11, 04:06 UTCJul 11, 05:49 UTC1h 43m
2026-07-11 SWA2073 - Jul 11, 04:10 UTCJul 11, 05:50 UTC1h 40m
2026-07-11 SWA3570 - Jul 11, 01:25 UTCJul 11, 02:55 UTC1h 30m
2026-07-11 SWA3570 MCI → DEN Jul 11, 01:23 UTCJul 11, 02:48 UTC1h 26m
2026-07-10 SWA4970 LGA → MCI Jul 10, 20:49 UTCJul 10, 23:37 UTC2h 48m
2026-07-10 SWA4970 - Jul 10, 20:50 UTCJul 10, 23:40 UTC2h 50m
2026-07-10 SWA2563 SRQ → ATL Jul 10, 16:30 UTCJul 10, 18:45 UTC2h 15m
2026-07-10 SWA2563 SRQ → ATL Jul 10, 13:10 UTCJul 10, 15:15 UTC2h 5m
2026-07-10 SWA1672 - Jul 10, 06:00 UTCJul 10, 07:00 UTC1h 0m
2026-07-10 SWA1672 LAX → PHX Jul 10, 05:57 UTCJul 10, 06:56 UTC1h 0m
2026-07-10 SWA140 - Jul 10, 03:35 UTCJul 10, 05:05 UTC1h 30m
2026-07-10 SWA2755 - Jul 10, 01:25 UTCJul 10, 02:30 UTC1h 5m
2026-07-10 SWA2755 LAS → ABQ Jul 10, 01:23 UTCJul 10, 02:26 UTC1h 3m
2026-07-09 SWA2755 - Jul 9, 23:35 UTCJul 10, 00:30 UTC55m
2026-07-09 SWA2505 - Jul 9, 21:30 UTCJul 9, 22:30 UTC1h 0m
2026-07-09 SWA2505 PHX → LGB Jul 9, 19:35 UTCJul 9, 20:30 UTC55m
2026-07-09 SWA2310 LAS → PHX Jul 9, 17:05 UTCJul 9, 17:50 UTC45m
2026-07-09 SWA2310 - Jul 9, 15:05 UTCJul 9, 16:00 UTC55m
2026-07-09 SWA2310 - Jul 9, 12:50 UTCJul 9, 13:45 UTC55m
2026-07-09 SWA3358 RNO → OAK Jul 9, 06:10 UTCJul 9, 06:30 UTC20m
2026-07-09 SWA3358 RNO → OAK Jul 9, 06:06 UTCJul 9, 06:29 UTC23m
2026-07-09 SWA820 BUR → PHX Jul 9, 02:20 UTCJul 9, 03:15 UTC55m
2026-07-09 SWA3663 SJC → BUR Jul 9, 00:50 UTCJul 9, 01:35 UTC45m
2026-07-09 SWA3663 SJC → BUR Jul 9, 00:50 UTCJul 9, 01:32 UTC42m
2026-07-08 SWA4883 - Jul 8, 23:30 UTCJul 9, 00:15 UTC45m
2026-07-08 SWA4883 - Jul 8, 22:15 UTCJul 9, 00:15 UTC2h 0m
2026-07-08 SWA4931 SJC → BUR Jul 8, 22:13 UTCJul 8, 22:58 UTC45m
2026-07-08 SWA1181 - Jul 8, 20:15 UTCJul 8, 21:15 UTC1h 0m
2026-07-08 SWA1181 - Jul 8, 18:15 UTCJul 8, 19:00 UTC45m

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 N955WN page for operator, model, and routing details .

Mode-S AD493B frequently asked

What is Mode-S code AD493B?
AD493B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N955WN.
Where is Mode-S AD493B registered?
Mode-S code AD493B 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 AD493B broadcasting right now?
Mode-S AD493B is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AD493B, octal 53244473, decimal 11,356,475.
What flights does AD493B operate?
Mode-S AD493B has broadcast 20 distinct callsigns, including SWA3335, SWA3281, SWA3243, SWA278, SWA1372.