Apparatus

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sensors Mode-S transponder

AC57AF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8948Q · operated by SOUTHWEST AIRLINES CO

Hex
AC57AF
Octal
53053657
Decimal
11,294,639
Country
US
Tail
N8948Q
Type
B38M
Broadcasting now · callsign SWA1218 · 18,825 ft
Flights observed
730
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:35 UTC

Current position

AC57AF is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AC57AF 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
SWA426 Southwest Airlines 6 2026-05-19
SWA444 Southwest Airlines 5 2026-04-18
SWA4055 Southwest Airlines 5 2026-05-21
SWA3682 Southwest Airlines 5 2026-07-21
SWA1763 Southwest Airlines 5 2026-05-23
SWA938 Southwest Airlines 4 2026-07-26
SWA873 Southwest Airlines 4 2026-04-15
SWA591 - 4 2026-07-18
SWA4443 Southwest Airlines 4 2026-06-11
SWA3433 Southwest Airlines 4 2026-04-17
SWA3337 Southwest Airlines 4 2026-05-22
SWA281 Southwest Airlines 4 2026-07-22
SWA2782 Southwest Airlines 4 2026-06-08
SWA2013 - 4 2026-04-14
SWA1424 Southwest Airlines 4 2026-05-05
SWA139 - 4 2026-04-13
SWA898 Southwest Airlines 3 2026-05-12
SWA719 Southwest Airlines 3 2026-04-23
SWA590 - 3 2026-07-01
SWA542 Southwest Airlines 3 2026-05-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA938 MDW → BOS Jul 26, 20:20 UTCJul 26, 21:35 UTC1h 15m
2026-07-26 SWA3700 ORF → BWI Jul 26, 17:20 UTCJul 26, 19:05 UTC1h 45m
2026-07-26 SWA2211 SAN → SJC Jul 26, 12:40 UTCJul 26, 16:15 UTC3h 35m
2026-07-26 SWA4841 CMH → PHX Jul 26, 05:59 UTCJul 26, 07:01 UTC1h 2m
2026-07-26 SWA4841 CMH → PHX Jul 26, 06:00 UTCJul 26, 07:00 UTC1h 1m
2026-07-26 SWA1978 MSP → STL Jul 26, 01:00 UTCJul 26, 04:30 UTC3h 30m
2026-07-26 SWA1978 MSP → STL Jul 26, 01:00 UTCJul 26, 04:26 UTC3h 26m
2026-07-25 SWA4155 SJC → DEN Jul 25, 21:55 UTCJul 25, 23:55 UTC2h 0m
2026-07-25 SWA4030 OAK → BUR Jul 25, 20:05 UTCJul 25, 20:35 UTC30m
2026-07-25 SWA4030 OAK → BUR Jul 25, 20:01 UTCJul 25, 20:36 UTC35m
2026-07-25 SWA956 LAX → SJC Jul 25, 15:30 UTCJul 25, 18:05 UTC2h 35m
2026-07-25 SWA956 LAX → SJC Jul 25, 12:50 UTCJul 25, 14:10 UTC1h 20m
2026-07-25 SWA1002 BUR → SJC Jul 25, 10:55 UTCJul 25, 11:55 UTC1h 0m
2026-07-24 SWA4669 PHX → OAK Jul 24, 23:50 UTCJul 25, 02:30 UTC2h 40m
2026-07-24 SWA4669 PHX → OAK Jul 24, 23:47 UTCJul 25, 02:29 UTC2h 42m
2026-07-24 SWA1124 BOS → MDW Jul 24, 20:55 UTCJul 24, 23:00 UTC2h 5m
2026-07-24 SWA1032 ATL → DAL Jul 24, 17:40 UTCJul 24, 19:25 UTC1h 45m
2026-07-24 SWA1032 ATL → DAL Jul 24, 17:38 UTCJul 24, 19:25 UTC1h 47m
2026-07-24 SWA4196 MCO → DAL Jul 24, 15:10 UTCJul 24, 16:30 UTC1h 20m
2026-07-24 SWA4196 MCO → DAL Jul 24, 15:09 UTCJul 24, 16:24 UTC1h 15m
2026-07-24 SWA1012 MKE → CUN Jul 24, 12:10 UTCJul 24, 14:10 UTC2h 0m
2026-07-24 SWA1501 OAK → PHX Jul 24, 07:10 UTCJul 24, 09:55 UTC2h 45m
2026-07-24 SWA4851 MDW → DAL Jul 24, 03:55 UTCJul 24, 04:50 UTC55m
2026-07-23 SWA924 PDX → LAS Jul 23, 22:55 UTCJul 24, 03:05 UTC4h 10m
2026-07-23 SWA924 PDX → LAS Jul 23, 22:51 UTCJul 24, 02:58 UTC4h 8m
2026-07-23 SWA432 MCI → DAL Jul 23, 20:00 UTCJul 23, 21:30 UTC1h 30m
2026-07-23 SWA432 MCI → DAL Jul 23, 17:50 UTCJul 23, 18:50 UTC1h 0m
2026-07-23 SWA2907 DEN → PHL Jul 23, 14:50 UTCJul 23, 16:50 UTC2h 0m
2026-07-23 SWA4180 PDX → SJC Jul 23, 11:15 UTCJul 23, 13:05 UTC1h 50m
2026-07-23 SWA2399 LAS → BUR Jul 23, 02:50 UTCJul 23, 04:25 UTC1h 35m
2026-07-22 SWA1403 MDW → RDU Jul 22, 23:10 UTCJul 23, 01:50 UTC2h 40m
2026-07-22 SWA281 SNA → OAK Jul 22, 18:05 UTCJul 22, 20:50 UTC2h 45m
2026-07-22 SWA281 SNA → OAK Jul 22, 13:55 UTCJul 22, 16:28 UTC2h 33m
2026-07-22 SWA281 SNA → OAK Jul 22, 14:00 UTCJul 22, 15:45 UTC1h 45m
2026-07-22 SWA2601 PDX → SJC Jul 22, 04:00 UTCJul 22, 05:10 UTC1h 10m
2026-07-22 SWA4842 FLL → IND Jul 22, 01:05 UTCJul 22, 02:05 UTC1h 0m
2026-07-22 SWA4842 FLL → IND Jul 22, 01:05 UTCJul 22, 02:10 UTC1h 5m
2026-07-21 SWA4486 - Jul 21, 21:05 UTCJul 21, 23:45 UTC2h 40m
2026-07-21 SWA709 SJC → LAX Jul 21, 17:50 UTCJul 21, 19:45 UTC1h 55m
2026-07-21 SWA3682 MSY → MIA Jul 21, 13:20 UTCJul 21, 16:20 UTC3h 0m
2026-07-21 SWA2681 MDW → LGA Jul 21, 04:20 UTCJul 21, 04:45 UTC25m
2026-07-21 SWA2681 MDW → LGA Jul 21, 00:09 UTCJul 21, 04:01 UTC3h 52m
2026-07-21 SWA2681 MDW → LGA Jul 21, 00:10 UTCJul 21, 04:45 UTC4h 35m
2026-07-20 SWA273 MBJ → MCO Jul 20, 20:20 UTCJul 20, 21:20 UTC1h 0m
2026-07-20 SWA272 MCO → MBJ Jul 20, 16:40 UTCJul 20, 17:25 UTC45m
2026-07-20 SWA272 MCO → MBJ Jul 20, 16:36 UTCJul 20, 18:11 UTC1h 35m
2026-07-20 SWA3722 - Jul 20, 12:10 UTCJul 20, 13:00 UTC50m
2026-07-20 SWA3722 - Jul 20, 10:25 UTCJul 20, 10:40 UTC15m
2026-07-20 SWA1104 BNA → FLL Jul 20, 05:50 UTCJul 20, 06:10 UTC20m
2026-07-20 SWA1104 BNA → FLL Jul 20, 02:20 UTCJul 20, 04:20 UTC2h 0m

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 N8948Q page for operator, model, and routing details .

Mode-S AC57AF frequently asked

What is Mode-S code AC57AF?
AC57AF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8948Q.
Where is Mode-S AC57AF registered?
Mode-S code AC57AF 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 AC57AF broadcasting right now?
Yes. Mode-S AC57AF is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC57AF, octal 53053657, decimal 11,294,639.
What flights does AC57AF operate?
Mode-S AC57AF has broadcast 20 distinct callsigns, including SWA426, SWA444, SWA4055, SWA3682, SWA1763.