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sensors Mode-S transponder

AC4F4C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8921Q · BOEING 737 MAX 8 · operated by SOUTHWEST AIRLINES CO

Hex
AC4F4C
Octal
53047514
Decimal
11,292,492
Country
US
Tail
N8921Q
Type
B38M
Broadcasting now · callsign SWA3139 · 41,000 ft
Flights observed
724
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 23:00 UTC

Current position

AC4F4C is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AC4F4C 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
SWA4084 Southwest Airlines 6 2026-06-27
SWA3780 Southwest Airlines 5 2026-06-03
SWA1644 Southwest Airlines 5 2026-05-13
SWA4501 Southwest Airlines 4 2026-05-23
SWA426 - 4 2026-07-06
SWA4101 Southwest Airlines 4 2026-05-22
SWA3886 - 4 2026-06-28
SWA314 - 4 2026-06-24
SWA2766 - 4 2026-04-13
SWA164 - 4 2026-06-27
SWA155 - 4 2026-07-20
SWA1409 Southwest Airlines 4 2026-05-23
SWA1322 - 4 2026-06-23
SWA1158 Southwest Airlines 4 2026-05-06
SWA974 - 3 2026-07-06
SWA737 Southwest Airlines 3 2026-06-08
SWA555 Southwest Airlines 3 2026-06-01
SWA4922 Southwest Airlines 3 2026-07-26
SWA4457 Southwest Airlines 3 2026-06-27
SWA4322 Southwest Airlines 3 2026-06-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA766 MDW → LGA Jul 26, 22:25 UTCJul 26, 23:00 UTC35m
2026-07-26 SWA4922 LAX → OAK Jul 26, 20:00 UTCJul 26, 21:00 UTC1h 0m
2026-07-26 SWA988 STL → ATL Jul 26, 16:50 UTCJul 26, 18:35 UTC1h 45m
2026-07-26 SWA2541 ATL → BNA Jul 26, 13:25 UTCJul 26, 15:35 UTC2h 10m
2026-07-26 SWA966 BWI → BOS Jul 26, 10:10 UTCJul 26, 12:10 UTC2h 0m
2026-07-26 SWA966 BWI → BOS Jul 26, 10:06 UTCJul 26, 12:07 UTC2h 1m
2026-07-26 SWA353 SLC → DEN Jul 26, 01:15 UTCJul 26, 03:15 UTC2h 0m
2026-07-26 SWA353 SLC → DEN Jul 26, 01:14 UTCJul 26, 03:15 UTC2h 1m
2026-07-25 SWA502 BOS → BWI Jul 25, 19:45 UTCJul 25, 22:33 UTC2h 49m
2026-07-25 SWA502 BOS → BWI Jul 25, 19:45 UTCJul 25, 22:35 UTC2h 50m
2026-07-25 SWA181 OAK → PSP Jul 25, 15:30 UTCJul 25, 18:20 UTC2h 50m
2026-07-25 SWA3721 BUR → LAS Jul 25, 10:25 UTCJul 25, 12:55 UTC2h 30m
2026-07-25 SWA3721 BUR → LAS Jul 25, 10:19 UTCJul 25, 12:47 UTC2h 28m
2026-07-25 SWA2080 ABQ → DEN Jul 25, 04:20 UTCJul 25, 04:35 UTC15m
2026-07-25 SWA2080 ABQ → DEN Jul 25, 00:35 UTCJul 25, 02:50 UTC2h 15m
2026-07-24 SWA4654 LAX → LAS Jul 24, 21:00 UTCJul 24, 22:50 UTC1h 50m
2026-07-24 SWA1339 HOU → SJC Jul 24, 16:20 UTCJul 24, 19:30 UTC3h 10m
2026-07-24 SWA3738 LAX → OAK Jul 24, 13:40 UTCJul 24, 14:40 UTC1h 0m
2026-07-24 SWA4792 DEN → LAS Jul 24, 04:40 UTCJul 24, 05:55 UTC1h 15m
2026-07-24 SWA4173 SEA → DEN Jul 24, 02:50 UTCJul 24, 03:40 UTC50m
2026-07-24 SWA4292 RSW → CMH Jul 24, 00:30 UTCJul 24, 01:40 UTC1h 10m
2026-07-23 SWA4828 DEN → MDW Jul 23, 20:05 UTCJul 23, 23:10 UTC3h 5m
2026-07-23 SWA1586 DEN → MCI Jul 23, 17:34 UTCJul 23, 18:42 UTC1h 8m
2026-07-23 SWA1586 - Jul 23, 17:35 UTCJul 23, 18:45 UTC1h 10m
2026-07-23 SWA4011 SJC → SEA Jul 23, 14:25 UTCJul 23, 16:15 UTC1h 50m
2026-07-23 SWA309 MHT → MDW Jul 23, 04:20 UTCJul 23, 05:10 UTC50m
2026-07-23 SWA3696 LAX → SJC Jul 23, 01:55 UTCJul 23, 03:25 UTC1h 30m
2026-07-22 SWA2350 LAS → FAT Jul 22, 23:50 UTCJul 23, 00:55 UTC1h 5m
2026-07-22 SWA2350 LAS → FAT Jul 22, 20:25 UTCJul 22, 22:25 UTC2h 0m
2026-07-22 SWA3051 DEN → SEA Jul 22, 16:40 UTCJul 22, 18:50 UTC2h 10m
2026-07-22 SWA4803 MDW → LAX Jul 22, 13:35 UTCJul 22, 15:10 UTC1h 35m
2026-07-22 SWA3830 SAN → OAK Jul 22, 03:10 UTCJul 22, 04:40 UTC1h 30m
2026-07-22 SWA3570 - Jul 22, 00:50 UTCJul 22, 02:05 UTC1h 15m
2026-07-21 SWA3079 - Jul 21, 20:55 UTCJul 21, 23:15 UTC2h 20m
2026-07-21 SWA1941 BOS → BWI Jul 21, 16:00 UTCJul 21, 19:30 UTC3h 30m
2026-07-21 SWA1941 BOS → BWI Jul 21, 13:20 UTCJul 21, 15:05 UTC1h 45m
2026-07-21 SWA518 PHX → OAK Jul 21, 10:20 UTCJul 21, 12:05 UTC1h 45m
2026-07-21 SWA518 PHX → OAK Jul 21, 10:15 UTCJul 21, 12:00 UTC1h 45m
2026-07-21 SWA2248 - Jul 21, 03:10 UTCJul 21, 06:20 UTC3h 10m
2026-07-21 SWA2248 LAS → IND Jul 21, 03:07 UTCJul 21, 06:20 UTC3h 13m
2026-07-20 SWA4240 - Jul 20, 23:05 UTCJul 21, 01:30 UTC2h 24m
2026-07-20 SWA4625 BUR → SJC Jul 20, 20:40 UTCJul 20, 21:55 UTC1h 15m
2026-07-20 SWA155 - Jul 20, 17:20 UTCJul 20, 19:20 UTC2h 0m
2026-07-20 SWA155 - Jul 20, 15:20 UTCJul 20, 16:15 UTC55m
2026-07-20 SWA1280 DAL → BWI Jul 20, 11:20 UTCJul 20, 13:55 UTC2h 35m
2026-07-20 SWA3254 PHX → DAL Jul 20, 02:25 UTCJul 20, 04:30 UTC2h 5m
2026-07-20 SWA701 DAL → AMA Jul 20, 00:25 UTCJul 20, 01:15 UTC50m
2026-07-20 SWA701 DAL → AMA Jul 20, 00:25 UTCJul 20, 01:12 UTC47m
2026-07-19 SWA8802 - Jul 19, 18:25 UTCJul 19, 23:20 UTC4h 55m
2026-07-18 SWA2415 - Jul 18, 15:35 UTCJul 18, 18:15 UTC2h 40m

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 N8921Q page for operator, model, and routing details .

Mode-S AC4F4C frequently asked

What is Mode-S code AC4F4C?
AC4F4C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8921Q.
Where is Mode-S AC4F4C registered?
Mode-S code AC4F4C 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 AC4F4C broadcasting right now?
Yes. Mode-S AC4F4C is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC4F4C, octal 53047514, decimal 11,292,492.
What flights does AC4F4C operate?
Mode-S AC4F4C has broadcast 20 distinct callsigns, including SWA4084, SWA3780, SWA1644, SWA4501, SWA426.