Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

AC5B20

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8956Q · operated by SOUTHWEST AIRLINES CO

Hex
AC5B20
Octal
53055440
Decimal
11,295,520
Country
US
Tail
N8956Q
Type
B38M
No current signal · last broadcast Jul 26, 22:00 UTC
Flights observed
768
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:00 UTC

Last known position

Most recent position reported by Mode-S AC5B20.

Country allocation

The ICAO 24-bit address AC5B20 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
SWA586 - 6 2026-06-22
SWA3508 Southwest Airlines 5 2026-05-14
SWA347 Southwest Airlines 5 2026-06-09
SWA1521 - 5 2026-07-13
SWA864 - 4 2026-06-28
SWA3586 Southwest Airlines 4 2026-07-19
SWA3246 - 4 2026-06-15
SWA30 - 4 2026-06-19
SWA2364 Southwest Airlines 4 2026-05-12
SWA1433 Southwest Airlines 4 2026-04-13
SWA935 Southwest Airlines 3 2026-04-16
SWA882 Southwest Airlines 3 2026-05-10
SWA4632 - 3 2026-07-15
SWA4497 Southwest Airlines 3 2026-05-13
SWA4461 Southwest Airlines 3 2026-07-21
SWA4446 Southwest Airlines 3 2026-07-18
SWA4365 - 3 2026-06-30
SWA4213 Southwest Airlines 3 2026-05-10
SWA4092 Southwest Airlines 3 2026-07-26
SWA3996 Southwest Airlines 3 2026-04-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA2582 SNA → OAK Jul 26, 20:10 UTCJul 26, 22:00 UTC1h 50m
2026-07-26 SWA4092 SNA → OAK Jul 26, 16:55 UTCJul 26, 19:05 UTC2h 10m
2026-07-26 SWA4092 SNA → OAK Jul 26, 16:51 UTCJul 26, 18:59 UTC2h 8m
2026-07-26 SWA4092 SNA → OAK Jul 26, 14:55 UTCJul 26, 15:45 UTC50m
2026-07-26 SWA2543 MYR → BNA Jul 26, 11:10 UTCJul 26, 13:20 UTC2h 10m
2026-07-26 SWA3625 PDX → SMF Jul 26, 04:45 UTCJul 26, 05:20 UTC35m
2026-07-26 SWA3625 PDX → SMF Jul 26, 04:40 UTCJul 26, 05:20 UTC40m
2026-07-26 SWA3218 SAN → AUS Jul 26, 00:50 UTCJul 26, 03:40 UTC2h 50m
2026-07-26 SWA3218 SAN → AUS Jul 26, 00:48 UTCJul 26, 03:34 UTC2h 47m
2026-07-25 SWA4351 PBI → ISP Jul 25, 22:10 UTCJul 25, 23:35 UTC1h 25m
2026-07-25 SWA4351 PBI → ISP Jul 25, 22:06 UTCJul 25, 23:35 UTC1h 29m
2026-07-25 SWA1870 SDF → MDW Jul 25, 00:05 UTCJul 25, 02:50 UTC2h 45m
2026-07-24 SWA4022 DEN → IAD Jul 24, 20:55 UTCJul 24, 21:40 UTC45m
2026-07-24 SWA3560 MDW → TPA Jul 24, 16:40 UTCJul 24, 19:50 UTC3h 10m
2026-07-24 SWA3773 BWI → DAL Jul 24, 13:15 UTCJul 24, 15:10 UTC1h 55m
2026-07-24 SWA4121 LGA → STL Jul 24, 03:35 UTCJul 24, 06:00 UTC2h 25m
2026-07-24 SWA4121 LGA → STL Jul 24, 03:33 UTCJul 24, 07:26 UTC3h 53m
2026-07-24 SWA1604 PSP → OAK Jul 24, 00:35 UTCJul 24, 02:20 UTC1h 45m
2026-07-23 SWA3043 BWI → PVD Jul 23, 21:00 UTCJul 23, 23:00 UTC2h 0m
2026-07-23 SWA3366 BNA → SAT Jul 23, 15:40 UTCJul 23, 19:30 UTC3h 50m
2026-07-23 SWA3366 BNA → SAT Jul 23, 15:35 UTCJul 23, 19:27 UTC3h 52m
2026-07-23 SWA745 SJC → SEA Jul 23, 11:50 UTCJul 23, 13:55 UTC2h 5m
2026-07-22 SWA4930 MHT → TPA Jul 22, 22:10 UTCJul 23, 03:05 UTC4h 55m
2026-07-22 SWA964 OAK → RNO Jul 22, 19:45 UTCJul 22, 20:30 UTC45m
2026-07-22 SWA747 HNL → ITO Jul 22, 17:56 UTCJul 22, 18:39 UTC43m
2026-07-22 SWA747 HNL → ITO Jul 22, 18:00 UTCJul 22, 18:45 UTC45m
2026-07-22 SWA3917 SJU → TPA Jul 22, 14:45 UTCJul 22, 16:35 UTC1h 50m
2026-07-22 SWA4172 SLC → LAX Jul 22, 12:55 UTCJul 22, 13:35 UTC40m
2026-07-22 SWA3744 IND → RSW Jul 22, 02:10 UTCJul 22, 04:55 UTC2h 45m
2026-07-22 SWA3744 IND → RSW Jul 22, 00:10 UTCJul 22, 00:50 UTC40m
2026-07-21 SWA4461 LAX → SFO Jul 21, 22:10 UTCJul 21, 23:00 UTC50m
2026-07-21 SWA4461 LAX → SFO Jul 21, 22:04 UTCJul 21, 22:57 UTC53m
2026-07-21 SWA4461 LAX → SFO Jul 21, 19:05 UTCJul 21, 20:45 UTC1h 40m
2026-07-21 SWA3261 DAL → ORD Jul 21, 16:40 UTCJul 21, 18:00 UTC1h 20m
2026-07-21 SWA3261 DAL → ORD Jul 21, 14:20 UTCJul 21, 15:15 UTC55m
2026-07-21 SWA1748 OAK → DAL Jul 21, 01:30 UTCJul 21, 03:25 UTC1h 55m
2026-07-20 SWA2843 ISP → TPA Jul 20, 22:00 UTCJul 21, 00:10 UTC2h 9m
2026-07-20 SWA2843 ISP → TPA Jul 20, 21:59 UTCJul 21, 00:06 UTC2h 7m
2026-07-20 SWA2234 SJC → AUS Jul 20, 19:15 UTCJul 20, 20:50 UTC1h 35m
2026-07-20 SWA2234 SJC → AUS Jul 20, 19:13 UTCJul 20, 20:45 UTC1h 32m
2026-07-20 SWA2234 SJC → AUS Jul 20, 17:25 UTCJul 20, 18:10 UTC45m
2026-07-20 SWA543 SAN → SJC Jul 20, 14:30 UTCJul 20, 15:55 UTC1h 25m
2026-07-20 SWA1408 DAL → SLC Jul 20, 11:10 UTCJul 20, 13:20 UTC2h 10m
2026-07-20 SWA3492 OAK → LGB Jul 20, 02:05 UTCJul 20, 04:40 UTC2h 35m
2026-07-19 SWA1386 AUS → SJC Jul 19, 23:23 UTCJul 20, 00:37 UTC1h 14m
2026-07-19 SWA1386 AUS → SJC Jul 19, 23:25 UTCJul 20, 00:35 UTC1h 10m
2026-07-19 SWA3586 BWI → PWM Jul 19, 20:40 UTCJul 19, 21:55 UTC1h 15m
2026-07-19 SWA3586 BWI → PWM Jul 19, 17:10 UTCJul 19, 19:30 UTC2h 20m
2026-07-19 SWA3586 BWI → PWM Jul 19, 12:50 UTCJul 19, 14:20 UTC1h 30m
2026-07-19 SWA3586 BWI → PWM Jul 19, 12:48 UTCJul 19, 14:16 UTC1h 28m

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 N8956Q page for operator, model, and routing details .

Mode-S AC5B20 frequently asked

What is Mode-S code AC5B20?
AC5B20 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8956Q.
Where is Mode-S AC5B20 registered?
Mode-S code AC5B20 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 AC5B20 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC5B20, octal 53055440, decimal 11,295,520.
What flights does AC5B20 operate?
Mode-S AC5B20 has broadcast 20 distinct callsigns, including SWA586, SWA3508, SWA347, SWA1521, SWA864.