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sensors Mode-S transponder

AC27CF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8821S · operated by SOUTHWEST AIRLINES CO

Hex
AC27CF
Octal
53023717
Decimal
11,282,383
Country
US
Tail
N8821S
Type
B38M
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
750
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S AC27CF.

Country allocation

The ICAO 24-bit address AC27CF 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
SWA954 Southwest Airlines 4 2026-04-29
SWA614 - 4 2026-06-22
SWA3417 Southwest Airlines 4 2026-05-30
SWA2593 Southwest Airlines 4 2026-06-06
SWA2038 Southwest Airlines 4 2026-06-12
SWA2012 Southwest Airlines 4 2026-07-25
SWA1271 - 4 2026-07-17
SWA958 - 3 2026-07-03
SWA864 - 3 2026-07-05
SWA699 Southwest Airlines 3 2026-04-15
SWA4623 Southwest Airlines 3 2026-06-17
SWA4514 - 3 2026-07-10
SWA4504 - 3 2026-04-13
SWA4445 Southwest Airlines 3 2026-04-15
SWA4353 - 3 2026-07-08
SWA4323 Southwest Airlines 3 2026-07-03
SWA3753 Southwest Airlines 3 2026-06-05
SWA3729 - 3 2026-04-13
SWA3625 - 3 2026-07-13
SWA3457 Southwest Airlines 3 2026-05-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA809 - Jul 26, 13:25 UTCJul 26, 21:45 UTC8h 20m
2026-07-26 SWA2385 LAS → AUS Jul 26, 05:05 UTCJul 26, 09:35 UTC4h 31m
2026-07-26 SWA3948 LGB → SJC Jul 26, 01:25 UTCJul 26, 02:55 UTC1h 30m
2026-07-25 SWA2012 PDX → OAK Jul 25, 23:10 UTCJul 26, 00:00 UTC50m
2026-07-25 SWA2012 PDX → OAK Jul 25, 23:05 UTCJul 25, 23:57 UTC52m
2026-07-25 SWA2012 PDX → OAK Jul 25, 20:30 UTCJul 25, 22:10 UTC1h 40m
2026-07-25 SWA2012 PDX → OAK Jul 25, 18:25 UTCJul 25, 19:25 UTC1h 0m
2026-07-25 SWA2483 HOU → DEN Jul 25, 14:15 UTCJul 25, 17:10 UTC2h 55m
2026-07-25 SWA4352 IND → AUS Jul 25, 02:35 UTCJul 25, 03:25 UTC50m
2026-07-25 SWA4352 IND → AUS Jul 25, 02:30 UTCJul 25, 03:23 UTC53m
2026-07-25 SWA3159 LAS → ORD Jul 25, 00:35 UTCJul 25, 01:25 UTC50m
2026-07-25 SWA3159 LAS → ORD Jul 25, 00:30 UTCJul 25, 01:27 UTC57m
2026-07-24 SWA381 DAL → RSW Jul 24, 22:35 UTCJul 24, 23:35 UTC1h 0m
2026-07-24 SWA381 DAL → RSW Jul 24, 22:35 UTCJul 24, 23:32 UTC57m
2026-07-24 SWA441 HOU → DEN Jul 24, 19:50 UTCJul 24, 21:35 UTC1h 45m
2026-07-24 SWA2306 OMA → MDW Jul 24, 16:45 UTCJul 24, 18:40 UTC1h 55m
2026-07-24 SWA973 LAS → AUS Jul 24, 10:40 UTCJul 24, 15:15 UTC4h 35m
2026-07-23 SWA2963 BWI → TPA Jul 23, 23:30 UTCJul 24, 01:15 UTC1h 45m
2026-07-23 SWA1638 LGA → BNA Jul 23, 20:55 UTCJul 23, 22:25 UTC1h 30m
2026-07-23 SWA2391 BUR → SLC Jul 23, 17:55 UTCJul 23, 19:40 UTC1h 45m
2026-07-23 SWA2391 BUR → SLC Jul 23, 17:50 UTCJul 23, 19:40 UTC1h 50m
2026-07-23 SWA1568 PHX → DEN Jul 23, 14:35 UTCJul 23, 16:25 UTC1h 50m
2026-07-23 SWA2989 SJC → SAN Jul 23, 10:20 UTCJul 23, 12:25 UTC2h 5m
2026-07-23 SWA1614 BOS → BWI Jul 23, 05:40 UTCJul 23, 07:35 UTC1h 55m
2026-07-23 SWA1674 OAK → PSP Jul 23, 02:00 UTCJul 23, 04:20 UTC2h 20m
2026-07-23 SWA1674 OAK → PSP Jul 23, 01:55 UTCJul 23, 04:16 UTC2h 21m
2026-07-22 SWA2998 - Jul 22, 19:50 UTCJul 22, 20:35 UTC45m
2026-07-22 SWA2280 - Jul 22, 15:50 UTCJul 22, 18:55 UTC3h 5m
2026-07-22 SWA2280 SJC → LAS Jul 22, 13:20 UTCJul 22, 14:20 UTC1h 0m
2026-07-22 SWA4936 LAX → OAK Jul 22, 03:45 UTCJul 22, 04:35 UTC50m
2026-07-22 SWA4936 LAX → OAK Jul 22, 03:40 UTCJul 22, 04:30 UTC50m
2026-07-22 SWA1748 OAK → DAL Jul 22, 00:55 UTCJul 22, 02:50 UTC1h 55m
2026-07-21 SWA1139 AUS → FLL Jul 21, 17:50 UTCJul 21, 23:20 UTC5h 30m
2026-07-21 SWA1139 AUS → FLL Jul 21, 14:45 UTCJul 21, 16:30 UTC1h 45m
2026-07-21 SWA4695 PDX → SJC Jul 21, 12:20 UTCJul 21, 13:25 UTC1h 5m
2026-07-21 SWA4695 PDX → SJC Jul 21, 12:15 UTCJul 21, 13:15 UTC1h 0m
2026-07-21 SWA4194 - Jul 21, 00:25 UTCJul 21, 01:45 UTC1h 20m
2026-07-21 SWA4194 MDW → CLT Jul 21, 00:20 UTCJul 21, 01:39 UTC1h 19m
2026-07-20 SWA2273 LAS → MDW Jul 20, 20:20 UTCJul 20, 23:25 UTC3h 5m
2026-07-20 SWA1561 BOS → BWI Jul 20, 17:45 UTCJul 20, 19:10 UTC1h 25m
2026-07-20 SWA2118 LAX → SFO Jul 20, 13:50 UTCJul 20, 16:00 UTC2h 10m
2026-07-20 SWA2642 - Jul 20, 10:50 UTCJul 20, 12:50 UTC2h 0m
2026-07-20 SWA3728 DCA → DAL Jul 20, 03:10 UTCJul 20, 03:50 UTC40m
2026-07-20 SWA3728 DCA → DAL Jul 20, 01:20 UTCJul 20, 01:35 UTC15m
2026-07-19 SWA2788 - Jul 19, 21:35 UTCJul 20, 00:05 UTC2h 30m
2026-07-19 SWA2788 MCO → SJU Jul 19, 21:35 UTCJul 20, 00:02 UTC2h 27m
2026-07-19 SWA3120 OKC → MCO Jul 19, 18:00 UTCJul 19, 20:25 UTC2h 25m
2026-07-19 SWA3309 PHX → OKC Jul 19, 15:00 UTCJul 19, 16:50 UTC1h 50m
2026-07-19 SWA3751 DAL → COS Jul 19, 11:55 UTCJul 19, 13:10 UTC1h 15m
2026-07-19 SWA1969 BNA → DCA Jul 19, 03:45 UTCJul 19, 05:15 UTC1h 30m

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 N8821S page for operator, model, and routing details .

Mode-S AC27CF frequently asked

What is Mode-S code AC27CF?
AC27CF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8821S.
Where is Mode-S AC27CF registered?
Mode-S code AC27CF 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 AC27CF broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC27CF, octal 53023717, decimal 11,282,383.
What flights does AC27CF operate?
Mode-S AC27CF has broadcast 20 distinct callsigns, including SWA954, SWA614, SWA3417, SWA2593, SWA2038.