Apparatus

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sensors Mode-S transponder

ABB8C4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8541W · BOEING 737-800 · operated by SOUTHWEST AIRLINES CO

Hex
ABB8C4
Octal
52734304
Decimal
11,253,956
Country
US
Tail
N8541W
Type
B738
No current signal · last broadcast Jul 26, 21:40 UTC
Flights observed
656
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:40 UTC

Last known position

Most recent position reported by Mode-S ABB8C4.

Country allocation

The ICAO 24-bit address ABB8C4 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
SWA1355 - 8 2026-07-10
SWA436 - 7 2026-07-17
SWA2518 - 6 2026-07-17
SWA4015 Southwest Airlines 5 2026-07-26
SWA4302 - 4 2026-07-17
SWA3591 Southwest Airlines 4 2026-05-30
SWA2913 - 4 2026-04-13
SWA193 - 4 2026-07-14
SWA1670 Southwest Airlines 4 2026-05-27
SWA1546 - 4 2026-07-05
SWA1193 - 4 2026-07-17
SWA918 - 3 2026-07-12
SWA768 - 3 2026-06-26
SWA582 - 3 2026-06-19
SWA553 Southwest Airlines 3 2026-06-18
SWA451 Southwest Airlines 3 2026-04-16
SWA3847 Southwest Airlines 3 2026-04-15
SWA3718 - 3 2026-06-24
SWA3376 - 3 2026-07-01
SWA300 Southwest Airlines 3 2026-04-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA4918 ELP → LAS Jul 26, 20:10 UTCJul 26, 21:40 UTC1h 30m
2026-07-26 SWA2558 DEN → OAK Jul 26, 16:50 UTCJul 26, 19:20 UTC2h 30m
2026-07-26 SWA1971 SEA → OAK Jul 26, 13:10 UTCJul 26, 15:00 UTC1h 50m
2026-07-26 SWA1628 HOU → LGB Jul 26, 11:05 UTCJul 26, 11:45 UTC40m
2026-07-26 SWA4015 MCI → SRQ Jul 26, 01:00 UTCJul 26, 03:05 UTC2h 5m
2026-07-25 SWA1765 BWI → MHT Jul 25, 21:40 UTCJul 25, 23:45 UTC2h 5m
2026-07-25 SWA1765 BWI → MHT Jul 25, 21:36 UTCJul 25, 23:35 UTC1h 59m
2026-07-25 SWA1765 BWI → MHT Jul 25, 19:30 UTCJul 25, 20:35 UTC1h 5m
2026-07-25 SWA1332 BUR → OAK Jul 25, 16:05 UTCJul 25, 18:20 UTC2h 15m
2026-07-25 SWA1332 BUR → OAK Jul 25, 16:04 UTCJul 25, 18:20 UTC2h 16m
2026-07-25 SWA1661 OAK → LAS Jul 25, 13:25 UTCJul 25, 15:00 UTC1h 35m
2026-07-25 SWA1661 OAK → LAS Jul 25, 13:20 UTCJul 25, 14:55 UTC1h 35m
2026-07-25 SWA4504 ALB → BWI Jul 25, 10:40 UTCJul 25, 11:50 UTC1h 10m
2026-07-25 SWA4587 CUN → AUS Jul 25, 04:25 UTCJul 25, 06:35 UTC2h 10m
2026-07-25 SWA4587 CUN → AUS Jul 25, 04:23 UTCJul 25, 06:34 UTC2h 11m
2026-07-25 SWA1137 DCA → PVD Jul 25, 01:48 UTCJul 25, 03:30 UTC1h 42m
2026-07-24 SWA1137 DCA → PVD Jul 24, 23:20 UTCJul 25, 03:35 UTC4h 15m
2026-07-24 SWA120 MCI → BWI Jul 24, 21:05 UTCJul 24, 22:15 UTC1h 10m
2026-07-24 SWA2719 BUR → PHX Jul 24, 17:20 UTCJul 24, 19:40 UTC2h 20m
2026-07-24 SWA2719 BUR → PHX Jul 24, 17:15 UTCJul 24, 19:39 UTC2h 24m
2026-07-24 SWA4738 DEN → DTW Jul 24, 09:20 UTCJul 24, 16:10 UTC6h 50m
2026-07-24 SWA992 PHX → OAK Jul 24, 08:00 UTCJul 24, 08:15 UTC15m
2026-07-24 SWA992 PHX → OAK Jul 24, 05:30 UTCJul 24, 06:40 UTC1h 10m
2026-07-24 SWA2288 BWI → CHS Jul 24, 01:45 UTCJul 24, 04:10 UTC2h 25m
2026-07-23 SWA3079 SFO → LAX Jul 23, 21:45 UTCJul 23, 23:55 UTC2h 10m
2026-07-23 SWA314 BNA → BWI Jul 23, 19:35 UTCJul 23, 20:30 UTC55m
2026-07-23 SWA1007 LGB → OAK Jul 23, 17:40 UTCJul 23, 18:25 UTC45m
2026-07-23 SWA1007 LGB → OAK Jul 23, 17:37 UTCJul 23, 18:29 UTC52m
2026-07-23 SWA1024 HOU → SRQ Jul 23, 14:50 UTCJul 23, 16:15 UTC1h 25m
2026-07-23 SWA1024 HOU → SRQ Jul 23, 14:49 UTCJul 23, 16:11 UTC1h 22m
2026-07-23 SWA1130 OAK → ONT Jul 23, 12:55 UTCJul 23, 13:35 UTC40m
2026-07-23 SWA4336 SMF → LAS Jul 23, 05:00 UTCJul 23, 06:10 UTC1h 10m
2026-07-23 SWA4336 SMF → LAS Jul 23, 04:59 UTCJul 23, 06:25 UTC1h 26m
2026-07-23 SWA2701 SJC → BUR Jul 23, 00:10 UTCJul 23, 03:20 UTC3h 10m
2026-07-23 SWA2701 SJC → BUR Jul 23, 00:06 UTCJul 23, 03:20 UTC3h 14m
2026-07-22 SWA2701 SJC → BUR Jul 22, 21:00 UTCJul 22, 23:05 UTC2h 5m
2026-07-22 SWA1796 MDW → MSY Jul 22, 18:05 UTCJul 22, 19:40 UTC1h 35m
2026-07-22 SWA1796 MDW → MSY Jul 22, 18:02 UTCJul 22, 19:35 UTC1h 33m
2026-07-22 SWA4316 BWI → SAN Jul 22, 15:50 UTCJul 22, 16:45 UTC55m
2026-07-22 SWA4318 ECP → BWI Jul 22, 13:45 UTCJul 22, 14:35 UTC50m
2026-07-22 SWA679 MKE → PHX Jul 22, 11:35 UTCJul 22, 12:20 UTC45m
2026-07-22 SWA679 MKE → PHX Jul 22, 11:30 UTCJul 22, 12:14 UTC44m
2026-07-22 SWA4429 DAL → LBB Jul 22, 04:45 UTCJul 22, 05:25 UTC40m
2026-07-22 SWA2720 ATL → LGA Jul 22, 01:20 UTCJul 22, 03:40 UTC2h 20m
2026-07-21 SWA2720 ATL → LGA Jul 21, 22:40 UTCJul 22, 00:00 UTC1h 20m
2026-07-21 SWA1444 OAK → LAS Jul 21, 17:05 UTCJul 21, 20:50 UTC3h 45m
2026-07-21 SWA1444 OAK → LAS Jul 21, 14:20 UTCJul 21, 15:55 UTC1h 35m
2026-07-21 SWA4976 - Jul 21, 10:55 UTCJul 21, 12:20 UTC1h 25m
2026-07-21 SWA4976 MDW → DCA Jul 21, 10:51 UTCJul 21, 12:14 UTC1h 24m
2026-07-21 SWA4541 SLC → MDW Jul 21, 01:45 UTCJul 21, 05:20 UTC3h 35m

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 N8541W page for operator, model, and routing details .

Mode-S ABB8C4 frequently asked

What is Mode-S code ABB8C4?
ABB8C4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8541W.
Where is Mode-S ABB8C4 registered?
Mode-S code ABB8C4 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 ABB8C4 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ABB8C4, octal 52734304, decimal 11,253,956.
What flights does ABB8C4 operate?
Mode-S ABB8C4 has broadcast 20 distinct callsigns, including SWA1355, SWA436, SWA2518, SWA4015, SWA4302.