Apparatus

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sensors Mode-S transponder

ABB8A0

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8540V · BOEING 737-800 · operated by SOUTHWEST AIRLINES CO

Hex
ABB8A0
Octal
52734240
Decimal
11,253,920
Country
US
Tail
N8540V
Type
B738
No current signal · last broadcast 14m ago
Flights observed
411
Distinct callsigns
20
Country
US
Last broadcast
14m ago

Last known position

Most recent position reported by Mode-S ABB8A0.

Country allocation

The ICAO 24-bit address ABB8A0 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
SWA573 Southwest Airlines 5 2026-05-04
SWA3630 - 5 2026-07-09
SWA805 Southwest Airlines 4 2026-04-29
SWA4136 - 4 2026-06-30
SWA239 - 4 2026-06-20
SWA1624 - 4 2026-07-04
SWA1370 Southwest Airlines 4 2026-06-16
SWA865 Southwest Airlines 3 2026-04-14
SWA560 - 3 2026-06-22
SWA557 - 3 2026-04-13
SWA478 - 3 2026-07-07
SWA477 - 3 2026-06-27
SWA470 Southwest Airlines 3 2026-06-14
SWA4537 Southwest Airlines 3 2026-06-22
SWA446 Southwest Airlines 3 2026-06-12
SWA4392 Southwest Airlines 3 2026-06-25
SWA3793 Southwest Airlines 3 2026-04-16
SWA3668 - 3 2026-07-12
SWA3525 Southwest Airlines 3 2026-06-10
SWA3114 Southwest Airlines 3 2026-04-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SWA1211 - Jul 14, 02:00 UTCJul 14, 04:00 UTC2h 0m
2026-07-13 SWA1798 - Jul 13, 23:20 UTCJul 14, 00:40 UTC1h 20m
2026-07-13 SWA946 - Jul 13, 20:50 UTCJul 13, 21:50 UTC1h 0m
2026-07-13 SWA4719 MCO → AUS Jul 13, 17:00 UTCJul 13, 19:35 UTC2h 35m
2026-07-13 SWA2130 - Jul 13, 13:20 UTCJul 13, 15:05 UTC1h 45m
2026-07-13 SWA331 TPA → IND Jul 13, 10:20 UTCJul 13, 12:15 UTC1h 55m
2026-07-13 SWA2232 - Jul 13, 02:05 UTCJul 13, 05:01 UTC2h 55m
2026-07-12 SWA3668 - Jul 12, 22:45 UTCJul 13, 00:50 UTC2h 5m
2026-07-12 SWA1183 - Jul 12, 20:40 UTCJul 12, 21:35 UTC55m
2026-07-12 SWA1183 - Jul 12, 16:50 UTCJul 12, 19:10 UTC2h 20m
2026-07-12 SWA4605 OAK → DAL Jul 12, 12:28 UTCJul 12, 15:39 UTC3h 11m
2026-07-12 SWA4605 OAK → DAL Jul 12, 12:30 UTCJul 12, 15:40 UTC3h 10m
2026-07-12 SWA3082 ONT → OAK Jul 12, 03:50 UTCJul 12, 04:40 UTC50m
2026-07-12 SWA3082 ONT → OAK Jul 12, 03:50 UTCJul 12, 04:40 UTC50m
2026-07-12 SWA372 AUS → ONT Jul 12, 00:34 UTCJul 12, 02:56 UTC2h 22m
2026-07-12 SWA372 AUS → ONT Jul 12, 00:35 UTCJul 12, 03:01 UTC2h 25m
2026-07-11 SWA1478 DEN → AUS Jul 11, 21:41 UTCJul 11, 23:17 UTC1h 36m
2026-07-11 SWA1478 DEN → AUS Jul 11, 21:45 UTCJul 11, 23:20 UTC1h 35m
2026-07-11 SWA2711 - Jul 11, 18:50 UTCJul 11, 20:00 UTC1h 10m
2026-07-11 SWA2711 AUS → DEN Jul 11, 18:49 UTCJul 11, 20:31 UTC1h 42m
2026-07-11 SWA3980 SJC → AUS Jul 11, 14:18 UTCJul 11, 17:23 UTC3h 5m
2026-07-11 SWA3980 SJC → AUS Jul 11, 14:20 UTCJul 11, 17:25 UTC3h 5m
2026-07-11 SWA1727 DEN → SJC Jul 11, 02:49 UTCJul 11, 04:55 UTC2h 6m
2026-07-11 SWA1727 DEN → SJC Jul 11, 02:50 UTCJul 11, 04:55 UTC2h 5m
2026-07-10 SWA3668 - Jul 10, 22:25 UTCJul 11, 01:10 UTC2h 45m
2026-07-10 SWA3668 SJC → DEN Jul 10, 22:23 UTCJul 11, 01:13 UTC2h 50m
2026-07-10 SWA1181 - Jul 10, 20:25 UTCJul 10, 21:20 UTC55m
2026-07-10 SWA1181 - Jul 10, 14:10 UTCJul 10, 19:20 UTC5h 10m
2026-07-10 SWA2536 - Jul 10, 10:10 UTCJul 10, 12:05 UTC1h 55m
2026-07-10 SWA563 - Jul 10, 03:50 UTCJul 10, 05:15 UTC1h 25m
2026-07-09 SWA4600 PHX → BNA Jul 9, 23:15 UTCJul 10, 02:30 UTC3h 15m
2026-07-09 SWA1681 - Jul 9, 20:45 UTCJul 9, 22:15 UTC1h 30m
2026-07-09 SWA3774 SMF → DEN Jul 9, 17:30 UTCJul 9, 19:35 UTC2h 5m
2026-07-09 SWA3630 SEA → SMF Jul 9, 14:55 UTCJul 9, 16:15 UTC1h 20m
2026-07-09 SWA4920 SMF → SEA Jul 9, 12:05 UTCJul 9, 13:35 UTC1h 30m
2026-07-09 SWA3757 SLC → SMF Jul 9, 01:05 UTCJul 9, 02:25 UTC1h 20m
2026-07-09 SWA3757 SLC → SMF Jul 9, 01:04 UTCJul 9, 02:20 UTC1h 16m
2026-07-08 SWA2344 DEN → OAK Jul 8, 22:50 UTCJul 9, 00:10 UTC1h 20m
2026-07-08 SWA1745 - Jul 8, 20:25 UTCJul 8, 21:40 UTC1h 15m
2026-07-08 SWA2774 - Jul 8, 16:15 UTCJul 8, 18:30 UTC2h 15m
2026-07-08 SWA999 - Jul 8, 01:50 UTCJul 8, 03:20 UTC1h 30m
2026-07-07 SWA478 - Jul 7, 23:55 UTCJul 8, 00:45 UTC50m
2026-07-07 SWA478 CLT → BWI Jul 7, 23:53 UTCJul 8, 00:47 UTC54m
2026-07-07 SWA478 - Jul 7, 21:30 UTCJul 7, 22:20 UTC50m
2026-07-07 SWA2524 - Jul 7, 18:10 UTCJul 7, 19:55 UTC1h 45m
2026-07-07 SWA2524 - Jul 7, 15:45 UTCJul 7, 16:45 UTC1h 0m
2026-07-07 SWA2022 DEN → OAK Jul 7, 13:40 UTCJul 7, 14:40 UTC1h 0m
2026-07-07 SWA2022 DEN → OAK Jul 7, 13:38 UTCJul 7, 14:41 UTC1h 3m
2026-07-07 SWA2244 - Jul 7, 04:20 UTCJul 7, 06:50 UTC2h 30m
2026-07-07 SWA2244 LAS → HOU Jul 7, 04:19 UTCJul 7, 06:52 UTC2h 34m

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 N8540V page for operator, model, and routing details .

Mode-S ABB8A0 frequently asked

What is Mode-S code ABB8A0?
ABB8A0 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8540V.
Where is Mode-S ABB8A0 registered?
Mode-S code ABB8A0 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 ABB8A0 broadcasting right now?
No active broadcast right now. Last signal was 14m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ABB8A0, octal 52734240, decimal 11,253,920.
What flights does ABB8A0 operate?
Mode-S ABB8A0 has broadcast 20 distinct callsigns, including SWA573, SWA3630, SWA805, SWA4136, SWA239.