Apparatus

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sensors Mode-S transponder

ABDC78

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8631A · BOEING 737-800 · operated by SOUTHWEST AIRLINES CO

Hex
ABDC78
Octal
52756170
Decimal
11,263,096
Country
US
Tail
N8631A
Type
B738
No current signal · last broadcast Jul 26, 20:40 UTC
Flights observed
758
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:40 UTC

Last known position

Most recent position reported by Mode-S ABDC78.

Country allocation

The ICAO 24-bit address ABDC78 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
SWA3999 Southwest Airlines 7 2026-05-18
SWA4517 - 6 2026-07-03
SWA849 Southwest Airlines 5 2026-05-18
SWA1081 Southwest Airlines 5 2026-05-19
SWA908 Southwest Airlines 4 2026-05-23
SWA859 - 4 2026-06-27
SWA657 - 4 2026-06-24
SWA3793 - 4 2026-06-27
SWA3670 Southwest Airlines 4 2026-06-03
SWA3149 Southwest Airlines 4 2026-07-26
SWA249 - 4 2026-06-20
SWA2183 Southwest Airlines 4 2026-07-25
SWA2140 Southwest Airlines 4 2026-06-02
SWA2126 - 4 2026-06-28
SWA1508 Southwest Airlines 4 2026-06-08
SWA1406 - 4 2026-06-26
SWA1277 Southwest Airlines 4 2026-06-08
SWA1062 Southwest Airlines 4 2026-04-29
SWA1048 - 4 2026-06-29
SWA930 - 3 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA2768 SJC → BOI Jul 26, 18:35 UTCJul 26, 20:40 UTC2h 5m
2026-07-26 SWA3149 AUS → OAK Jul 26, 15:35 UTCJul 26, 17:15 UTC1h 40m
2026-07-26 SWA3149 AUS → OAK Jul 26, 15:32 UTCJul 26, 17:14 UTC1h 42m
2026-07-26 SWA1470 LAS → SFO Jul 26, 13:00 UTCJul 26, 14:35 UTC1h 35m
2026-07-26 SWA1470 LAS → SFO Jul 26, 12:59 UTCJul 26, 14:37 UTC1h 38m
2026-07-26 SWA4057 BWI → BOS Jul 26, 10:15 UTCJul 26, 11:40 UTC1h 25m
2026-07-26 SWA4339 BWI → ALB Jul 26, 02:55 UTCJul 26, 05:05 UTC2h 10m
2026-07-26 SWA4339 BWI → ALB Jul 26, 02:50 UTCJul 26, 05:05 UTC2h 15m
2026-07-25 SWA2183 SFO → SAN Jul 25, 22:40 UTCJul 25, 23:30 UTC50m
2026-07-25 SWA2183 SFO → SAN Jul 25, 22:38 UTCJul 25, 23:29 UTC51m
2026-07-25 SWA2183 SFO → SAN Jul 25, 17:55 UTCJul 25, 21:25 UTC3h 30m
2026-07-25 SWA4775 PHX → SFO Jul 25, 16:05 UTCJul 25, 17:00 UTC55m
2026-07-25 SWA4979 DAL → ORD Jul 25, 13:35 UTCJul 25, 15:05 UTC1h 30m
2026-07-25 SWA1388 DEN → PDX Jul 25, 01:05 UTCJul 25, 02:20 UTC1h 15m
2026-07-24 SWA1388 DEN → PDX Jul 24, 22:25 UTCJul 24, 23:55 UTC1h 30m
2026-07-24 SWA503 LAX → STL Jul 24, 19:00 UTCJul 24, 21:15 UTC2h 15m
2026-07-24 SWA3478 MIA → BNA Jul 24, 14:10 UTCJul 24, 17:45 UTC3h 35m
2026-07-24 SWA1704 ORD → MCO Jul 24, 04:15 UTCJul 24, 06:10 UTC1h 55m
2026-07-24 SWA3741 BDL → BWI Jul 24, 01:45 UTCJul 24, 02:50 UTC1h 5m
2026-07-24 SWA3741 BDL → BWI Jul 24, 01:41 UTCJul 24, 02:49 UTC1h 9m
2026-07-23 SWA4791 PHX → OAK Jul 23, 21:40 UTCJul 24, 00:45 UTC3h 5m
2026-07-23 SWA4791 PHX → OAK Jul 23, 21:38 UTCJul 24, 00:40 UTC3h 2m
2026-07-23 SWA951 SAN → SFO Jul 23, 06:45 UTCJul 23, 10:25 UTC3h 40m
2026-07-23 SWA951 SAN → SFO Jul 23, 06:41 UTCJul 23, 10:24 UTC3h 43m
2026-07-23 SWA3705 MCO → MHT Jul 23, 02:45 UTCJul 23, 04:20 UTC1h 35m
2026-07-23 SWA4307 RSW → MKE Jul 23, 01:00 UTCJul 23, 01:45 UTC45m
2026-07-22 SWA3684 LGA → TPA Jul 22, 23:00 UTCJul 23, 00:00 UTC1h 0m
2026-07-22 SWA3684 LGA → TPA Jul 22, 23:00 UTCJul 22, 23:54 UTC54m
2026-07-22 SWA994 ATL → MDW Jul 22, 20:25 UTCJul 22, 22:05 UTC1h 40m
2026-07-22 SWA994 ATL → MDW Jul 22, 20:23 UTCJul 22, 22:00 UTC1h 37m
2026-07-22 SWA4873 MCO → ATL Jul 22, 17:25 UTCJul 22, 19:05 UTC1h 40m
2026-07-22 SWA3824 BNA → DCA Jul 22, 13:30 UTCJul 22, 16:15 UTC2h 45m
2026-07-22 SWA3285 - Jul 22, 11:15 UTCJul 22, 11:55 UTC40m
2026-07-22 SWA1974 - Jul 22, 01:10 UTCJul 22, 02:30 UTC1h 20m
2026-07-21 SWA4498 TUL → PHX Jul 21, 20:45 UTCJul 21, 23:30 UTC2h 45m
2026-07-21 SWA1806 LIH → SJC Jul 21, 16:35 UTCJul 21, 19:15 UTC2h 40m
2026-07-21 SWA1806 LIH → SJC Jul 21, 16:33 UTCJul 21, 19:12 UTC2h 40m
2026-07-21 SWA2215 CLE → DEN Jul 21, 13:30 UTCJul 21, 15:30 UTC2h 0m
2026-07-21 SWA1186 DAL → ORD Jul 21, 09:35 UTCJul 21, 12:25 UTC2h 50m
2026-07-21 SWA1186 DAL → ORD Jul 21, 09:30 UTCJul 21, 12:17 UTC2h 47m
2026-07-21 SWA1707 PHX → SFO Jul 21, 04:30 UTCJul 21, 06:45 UTC2h 15m
2026-07-21 SWA437 ATL → MDW Jul 21, 01:00 UTCJul 21, 03:20 UTC2h 20m
2026-07-21 SWA437 ATL → MDW Jul 21, 00:57 UTCJul 21, 03:18 UTC2h 22m
2026-07-20 SWA437 ATL → MDW Jul 20, 22:45 UTCJul 21, 00:10 UTC1h 24m
2026-07-20 SWA4861 RIC → MDW Jul 20, 18:30 UTCJul 20, 21:25 UTC2h 55m
2026-07-20 SWA4861 RIC → MDW Jul 20, 18:30 UTCJul 20, 21:26 UTC2h 56m
2026-07-20 SWA4044 LAS → STL Jul 20, 15:30 UTCJul 20, 17:05 UTC1h 35m
2026-07-20 SWA2039 LAS → OAK Jul 20, 11:35 UTCJul 20, 13:40 UTC2h 5m
2026-07-20 SWA2244 SJC → SAN Jul 20, 04:10 UTCJul 20, 06:50 UTC2h 40m
2026-07-20 SWA2102 PHX → LAS Jul 20, 02:15 UTCJul 20, 02:55 UTC40m

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 N8631A page for operator, model, and routing details .

Mode-S ABDC78 frequently asked

What is Mode-S code ABDC78?
ABDC78 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8631A.
Where is Mode-S ABDC78 registered?
Mode-S code ABDC78 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 ABDC78 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ABDC78, octal 52756170, decimal 11,263,096.
What flights does ABDC78 operate?
Mode-S ABDC78 has broadcast 20 distinct callsigns, including SWA3999, SWA4517, SWA849, SWA1081, SWA908.