Apparatus

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sensors Mode-S transponder

AC1720

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8785L · BOEING 737 MAX 8 · operated by SOUTHWEST AIRLINES CO

Hex
AC1720
Octal
53013440
Decimal
11,278,112
Country
US
Tail
N8785L
Type
B38M
No current signal · last broadcast Jul 26, 18:50 UTC
Flights observed
669
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 18:50 UTC

Last known position

Most recent position reported by Mode-S AC1720.

Country allocation

The ICAO 24-bit address AC1720 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
SWA2236 Southwest Airlines 9 2026-05-20
SWA2262 Southwest Airlines 7 2026-07-21
SWA1890 Southwest Airlines 6 2026-05-24
SWA1881 Southwest Airlines 6 2026-05-06
SWA3597 - 5 2026-06-30
SWA3089 Southwest Airlines 5 2026-07-23
SWA2848 - 5 2026-06-25
SWA2603 Southwest Airlines 5 2026-05-03
SWA900 Southwest Airlines 4 2026-06-08
SWA873 Southwest Airlines 4 2026-05-03
SWA4109 Southwest Airlines 4 2026-07-25
SWA3708 Southwest Airlines 4 2026-04-13
SWA3133 - 4 2026-07-04
SWA2839 Southwest Airlines 4 2026-04-15
SWA2666 Southwest Airlines 4 2026-05-25
SWA2397 - 4 2026-07-12
SWA218 Southwest Airlines 4 2026-05-09
SWA1647 Southwest Airlines 4 2026-04-18
SWA965 - 3 2026-07-03
SWA948 Southwest Airlines 3 2026-05-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA1938 SJC → AUS Jul 26, 18:30 UTCJul 26, 18:50 UTC20m
2026-07-25 SWA4109 OAK → PSP Jul 25, 16:35 UTCJul 25, 22:35 UTC6h 0m
2026-07-25 SWA4109 OAK → PSP Jul 25, 16:33 UTCJul 25, 22:37 UTC6h 4m
2026-07-25 SWA2171 DEN → SMF Jul 25, 10:35 UTCJul 25, 11:45 UTC1h 10m
2026-07-25 SWA2171 DEN → SMF Jul 25, 06:35 UTCJul 25, 06:50 UTC15m
2026-07-25 SWA3099 STL → BOS Jul 25, 00:05 UTCJul 25, 00:20 UTC15m
2026-07-24 SWA2138 BNA → PHL Jul 24, 22:20 UTCJul 24, 22:30 UTC10m
2026-07-24 SWA2138 BNA → PHL Jul 24, 16:40 UTCJul 24, 17:50 UTC1h 10m
2026-07-24 SWA2138 BNA → PHL Jul 24, 16:37 UTCJul 24, 22:30 UTC5h 53m
2026-07-24 SWA3815 DAL → PHX Jul 24, 12:20 UTCJul 24, 13:55 UTC1h 35m
2026-07-24 SWA3815 DAL → PHX Jul 24, 12:20 UTCJul 24, 13:48 UTC1h 28m
2026-07-24 SWA1744 HOU → LGA Jul 24, 05:40 UTCJul 24, 06:00 UTC20m
2026-07-24 SWA1744 HOU → LGA Jul 24, 05:37 UTCJul 24, 07:35 UTC1h 58m
2026-07-24 SWA3843 ABQ → LAS Jul 24, 02:00 UTCJul 24, 03:25 UTC1h 25m
2026-07-23 SWA3333 MAF → AUS Jul 23, 23:00 UTCJul 23, 23:55 UTC55m
2026-07-23 SWA1221 DCA → HOU Jul 23, 21:00 UTCJul 23, 21:55 UTC55m
2026-07-23 SWA1221 DCA → HOU Jul 23, 20:59 UTCJul 23, 21:54 UTC55m
2026-07-23 SWA323 SBA → OAK Jul 23, 17:35 UTCJul 23, 19:55 UTC2h 20m
2026-07-23 SWA323 SBA → OAK Jul 23, 17:33 UTCJul 23, 19:50 UTC2h 18m
2026-07-23 SWA3034 MCO → MSY Jul 23, 12:53 UTCJul 23, 16:00 UTC3h 7m
2026-07-23 SWA3034 MCO → MSY Jul 23, 12:55 UTCJul 23, 16:05 UTC3h 10m
2026-07-23 SWA4554 MCO → CMH Jul 23, 04:05 UTCJul 23, 04:55 UTC50m
2026-07-23 SWA3089 BWI → MSY Jul 23, 01:55 UTCJul 23, 02:55 UTC1h 0m
2026-07-22 SWA3089 BWI → MSY Jul 22, 23:40 UTCJul 23, 00:20 UTC40m
2026-07-22 SWA2515 LAS → OAK Jul 22, 00:15 UTCJul 22, 00:35 UTC20m
2026-07-22 SWA2515 LAS → OAK Jul 22, 00:00 UTCJul 22, 00:33 UTC33m
2026-07-21 SWA2262 BDL → BWI Jul 21, 17:00 UTCJul 21, 23:00 UTC6h 0m
2026-07-21 SWA2262 BDL → BWI Jul 21, 16:56 UTCJul 21, 23:05 UTC6h 9m
2026-07-21 SWA2251 - Jul 21, 11:30 UTCJul 21, 13:55 UTC2h 25m
2026-07-21 SWA2026 BWI → FLL Jul 21, 02:40 UTCJul 21, 04:35 UTC1h 55m
2026-07-20 SWA1018 CUN → DEN Jul 20, 21:05 UTCJul 21, 00:20 UTC3h 14m
2026-07-20 SWA1735 PHX → CUN Jul 20, 15:30 UTCJul 20, 19:05 UTC3h 35m
2026-07-20 SWA635 - Jul 20, 10:40 UTCJul 20, 13:40 UTC3h 0m
2026-07-20 SWA1278 DAL → BNA Jul 20, 03:45 UTCJul 20, 05:15 UTC1h 30m
2026-07-20 SWA1278 DAL → BNA Jul 20, 03:43 UTCJul 20, 05:10 UTC1h 27m
2026-07-19 SWA4401 LGA → DAL Jul 19, 23:40 UTCJul 20, 02:45 UTC3h 5m
2026-07-19 SWA4731 BNA → LGA Jul 19, 19:20 UTCJul 19, 21:10 UTC1h 50m
2026-07-19 SWA3362 - Jul 19, 17:05 UTCJul 19, 18:20 UTC1h 15m
2026-07-19 SWA3362 PIT → BNA Jul 19, 17:00 UTCJul 19, 18:11 UTC1h 11m
2026-07-19 SWA784 - Jul 19, 13:55 UTCJul 19, 15:55 UTC2h 0m
2026-07-19 SWA784 TPA → PIT Jul 19, 13:53 UTCJul 19, 15:54 UTC2h 1m
2026-07-18 SWA1044 BWI → PVD Jul 18, 23:55 UTCJul 19, 04:05 UTC4h 10m
2026-07-18 SWA1044 BWI → PVD Jul 18, 23:55 UTCJul 19, 04:11 UTC4h 16m
2026-07-18 SWA4676 - Jul 18, 21:55 UTCJul 18, 22:50 UTC55m
2026-07-18 SWA4676 RNO → LAS Jul 18, 21:52 UTCJul 18, 22:46 UTC54m
2026-07-18 SWA4685 - Jul 18, 19:35 UTCJul 18, 20:25 UTC50m
2026-07-18 SWA1295 OAK → LAS Jul 18, 16:37 UTCJul 18, 17:42 UTC1h 5m
2026-07-18 SWA1295 OAK → LAS Jul 18, 16:40 UTCJul 18, 17:45 UTC1h 5m
2026-07-18 SWA3977 - Jul 18, 14:35 UTCJul 18, 15:35 UTC1h 0m
2026-07-18 SWA512 - Jul 18, 07:40 UTCJul 18, 12:35 UTC4h 55m

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 N8785L page for operator, model, and routing details .

Mode-S AC1720 frequently asked

What is Mode-S code AC1720?
AC1720 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8785L.
Where is Mode-S AC1720 registered?
Mode-S code AC1720 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 AC1720 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 18:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC1720, octal 53013440, decimal 11,278,112.
What flights does AC1720 operate?
Mode-S AC1720 has broadcast 20 distinct callsigns, including SWA2236, SWA2262, SWA1890, SWA1881, SWA3597.