Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

AC2173

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8809L · BOEING 737 MAX 8 · operated by SOUTHWEST AIRLINES CO

Hex
AC2173
Octal
53020563
Decimal
11,280,755
Country
US
Tail
N8809L
Type
B38M
No current signal · last broadcast 52m ago
Flights observed
562
Distinct callsigns
20
Country
US
Last broadcast
52m ago

Last known position

Most recent position reported by Mode-S AC2173.

Country allocation

The ICAO 24-bit address AC2173 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
SWA899 Southwest Airlines 4 2026-06-10
SWA858 - 4 2026-06-16
SWA2797 - 4 2026-06-23
SWA241 Southwest Airlines 4 2026-05-23
SWA2094 Southwest Airlines 4 2026-04-17
SWA1853 Southwest Airlines 4 2026-04-13
SWA1277 Southwest Airlines 4 2026-06-11
SWA8503 Southwest Airlines 3 2026-05-12
SWA786 Southwest Airlines 3 2026-04-29
SWA660 Southwest Airlines 3 2026-05-01
SWA543 Southwest Airlines 3 2026-05-27
SWA4943 Southwest Airlines 3 2026-04-14
SWA486 - 3 2026-07-08
SWA4299 Southwest Airlines 3 2026-05-23
SWA3728 Southwest Airlines 3 2026-06-15
SWA3685 - 3 2026-06-28
SWA3547 Southwest Airlines 3 2026-05-29
SWA3417 Southwest Airlines 3 2026-04-17
SWA3354 - 3 2026-07-10
SWA2701 - 3 2026-07-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SWA4789 - Jul 14, 03:25 UTCJul 14, 04:10 UTC45m
2026-07-13 SWA3247 - Jul 13, 23:35 UTCJul 14, 02:25 UTC2h 50m
2026-07-13 SWA3247 ONT → DAL Jul 13, 23:31 UTCJul 14, 02:16 UTC2h 45m
2026-07-13 SWA1375 DAL → ONT Jul 13, 19:45 UTCJul 13, 22:15 UTC2h 30m
2026-07-13 SWA1794 - Jul 13, 15:05 UTCJul 13, 18:30 UTC3h 25m
2026-07-13 SWA3066 OAK → PHX Jul 13, 12:25 UTCJul 13, 14:00 UTC1h 35m
2026-07-13 SWA1454 - Jul 13, 07:15 UTCJul 13, 08:45 UTC1h 30m
2026-07-13 SWA1454 DEN → PHX Jul 13, 04:40 UTCJul 13, 06:05 UTC1h 25m
2026-07-13 SWA2589 - Jul 13, 00:01 UTCJul 13, 02:40 UTC2h 40m
2026-07-12 SWA2589 BUF → DEN Jul 12, 23:55 UTCJul 13, 02:39 UTC2h 44m
2026-07-12 SWA4728 BNA → BUF Jul 12, 21:05 UTCJul 12, 22:30 UTC1h 25m
2026-07-12 SWA4003 TPA → BNA Jul 12, 16:30 UTCJul 12, 18:01 UTC1h 30m
2026-07-12 SWA4003 TPA → BNA Jul 12, 16:26 UTCJul 12, 17:58 UTC1h 32m
2026-07-12 SWA1120 - Jul 12, 13:15 UTCJul 12, 15:15 UTC2h 0m
2026-07-12 SWA4364 ATL → BWI Jul 12, 10:31 UTCJul 12, 11:54 UTC1h 23m
2026-07-12 SWA4364 ATL → BWI Jul 12, 10:30 UTCJul 12, 11:55 UTC1h 25m
2026-07-11 SWA1495 DEN → ATL Jul 11, 21:10 UTCJul 11, 23:45 UTC2h 35m
2026-07-11 SWA699 - Jul 11, 17:55 UTCJul 11, 19:20 UTC1h 25m
2026-07-11 SWA4601 - Jul 11, 15:05 UTCJul 11, 16:40 UTC1h 35m
2026-07-11 SWA1685 - Jul 11, 04:55 UTCJul 11, 06:15 UTC1h 20m
2026-07-11 SWA3843 LAS → DEN Jul 11, 02:15 UTCJul 11, 03:40 UTC1h 25m
2026-07-11 SWA2213 ONT → LAS Jul 11, 00:35 UTCJul 11, 01:20 UTC45m
2026-07-11 SWA2213 ONT → LAS Jul 11, 00:35 UTCJul 11, 01:14 UTC39m
2026-07-10 SWA855 BNA → ONT Jul 10, 20:00 UTCJul 10, 23:35 UTC3h 35m
2026-07-10 SWA855 BNA → ONT Jul 10, 19:56 UTCJul 10, 23:31 UTC3h 35m
2026-07-10 SWA4472 - Jul 10, 15:55 UTCJul 10, 18:25 UTC2h 30m
2026-07-10 SWA4472 BDL → BNA Jul 10, 15:55 UTCJul 10, 18:14 UTC2h 19m
2026-07-10 SWA2731 - Jul 10, 12:55 UTCJul 10, 14:30 UTC1h 35m
2026-07-10 SWA2731 MDW → BDL Jul 10, 12:51 UTCJul 10, 14:28 UTC1h 37m
2026-07-10 SWA1008 STL → MDW Jul 10, 10:50 UTCJul 10, 11:35 UTC45m
2026-07-10 SWA1008 STL → MDW Jul 10, 10:50 UTCJul 10, 11:30 UTC40m
2026-07-10 SWA3354 PHX → STL Jul 10, 04:05 UTCJul 10, 06:35 UTC2h 30m
2026-07-10 SWA3354 PHX → STL Jul 10, 04:01 UTCJul 10, 06:30 UTC2h 29m
2026-07-10 SWA3354 SEA → PHX Jul 10, 00:50 UTCJul 10, 03:05 UTC2h 15m
2026-07-09 SWA393 AUS → SEA Jul 9, 19:45 UTCJul 9, 23:35 UTC3h 50m
2026-07-09 SWA450 - Jul 9, 16:50 UTCJul 9, 18:30 UTC1h 40m
2026-07-09 SWA4638 - Jul 9, 13:55 UTCJul 9, 15:45 UTC1h 50m
2026-07-09 SWA4627 - Jul 9, 10:35 UTCJul 9, 12:45 UTC2h 10m
2026-07-09 SWA4627 BWI → FLL Jul 9, 10:32 UTCJul 9, 12:51 UTC2h 19m
2026-07-08 SWA3299 LAS → BWI Jul 8, 20:50 UTCJul 9, 00:55 UTC4h 5m
2026-07-08 SWA486 - Jul 8, 17:15 UTCJul 8, 19:30 UTC2h 15m
2026-07-08 SWA486 DAL → LAS Jul 8, 17:10 UTCJul 8, 19:26 UTC2h 16m
2026-07-08 SWA486 - Jul 8, 15:10 UTCJul 8, 16:00 UTC50m
2026-07-08 SWA801 - Jul 8, 13:10 UTCJul 8, 13:55 UTC45m
2026-07-08 SWA2039 IND → DAL Jul 8, 10:05 UTCJul 8, 11:40 UTC1h 35m
2026-07-08 SWA2248 - Jul 8, 00:35 UTCJul 8, 03:45 UTC3h 10m
2026-07-07 SWA1809 - Jul 7, 19:00 UTCJul 7, 23:10 UTC4h 10m
2026-07-07 SWA2088 - Jul 7, 16:00 UTCJul 7, 17:40 UTC1h 40m
2026-07-07 SWA934 - Jul 7, 13:35 UTCJul 7, 14:40 UTC1h 5m
2026-07-07 SWA2049 - Jul 7, 11:45 UTCJul 7, 12:30 UTC45m

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 N8809L page for operator, model, and routing details .

Mode-S AC2173 frequently asked

What is Mode-S code AC2173?
AC2173 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8809L.
Where is Mode-S AC2173 registered?
Mode-S code AC2173 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 AC2173 broadcasting right now?
No active broadcast right now. Last signal was 52m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC2173, octal 53020563, decimal 11,280,755.
What flights does AC2173 operate?
Mode-S AC2173 has broadcast 20 distinct callsigns, including SWA899, SWA858, SWA2797, SWA241, SWA2094.