Apparatus

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sensors Mode-S transponder

A72CA2

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N561WN · BOEING 737-700 · operated by WILMINGTON TRUST CO TRUSTEE

Hex
A72CA2
Octal
51626242
Decimal
10,955,938
Country
US
Tail
N561WN
Type
B737
Broadcasting now · callsign SWA3999 · 39,000 ft
Flights observed
734
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:30 UTC

Current position

A72CA2 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A72CA2 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
SWA2137 Southwest Airlines 11 2026-04-17
SWA311 - 5 2026-06-25
SWA2973 - 5 2026-06-22
SWA1321 Southwest Airlines 5 2026-07-22
SWA988 - 4 2026-04-15
SWA739 - 4 2026-07-12
SWA652 Southwest Airlines 4 2026-05-24
SWA510 Southwest Airlines 4 2026-06-09
SWA496 - 4 2026-06-23
SWA4758 - 4 2026-07-08
SWA3850 Southwest Airlines 4 2026-07-08
SWA3604 - 4 2026-07-13
SWA3091 Southwest Airlines 4 2026-04-19
SWA300 - 4 2026-06-22
SWA2407 - 4 2026-07-13
SWA2170 Southwest Airlines 4 2026-05-22
SWA2068 - 4 2026-06-14
SWA1925 Southwest Airlines 4 2026-04-17
SWA1725 Southwest Airlines 4 2026-05-13
SWA149 - 4 2026-07-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA3698 LAS → SAT Jul 26, 21:10 UTCJul 26, 22:30 UTC1h 20m
2026-07-26 SWA3798 OAK → LAS Jul 26, 17:15 UTCJul 26, 19:55 UTC2h 40m
2026-07-26 SWA1222 BUR → OAK Jul 26, 13:05 UTCJul 26, 16:05 UTC3h 0m
2026-07-26 SWA3230 LAX → PHX Jul 26, 02:00 UTCJul 26, 03:30 UTC1h 30m
2026-07-26 SWA3230 LAX → PHX Jul 26, 01:59 UTCJul 26, 03:22 UTC1h 23m
2026-07-25 SWA2174 SAN → BWI Jul 25, 23:10 UTCJul 26, 01:10 UTC2h 0m
2026-07-25 SWA4349 BUR → SFO Jul 25, 20:10 UTCJul 25, 22:15 UTC2h 5m
2026-07-25 SWA768 SJC → AUS Jul 25, 17:00 UTCJul 25, 19:05 UTC2h 5m
2026-07-25 SWA2539 DEN → SJC Jul 25, 13:35 UTCJul 25, 15:40 UTC2h 5m
2026-07-25 SWA1165 LAX → PHX Jul 25, 11:20 UTCJul 25, 12:45 UTC1h 25m
2026-07-25 SWA3900 LAS → CMH Jul 25, 02:05 UTCJul 25, 03:10 UTC1h 5m
2026-07-25 SWA3900 LAS → CMH Jul 25, 02:02 UTCJul 25, 03:09 UTC1h 7m
2026-07-24 SWA1111 BUR → OAK Jul 24, 23:25 UTCJul 25, 01:15 UTC1h 50m
2026-07-24 SWA4536 DAL → AUS Jul 24, 20:55 UTCJul 24, 22:05 UTC1h 10m
2026-07-24 SWA1432 DEN → BNA Jul 24, 18:45 UTCJul 24, 19:45 UTC1h 0m
2026-07-24 SWA1432 DEN → BNA Jul 24, 16:05 UTCJul 24, 17:40 UTC1h 35m
2026-07-24 SWA1432 DEN → BNA Jul 24, 14:35 UTCJul 24, 15:10 UTC35m
2026-07-24 SWA2914 EUG → SJC Jul 24, 12:20 UTCJul 24, 13:35 UTC1h 15m
2026-07-24 SWA2225 MDW → BUF Jul 24, 01:45 UTCJul 24, 03:35 UTC1h 50m
2026-07-23 SWA1133 SNA → SJC Jul 23, 19:45 UTCJul 24, 00:45 UTC5h 0m
2026-07-23 SWA1133 SNA → SJC Jul 23, 17:20 UTCJul 23, 18:25 UTC1h 5m
2026-07-23 SWA3859 DEN → ORD Jul 23, 15:20 UTCJul 23, 16:15 UTC55m
2026-07-23 SWA3859 DEN → ORD Jul 23, 15:19 UTCJul 23, 16:11 UTC52m
2026-07-23 SWA3829 - Jul 23, 13:15 UTCJul 23, 14:20 UTC1h 5m
2026-07-23 SWA2507 PHX → BWI Jul 23, 03:25 UTCJul 23, 04:20 UTC55m
2026-07-23 SWA2507 PHX → BWI Jul 23, 03:20 UTCJul 23, 04:17 UTC57m
2026-07-23 SWA2876 MCO → BDL Jul 23, 01:35 UTCJul 23, 02:45 UTC1h 10m
2026-07-23 SWA2876 MCO → BDL Jul 23, 01:31 UTCJul 23, 02:40 UTC1h 9m
2026-07-22 SWA1321 DAL → LGA Jul 22, 23:15 UTCJul 23, 00:10 UTC55m
2026-07-22 SWA1321 DAL → LGA Jul 22, 23:12 UTCJul 23, 00:09 UTC57m
2026-07-22 SWA1321 DAL → LGA Jul 22, 21:35 UTCJul 22, 22:25 UTC50m
2026-07-22 SWA1321 DAL → LGA Jul 22, 18:20 UTCJul 22, 20:25 UTC2h 5m
2026-07-22 SWA1321 DAL → LGA Jul 22, 15:50 UTCJul 22, 17:25 UTC1h 35m
2026-07-21 SWA3669 ISP → BWI Jul 21, 15:10 UTCJul 21, 18:35 UTC3h 25m
2026-07-19 SWA2472 - Jul 19, 17:05 UTCJul 19, 22:20 UTC5h 15m
2026-07-19 SWA2472 BWI → PDX Jul 19, 17:03 UTCJul 19, 22:18 UTC5h 16m
2026-07-19 SWA4282 - Jul 19, 14:35 UTCJul 19, 15:55 UTC1h 20m
2026-07-19 SWA869 BUR → OAK Jul 19, 12:50 UTCJul 19, 13:40 UTC50m
2026-07-19 SWA3401 - Jul 19, 10:25 UTCJul 19, 11:45 UTC1h 20m
2026-07-18 SWA4609 BNA → MKE Jul 18, 22:40 UTCJul 19, 01:30 UTC2h 50m
2026-07-18 SWA4609 BNA → MKE Jul 18, 22:38 UTCJul 19, 01:24 UTC2h 46m
2026-07-18 SWA4171 - Jul 18, 18:00 UTCJul 18, 20:15 UTC2h 15m
2026-07-18 SWA4171 STL → RSW Jul 18, 17:58 UTCJul 18, 20:11 UTC2h 13m
2026-07-18 SWA2368 LAS → STL Jul 18, 14:00 UTCJul 18, 17:00 UTC3h 0m
2026-07-18 SWA2368 LAS → STL Jul 18, 13:58 UTCJul 18, 16:50 UTC2h 52m
2026-07-18 SWA3510 ISP → BWI Jul 18, 05:55 UTCJul 18, 06:40 UTC45m
2026-07-18 SWA3510 ISP → BWI Jul 18, 05:55 UTCJul 18, 06:45 UTC50m
2026-07-18 SWA3653 SFO → SAN Jul 18, 03:44 UTCJul 18, 04:58 UTC1h 15m
2026-07-18 SWA3653 SFO → SAN Jul 18, 03:45 UTCJul 18, 05:05 UTC1h 20m
2026-07-18 SWA3533 SAN → SFO Jul 18, 01:08 UTCJul 18, 02:13 UTC1h 5m

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 N561WN page for operator, model, and routing details .

Mode-S A72CA2 frequently asked

What is Mode-S code A72CA2?
A72CA2 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N561WN.
Where is Mode-S A72CA2 registered?
Mode-S code A72CA2 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 A72CA2 broadcasting right now?
Yes. Mode-S A72CA2 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A72CA2, octal 51626242, decimal 10,955,938.
What flights does A72CA2 operate?
Mode-S A72CA2 has broadcast 20 distinct callsigns, including SWA2137, SWA311, SWA2973, SWA1321, SWA988.