NDBC THREDDS Server Catalog https://dods.ndbc.noaa.gov/thredds/catalog/data/stdmet/sixa2/catalog.html

Dataset Size Last Modified
     Folder  sixa2   --
         sixa2.ncml 302.0 bytes 2021-02-20T13:00:02.198Z
         sixa2h2020.nc 167.1 Kbytes 2020-12-31T23:55:00Z
         sixa2h2021.nc 44.26 Kbytes 2021-01-06T01:05:00Z

National Data Buoy Center THREDDS Server at National Data Buoy Center see Info
THREDDS Data Server [Version 4.6.14 - 2019-07-23T11:04:31-0600] Documentation