NDBC THREDDS Server Catalog https://dods.ndbc.noaa.gov/thredds/catalog/data/dart/21420/catalog.html

Dataset Size Last Modified
     Folder  21420   --
         21420.ncml 300.0 bytes 2020-03-20T13:00:02Z
         21420t2019.nc 142.0 Kbytes 2019-12-31T23:45:00Z
         21420t2020.nc 423.1 Kbytes 2020-12-31T23:45:00Z
         21420t2021.nc 249.2 Kbytes 2021-07-31T23:45:00Z
         21420t9999.nc 776.4 Kbytes 2021-09-08T18:00:00Z

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