NDBC THREDDS Server Catalog https://dods.ndbc.noaa.gov/thredds/catalog/data/stdmet/sipm6/catalog.html

Dataset Size Last Modified
     Folder  sipm6   --
         sipm6.ncml 302.0 bytes 2017-11-15T16:15:20.123Z
         sipm6h2004.nc 24.50 Kbytes 2004-11-15T23:00:00Z
         sipm6h2005.nc 62.97 Kbytes 2005-06-30T21:00:00Z

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