NDBC THREDDS Server Catalog https://dods.ndbc.noaa.gov/thredds/catalog/data/stdmet/20cm4/catalog.html

Dataset Size Last Modified
     Folder  20cm4   --
         20cm4.ncml 302.0 bytes 2017-11-15T16:15:18.839Z
         20cm4h2014.nc 28.69 Kbytes 2014-12-31T21:05:00Z
         20cm4h2015.nc 19.06 Kbytes 2015-09-20T16:55:00Z

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