NDBC THREDDS Server Catalog https://dods.ndbc.noaa.gov/thredds/catalog/data/stdmet/imgp4/catalog.html

Dataset Size Last Modified
     Folder  imgp4   --
         imgp4.ncml 302.0 bytes 2017-11-15T16:15:19.673Z
         imgp4h2014.nc 2.650 Mbytes 2014-12-31T23:55:00Z
         imgp4h2015.nc 4.179 Mbytes 2015-12-31T23:55:00Z
         imgp4h2016.nc 3.306 Mbytes 2016-12-31T23:55:00Z
         imgp4h2017.nc 4.120 Mbytes 2017-09-20T07:40:00Z

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