To understand the data you are getting it is necessary to look at the capabilities of the WMS server. This should be available via a capabilities request. This is an example capabilities request to NASA's OnEarth server.
r.in.wms2 -c url=http://wms.cuzk.cz/wms.asp
r.in.wms2 url=http://iceds.ge.ucl.ac.uk/cgi-bin/icedswms layers=bluemarble,landsat_1_01 styles=default,default output=landsat srs=4326 format=png
r.in.wms2 url=http://132.156.97.59/cgi-bin/worldmin_en-ca_ows layers=GSC:WORLD_PrecambrianDomains output=pokus srs=4326 format=jpeg
r.in.wms2 url=http://gpp3-wxs.ign.fr/yourAPIkey/geoportail/wmts layers=ORTHOIMAGERY.ORTHOPHOTOS output=orthophoto srs=3857 format=jpeg driver=WMTS_GRASS style=normal password=* username=*
r.in.wms2 output=global_mosaic url=http://onearth.jpl.nasa.gov/wms.cgi layers='Global Mosaic, visual' driver=OnEarth_GRASS
r.in.wms2 output=kn url=http://wms.cuzk.cz/wms.asp layers=prehledka_kraju-linie srs=4326 format=png
r.in.wms2 url=http://geoportal.cuzk.cz/WMTS_ORTOFOTO/WMTService.aspx layers=orto output=ortofoto srs=3857 format=jpeg driver=WMTS_GRASS style=default
Last changed: $Date: 2012-12-28 09:14:22 -0800 (Fri, 28 Dec 2012) $
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