1234689abcdefghiklmnopqrstuvwxyz
c1.ucalgary.ca
c64.rulez.org
ca.r-and-k.com
camelot.spsl.nsc.ru
candc1.golden.net
catless.ncl.ac.uk
ccrma-ftp.stanford.edu
checksoftware.com
chost.neolabs.kz
clr.nmsu.edu
coast.cs.purdue.edu
compactus.tip.csiro.au
coombs.anu.edu.au
cottbus.gefoekom.org
crydee.sai.msu.ru
cs.nyu.edu
cs.ucl.ac.uk
csus.edu
cui.unige.ch