188.8.131.52/17 is listed on the Spamhaus Block List - SBL
2013-11-24 15:07:16 GMT | di-net.ru
Snowshoe spam operation: Relativity Digital Solutions
Passive DNS for 184.108.40.206_17
Records found: 14174
I use this subdomain as herbsmoka said, it is free for usage via http://afraid.org
I have 2 of these subdomains (http://biohostinguk.uk.to) and (http://hazzardradio.uk.to) and It is completely fine.
It maybe because some people make sites using these subdomains that are bad and are pretty much useless but there are others that are great.