mozilla/4.0 (compatible; msie 6.0; windows nt 5.0)
83 hits From 6419136165.hostnoc.net 22.214.171.124
The above is one of the suspected useragents that always turnes out to be a robot and not a browser. A search of google shows a lot of abuse from this domain so its banned.
domain ban list
hostnoc.net,pro spam host