There is already a way... go to the Admin section, Select <font color=blue>Database Manager</font color=blue>, then choose <font color=blue>SQL Command</font color=blue>, and enter something like:

select B_Username,B_IP from w3t_Posts where B_IP like '204.201.%' or

select B_Username,B_IP from w3t_Posts where B_IP = '204.201.23.16' or

select B_Username,B_IP from w3t_Posts where B_IP like '%.204.201.%'
etc... then execute the query... maybe more manual than you want, but it is right there for you...
Matt