You want to know if the approved/blocked list feature of WFBS can recognize wildcard characters used in IP addresses.
Wildcards are supported and can be used when adding IP addresses to the approved list or blocked list
For example, the entry "http://61.220*" gives the following result in the TMProxy.log:
<TmpeURLf> Scan URL: "http://61.220.XXX.XX/" - UrlFilterEngine.cpp(228)
<TmpeURLf> Whitelist matched - UrlFilterEngine.cpp(277)