On Fri, 28 Mar 2008 at 13:40 +0100, mrshunz@??? confabulated:
> Hi,
>
>> Hi my servers are getting spam from the ip's below (rbl's are not
>> catching them) how can I block the whole ip ranges that these ip's
>> belong to ? How do I figure out the netmask / Mask Bits .. All the
>> calculators I have found so far only work for class A,B and C networks ..
>
> you can use simply "whois"
>
> #whois 67.205.81.186
>
> returns:
>
> Groupe iWeb Technologies inc. IWEBGROUP (NET-67-205-64-0-1)
> 67.205.64.0 - 67.205.95.255
> K T Tran BODHOST-COM-CL-T039-480CN (NET-67-205-81-184-1)
> 67.205.81.184 - 67.205.81.191
>
> # ARIN WHOIS database, last updated 2008-03-27 19:10
> # Enter ? for additional hints on searching ARIN's WHOIS database.
>
> so use a calculator to find that it's 67.205.81.184/29
You can also find that out without a calculator by looking at the net
name:
%whois -a NET-67-205-81-184-1
...
NetRange: 67.205.81.184 - 67.205.81.191
CIDR: 67.205.81.184/29
...
-d
