Well, this request is quite a while ago :-) I would love this feature, and woud be even willing to implement it. Would you accept (or let's say: check) a patch? Suggestion: Currently, mod_qos seems to "accept" something like "1.2.3.4/27", but it "ignores" it. As people might enter it like this, because they don't read the manual: I guess that reporting an error when somebody specifies a netmask might help.