I can't do this through the command line though I can do it in arin, say - use a regexp and find a full list of netblocks allocated to a spammer For example there's a brazilian spammer with multiple sbl listings, who has lots of /27s and /28s swipped to him all over multiple /16s on an European ISP Finding him by command line whois doesn't work at all, but I can get all his netblocks by searching in https://apps.db.ripe.net/search/full-text.html -- Suresh Ramasubramanian (ops.lists@gmail.com)