Hello NANOG, I work for a medium-sized ISP with our own ARIN assignments (several /18 and /19 netblocks) and I've got a question about a possibly dubious customer request. I know a lot of you have experience on a much grander scale than myself, so I'm looking for some good advice. We have a customer who, over the years, has amassed several small subnet assignments from us for their colo. They are an email marketer. They have requested these assignments in as many discontiguous netblocks as we can manage. They are now asking for more addresses (a /24s worth) in even more discontiguous blocks. What I'd like to know is whether there is a legitimate use for so many addresses in discontiguous networks besides spam? I am trying my best to give them the benefit of the doubt here, because they do work directly with Spamhaus to not be listed (I realize reasons on both sides why this could be) and searches on Google and spam newsgroups for their highest traffic email domains yield next to nothing, given the amount of email they say they send out. I strongly believe that their given justification for so many addresses is not a good one (many addresses on an MTA, off-chance one gets blocked, etc), especially now that IPv4 addresses are becoming more of a scarce resource. However, if they *are* legitimate, which certainly is possible, are discontiguous networks a common practice for even legit operators, as it's quite likely that even legit email marketers will end up being blocked because someone accidentally hit 'Spam' instead of 'Delete' in their AOL software? Thanks, steve Note: I hate spammers as much as anyone out there, but I *do* know that not everyone who sends out massive amounts of email is a spammer. While it's possible they don't deserve it, I'm trying to give my customer the benefit of the doubt.