You’ve probably seen the news: MySpace has reached an agreement with 49 states to take steps to make their site a safer place for kids. I just have one quick comment.

I think the state governments are attacking this from completely the wrong angle. Governments can put all the pressure they want on MySpace, and as soon as MySpace has adequate controls and age verification, the kids will have moved elsewhere.

Now don’t get me wrong, MySpace certainly has an obligation to do what they can. I’m glad to see them cooperating, especially because they only have a PR incentive to do so. They actually have a disincentive from a business perspective.

The advertisers go to MySpace to reach kids of all ages, so MySpace needs to continue to make it easy for the kids to sign up. But you lose your street cred with the kids when you let the parents in.

Providing parents the controls they want while also giving advertisers the access they demand are objectives that are fundamentally at odds with each other.

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… so I’m going to make the case that you should simply be blocking them en masse. But first, a little background.

Dynamic Addressing by ISPs

Internet Service Providers (ISPs) own blocks of contiguous IP addresses (aka “netblocks”) that they in turn assign to the computers that connect to the Internet through their service. When you sign up for DSL, Cable or even dial-up service and connect your computer to the Internet, the ISP assigns your computer an IP address from within a netblock it owns.

Some ISPs provide static IP services, where your computer keeps the same IP address all the time. But the vast majority of home computers are signed up for less expensive dynamic IP services, where your computer gets a new address each time it connects to the Internet. The address is often different every time you connect. But it’s always from within the same netblock.

This allows the ISP to sign up more customers than IP addresses it owns, kind of like how a bank is allowed to loan out money it doesn’t actually have in the vault. Since only a percentage of the ISP’s customers are connected at any give time, this works fine.

How to tell if an IP is in one of these Netblocks

My personal DSL provider is DSLExtreme. When my home computer connects to the Internet (actually, it’s my router), it’s always assigned an address in the netblock 72.25.123.0/24, which includes a range of IPs from 72.25.123.0 to 72.25.123.255.

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