Wow! 6OOK ... this is going to saturate someone's bandwidth. By validate, I'm assuming you just want to ensure the urls are still active. There's a lot of reasons why a url that doesn't resolve right now may resolve 5 minutes from now so there's no real way to do this 100% (but hey, that's the nature of TCP/IP). One way to do it is to look at Parallel::ForkManager - it actually uses this scenario in it's documentation (although, you may want to just do a get instead of a getstore).