It took just two grouchy hacker guys to get the DC-stuff list turned off . That's why it is against the law to just nuke ISPs and Web servers you don't like. Believe me, as you will soon find out, it is really easy to blow an Internet host off the Internet. Trying to throw Web kiddie porn guys in jail doesn't always work. While there are laws against it in the US, the problem is that the Internet is global.
Many countries have no laws against kiddie porn on the Internet.
Even if it were illegal everywhere, in lots of countries the police only bust people in exchange for you paying a bigger bribe than the criminal pays. If the imagery is hosted on a physical storage device within the jurisdiction of a country with laws against it, the person who puts this imagery on the storage device can go to jail. So if you know enough to help the authorities get a search warrant, by all means contact them. In fact, most human beings are so disgusted at kiddie porn that they will jump at the chance to shut it down. But please keep in mind that I am not saying this actually is a web address with kiddie porn.