The IPs look OK.
Please kindly check this part of our avast FAQ: http://www.avast.com/i_kat_81.html#idt_1366 .

The reason you’re seeing confusing web pages is that asw.cz and iavs.cz are actually web-hosted servers (not our own servers) - i.e. ‘virtual servers’. That means that you need to use the DNS names to get to the appropriate avast pages, as these are not located in the root directory on these servers. If you only use the IP addresses, you’re getting the contents of the root instead of the avast directory on that server…

Vlk