By trying to find "list of IP addresses bound to a url", I assume you are trying to enumerate the DNS entries of a domain. Then try dnsdict6
. Of course, there are various other tools too, but I prefer this one.
It is a command line tool which lists all the subdomains or DNS entries of a any domain name provided. It can also take a dictionary file as input and also display both IPv4 and IPv6 addresses of the domain.