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whatsmydns.net lets you instantly perform a DNS lookup to check a domain names current IP address and DNS record information against multiple name servers located in different parts of the world. This allows you to check the current state of DNS propagation after having made changes to your domains records.
The named man page (man named) lists two options for supporting IPv4 or IPv6. Each of these commands are mutually exclusive, meaning using one of the options will not allow you to use the other. Either IPv4 or iPv6, not both. Now the default is to use both, so if you want to continue supporting lookups on IPv4 and IPv6 there is nothing more you need to do. If you want to *only* use one or the other you can use the -4 or -6 options in the configuration.