GetRootDomain returns the root domain of a domain.

GetRootDomains returns a list of unique root domains for a slice of domains.

IsDomainName checks if a string is a valid domain name.

IsHostname checks if the given target is a valid hostname.

IsValidDomain checks if a string is a valid domain name.

ResolveDomain resolves a domain name to an IP address (IPv4 or IPv6).

ResolveDomainWithTimeout resolves a domain name to an IP address (IPv4 or IPv6) with a timeout.