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Creates and returns a new InternetDomainName by prepending the argument and a dot to
the current name.
Returns an InternetDomainName that is the immediate ancestor of this one; that is, the
current domain with the leftmost part removed.
Returns the
public suffix portion of the domain name, or
null if no public suffix is present.
Returns the
registry suffix portion of the domain name, or
null if no registry suffix is present.
Returns the portion of this domain name that is one level beneath the
registry suffix.
Returns the portion of this domain name that is one level beneath the
public suffix.