@LOOKUPHOST — Returns an address for a hostname.

Syntax:
%@LOOKUPHOST[n,hostname]

nwhat to return:
    0: try IPv4 first, then IPv6
    4: IPv4 only
    6: IPv6 only
    10: try IPv6 first, then IPv4
    128: return the canonical name (CNAME record)
hostnamethe name to look up; required

If n is not given, it defaults to 0 (try IPv4 first).