def check_obfuscated_ip (self):
        """Warn if host of this URL is obfuscated IP address."""
        # check if self.host can be an IP address
        # check for obfuscated IP address
        if iputil.is_obfuscated_ip(self.host):
            ips = iputil.resolve_host(self.host)
            if ips:
                self.host = ips[0]
                self.add_warning(
                   _("URL %(url)s has obfuscated IP address %(ip)s") % \
                   {"url": self.base_url, "ip": ips[0]},
                          tag=WARN_URL_OBFUSCATED_IP)
Warn if host of this URL is obfuscated IP address.