nic.xerox IN A 13.13.57.32 nic.xerox IN NS a.nic.xerox nic.xerox IN NS b.nic.xerox nic.xerox IN NS c.nic.xerox nic.xerox IN NS x.nic.xerox nic.xerox IN NS y.nic.xerox nic.xerox IN NS z.nic.xerox