! Could not resolve domain "z6.com" to an IP address.
| (whois) | 
| | shell:$ nslookup -timeout=2 -retry=1 'z6.com'
;; communications error to 75.98.161.224#53: timed out
;; Got SERVFAIL reply from 69.39.86.5
Server:		69.39.86.5
Address:	69.39.86.5#53
** server can't find z6.com: SERVFAIL
 | 
 |