I used both 8.8.8.8 and 8.8.4.4 from google. For example:
Code:
PROMPT> nslookup ftp.usa.opensbsd.org 8.8.8.8
Server: 8.8.8.8
Address: 8.8.8.8#53
** server can't find ftp.usa.opensbsd.org: NXDOMAIN
PROMPT> dig @8.8.8.8 ftp.usa.opensbsd.org
; <<>> DiG 9.4-ESV-R5 <<>> @8.8.8.8 ftp.usa.opensbsd.org
; (1 server found)
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 58576
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; QUESTION SECTION:
;ftp.usa.opensbsd.org. IN A
;; AUTHORITY SECTION:
org. 822 IN SOA a0.org.afilias-nst.info. noc.afilias-nst.info. 2009753663 1800 900 604800 86400
;; Query time: 72 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Mon Aug 29 11:43:15 2011
;; MSG SIZE rcvd: 101