server=2001:4860:4860::8888
server=2001:4860:4860::8844

administrator@server:~$ nslookup google.com
;; connection timed out; no servers could be reached

administrator@server:~$ nslookup google.com 2001:4860:4860::8888
;; connection timed out; no servers could be reached

administrator@server-01:~$ dig google.com

; <<>> DiG 9.10.3-P4-Ubuntu <<>> google.com
;; global options: +cmd
;; connection timed out; no servers could be reached

administrator@server-01:~$ dig @2001:4860:4860::8888 google.com

; <<>> DiG 9.10.3-P4-Ubuntu <<>> @2001:4860:4860::8888 google.com
; (1 server found)
;; global options: +cmd
;; connection timed out; no servers could be reached