Queries for host command

[ashish.sachan at gmail.com]

Dear All,
I am new to DNS and trying the command , but getting following error,
# host www.linuxhomenetworking.com
;; connection timed out; no servers could be reached
# host 65.115.71.34
;; connection timed out; no servers could be reached

I am behind my institute's proxy ( 172.18.10.1 ) .....
what should i do to run host command.....

Pls help..

Regards,
-Ashish