Saturday, July 3, 2010

How to Find your DNS Servers

The easiest way to find your DNS servers is by using the `nslookup` tool.

  • Start nslookup
  • Set your search type to NS -- this tells nslookup to search for nameservers
  • Finally, enter in the domain name for which you would like to find the nameservers
Here are some example searches for the most popular lookups:

Finding the Lincsat DNS Servers

$ nslookup
> set type=ns
> lincsat.com
Server: 66.37.143.12
Address: 66.37.143.12#53

Non-authoritative answer:
lincsat.com nameserver = ns2.anywarenetworks.com.
lincsat.com nameserver = ns1.anywarenetworks.com.

Authoritative answers can be found from:

Finding the MCI DNS Servers

$ nslookup
> set type=ns
> mci.com
Server: 66.37.143.12
Address: 66.37.143.12#53

Non-authoritative answer:
mci.com nameserver = auth61.ns.uu.net.
mci.com nameserver = auth300.ns.uu.net.
mci.com nameserver = auth310.ns.uu.net.
mci.com nameserver = DNS1.mci.com.
mci.com nameserver = DNS2.mci.com.
mci.com nameserver = DNS3.mci.com.
mci.com nameserver = DNS4.mci.com.
mci.com nameserver = auth01.ns.uu.net.
mci.com nameserver = auth50.ns.uu.net.

Authoritative answers can be found from:
DNS3.mci.com internet address = 199.249.19.2
DNS4.mci.com internet address = 199.249.18.2

Finding the Shaw Cable DNS Servers

$ nslookup
> set type=ns
> shaw.ca
Server: 66.37.143.12
Address: 66.37.143.12#53

Non-authoritative answer:
shaw.ca nameserver = ns10sc.cg.shawcable.net.
shaw.ca nameserver = ns7.no.cg.shawcable.net.

Authoritative answers can be found from:
ns10sc.cg.shawcable.net internet address = 204.209.208.51

Finding the Comcast DNS Servers

$ nslookup
> set type=ns
> comcast.net
Server: 66.37.143.12
Address: 66.37.143.12#53

Non-authoritative answer:
comcast.net nameserver = dns02.jdc01.pa.comcast.net.
comcast.net nameserver = adns.cmc.comcast.net.
comcast.net nameserver = dns01.jdc01.pa.comcast.net.

Authoritative answers can be found from:
dns01.jdc01.pa.comcast.net internet address = 68.87.96.3
dns02.jdc01.pa.comcast.net internet address = 68.87.96.4

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