How To Guides for TCP/IP

TSO commands to look up DNS information

Name Server Lookup

nslookup
>

Determine the authoritative name servers for a name

​> set q=ns
​> name​

Change to the authoritative name server

​> server newns​

Look up the IP address for a name

​> set q=a
​> name​

Look up the name for an IP address

​> set q=ptr
​> ipaddr​
nslookup hostname​
nslookup
​EZB3042I > ls domain.com​
​EZB3042I > set q=ns
​EZB3042I > ​hostname​
​EZB3112I Authoritative answers can be found from:​
​EZB3143I  ns1.domain.com internet address = nnn.nnn.nnn.nnn ​
​EZB3143I  ns2.domain.com internet address = nnn.nnn.nnn.nnn ​
​EZB3042I > server ns1.domain.com​
​EZB3042I > set q=a
​EZB3042I > ​hostname​
​EZB3042I > set q=ptr
​EZB3042I > ​ipaddr​

ls lists all of the names in the given domain. set q=ns sets the query type to allow determining the authoritative name server for a given host name. server can be used to set the default server being queried to an authoritative name server, or any other name server. set q=a sets the query type to return the IP address for a given host name. set q=ptr sets the query type to do a reverse lookup, which returns the host name for a given IP addrses.

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