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How To Guides for TCP/IP Summary Conn. Tests DNS Lookups

How To Guides for TCP/IP

Look up DNS Information Commands to look up DNS information. TCP/IP

TSO commands to look up DNS information

These commands can be executed directly in the TSO environment or with the TSO interfaces of the ISPF environment.

Name Server Lookup

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.

Domain Information Groper

Grope for domain information with DIG

dig hostname​ Monday November 13, 2006
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