How To Guides for TCP/IP

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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. back to top

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 back to top

Domain Information Groper

Grope for domain information with DIG

dig hostname

Last updated Monday November 13, 2006

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How To Guides for TCP/IP

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