“Test DNS servers and settings for a domain name.”
To query for SOA records, one of these commands should do:
host -t soa example.com
returns the SOA record.
dig soa example.com
adds the SOA record to the normal dig output.
For nslookup, I don’t think we can make an SOA query directly from the command line. Starting an interactive nslookup session, we can use:
$ nslookup
> set q=soa
> example.com
This returns a parsed and labeled version of the SOA record as well as a listing of all the servers in the NS record and the resolved IP addresses of up to 4 of those name servers.
For more nslookup options, see [Using NSLOOKUP |
The Domain Name System | InformIT](http://www.informit.com/articles/article.aspx?p=130901&seqNum=8). |
dig example.com +nssearch
lists the SOA records on each NS in the zone. These SOA records should all be identical.
See also: Find the DNS Authority Record for a DNS Domain (SOA)