How to determine delegated authoritative DNS servers for the particular zone?

Created:

2017-05-24 04:12:47 UTC

Modified:

2017-08-16 17:21:32 UTC

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How to determine delegated authoritative DNS servers for the particular zone?

Applicable to:

  • Plesk for Windows
  • Plesk for Linux

Question

How to determine delegated authoritative DNS servers for the particular zone example.com.?

Answer

Perform the following actions:

  • Determine which DNS servers are authoritative for the parent com. zone:

For Linux:

# dig ns com.
;; QUESTION SECTION:
;com. IN NS
;; ANSWER SECTION:
com. 20189 IN NS d.gtld-servers.net.
com. 20189 IN NS e.gtld-servers.net.
com. 20189 IN NS a.gtld-servers.net.
com. 20189 IN NS k.gtld-servers.net.
com. 20189 IN NS m.gtld-servers.net.
com. 20189 IN NS b.gtld-servers.net.
com. 20189 IN NS l.gtld-servers.net.
com. 20189 IN NS f.gtld-servers.net.
com. 20189 IN NS g.gtld-servers.net.
com. 20189 IN NS i.gtld-servers.net.
com. 20189 IN NS j.gtld-servers.net.
com. 20189 IN NS h.gtld-servers.net.
com. 20189 IN NS c.gtld-servers.net.

For Windows:

> nslookup -type=ns com.
Server: google-public-dns-a.google.com.
Address: 8.8.8.8
Non-authoritative answer:
com nameserver = c.gtld-servers.net.
com nameserver = e.gtld-servers.net.
com nameserver = m.gtld-servers.net.
com nameserver = h.gtld-servers.net.
com nameserver = f.gtld-servers.net.
com nameserver = l.gtld-servers.net.
com nameserver = k.gtld-servers.net.
com nameserver = a.gtld-servers.net.
com nameserver = g.gtld-servers.net.
com nameserver = i.gtld-servers.net.
com nameserver = j.gtld-servers.net.
com nameserver = b.gtld-servers.net.
com nameserver = d.gtld-servers.net.
  • Use one of root DNS servers as a resolver to determine which DNS servers are delegated to be authoritative for the subsidiary example.com. zone:

For Linux:

# dig ns example.com. @j.gtld-servers.net.
;; QUESTION SECTION:
;example.com. IN NS
;; AUTHORITY SECTION:
example.com. 172800 IN NS a.iana-servers.net.
example.com. 172800 IN NS b.iana-servers.net.
;; ADDITIONAL SECTION:
a.iana-servers.net. 172800 IN A 199.43.135.53
a.iana-servers.net. 172800 IN AAAA 2001:500:8f::53
b.iana-servers.net. 172800 IN A 199.43.133.53
b.iana-servers.net. 172800 IN AAAA 2001:500:8d::53

For Windows:

> nslookup -type=ns example.com. j.gtld-servers.net.
Server: j.gtld-servers.net.
Address: 192.48.79.30

example.com nameserver = a.iana-servers.net.
example.com nameserver = b.iana-servers.net.

a.iana-servers.net internet address = 199.43.135.53
a.iana-servers.net AAAA IPv6 address = 2001:500:8f::53
b.iana-servers.net internet address = 199.43.133.53
b.iana-servers.net AAAA IPv6 address = 2001:500:8d::53

According to the command outputs, both of IANA's nameservers a.iana-servers.net. and b.iana-servers.net. are authoritative for example.com. zone.

Note . Refer to the following link to learn more about DNS top-level zone delegation: Delegating a generic top-level domain

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