Print info about a zone's name servers
nsinfo
For a given DNS zone, print out some information about its authoritative nameservers, specifically nameserver name, IP address, ASN originating prefix covering the IP address, and reverse mapping of IP address to name.
Author: Shumon Huque shuque@gmail.com
Example runs:
$ nsinfo complex.com
ns1.complex.com. 2606:2800:3::5 AS[15133] ns1.edgecastdns.net.
ns1.complex.com. 192.16.16.5 AS[15133] ns1.edgecastdns.net.
ns2.complex.com. 2606:2800:3::6 AS[15133] ns2.edgecastdns.net.
ns2.complex.com. 192.16.16.6 AS[15133] ns2.edgecastdns.net.
ns3.complex.com. 2606:2800:c::5 AS[15133] ns3.edgecastdns.net.
ns3.complex.com. 198.7.29.5 AS[15133] ns3.edgecastdns.net.
ns4.complex.com. 2606:2800:c::6 AS[15133] ns4.edgecastdns.net.
ns4.complex.com. 198.7.29.6 AS[15133] ns4.edgecastdns.net.
$ nsinfo upenn.edu
adns1.upenn.edu. 2607:f470:1001::1:a AS[55] adns1.upenn.edu.
adns1.upenn.edu. 128.91.3.128 AS[55] adns1.upenn.edu.
adns2.upenn.edu. 2607:f470:1002::2:3 AS[55] adns2.upenn.edu.
adns2.upenn.edu. 128.91.254.22 AS[55] adns2.upenn.edu.
adns3.upenn.edu. 2607:f470:1003::3:c AS[55] adns3.upenn.edu.
adns3.upenn.edu. 128.91.251.33 AS[55] adns3.upenn.edu.
dns1.udel.edu. 128.175.13.16 AS[34] dns1.udel.edu.
dns2.udel.edu. 128.175.13.17 AS[34] dns2.udel.edu.
sns-pb.isc.org. 2001:500:2e::1 AS[3557] sns-pb.isc.org.
sns-pb.isc.org. 192.5.4.1 AS[3557] sns-pb.isc.org.
$ nsinfo com
a.gtld-servers.net. 2001:503:a83e::2:30 AS[36622] a.gtld-servers.net.
a.gtld-servers.net. 192.5.6.30 AS[36617 36619 36620 36625] a.gtld-servers.net.
b.gtld-servers.net. 2001:503:231d::2:30 AS[26415] b.gtld-servers.net.
b.gtld-servers.net. 192.33.14.30 AS[26415] b.gtld-servers.net.
c.gtld-servers.net. 192.26.92.30 AS[36617 36619 36620 36625] c.gtld-servers.net.
d.gtld-servers.net. 192.31.80.30 AS[36617 36619 36620 36625] d.gtld-servers.net.
e.gtld-servers.net. 192.12.94.30 AS[36618 36622 36624 36628] e.gtld-servers.net.
f.gtld-servers.net. 192.35.51.30 AS[36618 36622 36624 36628] f.gtld-servers.net.
g.gtld-servers.net. 192.42.93.30 AS[36618 36622 36624 36628] g.gtld-servers.net.
h.gtld-servers.net. 192.54.112.30 AS[36621 36623 36632] h.gtld-servers.net.
i.gtld-servers.net. 192.43.172.30 AS[36621 36623 36632] i.gtld-servers.net.
j.gtld-servers.net. 192.48.79.30 AS[36621 36623 36632] j.gtld-servers.net.
k.gtld-servers.net. 192.52.178.30 AS[36631] k.gtld-servers.net.
l.gtld-servers.net. 192.41.162.30 AS[36619] l.gtld-servers.net.
m.gtld-servers.net. 192.55.83.30 AS[36627] m.gtld-servers.net.