The most part of WHOIS servers follow the "convention" to include the name server list of a domain in the WHOIS record.
A name server is represented by a DNS name, which is a string.
The DNS name resolves to an IPv4 IP address.
ns1.google.com => 18.104.22.168 ns2.google.com => 22.214.171.124
Optionally, the DNS name can resolve to an IPv6 IP address.git
ns1.nic.fr => 2001:660:3003:2::4:1 ns2.nic.fr => 2001:660:3005:1::1:2
Each WHOIS server arbitrary choses the amount of information to store and return in a WHOIS record. Some registries returns only the DNS name, other registries include IP addresses as well.
In the current WHOIS version, the list of name servers is accessible through the
r = Whois.query "google.com" r.nameservers # => ["ns1.google.com", "ns2.google.com"]
The method returns an
String. This is a lossy implementation because it completely ignores the IPv4 and IPv6 details.
The new Whois version solves this problem by introducing a new
Whois::Answer::Nameserver object. This object is a
Struct composed by three attributes:
ns = Nameserver.new( :name => "ns1.nic.fr", :ipv4 => "126.96.36.199", :ipv6 => "2001:660:3003:2::4:1" ) ns.name # => "ns1.nic.fr" ns.ipv4 # => "188.8.131.52" ns.ipv6 # => "2001:660:3003:2::4:1"
In the new Whois version, the
#nameservers implementation has been changed to return an array of
Nameserver instead of a simple
r = Whois.query "nic.fr" r.nameservers # => [ # #<struct Whois::Answer::Nameserver name="ns1.nic.fr", ipv4="184.108.40.206", ipv6="2001:660:3003:2::4:1">, # #<struct Whois::Answer::Nameserver name="ns2.nic.fr", ipv4="220.127.116.11", ipv6="2001:660:3005:1::1:2">, # ... # ]
It's important to know that this change can break backwards compatibility. In order to minimize the impact,
Nameserver#to_s returns the
String value of the
Nameserver.new(:name => "ns1.nic.fr", :ipv4 => "18.104.22.168").to_s # => "ns1.nic.fr"