Finding the IP address of a domain

Question

How can I find the IP address of an arbitrary domain? I want to get the IP address from the DNS server.

Answer 1

require 'socket'
IPSocket::getaddress('www.google.com') #=> "74.125.79.147"

Answer 2

Resolv is on a higher level than Socket, so will use more resources. However it has the ability to find all the ip addresses of a domain

require 'resolv'
Resolv.getaddresses("www.ruby-lang.org")

Answer 3

Try going through the shell

domain = "google.com"
`host #{domain}`.match(/(\d{1,3}\.){3}\d{1,3}/).to_s
#=> "74.125.39.99"