Reverse DNS

Provides reverse DNS name lookup. I.e., given an IP address, 1.2.3.4, it tries to find its domain name, happy.town.com.

iex(1)> Host.reverse_lookup(ip: "172.217.5.206")
{:ok, "lax28s10-in-f14.1e100.net"}

iex(2)> Host.reverse_lookup(ip: {172,217,5,206})
{:ok, "lax28s10-in-f14.1e100.net"}

This is useful e.g. in Phoenix, to get the vistor's domain name if it exists:

{:ok, visitor_domain_name} = Host.reverse_lookup(ip: conn.remote_ip)

Installation

The package can be installed by adding host to your list of dependencies in mix.exs:

def deps do
  [
    {:host, "~> 0.1.0"}
  ]
end