Little script that you feed a list of trackers and will eliminate the duplicates that point to the same IP addresses and try to group the trackers by domain name.

trackers-resolvs.rb

require 'uri'
require 'resolv'

text = File.open("trackers.txt").read.split(/\n|(\r\n)/)
hosts = text.map{ |uri| [URI(uri).host, uri] }.to_h
resolvs = {}

hosts.each do |h, uri|
  if /\d+\.\d+\.\d+\.\d+/.match(h)
    resolvs[h] = h
  else
    ip = Resolv.getaddress h
    points = resolvs[ip]
    if points.nil? || /\d+\.\d+\.\d+\.\d+/.match(points)
      resolvs[ip] = h
    end
  end
end

ips = []
groups = {}

resolvs.each do |ip, h|
  if ip == h
    ips << hosts[h]
  else
    domain = h.split(/\./)
    domain = domain.size > 2 ? domain[1] : domain[0]
    if groups[domain]. nil?
      groups[domain] = [hosts[h]]
    else
      groups[domain] << hosts[h]
    end
  end
end

groups.each do |group, uris|
  uris.each{ |uri| puts uri }
  puts "\n"
end

ips.each do |ip|
   puts ip
   puts "\n"
end

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