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Maysora/cname_check.rb

Created December 5, 2016 09:06
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Ruby DNS CNAME check
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cname_check.rb
require 'resolv'
url = 'mail.bocistudio.com'
begin
r = Resolv::DNS.open do |dns|
dns.getresource(url, Resolv::DNS::Resource::IN::CNAME)
end
r.name.to_s # => return alias domain
rescue Resolv::ResolvError => e
# handle error
end
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