Gem in a Box
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public_suffix (3.0.0 - 4.0.6)
gem install public_suffix -v "4.0.6"gem install public_suffix -v "4.0.3"gem install public_suffix -v "4.0.1"gem install public_suffix -v "3.0.3"gem install public_suffix -v "3.0.1"gem install public_suffix -v "3.0.0"PublicSuffix can parse and decompose a domain name into top level domain, domain and subdomains.