Gem in a Box
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public_suffix (4.0.6 - 6.0.2)
gem install public_suffix -v "6.0.2"gem install public_suffix -v "6.0.1"gem install public_suffix -v "5.0.5"gem install public_suffix -v "5.0.4"gem install public_suffix -v "5.0.3"gem install public_suffix -v "5.0.1"gem install public_suffix -v "5.0.0"gem install public_suffix -v "4.0.7"gem install public_suffix -v "4.0.6"PublicSuffix can parse and decompose a domain name into top level domain, domain and subdomains.