Package publicsuffix provides a public suffix list based on data from http://publicsuffix.org/. A public suffix is one under which Internet users can directly register names.
List implements the cookiejar.PublicSuffixList interface by calling the PublicSuffix function.
EffectiveTLDPlusOne returns the effective top level domain plus one more label. For example, the eTLD+1 for "foo.bar.golang.org" is "golang.org".
PublicSuffix returns the public suffix of the domain using a copy of the publicsuffix.org database compiled into the library.
icann is whether the public suffix is managed by the Internet Corporation for Assigned Names and Numbers. If not, the public suffix is privately managed. For example, foo.org and foo.co.uk are ICANN domains, foo.dyndns.org and foo.blogspot.co.uk are private domains.
Use cases for distinguishing ICANN domains like foo.com from private domains like foo.appspot.com can be found at https://wiki.mozilla.org/Public_Suffix_List/Use_Cases