[1] .onion - Wikipedia, the free encyclopedia ( ( 版)) http://en.wikipedia.org/wiki/.onion
[2] RFC 7686 - The ".onion" Special-Use Domain Name ( 版) https://tools.ietf.org/html/rfc7686
[3] IETF では >>2 で提案標準となっていますが、 IANA の TLD の一覧には現時点では掲載されていないようです。
In effect, ‘.onion’ will be treated in the same way .local, .localhost, and .example have been dealt with previously—that is, outside the global Domain Name System (DNS). Adding .onion to the Special-Use Domain Names registry will also enable hosts on the Tor network to obtain validated SSL certificates.
[5] Special-Use Domain Names ( 版) http://www.iana.org/assignments/special-use-domain-names/special-use-domain-names.xhtml
[6] Standardize .onion DNS lookup blocking? · Issue #248 · whatwg/fetch ( 版) https://github.com/whatwg/fetch/issues/248
Whenever you see a URL like http://duskgytldkxiuqc6.onion/, that's a Tor Onion service. Just replace .onion with .onion.to or .onion.city or .onion.cab or .onion.direct or any other domain made available by volounteers Tor2web operators
[8] Nima Fatemiさんのツイート: "Firefox has introduced a new preference that blocks onion addresses on DNS level to prevent accidental leak. ⚙👌 https://t.co/islL3Y4ksd" () https://twitter.com/mrphs/status/708548201800982528
[9] 1228457 – Implement RFC 7686 (fail dns for .onion) () https://bugzilla.mozilla.org/show_bug.cgi?id=1228457
[10] 1250696 – .onion names contain their own validator, we should use that () https://bugzilla.mozilla.org/show_bug.cgi?id=1250696
[11] 1129618 – please add .onion to public suffix list () https://bugzilla.mozilla.org/show_bug.cgi?id=1129618
[12] [cabfpub] Ballot .onion ballot () https://cabforum.org/pipermail/public/2015-February/004922.html
[13] Add onion (#386) (sleevi著, ) https://github.com/publicsuffix/list/commit/45a2bf8ef3e22000fbe4bfa5f9252db41d777001
[14] BraveのTorモード、.onion URLに対して通常のDNSクエリを実行するバグ | スラド セキュリティ () https://security.srad.jp/story/21/02/23/041248/