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RFC 3986, "Uniform Resource Identifier (URI): Generic Syntax", January 2005

Note: This RFC has been updated by RFC 6874, RFC 7320, RFC 8820

Source of RFC: IETF - NON WORKING GROUP
Area Assignment: app

Errata ID: 4942
Status: Reported
Type: Technical
Publication Format(s) : TEXT
Reported By: r. de raat
Date Reported: 2017-02-19

Section 3.2.2. Host says: 

Such a name consists of a sequence of domain labels separated by ".",
each domain label starting and ending with an alphanumeric character
and possibly also containing "-" characters.  The rightmost domain
label of a fully qualified domain name in DNS may be followed by a
single "." and should be if it is necessary to distinguish between
the complete domain name and some local domain.

   reg-name    = *( unreserved / pct-encoded / sub-delims )

If the URI scheme defines a default for host, then that default

It should say:

Such a name consists of a sequence of domain labels separated by ".",
each domain label starting and ending with an alphanumeric character
and possibly also containing "-" characters.  The rightmost domain
label of a fully qualified domain name in DNS may be followed by a
single "." and should be if it is necessary to distinguish between
the complete domain name and some local domain.

   reg-name    = *( unreserved / pct-encoded / "-" / ".")

If the URI scheme defines a default for host, then that default

Notes:

sub-delims are defined as "!" / "$" / "&" / "'" / "(" / ")" / "*" / "+" / "," / ";" / "=" these are not characters that are allowed in host, domain or tld names, in addition the sub-delims do not sontain the "-" and "."
therefore the reg-name (fully qualified domain name) definition is incorrect

The same issue appears in "Appendix A."

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