RFC 7489, "Domain-based Message Authentication, Reporting, and Conformance (DMARC)", March 2015

Note: This RFC has been updated by RFC 8553, RFC 8616

Errata ID: 7865
Status: Reported
Type: Technical
Publication Format(s) : TEXT
Reported By: Fränz Friederes
Date Reported: 2024-03-23

Appendix C says:

<!-- Credit to Roger L. Costello for IPv4 regex
    http://mailman.ic.ac.uk/pipermail/xml-dev/1999-December/
          018018.html -->
<!-- Credit to java2s.com for IPv6 regex
    http://www.java2s.com/Code/XML/XML-Schema/
          IPv6addressesareeasiertodescribeusingasimpleregex.htm -->
<xs:simpleType name="IPAddress">
  <xs:restriction base="xs:string">
    <xs:pattern value="((1?[0-9]?[0-9]|2[0-4][0-9]|25[0-5]).){3}
                (1?[0-9]?[0-9]|2[0-4][0-9]|25[0-5])|
                ([A-Fa-f0-9]{1,4}:){7}[A-Fa-f0-9]{1,4}"/>
  </xs:restriction>
</xs:simpleType>

It should say:

<!-- Credit to Roger L. Costello for IPv4 regex
    http://mailman.ic.ac.uk/pipermail/xml-dev/1999-December/
          018050.html -->
<!-- Credit to java2s.com for IPv6 regex
    http://www.java2s.com/Code/XML/XML-Schema/
          IPv6addressesareeasiertodescribeusingasimpleregex.htm -->
<xs:simpleType name="IPAddress">
  <xs:restriction base="xs:string">
    <xs:pattern value="((1?[0-9]?[0-9]|2[0-4][0-9]|25[0-5])\.){3}
                (1?[0-9]?[0-9]|2[0-4][0-9]|25[0-5])|
                ([A-Fa-f0-9]{1,4}:){7}[A-Fa-f0-9]{1,4}"/>
  </xs:restriction>
</xs:simpleType>

Notes:

The IPv4 regex contains a period "." that should be corrected to an escaped period "\." As stated in the follow up message of the one referenced in the IPv4 regex credit: "I just realized that there is a bug [...] The period (.) is a special character meaning 'any character'. To indicate that we want a period and not 'any character' the period must be escaped with a backslash, i.e., \." Following the XML schema provided in the original Appendix C, strings like "1a1a1a1" and "1111111" are considered valid IPv4 addresses, although they are not usable.

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