Judgment Rules for Conflicting Resolution Records

Last Updated: May 27, 2016

NS CNAME A URL MX TXT AAAA SRV
NS Repeatable X X X X X X X
CNAME X X X X X X X X
A X X Repeatable X Unrestricted Unrestricted Unrestricted Unrestricted
URL X X X X Unrestricted Unrestricted X Unrestricted
MX X X Unrestricted Unrestricted Repeatable Unrestricted Unrestricted Unrestricted
TXT X X Unrestricted Unrestricted Unrestricted Repeatable Unrestricted Unrestricted
AAAA X X Unrestricted X Unrestricted Unrestricted Repeatable Unrestricted
SRV X X Unrestricted Unrestricted Unrestricted Unrestricted Unrestricted Repeatable

Several different types of resolutions with the same RR value and line may not coexist (X indicates not permitted):

  • X: Resolution records of different types with the same RR value and line may not coexist. For example: A user who has set an A record for www.example.com may not set a CNAME record for www.example.com.
  • Unrestricted: Resolution records of different types with the same RR value and line may coexist. For example: A user who has set an A record for www.example.com is also allowed to set an MX record for www.example.com.
  • Repeatable: This indicates that multiple identical RR value records can be set under the same type and line. For example: A user who has set an A record for www.example.com is also allowed to set another A record for www.example.com.
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