Is there a limit to the number of CNAME records a DNS can handle? Is it bad practice to have many (100s) of CNAME records? - Quora https://www.quora.com/Is-there-a-limit-to-the-number-of-CNAME-records-a-DNS-can-handle-Is-it-bad-practice-to-have-many-100s-of-CNAME-records
BIND9のco-authorが答えてるのつよすぎる