RPZ zone name label length limit

Jim Yang zy33 at cornell.edu
Thu Jun 29 13:57:16 UTC 2017


What is the DNS name label length limit? As per RFC 1035, it is 63 characters.  I tested a few DNS names that contains a label that is longer than 63 characters, and found that these records were successfully loaded in RPZ zone. I wonder if this is a BIND RPZ feature or bug (it allows DNS name label that is longer than 63 characters)?

When I dig these DNS records using, which reports them as ‘NXDOMAIN’.

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