"DNS is the Internet's phone book"

This ceased to be a useful analogy many, many years ago!

I've just read the Internet Society's new paper on DNS blocking, aimed at lawyers.

https://www.internetsociety.org/wp-content/uploads/2026/03/Mandated-DNS-Blocking-Full-Paper.pdf

It is a reasonable primer for anyone new to this area, but probably still pretty hard going if you are not at familiar with this stuff.

It has no discussion of different types of record, which I found odd in a DNS primer, meaning that this sentence irked me:

> DNS resolution only translates a domain name to the IP address of a web server

@neil without reading the paper and unbound source, is there a DNS equivalent of http status 451? Ie a way of signalling back to the client you're not getting the real answer becase $legal_reasons?
@Elwell Short of a DNSSEC failure, not as far as I am aware.
DNS Return Codes: Explained

Learn what DNS return codes are, what they mean, and how to troubleshoot common issues in this complete guide to DNS return codes.

Control D Blog