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DNS Quick Setup

DNS Introduction Tldr​

DNS is a table that provides mapping from Domain Name to IP Address.

DNS table contains multiple Types, like Type A and Type CNAME. More on these in next section.

Domain Name entries are split by Prefixes.

Plain Prefix: @
Plain Prefix is Domain without Prefix, eg: mywebsite.com

ALL Other Prefix: *
Covers all other prefixes, including www in www.mywebsite.com

Type A Requirements​

Type A maps Domain Name to a specific IP Address

Retrieve IP Address for GitHub Pages from: https://docs.github.com/en/pages/configuring-a-custom-domain-for-your-github-pages-site/managing-a-custom-domain-for-your-github-pages-site

Need to have Type A Entries:

  • Plain Prefix @
    Covers: mywebsite.com
  • ALL Other Prefix: *
    Covers other prefixes, including: www.mywebsite.com

Type CNAME Requirements​

Type CNAME maps Domain Name to Type A entry

  • Www Prefix: www
    Covers: www.mywebsite.com

Note: It seems CNAME only supports prefix www. Note: It also seems that CNAME is a superset of Type A, so it's not clear what CNAME purpose is. Redundant?

Reference​

GitHub Pages IP Address:
https://docs.github.com/en/pages/configuring-a-custom-domain-for-your-github-pages-site/managing-a-custom-domain-for-your-github-pages-site