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read the transcript!
your domain has dns records
example.com A 1.2.3.4 300
example.com is the name
A is the type of record
1.2.3.4 is the value
300 is the TTL
these records are cached on lots of servers
server 8.8.8.8, thinking: I was told example.com’s IP is 1.2.3.4
but when that cache expires…
the only source of truth is your authoritative nameserver
your nameserver: I have all example.com’s DNS records!
how to get a domain’s authoritative nameserver: ask its TLD namesever
person: who’s the authority for example.com?
.com nameserver: b.iana-servers.net
here’s how to look up example.com’s nameserver
Run this:
$ dig ns example.com
g.gtld-servers.net
g.gtld-servers.net is one of the .com nameservers
you can update your nameserver on your registrar’s website
person: hey I want to use a different nameserver
registrar: I’ll tell the TLD nameservers!