[AusNOG] Are domain name server pointers reliant on registrar name server?

[Matt Selbst]

Hi All,

Just a quick question. Say I have a domain mydomain.com who's authoritative
name servers are ns1.server.net and ns2.server.net

Are these name server entries for my domain stored by my registrar or are
they stored somewhere upstream and merely updated by my registrar?

Putting it another way am I reliant on my registrar's name serves being
available (if these name aren't run by them).

Thanks

-Matt
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