Should ns servers resolve?

Question

Network administration

There is domain1.com. Registered with Godaddy. They have the ability to prescribe host names in the format host - ip address, as I understand it, specifically for the case of using ns1.domain1.com and ns2.domain1.com. ns1 - 1.1.1.1 (first server IP), ns2 - 2.2.2.2 (second server IP) are registered. They have been registered for a week already, but they still do not open and a request to them does not return any IP address - neither the first nor the second. Is that right?
When I register ns1.domain1.com and ns2.domain1.com for domain2.com, it does not open. https://intodns.com/ swears in red on ns1 and ns2 that no response has been received.
When I prescribe the usual A records for domain1.com for ns1 and ns2, then domain2.com starts working.
What could be the problem? Godaddy didn't send the hostname data for ns1 and ns2 to the upstream registrar?

Answer 1

And at the same time, you have a DNS server configured on your server, and there is a zone for this domain, just in case? =)
Using the NS server name/ip pair at the registrar allows you to solve the chicken and egg problem when NS servers are assigned in the domain itself, for example, ns1.domain.tld for domain.tld, i.e. you understand correctly.
Further, they must also resolve within the domain - for them there must be NS, _I_ A records in the zone.
The simplest zone, with its internal NS, looks something like this (except for SOA):

domain.tld.  NS ns1.domain.tld.
domain.tld.  NS ns2.domain.tld.

ns1.domain.tld. A 1.1.1.1
ns2.domain.tld.  A 2.2.2.2

domain.tld. A 3.3.3.3

Answer 2

A entry specifies a name->address match.
Those. you must specify which addresses correspond to your ns servers.
The entry
domain1.com IN NS ns1.domain.com
indicates that the NS server for this domain is the server named ns1.domain.com