Thank you for reaching out.
The Name servers (ns1-05.azure-dns.com) are assigned at random by Azure DNS.
If you wish to pin your Name servers to a specific set like
ns1-3.azure-dns.com etc. you will need to create a support ticket with us as a support engineer can create a formal request internally to update the Name Servers.
If you have a support plan you can file a support ticket. If you do not have a support plan, please let me know.
Hope this helps!
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