We can check all available NS records for a domain using the option -type=any
You could run the command:
nslookup -type=ns hostonnet.com (hostonnet.com can be replace with your domain name)
annie@annie-Vostro-3558:~$ nslookup -type=ns hostonnet.com Server: 127.0.1.1 Address: 127.0.1.1#53 Non-authoritative answer: hostonnet.com nameserver = carl.ns.cloudflare.com. hostonnet.com nameserver = elle.ns.cloudflare.com. Authoritative answers can be found from: annie@annie-Vostro-3558:~$