Default nameservers are listed below with your registrar, and then host the domain on a third-party site.
# If your domain is registered with Namecheap, use the following nameservers:
dns1.registrar-servers.com
dns2.registrar-servers.com
# If your domain is registered with Liquid, use the following nameservers:
ns1.liqu.id
ns2.liqu.id
# If your domain is registered with PDR, use the following nameservers:
domainloin.mars.orderbox-dns.com
domainloin.earth.orderbox-dns.com
domainloin.venus.orderbox-dns.com
domainloin.mercury.orderbox-dns.com
# If your domain is registered with Cosmotown use the following nameservers:
ns1.cosmotown.com
ns2.cosmotown.com
ns3.cosmotown.com
ns4.cosmotown.com
You can check the domain registrar's name here: https://whois.com/
