Glue Records are special entries in the domain registry that contain the IP addresses of NS servers. They're required when NS servers are in the same zone as the domain itself.
The Problem Without Glue Records
If domain example.com uses ns1.example.com as its name server, finding the IP for ns1.example.com requires knowing example.com's DNS — a circular dependency that makes resolution impossible.
The Solution: Glue Records
Glue Records are stored in the parent zone (.com, .net) and provide a direct IP mapping for the NS hostname:
ns1.example.com. IN A 192.168.1.1
ns2.example.com. IN A 192.168.1.2💡 For most users: Glue Records are only needed when creating your OWN name servers. If you're using ns1.zevshost.net, they're already configured for you.
Verify Glue Records
dig NS example.com +additionalThe ADDITIONAL section shows A records for NS servers — those are the Glue Records.