A glue record associates ("glue together") hostname (nameserver, or DNS ) with an IP address at the registry. These DNS records are created at the domain's registrar and provides a complete answer when the TLD nameserver returns a reference for an authoritative nameserver for a domain.
You should check out more in-depth information about Glue Records and DNS Branding: DNS Branding / Vanity Name Servers / White-Label DNS.
There are some special requirements applied for certain TLDs such as .de, .be, .fr, .re, and some others as well. According to their registries, the name servers of the domain at the registrar must match the NS records in the DNS Zone.
The requirements for those top level domains come with some specific rules when it comes to their Glue Records. The configuration is very similar to the other TLDs, but with one major difference - instead of adding them from the Child name servers tab, you add them from the Name servers tab.
To do that, you need to follow these steps:
1. Navigate to your domain name's management page.
2. Go to the Name servers tab.
3. Once there, add your own named DNS server and the IP of our DNS servers, with space between them. Sample of such kind of configuration for a .de domain can be seen below:
Nameserver 1: ns1.your-domain.de 126.96.36.199
Nameserver 2: ns2.your-domain.de 188.8.131.52
Nameserver 3: ns3.your-domain.de 184.108.40.206
Nameserver 4: ns4.your-domain.de 220.127.116.11
Note: You should use the IP addresses listed on the right of your Dashboard. In the article, we are using example IP's.