Useful links & glossary

Nameserver software developed by the community in Europe

  • KNOT DNS: Knot DNS is a high-performance authoritative-only DNS server that supports all key features of the modern domain name system. By CZ.nic, the ccTLD registry for .cz.
  • KNOT RESOLVER: The Knot Resolver is a caching DNS resolver scalable from huge resolver farms down to home network routers. By CZ.nic, the ccTLD registry for .cz.
  • YADIFA: YADIFA® is a name server implementation developed from scratch by EURid, the ccTLD registry for .eu. It's clean, small, light, and RFC-compliant. And just like other implementations, YADIFA is portable across multiple operating systems, including Linux, FreeBSD, OpenBSD, and Solaris.
  • NSD: The NLnet Labs Name Server Daemon (NSD) is an authoritative DNS name server. It has been developed for operations in environments where speed, reliability, stability, and security are of high importance.
  • UNBOUND: Unbound is a validating, recursive, caching DNS resolver made by NLnet Labs. It is designed to be fast and lean and incorporates modern features based on open standards.

Testing domain configuration

  • DMARC.LV: checks your email security settings.
  • DNSVIZ.NET: is a tool for visualizing the status of a DNS zone. It was designed as a resource for understanding and troubleshooting the deployment of the DNS Security Extensions (DNSSEC). It provides a visual analysis of the DNSSEC authentication chain for a domain name and its resolution path in the DNS namespace, and it lists configuration errors detected by the tool.
  • ZONEMASTER.NET: is a program designed to help people check, measure, and understand how the DNS (Domain Name System) works. By AFNIC, the ccTLD registry for .fr, and INTERNET STIFTELSEN, the ccTLD registry for .see.
  • HARDENIZE.COM: provides a managed service that combines automated discovery of your Internet assets with continuous network and security configuration monitoring.


  • DNS: the domain name system, see also Understanding DNS.
  • TLD, ccTLD, sTLD, gTLD: top-level domain, country-code top-level domain, special purpose top-level domain, generic top-level domain, see also Understanding DNS.
  • Registry, registrar, registrant: respectively the entity that operates a top-level domain, the entity that commercialises the domain names, and the customer that buys a domain name. See also Understanding DNS.
  • EPP: A protocol used for electronic communication between a registrar and a registry for provisioning (creating, amending, and removing) domain name registrations. 
  • NIS 2 Directive: refers to Directive (EU) 2022/2555 on measures for a high common level of cybersecurity across the Union, NIS meaning network and information systems.
  • TLP: The European TLD ISAC follows the traffic light protocol (TLP).