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Afnic and .SE release Zonemaster – new key tool improving Internet resilience

Home > Observatory and resources > News > Afnic and .SE release Zonemaster – new key tool improving Internet resilience

After a successful one-year partnership between Afnic and .SE, Zonemaster, the new DNS (Domain Name System) checking tool, is released today.
As a successor to the well-known ZoneCheck and DNSCheck tools (respectively by Afnic and .SE), Zonemaster aims to become a world-class reference instrument for DNS checking.


The DNS being an essential infrastructure for Internet communications, regularly checking the technical quality of Internet domain names is key to improving the resilience of the global Internet.

Zonemaster by .SE and Afnic (Logo)

Available to all as free software, Zonemaster can be alternatively used via a public web interface on or in a local environment through a command-line or a graphical user interface, after downloading its components from and installing them on a Unix machine.
The service is available in English, French and Swedish.


Zonemaster checks DNS servers and zones configuration against a set of tests based on Internet standards and best current practices to determine that they are correct. By running Zonemaster on a given DNS zone, potential issues related to misconfigurations or security mechanisms (such as DNSSEC) are detected, thus helping avoid degradation or entire unreachability of Internet communication services based on that DNS zone.


  • For Mathieu WEILL, CEO of Afnic: 
    We are proud of providing the Internet community with Zonemaster, as a state-of -the-art checking tool for Internet domain names. We hope that the DNS community will make the most of it to contribute to a safer and more resilient Internet infrastructure.
  • For Danny AERTS, CEO of .SE: 

 “Thanks to our previous knowledge and thanks to the good effort of the experienced  joint .SE and Afnic project team our efforts have been leveraged to create the software in a much higher quality and in shorter time than otherwise possible.

About .SE

.SE (The Internet Infrastructure Foundation) is an independent organization that promotes the positive development of the internet in Sweden.
.SE is responsible for the internet’s Swedish top level domain, .se, including the registration of domain names, and the administration and technical maintenance of the national domain-name registry.
The surplus from domain name registration support projects that contribute to internet development in Sweden, both through its own operations and through financing of independent projects.


About Afnic

Afnic is the acronym for Association Française pour le Nommage Internet en Coopération, the French Network Information Centre. The registry has been appointed by the French government to manage domain names under the .fr Top Level Domain. Afnic also manages the .re (Reunion Island), .pm (Saint-Pierre and Miquelon), .tf (French Southern and Antarctic Territories), .wf (Wallis and Futuna) and .yt (Mayotte) French Overseas TLDs.

In addition to managing French TLDs, Afnic’s role is part of a wider public interest mission, which is to contribute on a daily basis, thanks to the efforts of its teams and its members, to a secure and stable internet, open to innovation and in which the French internet community plays a leading role. As part of that mission, Afnic, a non-profit organization, has committed to devoting 11% of its Revenues from managing .fr Top Level Domain to actions of general interest, in particular by transferring €1.3 million each year to the Afnic Foundation for Digital Solidarity.
Afnic is also the back-end registry for the companies as well as local and regional authorities that have chosen to have their own TLD, such as .paris, .bzh, .alsace, .corsica, .mma, .ovh, .leclerc and .sncf.

Established in 1997 and based in Saint-Quentin-en-Yvelines, Afnic currently has nearly 90 employees.