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Domain Name System Security Extensions Now Deployed in all Generic Top-Level Domains

LOS ANGELES – 23 December 2020 – Today, the Internet Corporation for Assigned Names and Numbers organization (ICANN org) announced that all of the current 1,195 generic top-level domains (gTLDs) have deployed Domain Name System Security Extensions (DNSSEC).

DNSSEC allows registrants to digitally sign information they put into the Domain Name System (DNS). This protects consumers by ensuring that DNS data that has been corrupted, either accidentally or maliciously, doesn't reach them.

A strategy of defense in depth, in which several independent layers of security controls are used so that if one fails another will be operative, can improve security of the overall system. DNSSEC can provide one tier of defense in depth for the Internet. In order to improve the security of the Internet, DNSSEC must be widely deployed across all TLDs. With .AERO signing its zone, 100% of gTLDs are now signed. This news is an important milestone as all now have DNSSEC, enabling its availability to their registrants.

"This is important news because it means that more users everywhere can have increased trust in the responses to DNS lookups" said David Conrad, Senior Vice President and Chief Technology Officer (CTO) at ICANN org. "As DNSSEC deployment grows, the DNS can also become a foundation for other protocols that require a way to store data securely".

ICANN will continue to encourage those country code top-level domains that have not DNSSEC-signed to their zones to do so, and will encourage operators of DNS resolvers, which check DNSSEC signatures to verify the data has not been modified, to enable DNSSEC validation.

Interested in learning more about DNSSEC? Click the hyperlinks to access our dedicated webpage, explore our infographic, and read our DNSSEC Explainer.


ICANN's mission is to help ensure a stable, secure, and unified global Internet. To reach another person on the Internet, you need to type an address – a name or a number – into your computer or other device. That address must be unique so computers know where to find each other. ICANN helps coordinate and support these unique identifiers across the world. ICANN was formed in 1998 as a not-for-profit public-benefit corporation with a community of participants from all over the world.

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Domain Name System
Internationalized Domain Name ,IDN,"IDNs are domain names that include characters used in the local representation of languages that are not written with the twenty-six letters of the basic Latin alphabet ""a-z"". An IDN can contain Latin letters with diacritical marks, as required by many European languages, or may consist of characters from non-Latin scripts such as Arabic or Chinese. Many languages also use other types of digits than the European ""0-9"". The basic Latin alphabet together with the European-Arabic digits are, for the purpose of domain names, termed ""ASCII characters"" (ASCII = American Standard Code for Information Interchange). These are also included in the broader range of ""Unicode characters"" that provides the basis for IDNs. The ""hostname rule"" requires that all domain names of the type under consideration here are stored in the DNS using only the ASCII characters listed above, with the one further addition of the hyphen ""-"". The Unicode form of an IDN therefore requires special encoding before it is entered into the DNS. The following terminology is used when distinguishing between these forms: A domain name consists of a series of ""labels"" (separated by ""dots""). The ASCII form of an IDN label is termed an ""A-label"". All operations defined in the DNS protocol use A-labels exclusively. The Unicode form, which a user expects to be displayed, is termed a ""U-label"". The difference may be illustrated with the Hindi word for ""test"" — परीका — appearing here as a U-label would (in the Devanagari script). A special form of ""ASCII compatible encoding"" (abbreviated ACE) is applied to this to produce the corresponding A-label: xn--11b5bs1di. A domain name that only includes ASCII letters, digits, and hyphens is termed an ""LDH label"". Although the definitions of A-labels and LDH-labels overlap, a name consisting exclusively of LDH labels, such as"""" is not an IDN."