Netnod AB (previously Netnod Internet Exchange i Sverige AB) is a private limited company based in Stockholm, Sweden, that operates Internet exchange points and manages one of the thirteen root name servers for the Domain Name System (DNS).

[2] The predecessor to the TU Foundation / Netnod was the D-GIX, an Internet exchange point that was established at the Royal Institute of Technology (KTH) in Stockholm and operated by KTHNOC.

In 1996 a report by a committee, (Swedish: Internetutredningen) had listed infrastructure that was critical for the operation of the Internet in Sweden.

A number of factors led KTH as well as the Swedish ISPs to conclude that a separate legal entity would be a better operational format.

In the beginning the staff mainly focused on DNS and management and the operations continued to be outsourced to the military.

[3] At the Netnod IXPs, Netnod provides a variety of value-adding services such as the RIPE Internet Routing Registry (IRR), Bredbandskollen (a consumer broadband speed test), slave services for several DNS TLDs, the DNS root server i.root-servers.net.

Netnod provides anycast and unicast slave service to TLDs worldwide through its DNSNODE product.

From the beginning, as was cited in the Internetutredningen report, the IX operated by Netnod was considered as critical national infrastructure.

Autonomica AB was a fully owned subsidiary of Netnod that operated several critical infrastructure pieces on the Internet.

Autonomica is currently (in 2022), in a legal sense, a brand of Netnod AB since the merger of the two previously separate organisations.

Autonomica was set up with three staff, one responsible for co-ordination of the operation of the IXes and two that were moved from the Royal Institute of Technology in Stockholm.

[citation needed] Autonomica staff are also frequently involved in presenting and chairing sessions in operational conferences such as RIPE, APRICOT /APNIC, SANOG, MENOG and NANOG.

Autonomica provides several for free services for the good of the Internet, such as i.root-servers.net, one of the 13 Root-servers, and NTP servers tied to UTC.

By the time D-GIX was replaced by Netnod, the exchange point consisted of two FDDI switches in Stockholm and one was also installed in Gothenburg.

Netnod said they were willing to implement Gigabit Ethernet, but wanted eight operators to promise to sign up to cover the costs.