Australia's .au domain overseer auDA has shifted its Melbourne infrastructure into an Internode-run data centre under a three-year deal.
The deal sees auDA become an "anchor tenant" in the new Internode facility.
auDA said the facility would act as its primary facility and "one of 13 sites around the globe that runs DNS servers for domain name resolution in the .au space".
Internode's long-running support of the IPv6 protocol is said to be one reason that got the company over the line with the auDA contract.
The contract also covers redundant dual internet connections and a "separate backup connectivity solution".
"As we're charged with running the .au domain space, we need both stability and capacity - and security is also vital to our operations," auDA's chief technology officer Adam King said in a statement.
King said auDA ran equipment from "multiple vendors" but could not disclose details of its configuration.
"Since we host critical infrastructure of national importance, we don’t release details of the equipment it contains," he said.
Customer service was a factor in the decision.
"Internode understands that I will only call if our world is ending," he said.
"They recognise the importance of their role to the successful operation of the Internet in Australia."