It is the second major failure in Telecom's broadband network in two weeks.
Around 25,000 mainly residential customers lost service lost their connections on November 30, after a fibreoptic cable failed after system upgrade work.
"Almost immediately we noticed there was an issue with the broadband. It took three hours to restore, but during that time customers were affected across the country." a spokeswoman said at the time.
Telecom apologised for the inconvenience - but ruled out compensation for customers who lost productivity due to the outage.
"The broadband and the mobile network, there's no guarantees around that service - that's in the terms and conditions that people sign up to at the front.
"In this instance it was resolved relatively quickly, and the fact [is] that it happened relatively early in the morning, when not many people would have been using their internet," said the spokeswoman.
- nzherald.co.nz