Just like the banks, most of our larger NZ ISPs are becoming Aussie owned.

Pioneers who built NZ’s third biggest telco and broadband provider sell to Aussie firm.
M2 is publicly listed on the ASX and has revenues in excess of A$1 billion.
M2 said it would continue to operate the business as a stand-alone company and retain the management including Callander, who commented things would be "business as usual" for the telco - which is made up of CallPlus Business, Slingshot, Orcon, Flip and 2talk.

http://www.nzherald.co.nz/business/news/article.cfm?c_id=3&objectid=11432076