The deal will enable the two companies to have mutual access across their respective LoRaWAN IoT (Long-Range Wide Area Internet of Things) networks, Spark said in a statement.
It would enable businesses in both countries to implement cost-effective smart technology solutions without needing to set up operations in the other country, Spark said.
For example, Spark would be able to help New Zealand app Parkable, Australia's fastest-growing parking app, to expand its business.
"It's exciting to know that we now have access to growing network coverage in Sydney, Canberra, Gold Coast, Tasmania, Melbourne and regional areas in New South Wales, Queensland and Victoria. Those markets have just been unlocked for us, so we are eager to grow and scale."
Spark IoT lead Tony Agar said: "As the economy continues to be shaped by COVID-19, we could expect to see more partnerships like this where carriers and partners work together to enable the deployment and scaling of IoT solutions across markets.
"If we have a customer who wants to deliver services in Australia, they can now do so from the comfort of their offices in Aotearoa, without the need to set up operations across the Tasman. It also means that they can keep visibility and monitor their machinery, assets or infrastructure using their already well-established dashboards and diagnostic tools."
The deal has been made possible with the integration of NNNCo's enterprise data platform N2N-DL into Spark NZ's network core. Data from devices will feed into N2N-DL giving Spark NZ customers access to data on a single platform from devices enrolled in either country.
NNNCo chief executive Rob Zagarella said: "We're seeing increasing demand from customers requiring cross-Tasman roaming capabilities as they deploy IoT devices and applications beyond Australia.
"We're very happy to now be able to provide a seamless and consistent service with N2N-DL as a customer's single source of aggregation for IoT devices in either country and on either network."