We're being urged not to jump to conclusions about the New Zealand teachers, who've been identified in the Ashley Madison leak.

The leaked data includes the email addresses of 77 teachers, from 65 different schools.

Technology expert Peter Griffin said it's possible a lot of the addresses were registered by teenage pranksters.

"It could easily be students signing up their teacher as a joke, so we need to be a bit careful about using some of this data."

The website didn't require users to verify their email address, so people could have had their email address registered without their knowledge.

However, the Ministry of Education earlier said it's concerned if there's been unprofessional use of school addresses.

It said school boards will also be concerned, and will investigate any cases of staff using email addresses inappropriately.