Net::DNS::Nameserver

I was just looking at a survey of nameserver software. For some reason Net::DNS::Nameserver seems to serve a significant number of zones. On the other hand it seems to only have 6 installed instances.  I am curious. Who would use Net::DNS::Nameserver to serve their zones in production.  I suspect these are false positives.

On the other hand Bert’s Secure Reverse Polish DNS Calculator (BSRPDNSC) might have inspired folk.