While working on presentation about IP cameras, Artem crafted a handy shell script that searches for active IP cameras by going over camera vendor's DNS records. The result was some handy numbers, as well as information on how people are using camera vendor provided DDNS service.
Last week I was visting a friend (привет, Виктор!) in Seattle. Between beers, he mentioned Go - a programming environment he uses in one of his projects. He combined next pint with a Go programming lesson and as a result, we wrote a 100 line amazingly simple multi-threaded scanner that does the same as above mentioned script, but in much more configurable and reliable way.
$ go run scanner.go --help
and the rest should be clear. It currently searches for records with prefix xx1234(two letters and 4 digits), but it should be trivial to change the pattern that matches particular camera vendor's DNS records.