Snozzberry

I have a class of 25 students that need to create accounts in Second Life as part of a course on Digital Identities. All need to set up and access their accounts through the school, which gives them a shared IP address. About half the class was able to register an account, and the rest received messages that "there is a limit to the number of accounts any household or individual may create" and that we have "exceeded the limit." Is there any possibility of extending the number of accounts per IP address for educational settings? Thanks!