The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.
One of a set of tools we're offering as a way of saying thank you for being a part of the community.
the cleanest way I have done this is by building a temp NT PDC, then upgrade it to Win 2K3 which would give you AD, then add the new Win2k3 server to the domain and make it the primary server by transfering all the FSMO roles, install Exchange Active Directory connector on the temp box and move all mailboxes from 5.5 to 2003. Once this is all complete follow the kb articles about removing the last 5.5 Exchange server and then shutdown the NT box, and delete the server object. the demote the temp server andremove from the domain.
This way you have a legacy free new server without having to run the risks of upgrading the old NT box, or have the NT upgrade file on the new server. Sounds like alot of work but is definately worth it at the end of the day.