The campus network at Florida International University. Currently a mix of ATM, Ethernet and Fast Ethernet. FIU has an entire Class B (or, what was a Class B before CIDR) at its disposal. That's 65536 addresses. Another way of saying it is 131.94.0.0/16. Allocation of it has been rather messy in the past and network administrators have been trying to renumber as to make more efficient use of the address space. FIUnet is rather well managed and reliable, we have had very few network outages, allowing me to use Everything in a very trouble free manner!

FIUnet used to use all kinds of protocols, including LAT, IPX, Pathworks and so on. Luckily all these old protocols were abolished, and TCP/IP is the victor!