Although, the guts of the Internet DEC engineering network was a Class A (net 16) address and it was IP routed and IP managed and DECnet hung off of it once it got an extreme size and scale. On Mon, Jan 7, 2013 at 2:01 PM, <Paul_Koning at dell.com> wrote: On Jan 7, 2013, at 1:52 PM, Ian McLaughlin wrote: The internal net at DEC was seriously out of addresses, though just like IP that's partly because the addressing scheme forced it to be somewhat sparse. Still, there were certainly tens of thousands of nodes on it. paul