I've run into a number of networks in my area (private businesses, a couple municipalities, a couple law enforcement agencies) all using the 192.9.1.0/24 subnet

I've run into a number of networks in my area (private businesses, a couple municipalities, a couple law enforcement agencies) all using the 192.9.1.0/24 subnet. There was some overlap in these sites w/ respect to IT service companies involved in their setup. Best as I can guess it came down to one person who floated between the employ of a couple (or three) IT service companies leaving a swath of 192.9.1.0/24 in their wake (or maybe training other technicians during their time at these companies). It seems like this work might have been done pre-RFC 1597 (which is, I think, the first place that what is today's RFC 1918 address space shows up) but I think they were just following examples. I'd love to know what examples motivated the us of this address space. I find some old Sun docs[0] referencing this address space, and RFC 2328[1] makes reference to it. [0] http://bitsavers.informatik.uni-stuttgart.de/pdf/sun/sunos/3.0/800-1323-03B_System_Administration_for_the_Sun_Workstation_198602.pdf http://bitsavers.informatik.uni-stuttgart.de/pdf/sun/sunos/3... [1] https://www.ietf.org/rfc/rfc2328.txt https://www.ietf.org/rfc/rfc2328.txt