Numbering for IT

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IP Numbering


The Internet Network Information Centre at NIC.DDN.MIL has assigned the class B network [129.100.0.0] (known as UWO-NET) to the University of Western Ontario. The Department of Computing and Communications Services (CCS) manages the assignment of numbers from that network and coordinates the interconnection of local networks to one another and the world. The Internet NIC has delegated authority and responsibility for UWO-NET to the local NIC which is CCS.

By a class C subnet we mean a physical network(s) with systems assigned numbers from an IP-net of the form [129.100.x.0] for some fixed value of x. For example, the campus backbone is the class C subnet [129.100.3.0] known as backbone.net.uwo.ca in the Domain Name System. By an autonomous subnet we mean a subnet with the administration and assignment of numbers handled locally by designated individuals. The NIC at UWO encourages the establishment of autonomous class C subnets.

The net mask for UWO-NET is uniformly 255.255.255.0 or FFFFFF00.

On each subnet certain host numbers (the last octet) are reserved by the network or by the NIC and NOC. The following table outlines these assignments for a non-backbone subnet 129.100.x.0:


IP Number or range Use
129.100.x.0 The IP number of the entire subnet
129.100.x.1 CCS supplied gateway address
129.100.x.2 Gatorbox (Appletalk) router
129.100.x.3 Non-CCS gateway address (tiered network)
129.100.x.4 Reserved for the NIC and NOC
129.100.x.5 Reserved for the NIC and NOC
129.100.x.6 Reserved for the NIC and NOC
129.100.x.7 Reserved for the NIC and NOC
129.100.x.8 Reserved for the NIC and NOC
129.100.x.9 Reserved watcher.ccs.uwo.ca (network monitor)
129.100.x.10-254 Useable host numbers on this subnetwork
129.100.x.255 Broadcast address


Note that there are currently certain anomalies on the network that don't follow this scheme. They have been grandparented in. New assignments should follow the scheme outlined above.

On the backbone network, 129.100.3.0, the host numbers from 1 through 99 have been reserved for routers and other network servers. Machines should be numbered starting at 100.

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