Within each network class, there is designated IP space that is reserved for private or non-public use and, thus, cannot be routed over the global Internet. This private address space is defined under Request For Comments 1918, or more commonly called RFC 1918. The RFC is a group of memoranda issued by the Internet Engineering Task Force (IETF) that helps define Internet operating standards.
Class A Private Space: 10.0.0.0 – 10.255.255.255, with a subnet mask of 255.0.0.0 or /8
Class A Reserved Space: 127.0.0.0 – 127.255.255.255, with a subnet mask of 255.0.0.0 or /8 (reserved for loopback addressing)
Class B Private Space: 172.16.0.0 – 172.31.255.255, with a subnet mask of 255.255.0.0 or /16
Class C Private Space: 192.168.0.0 – 192.168.255.255 with a subnet mask of 255.255.255.0 or /24
Other Classes
Class D networks are reserved for multicast addressing. This covers the range of 224.0.0.0 – 239.255.255.255. No subnet information is defined for this special range.
Class E networks are reserved for experimental purposes for future research and development. This covers the range of 240.0.0.0 – 255.255.255.254. No subnet information is defined for this special class either.
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