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Appendix C. Lists of Reserved Ports, ICMP Types and Codes, and Internet Protocols
Class IP
intervals
7 0-1 2-3 4-5 6-7 8-9 10-11 ... 254-255
8 0 1 2 3 4 5 ... 255
You could have a large network, for example 130.234.128.0/18, which is interpreted from the tables as all IP
addresses from 130.234.128.0 to 130.234.191.255, inclusive (18 is in class no. 2, giving an IP interval of 128-191).
N.B.: The netmask only reaches the third byte, which means that all IP addresses in byte 4 are available.
Reserved IP addresses
The Internet Assigned Numbers Authority (IANA) has reserved the following three blocks of the IP address space
for private internets (see also RFC 1918):
• 10.0.0.0 - 10.255.255.255 (10/8)
• 172.16.0.0 - 172.31.255.255 (172.16/12)
• 192.168.0.0 - 192.168.255.255 (192.168/16)
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