FAQ 4: LAN addressing requirements - RFC1918 specification for local LAN
Subnet Size IP Address Range Number Of Hosts
24-bit block 10.0.0.0 - 10.255.255.255 (16,777,216)
20-bit block 172.16.0.0 - 172. 31.255.255 ( 1,048,576)
16-bit block 192.168.0.0 - 192.168.255.255 ( 65,536)
Note: Any address outside of the ranges shown above are considered WAN (Internet) addresses. You cannot use a remote or WAN address to configure Plex unless you use a SSH Tunnel. (see below)
References:
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IETF - RFC-1918 (page 4)
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Wikipedia: Private Network