Question: What Is a Public IP Address?
An IP address
is considered public if the IP number is valid and falls outside any of the IP address ranges reserved for private uses by Internet standards groups. (See private IP addresses
Public IP addresses are used by Internet servers including those for Web sites and DNS servers), network routers or any computer connected directly to the Internet via a modem.
Each public IP is assigned to a range or block of addresses. The Internet Assigned Numbers Authority (IANA) controls ownership of these IP ranges and assigns each block to organizations such as Internet Service Providers (ISPs) who in turn allocate individual IP addreses to customers.