IP addresses are how all our internet connected devices communicate with each other with great synergy, without these addresses your devices cannot communicate. IP addresses are important for both inside and beyond the firewall.
Each Internet connected device has an unique address on the Internet, which can be used to send things to it. This is what we refer to as the IP address. There are actually two IP versions in use on the Internet today, which coexist but vary in the form of the addresses:
- Internet Protocol version 4 (IPv4) is the most common protocol used by Internet connected devices. IPv4 addresses consist of 4 bytes worth of information, i.e., four dot-separated numbers each in the range of 0–255. This makes a total of 232 = 4,294,967,296 unique addresses on the Internet. For example, Yahoo’s server IPv4 address is 126.96.36.199.
When IPv4 was created, it was not known how many interconnected devices there would be. Despite the relatively large number of address, we have already exhausted our pool of IPv4 address, click here to learn about one solution.
- Internet Protocol version 6 (IPv6) is the successor to IPv4. IPv6 uses longer addresses that support 7.9×1028 times as many addresses as IPv4! IPv6 addresses are made up of eight colon-separated groups of four hexadecimal digits per group, where leading zeroes in each group may be omitted for brevity. Yahoo’s server IPv6 address is 2001:4998:c:a06::2:4008