Specifications change over time

Specifications of protocols change over time. For example original HTML format got changed as HTML started to support images and videos.

It applies to TCP/IP protocol as well. Although I don't think that TCP portion got changed, but IP portion got changed for sure.

IP addresses are used with conjunction with TCP protocol they specify where the data needs to be send to.

Original IP protocol consisted of 4 numbers ranging from 0 to 255. The upper limit was a little bit over 4 billion of addresses. Even so it was a huge number, when IPv4 was first introduced, it got exhausted when TCP/IP protocols got widely accepted. To overcome this limitation IPv6 protocol got introduced, this protocol support even larger number of devices.

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