IpV4 versus Ip6

IPv4 is the original classical IP addresses that most people recognize - 126.121.223.124. It’s 32 bit integer divided into 4 bytes.

Problem is that the world grew larger and we have run out of IPv4 addresses. We had workarounds of only allocating one public address to a household on their router and allocating addresses like 192.168.X.X to private internal IP addresses etc.

IP6 has 2^128 addresses which is probably enough of a buffer? Hopefully.

These days writing a TCP/IP library I would assume all modern platforms support IPV6.