This week in class we learned about IPv4 and IPv6 and why IPv4 ended up being replaced by IPv6. IPv4 was replaced because it simply couldn't keep up with how many IP addresses we actually need nowadays due to it being limited by its 32 bits system giving it a max of only 4.3 billion IP addresses. This isn't enough for today's day and age where IPv6 can have a total of 340 undecillion IP addresses which is insane to think such a high number can be reached. Although when it was made probably no one believed we would need more IP addresses then IPv4 can provide.
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