IPv4: bits, dotted decimal, NAT common, ARP for address resolution, broadcast supported. IPv6: bits, hexadecimal, NAT rare (enough addresses), NDP replaces ARP, multicast replaces broadcast. IPv6 headers are simpler with fixed length. IPv6 has built-in IPsec support and mandates larger minimum MTU ( bytes vs ). Transition is gradual since both protocols coexist.
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$ curl repovive.com/roadmaps/network-design/ip-addressing-and-subnetting/ipv4-vs-ipv6-comparison
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