The following resources contain additional information on IPv4 & IPv6. Please use them to get more in-depth knowledge on this topic.
Transmission Control Protocol - A complete specification of TCP protocol. (RFC 793)
IP/IPv4 Protocol - A complete specification of th eInternet Protocol Version 4 (RFC 791)
IP/IPv6 Protocol - A complete specification of th e Internet Protocol Version 6 (RFC 791)
IANA IPv4 Address Space Registry - The allocation of Internet Protocol version 4 (IPv4) address space to various registries is listed here.
IPv6 on Wikipedia - The wikipedia page on IPv6.
IP-Lookup - This helps you to find information about your current IP address or any other IP address. It supports both IPv4 and IPv6 addresses.
IP Version 6 Working Group - IP Version 6 Working Group (ipv6).
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