The following resources contain additional information on IPv4. 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.
IPv4 on Wikipedia − The wikipedia page on IPv4.
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.
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