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en.wikipedia.org/wiki/IPv4

Internet Protocol version 4 (IPv4) is the fourth version of the Internet Protocol (IP). It is one of the core protocols of standards-based internetworking methods in the Internet, and was the first version deployed for production in the ARPANET in 1983. It still routes most Internet traffic today, despite the ongoing deployment of a successor protocol, IPv6.

www.webopedia.com/DidYouKnow/Internet/ipv6_ipv4_difference...

IPv6 is the successor to Internet Protocol Version 4 (IPv4). It was designed as an evolutionary upgrade to the Internet Protocol and will, in fact, coexist with the older IPv4 for some time. IPv6 is designed to allow the Internet to grow steadily, both in terms of the number of hosts connected and the total amount of data traffic transmitted.

www.techwalla.com/articles/what-is-an-ipv4-address

IPv4 is a type of Internet networking protocol that functions as an address for devices connected to a network. Once connected to a network, an IPv4 address is assigned by the host (usually an Internet service provider, or ISP) to the client (the user's device, be it computer, cell phone or gaming system) as a way of identifying where queried traffic should be routed to.

www.techopedia.com/definition/5367/internet-

Internet Protocol Version 4 (IPv4) is the fourth revision of the Internet Protocol and a widely used protocol in data communication over different kinds of networks. IPv4 is a connectionless protocol used in packet-switched layer networks, such as Ethernet.

mashable.com/2011/02/03/ipv4-ipv6-guide

More IPv4 addresses are available to be assigned and more will be traded or sold (since IPv4 addresses are now a scarce resource), but they will become a scarcer commodity over the next two years ...

whatismyip.host

Find and trace your IP (Internet Protocol) Address using this tool. An IP is a unique identifier for your network connection. View your IPv4 and IPv6 address.

www.lifewire.com/what-is-ipv4-ipv6-2483315

IPv4 addresses aren't going away any time soon. Those addresses are still in use, and though we have exhausted the supply of new ones, older ones can still be bought and sold. Perhaps one day adoption of IPv6 will reach 100% and there will no longer be any IPv4 addresses in use, but that day is likely still in the distant future.

www.ip-adress.eu

An Internet Protocol address (IP address) is a numerical label assigned to each device participating in a computer network that uses the Internet Protocol for communication.

www.colocationamerica.com/ip-services/ipv4.htm

What Is a Subnet? During the early days of the Internet (before it was named the world-wide-web), the US Department of Defense agency developed IPv4 – a quad dotted decimal format to test the limits of its networking capabilities.

en.wikipedia.org/wiki/IPv6

Internet Protocol version 6 (IPv6) is the most recent version of the Internet Protocol (IP), the communications protocol that provides an identification and location system for computers on networks and routes traffic across the Internet.IPv6 was developed by the Internet Engineering Task Force (IETF) to deal with the long-anticipated problem of IPv4 address exhaustion.