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An IP address is a numerical label assigned to a device connected to a network that uses the Internet Protocol for communication. Learn about the two main functions of IP addresses, the two versions of the Internet Protocol (IPv4 and IPv6), and the format and notation of IP addresses.
There are two primary types of IP addresses in use today: IP version 4 (IPv4) and IP version 6 (IPv6). The former has been around since January 1983 , and is still the most common.
WHOIS is a query and response protocol for querying databases of Internet resources, such as domain names, IP addresses and autonomous systems. Learn about the origin, development and features of WHOIS, as well as its sister protocol RWhois and the proposed new standard IRIS.
Reverse DNS lookup is the querying technique of the Domain Name System (DNS) to determine the domain name associated with an IP address. Learn how reverse DNS works for IPv4 and IPv6 addresses, its historical usage, and its applications.
nslookup is a command-line tool for querying the Domain Name System (DNS) to obtain the mapping between domain name and IP address, or other DNS records. It is a member of the BIND name server software and has different behaviors and features from dig and host.
ARIN is a nonprofit corporation that allocates and registers IP addresses and AS numbers for the United States, Canada, and many Caribbean and North Atlantic islands. ARIN provides WHOIS services for directory information, routing information, and DNS (Reverse) queries.
Learn about the large /8 blocks of IPv4 addresses, formerly known as Class A networks, that are assigned to various organizations or groups. See the reserved, private, loopback, multicast, and future use blocks, as well as the assigned blocks to commercial and military entities.
Find out your IP address and learn how it is used and protected on Wikipedia. This page also explains what an IP address is, how private it is, and why you might need to share it.
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