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IP addresses are assigned to a host either dynamically as they join the network, or persistently by configuration of the host hardware or software. Persistent configuration is also known as using a static IP address. In contrast, when a computer's IP address is assigned each time it restarts, this is known as using a dynamic IP address.
How private is my IP address? It depends. The operators of any website that you visit can see it. If you are not logged into Wikipedia, your IP address is publicly recorded with every edit that you make. If you are logged in, your IP address is hidden from all but a very small number of trusted administrators. In some cases, it is possible that ...
After the seizure the domain name registry alters registered information about the domain name, including the IP address on its domain name server (DNS), as property of the U.S. government. When a user intends to access the website from a domain that has been seized, DNS servers reply with the government server's IP address.
Lookups of IP address allocations are often limited to the larger Classless Inter-Domain Routing (CIDR) blocks (e.g., /24, /22, /16), because usually only the regional Internet registries (RIRs) and domain registrars run RWhois or WHOIS servers, although RWhois is intended to be run by even smaller local Internet registries, to provide more ...
A reverse DNS lookup is a query of the DNS for domain names when the IP address is known. Multiple domain names may be associated with an IP address. The DNS stores IP addresses in the form of domain names as specially formatted names in pointer (PTR) records within the infrastructure top-level domain arpa. For IPv4, the domain is in-addr.arpa.
Either way, it can use the IP address to determine which website to serve. The client is not involved in this process and therefore (unlike with name-based virtual hosting) there are no compatibility issues. The downside of this approach is the server needs a different IP address for every web site.
Network address translation between a private network and the Internet. Network address translation (NAT) is a method of mapping an IP address space into another by modifying network address information in the IP header of packets while they are in transit across a traffic routing device. [1]
Unix-like operating systems commonly implement IP address blocking using a TCP wrapper, configured by host access control files /etc/hosts.deny and /etc/hosts.allow.. Both companies and schools offering remote user access use Linux programs such as DenyHosts or Fail2ban for protection from unauthorized access while allowing permitted remote access.