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Some large / 8 blocks of IPv4 addresses, the former Class A network blocks, are assigned in whole to single organizations or related groups of organizations, either by the Internet Corporation for Assigned Names and Numbers (ICANN), through the Internet Assigned Numbers Authority (IANA), or a regional Internet registry.
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 ...
In the Internet addressing architecture, the Internet Engineering Task Force (IETF) and the Internet Assigned Numbers Authority (IANA) have reserved various Internet Protocol (IP) addresses for special purposes. [1]
For example, to do a reverse lookup of the IP address 8.8.4.4 the PTR record for the domain name 4.4.8.8.in-addr.arpa would be looked up, and found to point to dns.google. If the A record for dns.google in turn pointed back to 8.8.4.4 then it would be said to be forward-confirmed .
[[WP:Blocking policy#Evasion of blocks|Block evasion]] <!-- static IP --> 798 103.220.77.24: Materialscientist 20231113085200 20261113085200 vandalism, see also edit filter log 799 148.83.134.7: Materialscientist 20231113095123 20261113095123 vandalism, see also edit filter log 800 77.75.110.147: Materialscientist 20231113114201 20261113114201
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The RIPE Database [16] is a public database containing registration details of the IP addresses and AS numbers originally allocated to members by the RIPE NCC. It shows which organisations or individuals currently hold which Internet number resources, when the allocations were made and contact details. The organisations or individuals that hold ...
The Routing Assets Database (RADb), formerly known as the Routing Arbiter Database is a public database in which the operators of Internet networks publish authoritative declarations of routing policy for their Autonomous System (AS) which are, in turn, used by the operators of other Internet networks to configure their inbound routing policy filters.