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2. DNS blocking - Wikipedia

   en.wikipedia.org/wiki/DNS_blocking

   Instead of returning the valid IP address of a requested site (for example, instead of 198.35.26.96 being returned by the DNS when "www.wikipedia.org" is entered into a browser, [2] if this IP were on a block list, the DNS might reply that the domain is unknown or with a different IP address that directs to a site with a page stating that the ...

3. Wildcard DNS record - Wikipedia

   en.wikipedia.org/wiki/Wildcard_DNS_record

   Wildcard domains are widely used by blogging websites that allow users to create sub-domains upon demand; e.g., sites such as WordPress or Blogspot. Another popular use is by Free Dynamic DNS websites that allow users to create a DNS name that changes to match their host IP as the IP address is changed periodically by their ISP's DHCP server.

4. Domain Name System blocklist - Wikipedia

   en.wikipedia.org/wiki/Domain_Name_System_blocklist

   The differences are that a DNSBL lookup uses the "A" rather than "PTR" record type, and uses a forward domain (such as dnsbl.example.net above) rather than the special reverse domain in-addr.arpa. There is an informal protocol for the addresses returned by DNSBL queries which match. Most DNSBLs return an address in the 127.0.0.0/8 IP loopback ...

5. WHOIS - Wikipedia

   en.wikipedia.org/wiki/WHOIS

   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 ...

6. Spam and Open Relay Blocking System - Wikipedia

   en.wikipedia.org/wiki/Spam_and_Open_Relay...

   This is a common method of pre-emptive blocking as most legitimate mail servers are hosted in data centers designed and provisioned for such services, the legitimate mail servers that are affected by such listings are most commonly home hobbyists running their own mail servers. The Spamhaus Policy Block List (PBL) is another such pre-emptive ...

7. List of websites blocked in the United Kingdom - Wikipedia

   en.wikipedia.org/wiki/List_of_websites_blocked...

   Specific address range(s) used by imgur.com Image hosting: Technical issue with content lock system EE: October 2013: 22 November 2013 (Technical problem resolved) WordPress.com: Several servers of wordpress.com Blog hosting: Mistake ISP(s) [36] 26 November 2013: 5 December 2013: Imgur: imgur.com Image hosting: Technical implementation [37] Sky ...