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This is a list of countries by IPv4 address allocation.. The Internet Assigned Numbers Authority (IANA) distributes large blocks of addresses to regional Internet registries (RIRs), which then assign them to national Internet registries and local Internet registries within their respective service regions. [1]
Chinese Firewall Test - Instantly test if a URL is blocked by the Great Firewall of China in real time. Tests for both symptoms of DNS poisoning and HTTP blocking from a number of locations within mainland China. China Firewall Test - Test if any domain is DNS poisoned in China in real-time. DNS poisoning is one way in which websites can be ...
The platforms display the province for users located in China or the country or region if the IP address of the user is located overseas. Users cannot disable this feature. [17] [18] China's special administrative regions of Hong Kong and Macau are outside the Great Firewall. [19]
A local Internet registry (LIR) is an organization that has been allocated a block of IP addresses by a RIR, and that assigns most parts of this block to its own customers. [11] Most LIRs are Internet service providers, enterprises, or academic institutions. Membership in a regional Internet registry is required to become a LIR.
This means that 256 /8 address blocks fit into the entire IPv4 space. As IPv4 address exhaustion has advanced to its final stages, some organizations, such as Stanford University, formerly using 36.0.0.0 / 8, have returned their allocated blocks (in this case to APNIC) to assist in the delay of the exhaustion date.
This is especially frequent in places such as China. [4] [5] Internet users may circumvent geo-blocking and censorship and protect their personal identity using a Virtual Private Network. [4] On a website, an IP address block can prevent a disruptive address from access, though a warning and/or account block may be used first.
The list includes wide networks of computers sharing the same IP address using network address translation which are also affected (If one computer behind the NAT is allowed to send spam, the whole network will be blacklisted if the NAT IP is ever blacklisted.) This is a common method of pre-emptive blocking as most legitimate mail servers are ...
A postal code or yóu biān (邮编) in a subordinate division will have the same first two digits as its governing one (see Political divisions of China. The postal services in Macau or Hong Kong Special Administrative Regions remain separate from Mainland China , with no post code system currently used.