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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 ]
A country code top-level domain (ccTLD) is an Internet top-level domain generally used or reserved for a country, sovereign state, or dependent territory identified with a country code. All ASCII ccTLD identifiers are two letters long, and all two-letter top-level domains are ccTLDs.
A regional Internet registry (RIR) is an organization that manages the allocation and registration of Internet number resources within a region of the world. Internet number resources include IP addresses and autonomous system (AS) numbers.
These databases typically contain IP address data, which may be used in firewalls, ad servers, routing, mail systems, websites, and other automated systems where a geolocation may be useful. An alternative to hosting and querying a database is to obtain the country code for a given IP address through a DNSBL-style lookup from a remote server.
A national Internet registry (or NIR) is an organization under the umbrella of a regional Internet registry with the task of coordinating IP address allocations and other Internet resource management functions at a national level within a country or economic unit.
"IANA IPv4 Address Space Registry". Internet Assigned Numbers Authority (IANA). 21 December 2017 The authoritative up-to-date list of IANA assignments. "ARIN Whois Database". American Registry for Internet Numbers (ARIN) Historical IP address lists: "INTERNET PROTOCOL ADDRESS SPACE".
An Internet Protocol address (IP address) is a numerical label such as 192.0.2.1 that is assigned to a device connected to a computer network that uses the Internet Protocol for communication. [1] [2] IP addresses serve two main functions: network interface identification, and location addressing.
Map of geographic dialing codes. These tables list the dialing codes (area codes) for calling land lines for various cities and districts in Japan, when dialing from within Japan. The leading 0 is omitted when calling from outside Japan. Cell phones use the dialing codes of 070, 080 or 090. IP-based phone services use the 050 dialing code.