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Carrier-grade NAT. Carrier-grade NAT (CGN or CGNAT), also known as large-scale NAT (LSN), is a type of network address translation (NAT) used by ISPs in IPv4 network design. With CGNAT, end sites, in particular residential networks, are configured with private network addresses that are translated to public IPv4 addresses by middlebox network address translator devices embedded in the network ...
In order to ensure proper working of carrier-grade NAT (CGN), and, by doing so, alleviating the demand for the last remaining IPv4 addresses, a / 10 size IPv4 address block was assigned by Internet Assigned Numbers Authority (IANA) to be used as shared address space. [1]
In effect, it is an (almost) stateless alternative to carrier-grade NAT and DS-Lite that pushes the IPv4 address/port translation function (and the maintenance of NAT state) entirely into the existing customer premises equipment NAT implementation.
The original list of IPv4 address blocks was published in September 1981. [3] In previous versions of the document, [19] [20] network numbers were 8-bit numbers rather than the 32-bit numbers used in IPv4. At that time, three networks were added that were not listed earlier: 42.rrr.rrr.rrr, 43.rrr.rrr.rrr, and 44.rrr.rrr.rrr.
Shared address space [4] for communications between a service provider and its subscribers when using a carrier-grade NAT 127.0.0.0/8 127.0.0.0–127.255.255.255
Dedicated space for carrier-grade NAT deployment. In April 2012, IANA allocated the 100.64.0.0 ... (Traditional NAT) RFC 3330 – Special-Use IPv4 Addresses ...
Category: IPv4. 5 languages ... Carrier-grade NAT; List of countries by IPv4 address allocation; E. IPv4 address exhaustion; H. Internet checksum; L. List of assigned ...
In ISP-level IPv4 NAT, ISPs may implement IPv4 network address translation within their networks and assign private IPv4 addresses to customers. This approach may allow customers to keep using existing hardware. Some estimates for NAT argue that US ISPs have 5-10 times the number of IPs they need in order to serve their existing customers. [95]