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The name localhost is a commonly defined hostname for the loopback interface in most TCP/IP systems, resolving to the IP addresses 127.0.0.1 in IPv4 and ::1 for IPv6.As a top-level domain, the name has traditionally been defined statically in host DNS implementations with address records (A and AAAA) pointing to the same loopback addresses.
That means any packet sent to any of those addresses is looped back. The address 127.0.0.1 is the standard address for IPv4 loopback traffic; the rest are not supported by all operating systems. However, they can be used to set up multiple server applications on the host, all listening on the same port number.
::1 / 128 – The loopback address is a unicast localhost address. This address corresponds to 127.0.0.1 / 8 in IPv4. If an application in a host sends packets to this address, the IPv6 stack loops these packets back on the same virtual interface. fe80:: / 10 – Addresses in the link-local prefix are only valid and unique on the local subnet.
The Internet Engineering Task Force (IETF) has reserved the IPv4 address block 169.254.0.0 / 16 (169.254.0.0 – 169.254.255.255) for link-local addressing. [1] The entire range may be used for this purpose, except for the first 256 and last 256 addresses (169.254.0.0 / 24 and 169.254.255.0 / 24), which are reserved for future use and must not be selected by a host using this dynamic ...
The hosts file is one of several system facilities that assists in addressing network nodes in a computer network. It is a common part of an operating system's Internet Protocol (IP) implementation, and serves the function of translating human-friendly hostnames into numeric protocol addresses, called IP addresses, that identify and locate a host in an IP network.
Loopback (also written loop-back) is the routing of electronic signals or digital data streams back to their source without intentional processing or modification.It is primarily a means of testing the communications infrastructure.
1 SetCookie on Localhost with PHP and Apache. 2 comments. 2 ... 2 comments. 4 Urban Legends. 2 comments. 5 127.0.0.1 Security : Apache Servers. 1 comment Toggle 127.0 ...
These are typically created by functions from a particular extension, and can only be processed by functions from the same extension; examples include file, image, and database resources. [ 221 ] Arrays can contain elements of any type that PHP can handle, including resources, objects, and even other arrays.