The IPv4-mapped IPv6 address format allows the IPv4 address of an IPv4 node to be represented as an IPv6 address. The IPv4 address is encoded into the low-order 32 bits of the IPv6 address, and the high-order 96 bits hold the fixed prefix 0:0:0:0:0:FFFF.
There is a distinction between private and public IP addresses. To enable communication with the Internet, a public IPv4 address is mapped to the primary private IPv4 address through network address translation (NAT). 113.138.138.33 is an IPv4 address. Find-ipv6.com can convert any IPv4 address to an IPv6 addres. 113.138.138.33 is converted to IPv6 ::ffff:718a:8a21 This unallocated address space is called the bogus space. Bogons also include reserved private address and the link local address ranges (Martian Packets). IANA might assign Bogon IP addresses to an entity or RIR with the passage of time. Here are the bogon IP address ranges: When IPv6 global-unicast addresses are unavailable in a network and there is a need to pass IPv6 traffic, typically, IPv4-mapped IPv6 addresses are assigned based on the existing IPv4 address assignments. However, this could cause a difference in the IPv4 and IPv6 next-hop information, and result in unexpected exclave of the IPv6 subnet.
This is a mapped address allowing IPv6 tunneling through IPv4 NATs. The address is formed using the Teredo prefix, the server’s unique IPv4 address, flags describing the type of NAT, the obfuscated client port and the client IPv4 address, which is probably a private address. It is possible to reverse the process and identify the IPv4 address
Find and trace your IP (Internet Protocol) Address using this tool. An IP is a unique identifier for your network connection. View your IPv4 and IPv6 address. The mapped address format is used to represent an IPv4 node. The only currently defined use of this address format is part of the socket API. An application can have a common address format for both IPv6 addresses and IPv4 addresses. The common address format can represent an IPv4 address as a 128-bit mapped address. May every IPv6 address be written as an IPv4-mapped IPv6-address? If not, what are the exact rules for correctly writing an IPv4-mapped IPv6-address? So can every IPv6 address be written in the format of: x:x:x:x:x:x:d.d.d.d Afterwards applying the compression for IPv6 text representation to the hexadecimal part. --enable-v4-mapped is the default on all platforms except FreeBSD, NetBSD, and OpenBSD, so this is probably how your httpd was built. If you want httpd to handle IPv4 connections only, regardless of what your platform and APR will support, specify an IPv4 address on all Listen directives, as in the following examples:
113.138.138.33 is an IPv4 address. Find-ipv6.com can convert any IPv4 address to an IPv6 addres. 113.138.138.33 is converted to IPv6 ::ffff:718a:8a21
IPv4-mapped address ^ Like the loopback address, IPv4-mapped addresses are only used for internal representation on a host. They allow developers to use one API for both IPv4 and IPv6 calls. The syntax of IPv4-mapped addresses looks like this: :FFFF:w.x.y.z, where "w.x.y.z" is the IPv4 address that is represented in the IPv6 address. 6to4 Nov 11, 2019 · The basic mapping rule is used by the MAP-T CE to configure itself with an IPv4 address, an IPv4 prefix, or a shared IPv4 address from an IPv6 prefix. The basic mapping rule can also be used for forwarding packets, where an IPv4 destination address and a destination port are mapped into an IPv6 address/prefix. This way the 6PE routers convey their IPv4 address as the BGP next-hop for the advertised IPv6 prefixes. The IPv4 address of the egress 6PE router is encoded as an IPv4-mapped IPv6 address (::FFFF: