In the output, you can see a “lo” interface. There is a command ( ifconfig) in Linux, which you can use along with the option “-a”, to display the interfaces.
In this tutorial, we are using Linux operating system to demonstrate the example. In an operating system, there are commands and utilities to list the IP addresses.
#LOOPBACK ADDRESS HOW TO#
How to check the loopback address and associated domain names? For IPv6 the loopback address is ::1 and the domain name is localhost6.For IPv4 the loopback address is 127.0.0.1 the domain name is localhost.The loopback addresses are mapped to the “ lo” interface. This is a software interface that does not have any associated network hardware. What are the loopback addresses for IPv4 and IPv6?Īn operating system has a loopback interface named “ lo”. Each address is 16 bytes long, so a total of 2^128 are possible addresses with the IPv6 address scheme. IPv6 is a newer version with a much larger IP address space. At the start of the internet, the number looks pretty good to hold the IP addresses of all devices worldwide.īut this range will not be sufficient as the number of devices increasing day by day, mainly after the Internet Of Things (IoT) came into the picture. You can have a maximum of 0xFFFFFFFF number of values. IPv4 is the older version, where each address value is four bytes long. The IPv4 and IPv6 are the versions of the network addresses. If a network client program sends a packet to the loopback address, the operating system routes the packet back to the userspace.
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