Why is it that '192.168.1.1' is often used in the router setting?

by Adrian Pratt

Although it is not all routers in the world, it is designed to access "192.168.1.1" by web browser when opening the setting screen with many routers. So, why this URL is "192.168.1.1", detailed answer is given at Quora of Q & A site.

What's the history behind 192.168.1.1? Why not started it? Used? Who started it? Why? Why? 1.1.1.1? What is the relation to 127.0.0.1? What about 10.0 .0.1 (Apple)? - Quora
https://www.quora.com/Whats-the-history-behind-192-168-1-1-Why-not-192-169-1-1-or-any-other-IP-address-When- What-is-the-relation-to-127-0-0-1-What-is-start-being-used-Who- about-10-0-0-1-Apple

On the Internet, the IP address for discriminating the equipment is usually expressed by a combination of four numbers from "0.0.0.0" to "255.255.255.255". And this IP address is divided into five classes.

First, the range from "224.0.0.0" to "239.255.255.255" is assigned as class D for IP multicast only, and the range from "240.0.0.0" to "255.255.255.255" is reserved for future use It is.

Of the remaining ranges, "0.0.0.0" to "127.255.255.255" are class A, "128.0.0.0" to "191.255.255.255" are class B, "192.0.0.0" to "223.255.255.255" are class C It is classified into.

For example, if 192.168.0.1, the IP address can be expressed as binary "11000000 10101000 00000000 | 00000001". Since this address is class C, the first 24 bits are the network part and the last 8 bits are the host part.

In class A, the most significant bit is set to 0, the following seven bits constitute the network part, and the remaining 24 bits constitute the address "0xxxxxxx | xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx". Therefore, up to 16,777,216 hosts can be connected in the network, but 126 networks are restricted as a network.

Class B has the address of "10xxxxxx xxxxxxxx | xxxx xxxx | xxxxxxxx | xxxxxxxx | xxxxxxxx | xxxxxxxx | xxxxxxxx | xxxxxxxx" whose upper 2 bits are set to 10, the next 14 bits are the network part, and the remaining 16 bits are the host part. This makes it possible to create 16,384 networks connecting up to 65,534 hosts.

In class C, the upper 3 bits are set to 110, the next 21 bits are the network part, and the remaining 8 bits are the host part "110xxxxx xxxxxxxx xxxxxxxx xxxxxxxx | xxxxxxxx". Although the number of hosts is as small as 256, the network can make 2,097,152 pieces.

Then, as private IP addresses, Class A is reserved as "10.0.0.0 - 10.255.255.255.", Class B as "172.16.0.0 - 172.31.255.255", Class C as "192.168.0.0 - 192.168.255.255" It is.

As the maker of the router which is the window of the Internet connection aimed at being able to connect as easily as possible, we set as the address of the router as possible as easy to remember as possible even among those reserved as private IP addresses. However, sub-network for the first and last address in the reserved for network and broadcast address, since 192.168.1.0 and 192.168.1.255 are excluded, it is often the "192.168.1.1", mean that is.

There is no clear answer as to which maker started using it, but Cisco engineer Saurabh Rai known as a network equipment manufacturer is expecting Linksys.

Since this is not stipulated as a rule, there are cases that "192.168.0.1" and "192.168.2.1" are available depending on routers.