192.168.0.100 is another private IP address from the block of private addresses within class C (all the 192.168.x.x addresses belong to this block). Like many previous addresses we’ve talked about, this one is also used by some manufacturers like TP-Link, Netgear, D-Link, SerComm, and US Robotics as a default gateway address. This address is assigned to some routers, access points, IP cameras, print servers, and NAS devices and you can use it to access the setup (configuration) pages of these devices and adjust all kinds of settings (security settings – choosing different types of data encryption, wireless settings – setting SSIDs and passwords, DHCP pool settings, etc.). 192.168.0.100 can also be one of the available host IP addresses in case your router’s default IP address is 192.168.0.1 and the scope of available IP addresses spans from 192.168.0.2 to 192.168.0.244 (or even if you have a narrower scope). This address can also be a static IP assigned to a printer or to an IP camera, but you should be careful if it’s static and you should set a DHCP pool in a way that won’t cause an IP conflict (set the range of available IP addresses so that this specific static IP stays outside this range).
Rules of IP Addressing
As you probably know, IP addressing is what makes networking possible. Every device you use to access the internet or to communicate with other devices within your home or corporate network has an IP address which makes it identifiable. Without an IP address, other devices wouldn’t be able to see your device and communication would be impossible.
The IP address is a string made of 32 zeros and ones (32 bits) arranged in 4 octets with dots between these octets. Every octet can be decrypted into a number (any number from 0-255) and that’s what we use to write an IP address. Any given IP address is made of four numbers separated by dots and each of these numbers can be any number from 0 to 255 (for example – 192.168.0.100). The first IP address format (the one with ones and zeros) is called binary notation and the second is decimal notation. The set of rules that defines the format of an IP address is called Internet Protocol, specifically the fourth version of this protocol (IPv4). IPv4 defines all the other things related to IP addressing, too – it defines different classes of IP addresses, determines the blocks of private and public addresses, etc.
For a better understanding of this article, it’s really important to understand the purpose of private addresses since that one from the title is also private.
First of all, you should know that IPv4 protocol has to offer 4.3 billion unique IP addresses. In order to make the assigning process simpler, all these addresses are split into classes. There are 5 classes but only 3 are available for commercial use (other 2 are reserved). Since the number of people living on Earth and the number of different devices that need an IP address exceeds the number of available IP addresses within these 3 classes, some changes (tricks, if you want) had to be made. The first change was the introduction of blocks of private addresses. You see, IP addressing authorities realized that not all the IP addresses had to be routable (accessed through the internet). Anyone using a home computer or a phone doesn’t need his/her address to be routable which means that their devices have to have an IP address that’s unique only within a smaller network (unlike websites that must have a globally unique IP or public IP). That’s why blocks of private (non-routable) addresses were defined within the first three classes. One private address can be assigned to millions of devices in different parts of the world and they can all use it simultaneously without causing any conflict. That’s the beauty and the most important thing you should know about private IP addresses. They are one of the things that made IPv4 long-standing (this protocol has been in use for more than 40 years).
All the private IP addresses are equal and your devices will perform the same no matter what your IP address is. The reason why some private IP addresses are more recognizable (popular) is the fact that some router manufacturers assign these addresses to their routers. The manufacturers can choose any private address but those that represent the beginning of some scope of IP addresses are more often used than others (it’s just a logical thing, nothing more than that). On the other hand, you can see some manufacturers using 192.168.15.1 or 10.0.0.2. That proves the fact that the default IP address doesn’t have to be the beginning of a scope – it can be any private IP address.
Accessing Router’s Configuration Page
First of all, you should establish what’s your router’s default IP address. If you are certain that it is 192.168.0.100 then you are fine and we can continue, but if you are not, you can type in ‘’ipconfig’’ in the Command Prompt and see the ‘’Default Gateway’’ field. Now that we’ve established that 192.168.0.100 is your default gateway, you can use it to access the configuration (or setup, or administrative) page by entering this address in your browser (there is no preferred browser). After entering the right username and password (if you are performing the initial configuration, then enter the defaults – usually admin for both fields), the configuration page will open and you can start configuring your router and your internet connection.
IP Conflicts and How to Solve Them
Using 192.168.0.100 as a static IP can be tricky if you don’t make adjustments (or reservations) in the DHCP pool of available addresses. Let’s assume that you are using a router with a default gateway 192.168.0.1 and the DHCP server is set to assign IP addresses starting from 192.168.0.100 to different hosts connecting to the network. If you have an IP camera, or a printer using 192.168.0.100 as a static address by default and you don’t make a reservation in the DHCP pool, DHCP server will assign this address to your computer (or to any device that connects to the network first) and you will have two devices with the same IP address. That will make these two devices unable to communicate with each other and it will probably make your printer (or camera) unusable. This problem is known as an IP conflict. In order to avoid it, you will have to make a reservation in the DHCP pool. That way, the first IP address assigned to some client by the DHCP server will be 192.168.0.101 and there will be no conflict.
Hello, I am Anthony Stuart…
I am writer and editor at RouterInstructions. I’ve been working as a network specialist for various employers for almost 15 years. In my lifetime, I have installed thousands of routers, modems, bridges, switches, etc. My job also includes designing, monitoring, and maintaining local area networks (LANs) as well as wide area networks (WANs). I want to share my knowledge and experience with you and help you understand the basics of IP addressing. I am also going to write about routers, network security, and other network-related topics.