Knowing how an IP address identifies a host on a network can be confusing. Before you begin calculating various addresses, you should know the fundamentals of IP addressing. Todd Lammle describes this ...

Internet Protocol (IP) addresses take the form xxx.xxx.xxx.xxx, where xxx (an octet) is a number from zero through 255. There are public IP addresses and private IP addresses. Public IP addresses are ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Table 1. This table illustrates subnet masks. The number after the “/” in the CIDR notation ...

I got sick of spending time converting IP addresses to various formats. ipconv.pl is a quickie CGI shortcut to convert a dotted-quad IP address to decimal, hex, octal and binary.

An IP address is a 32-bit unsigned integer. It’s usually written as four numbers separated by dots, as in: 212.227.196.186. This format is knows as the “dotted decimal notation”. Applications use ...

We just saw that the mask determines where the boundary between the network and host portions of the IP address lies. This boundary is important: If it is set too far to the right, there are lots of ...