#Firewall builder ip address table ranges full
It is not necessary to use the full 8 bits of each value if we don't want to. The total number of bits we cannot use for individual computers = 24 The total number of bits we cannot use for individual computers = 8 A network mask is effectively the binary digits that are NOT available for us to use to uniquely identify computers.
If we cannot use the first value in our dotted quad, then we have only 3 values of our dotted quad remaing to uniquely identify computers. We would NOT put a computer identifed as "94.97.123.2" on that network, because it doesn't start with a "10". In other words, one of the dottect quad values ("10") CANNOT be used to uniqely identify a computer because all addresses on that network start with the same value ("10"). That leaves three "x" values that can be used to uniquely identify a single computer. In our first example, only the first value is fixed "10". The Netmask defines the number of bits that CANNOT be used to represent a host IP address. In this case, "10.10.10" is fixed, and "x" can be any number from 0-255. In the network 10.10.10.0, all information destined for computers or devices with an IP address of 10.10.10.x would be delivered to the same network space. In our example network, the first "10" is fixed and each "x" can be any number from 0-255. the largest number that we can represent using eight binary digits is 255. Each value is only a single byte long, which means 8 bits which means that only numbers that can be represented by eight bits (ones and zeros). The remaining three values (x.x.x) can be anything we want. In this case, the first number of the dotted quad ("10") is fixed and cannot change. In the network 10.0.0.0, all information destined for any computer or device with an IP address of 10.x.x.x would be delivered to the same network space, where it would eventually find it's way to it's destination.
#Firewall builder ip address table ranges how to
IP4 Networks are set up to use four one-byte values to figure out how to move information from one place to another. The computer sees these values as binary numbers. This representation is called dotted-quad notation.Įach byte contains eight (8) bits. Those four bytes are most commonly displayed as four decimal numbers separated by a period ("."). I'll fix it up over time.)Īn IP address is a set of four (4) bytes that identify a unique host address.
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