Blank Subnet Mask Table: A Simplified Guide

In the world of networking, subnetting is a crucial concept that enables routers to efficiently route packets between different networks. In this article, we'll delve into the basics of subnetting and explore how to create a blank subnet mask table.

Understanding Subnet Masks

---------------------

A subnet mask is a 32-bit number that separates the network address from the host address in an IP address. It's used by routers to determine which part of the address belongs to the network and which part belongs to the host. A subnet mask can be written in dotted decimal notation, with each octet (group of eight bits) separated by dots.

For example, a common subnet mask is 255.255.255.0, which represents a /24 prefix. This means that the first three octets (the network address) are fixed, and the last octet (the host address) is variable.

Blank Subnet Mask Table

----------------------

Now, let's create a blank subnet mask table for a given network address and subnet mask. Suppose we're working with the network address 192.168.100.0/24 and the subnet mask 255.255.255.192. We can start by identifying the number of subnets and hosts each subnet can support.

* Number of bits in the subnet mask: 26 (since it's written as /26)

* Number of ones in the subnet mask: 6 (since there are six octets with all ones)

Using these values, we can create a blank subnet mask table:

| Subnet ID | Network Address | Host Range |

| --- | --- | --- |

| ? | 192.168.100.0/26 | ? |

To fill in the table, we need to perform some calculations. Since there are four subnets (2^6), each subnet can support 64 hosts (2^6). The first three octets of the network address remain the same for all subnets, so we only need to determine the fourth octet.

For example, if the destination IP address is 204.13.31.69, as mentioned in the text, we can use the subnet mask to determine which subnet it belongs to. By applying the subnet mask, we find that the first two bits in the fourth byte are 01. This indicates that the packet belongs to the second subnet.

-------

In this article, we've explored the basics of subnetting and created a blank subnet mask table for a given network address and subnet mask. By understanding how subnets work, you'll be better equipped to design and manage your own networks. Remember, the key phrase '/?' at the end of a subnet ID is an effective method of identifying the number of subnets and their hosts.

By following these steps, you can create your own blank subnet mask tables for any given network address and subnet mask. Happy networking!

Blank subnet mask table