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Understanding Subnet Mask

How to Find Out Your Subnet Mask?
In a network environment where all the network devices are physically connected with each other and the ip settings including the subnet masks of all the devices have been configured. To view that what is my subnet mask you have to execute the following commands on the command line interfaces of different Operating System:

•ipconfig
This is the DOS command that executes the ip address and subnet mask of your computer that used any version of Microsoft Windows Operating System such as Windows 98, Windows NT, Windows 2000 and Windows XP.
•Ipconfig/all
This is the DOS command that executes the list of the ip address and subnet masks including some other network relating information of your Windows based computer.
•ifconfig
This is the case-sensitive Shell command that executes all the ip configurations including subnet mask of your Linux computer.
•Show ip
This is the command used to view the ip configuration settings including the ip address and subnet mask of the Cisco Catalyst 1900 Switch.
•Show ip interfaces
This is the command used for viewing the ip addresses and subnet masks along with other interface configurations of the existing interface in the Cisco Catalyst 2950 Switch and most of the routers such as Cisco 2500 Router and Cisco 2600 Router.