Similarly if the final mask octet is 224, you have a subnet range of 31 addresses (255-224=31), and so on. If the subnet mask is 255.255.255.240 (for example), then the subnet will contain 15 addresses because 255 (all bits at 1) minus 240 equals 15.
#255 255 255 255 IP FULL#
On a single user dialup connection to the Internet, with a regular modem, you will receive one public IP address and it will have a subnet mask of 255.255.255.255 - indicating that you have only one address within your subnet.įrom the above you can see that an octet in the subnet mask of 255 makes things very easy - it means that the corresponding octet in the network address is 'fixed' and having a 0 (zero) means that the corresponding octet in the network address can vary the full range from 1 to 255. Put simply, wherever there is a 1 in the subnet mask, that bit of the network address cannot change and wherebever there is a 0 (zero) in the subnet mask, that bit in the network address can change. If you imagine that in binary, you can see how the mask works : A class C subnet has a subnet mask of 255.255.255.0. Note how the first three octets are always the same and only the fourth octet changes this is known as a "Class C" subnet. The Vigor router has a default private address range of 255 possible IP devices running from 192.168.1.1 to 192.168.1.255. The diagram below shows a typical IP address in binary and decimal formats if you are already confused or do not recognise this type of relationship (base con, we do not recommend that you read on. It is through the use of subnet masks and a network address that we can specifically identify each subnet (a specific range of IP addresses).
A subnet, exactly as the name suggests is a subset (a part smaller than the whole) of a larger network which can be specifically identifiable. You also need to understand what 'subnet' means. As a pre-requesiste, you need to be absolultely clear what binary is, and how binary relates to the four octets of an IP address in this guide, we assume you already are. IP Subnetting Understanding & Implementingįor a beginner, the concept of subnetting can be bewildering, but don't panic. For the very latest articles and new content for UK/Ireland users, please visit the Product Knowledgebase here Vigor Subnetting FAQ Note : This is the classic/original FAQ.
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