Free subnet software for windows

CiscoKits CCNA Subnet Calculator 1.0 is one of the most marvelous Calculators with which you can download and use to help you prepare for your Cisco certification exams.

Subnetting is one of the key concepts on the Cisco CCNA certification exam. So you need to know it inside and out. This ulitity will help you understand and verify that you know subnetting the Cisco CCNA way. Features: Classful Subnet Calculator - This can create your subnet results based on many different options such as: subnet mask, mask bits, most bits, number of subnets and hosts per subnet and then it gives you the ability to export all this data and more.

Classless Inter-Domain Routing (CIDR) Calculator - includes full support for CIDR. Use of CIDR addresses reduce the size of routing tables and make more IP addresses available within organizations. This CIDR classless subnetting feature is particularly useful for ISPs, colleges, or large corporations with many Class C addresses. Again, they give you the ability to export this data so you can work with the data to meet your requirements. Subnet Addresses - You can generate a list of addresses for any subnet, which then becomes the working document from which to assign current and future IP addresses.

IP Subnet Calculator for IPv4 and IPv6 1.02 is created as a useful product which can compute IPv4 masks and host subnet ranges. Input an IP address and choose one of the following: number of subnet bits, the maximum number of desired subnets, the number of host bits, or the maximum number of desired hosts. The calculator gives you a bit-by-bit address visualization and generates a complete table of subnets. CIDR allows multiple IP routes to be aggregated into a smaller set of routing table entries. Just as with subnetting, the calculator makes it easy visualize and generate CIDR information. The calculator is the first to support IPv6.

Although there are no subnets in IPv6 per se, there are several different types of IPv6 addresses and bits/fields within those types have different interpretations. Enter an IPv6 address and classify and dissect it for you. The calculator automatically discovers locally configured IPv4 and IPv6 addresses, allowing you to quickly classify and dissect them. The information presented in the calculator is a mere cut-and-paste away into your favorite application.

What this is useful for if you are trying to debug some specific network behavior. I have personally spent hours running a system that was having mysterious network issues through its paces, keeping a journal entry of timestamps and actions-performed-by-user in order to correlate the two later.

Later, when correlating the two, you find out that your timestamps dont quite match, so it becomes difficult to isolate border-case traffic. The ideal dummy host for you to aim this utility at would be a living ip address on your current subnet. This will do two things. One, it being on your subnet will make sure that you arent routing wonky discard packets to other parts of the network and generally pissing people off.

Two, it being alive will make sure that windows sends the packet out... Believe that if it is a locally routable address and there is no arp entry for that IP address, the message will never be sent out or seen in the sniff.