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Subnet Plus iPhone application Is a free Subnet Calculator for the Network Professional on the go.

Available on theAppStore

Updated for iOS 9, this IPv4 subnet calculator allows for the input of an IP address and subnet. It returns the number of hosts, subnet mask, wildcard mask,in dotted decimal format, binary and hex. For now the calculator is FREE! Give it a try. As we add functionality we will start charging for it.

Discover the App Play demo video

 

Customer Reviews from the App Store

Awesome app!

by Sparksr1
Just what I’ve been looking for.

Subnet Plus

by JDubb7x2
Awesome App!!!!

Great app

by Cisco Syd
A handy tool for those just learning or studying for CCNA or networking exams. Nice touch being able to save calculations!
I can’t wait to see the evolution of this fantastic tool!

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Save your subnet calculations into the built in database for easy reference later.

Available on theAppStore

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Why it is the tool all the cool Network Engineers use.

Available on theAppStore

What is a Subnet Calculator? Well for most Internet users it is of no use. So if you don’t know what a subnet is this is probably not the Calculator for you. If you have an idea of what a subnet is then maybe this is for you.

An IPv4 Internet address is a set of numbers written in dotted decimal format like 192.168.10.1. IPv4 Internet addressees are actually a 32bit Integers. The address is divided into two parts, the network number and the host number. The net mask is used to show the Network number. In the old days there where only three net masks 255.0.0.0 255.255.0.0 and 255.255.255.0 for A,B and C class networks. With the increasing number of hosts on the Internet a more effective scheme is used called Classless Inter-Domain Routing (CIDR). With CIDR you decide how many bits are being used for the network part. A old Class C address (255.255.255.0) is in CIDR notation /24 (i.e. the first 24 bits of the address is used for the network number)

So, what the Subnet Plus subnet calculator helps you do is divide a large network into smaller networks to give you more efficient use of IP addresses.

For example For example a address or 192.168.10.0 /24 has a subnet mask of 255.255.255.0. That subnet gives us 254 possible host addresses. The same address 192.168.10.0 with a /31 or subnetmask of 255.255.254 gives us a network of just 2 hosts.

Hopefully this will give you a general idea of how subnetting functions.

Discover the App Play demo video