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What is subnetting? - Computers & Internet

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It's either managing a network of submarines, or it's a way of dividing your assigned range of IP-addresses into more than one "logical" network, so that you can define "rules" to keep the computers on one network from accessing the computers on the other network.

Posted on Mar 15, 2011

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Subnetting is a way of seperating your routers network into "Virtual" separate networks, placing whatever devices you have in each Subnet into their own separate network. Hope this helps!

Posted on Mar 15, 2011

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Static route for two different subnets


You did not say where are your two computers. Anyway, computers should work on most subnets routes except between 10.20.30.0 and 10.20.40.0 subnet.
Static routing should be set on two computers not on routers.
Assume computer A is connected to 10.20.30.252 Router A and Computer B is connected to router B.
On Computer A, you need to add route to -inet 10.20.40.0/24 via GW 203.187.106.147, and on computer B to set rotue to -inet 10.20.30/24via GW 203.187.106.138. That is all you need.

Apr 04, 2014 | D-Link Computers & Internet

Tip

How to Calculate an IP v4 Subnet


An IP address is a specific address assigned to a computer across a network, allowing computers to communicate with one another. When IP Version 4 debuted, there were far less computers on the web. IP v4 only contains 4,294,967,296 possible addresses, including subnet number and broadcast addresses. Now, there are many more devices on the web and because of this, subnetting (as well as NAT) was developed as a way of maximizing usable addresses.


The Parts of an IP Address:

IP addresses contain 4 octets, 8 bits each. For example,

192.168.1.1 in binary is

11000000.10101000.00000001.00000001


The Mask:

A Subnet Mask tells a computer what part of the address declares a subnet so it knows when the destination address is on the same network or needs to be routed to a different one. For example,

The subnet mask 255.255.255.0 in binary is

11111111.11111111.11111111.00000000

when applied to 192.168.1.1 or

11000000.10101000.00000001.00000001

The first 24 bits are the subnet. So, all addresses in 192.168.1.xxx are part of the same subnet. When a computer with address 192.168.1.2 wants to communicate with a computer with address 192.168.1.3 The information does not need to be routed because the computers are on the same network. However when a computer with address 192.168.1.2 wants to communicate with microsoft.com or 207.46.232.182, the data must be sent to the default gateway to be routed.

The area that is not covered by the mask (in this case, the last octet) are used by the network. The lowest possible number of .00000000 or 192.168.1.0 is the subnet number and the highest possible number of .11111111 or 192.168.1.255 is the broadcast address. These particular addresses cannot be issued to devices on a network. This leaves 254 addresses on 192.168.1.0 that can be assigned to devices on that network. The default gateway (the router) can be assigned any address in that space. However, it is typically assigned the first address (192.168.1.1 in this case)


One more example:

Ip address of 10.101.75.150 with subnet mask of 255.255.252.0 or,

IP:00001010.01100101.01001011.10010110
SM:11111111.11111111.11111100.000000000

00001010.01100101.010010 00.00000000 or 10.101.72.0 is the lowest address (aka subnet number) and

00001010.01100101.010010 11.11111111 or 10.101.75.255 is the highest number (aka broadcast address)

Any number in between is assignable to a device on the network.


The Easy Way (without binary):

Always look or the odd octet (the one that isn't 255 or 0) in the subnet mask.

255.255.252.000

in this case is 252. Subtract that number from 255 and you have 3 (or as I like to call it the magic number)

find the same octet from the IP address:

010.101.075.150
255.255.252.000

in this case is 75. Find the multiples of the magic number that this octet is between. In this case, 75 is a multiple of 3, so the numbers we are looking for would be 75 and the previous multiple 73.

So far we have,

10.101.73.xxx and
10.101.75.xxx

fill the X's for the low number with 0 and
fill the X's for the high number with 255 and you have,

10.101.73.0 (subnet number) and
10.101.75.255 (broadcast address)

All addresses in between are usable. As confusing as it all may sound, all takes is practice. "Practice makes perfect." Try making up your own IP address and Subnet mask and calculate the range to find the subnet number and broadcast address. In time you will have it down to a science.

on Nov 05, 2010 | Computers & Internet

Tip

How to figure out your default subnet mask


A subnet mask is a 32-bit binary number, very similar to an IP address. And like an IP address, the subnet mask is usually expressed as a set of four octets written in decimal form, with each octet separated by a period.

The subnet mask is used by routers and switches to determine which part of a computer or other device's IP address is the network identifier, and which part is the host identifier. There are three default subnet masks, one for each of the IP classes A, B, or C. The default subnet masks are:

Class A = 255.0.0.0
Class B = 255.255.0.0
Class C = 255.255.255.0

To determine the default subnet mask for your network, all you need to do is see which class your network falls into. A network's class is assigned based on the first octet (the set of digits before the first period) of the IP address. For example, to find out which class the network 123.22.8.0 belongs to, you would see where "123" fits into the following table:

First Octet: Class:
1-126 = Class A
128-191 = Class B
192-223 = Class C

So for the example above, 123.22.8.0 is a Class A network, which means it would have a default subnet mask of 255.0.0.0.

Most home and office networks will be Class C networks, so your default subnet mask will typically be (you guessed it) 255.255.255.0. Not all networks use the default subnets, but for those that do, figuring it out is easy once you know which class your network fits into.

on Jun 23, 2010 | Computers & Internet

1 Answer

How do i establish a subnet with a A address


The subnet is determined by the subnet mask. Class A addresses are contained in the following range: 0.0.0.0 - 127.255.255.255. The most common use of a class A address is 10.0.0.0

In class A networking you may use a subnet mask from 255.0.0.0 all the way to 255.255.255.255

The subnet would work as the following example:

Network Address: 10.x.x.x
Subnet mask: 255.0.0.0

The first number in the above example would determine our subnet. So if you have 2 devices and you would want to put them in a different subnets you would want the first octet (octet is each number seperated by periods) to be a different number.

Network 1: 10.x.x.x
Network 2: 11.x.x.x

Unless these devices use a router to communicate they would not "talk" properly. Thus giving you 2 different subnets.

Oct 24, 2013 | Computers & Internet

1 Answer

I can not get it to work at all. Is there a CD I need to get this set up? I have a Linksys wireless G router and the Belkin F5D7130 plugged in to it. But I have no range.


You don't need a CD - there is a web interface. First, download the user manual here.

I suspect your problem is the Linksys/Belkin combination. Linksys by default uses a subnet of 192.168.1.xxx while Belkin uses 192.168.2.xxx. With a subnet mask of 255.255.255.0 (the default for both), no communication would be possible between these two subnets. The "255" in each of those first three octets means they must match exactly.

Either move the Linksys to 192.168.2.xxx or the Belkin to 192.168.1.xxx (and keep the same subnet mask) OR you can change the subnet mask to a broader one (255.255.254.0) that allows the two different subnets to talk to each other. This subnet mask would have to be applied to both devices.

According to the manual, the default address of the Belkin is 192.168.2.254, which leads to your next problem - your PC probably can't connect to the Belkin device. Assuming your PC is configured for the Linksys subnet, the easiest way to communicate with the Belkin is to use a network cable directly linking your PC to the Belkin (may need to be a crossover cable) and manually set your PC's IP address to one in the same subnet as the Belkin, like for example 192.168.2.200 with a subnet mask of 255.255.255.0. Then you can open your web browser and point it to the Belkin default address, as outlined in the manual, and make whatever changes are required.

Feb 21, 2011 | Belkin F5D7130 And F5D7010 (Bundle)...

1 Answer

I have a WNDR3400 and it serves DHCP IP addresses in the range of 192.168.2.x subnet. The routers is connected to the another local subnet 192.16.1.x I want the computers on the 192.168.2.x to be...


You need to set the subnet mask correctly on the machines so the machines can see traffic on both subnets. If DCHP is issuing the IP address of each subnet, it's also issuing the subnet mask. You should be able to configure both routers to issue a subnet mask of 255.255.0.0 and that would give your computers on either subnet visibility to both networks. Make sure to configure only one of these routers as the gateway and make sure both routers agree which one is the gateway to the Internet otherwise some of the computers won't have Internet access.

Jun 30, 2017 | NetGear WNDR3400 N600 Wireless Dual Band...

2 Answers

How do i establish a subnet with a B address


Subnet mask for 86 PCs is more than 64 and less than 128. it means that subnet mask is 255.255.255.128
You can have PC IP address in range 172.31.0.129 - 172.31.0.254

Apr 21, 2010 | Computers & Internet

1 Answer

What is subnet


A "subnet" is a segmented portion of a TCP/IP network. For example, if your main network is 192.168.0.0, a "subnet" would be 192.168.5.0. Notice the 3rd octet (the zero after 168) is 0 on the main network, and 5 on the subnet.

Feb 22, 2010 | Microsoft Windows XP Professional for PC

1 Answer

You need to subnet a network that has five subnets,each with at least 16 hosts.which classful subnet mask would you use?


255.255.255.224

224 = 11100000

Your networks would be 192.168.1.0/32/64/96/128/160/192/224

This will allow 8 subnets with 30 useable hosts in each.

NOTE: 255.255.255.240 WILL NOT WORK. It will have 16 IPs in each subnet, but remember you only have 14 useable. One will be the network number and the other will be the broadcast IP.

Dec 20, 2008 | Audio Players & Recorders

1 Answer

Daisychaining subnets?


It is not recommended to daisy chain subnets because the flow of information is slowed as well as transfer of information But if done properly by using routers as well as correctly identifying the flow of information with the use of static routing then that is the correct way of daisy chaining subnets.

Nov 26, 2008 | Computers & Internet

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