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How to get the number of subnets on the IP address

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  • Phil
    Phil Mar 21, 2011

    You need to know the subnet mask. What is it?


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I think the easiest way is to use an on-line IP SubNet Calculator, like one below:

Hope this helps

Posted on Mar 21, 2011

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Connect fuji xerox printer - mac pro computer as it was

Hi Lindsay. Was the fuji xerox printer plugged into the old modem by a blue ethernet cable ?
When you changed your modem it would have had a device inside it called a dhcp server that allocated the IP addresses to your computers automatically.
Now I suspect that the new modem has a device inside it called a DHCP server that is allocating a different range of IP addresses to your computers from waht it used to be.

Here comes the technical part
On the printer menu screen there should be a network setting option . Take a note of the IP address of the printer it will be 192.168.0.x or 10.0.0.x x being the unknown number. also take a note of the subnet mask . it will most likely be
next but I have no idea how to look that up on a MAC IOS system.
you may see the ip address in the printer settings properties in the MAC
you may be able to get your ISP to remotely set up your DHCP server in your router to work in the appropriate ip range to match your printer IP address and to avoid allocating the printers ip address to your computers. Then restart the computers to get new ip addresses.
If you tell them the printers IP address and Subnet mask they should be able to alter the modem's settings DHCP settings for you.

The other option is to get the DCHP IP address range of the modem and subnet mask and change the printers IP address setting and subnet mask to match the DHCP leases range by giving it a much higher number than the computers are most likely to be running on.
so if the range was to with subnet mask of then the printer would be set to and subnet mask The first three left numbers must match they are known as the network component of the ip address or it may be the zero end number is the network address so you can't allocate it to a device. or is usually the modem address.
ISP may be able to guide you how to change the setting on the printer .

I had a client that had a lot of trouble getting a tech to come out and set up their printer to an APPLE system. I was the final Tech that eventually came out and set up the printer .

Feb 17, 2016 | Computers & Internet


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, in binary is


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 in binary is


when applied to or


The first 24 bits are the subnet. So, all addresses in are part of the same subnet. When a computer with address wants to communicate with a computer with address The information does not need to be routed because the computers are on the same network. However when a computer with address wants to communicate with or, 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 is the subnet number and the highest possible number of .11111111 or is the broadcast address. These particular addresses cannot be issued to devices on a network. This leaves 254 addresses on 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 ( in this case)

One more example:

Ip address of with subnet mask of or,


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

00001010.01100101.010010 11.11111111 or 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.

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:

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, and

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


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 =
Class B =
Class C =

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 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, is a Class A network, which means it would have a default subnet mask of

Most home and office networks will be Class C networks, so your default subnet mask will typically be (you guessed it) 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

Sub net number for connestionwhat is it

Typically, small LAN subnet values in homes is:

Assume a router with a IP address. If all your devices are have have the same 192.168.X prefix, and only the last value would change ie: 2, 4, 145, 210, etc. like,,, and so on.

If you have devices connected with IP addresses assigned to 192.168.2.X, the subnet would need to be:

Have a look here for more help:

Dec 19, 2014 | Apple Ipad I-pad

1 Answer

My new WRT160N Linksys won't connect ATT Motorola 2210 DSL Modem

For AT&T default IP address for the Motorola modem is
Default for the Linksys IP address is

Have you changed either one? For them to work correctly they need to be in different subnets. An IP Address of 192.168.y.xx, where y is the subnet and a different number for each device, usually 0, 1, or 2.

If they are in the same subnet, change the modem'smag-glass_10x10.gif IP to or Once you do this you will need to use the new address to access the modem.
You should make sure the router'smag-glass_10x10.gif gateway is outside the DHCP rage of the modem.

Dec 06, 2010 | Linksys WRT160N Wireless Router

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Hi. i cant connect to print server d-link dp301p+ IP to configure it?! who knows what IP by default it have? doesnt work... Thanks, Mike

First find out the IP address , Subnet mask,and Gateway addresses of your ISP ( Internet Service Provider ). According to above addresses, you have to complete the network settings of your printer by mentioning the different IP address .

To find out the above mentioned addresses, first open the control panel -> network connections -> local area connction -> properties -> Internet Protocol Version 4(TCP/IPV4) OR Internet Protocol Version 6 (TCP/IPV6)according to your ISP -> Properties

By the systematic selection as mentioned above you will get the IP address, subnet mask and Gateway addresses.

Suppose your IP address is , the gateway may be Or any number. And the subnet mask may be XYY.XYY.XYY.0.

According to your ISP addresses you have to complete the network settings of your printer. First press the additional functions -> system settings -> network settings -> TCP/IP settings -> fill up the addresses as follows.

IP address : OR any number .

subnet mask : XYY.XYY.XYY.0.

Gateway :

Hurray ! the problem about your network connection with the printer to your computer will be automatically solved.

Sep 28, 2010 | Computers & Internet

1 Answer

I can't get my computers to talk to one another through sonicwall and Im wondering what could be the issue

THere are many things you must be fully educated on like DNS, IP numbering and subnet masking for different networks (for the different sites), TCP Port and Protocol (UDP, TCP) knowledge for different TCP services (you have to know what you want each network to have access to) and Public Key Private Key methodology, IPSec, PPTP and Routing.

THere are many things that can go wrong. FOr instance in your particular case I would assume that your router is not configured to utilize groups of users and then assign those same groups to different traffic templates. YOu need to make sure that your four locations are assigned a particular traffic pattern. Most allow what the other gentleman spoke of "remote access" but you need more of a open network amongst authenticated users.

Routers of this class generally work by allowing you to assign traffic to a very specific Port and direction assignment. For instance simply - http traffic is always on port 80. If you wanted your users to have internet HTTP connectivity you must assign port 80 incoming and outgoing to those users and assign that traffic to internal and external IP addresses by using Network Address Translation on the IP address of the external network. YOu also want to make certain that your Gateway for the remote users are using their own internet service provider account because sometimes uneducated people setup the internet access to be routed to the external ip adddress on the home router. In this situation you would have a remote user dialing the home office and then requesting an internet page from that External network, only to have that traffic then come back to the home router and then out again over the vpn to the remote location. All internet traffic should be routed to the local gateway of that locations provider. THose remote routers will allow this and then only file sharing and printing and other critical network services should be routed over the VPN itself.

As I said it is very complicated and I would definitely pay someone to do this for you and then walk you through basic configuration issues while they are there. You would probably pay in the neighborhood of about 100-150 an hour but for this level you would be getting a certified and knowledgable person. You could also call SonicWall and have them walk you through it for a fee. Watchguards fee is 500.00 to 1000.00 depending on sophistication.

I am sure this only confused you more but IP Routing and VPN traffic routing is difficult and even people who have been in this industry for a very long time find it difficult. You have to be in it and doing it all the time for it to come second nature. I believe your IP addresses are on completely different subnets or ranges. That is another place to start. You really need to setup your internal networks at all locations on the SAME NETWORK in order for them to speak to one another. is one network that is publicly unroutable or or These are common netoworks.

I'll try to give you a short lesson this. subnet masks (the number under the ip address in the networks section allows you to segment your traffic to only communicate to a certain NUMBER of computers.

An IP Address of with a subnet mask of gives you zero computers. If you move the subnet mask to you get 4 ip address but only 2 computers that can talk to one another. THe ip address in this configuration would be,, and The first ip address of any given network is ALWAYS the network address and should not be used ( the next two ip address can be assigned to computers and the last ip address is always a "Broadcast" address for the network to speak on.

YOu could have started with another number to begin with for instance subnet mask 255.255.252 and the same methodology would apply. is the network, and 56 are the computer addresses and is the broadcast address.

If you want to have multiple computers at different locations you must all be on the same network with the same IP addressing scheme.

AN example subnet mask of would give you available address of 254 computers but 256 addresses (including zero).

The subnet masks are as follows for this network above (maybe you can use this)

Zero Computers only a network address and a broadcast address. Remember you only have 256 addresses in a range and the first is network and the last is broadcast so in this configuration you have and (only two addresses)

Two Computers and with network of (first IP number) and broadcast of (last IP Number) only two usable addresses but FOUR ip addresses.

Six computers with IPS of to Network of dot zero and broadcast of dot seven (

fourteen address to
network .0, broadcast .15

subnet of 255.255.224
thirty computers to
network of .0 and broadcast of .31

subnet of 255.255.192
sixty two computers 111.1 to 111.62
network of .0 and broadcast of .63

subnet of 255.255.128
One hundred twenty six computers 111.1 to 111.126
network of .0 and broadcast of .127

subnet of 255.255.0
Two hundred fifty four computers 111.1 to 111.254
network of .0 and broadcast of .255.

THis is one reason the actual computers wont talk to one another probably. ALL computers on the VPN must talk on the same Route or be ROUTED with the routers routing of networks options. to make the traffic move from one network to another.

May 03, 2009 | Computers & Internet

1 Answer

What is a submit adresse

it is called a subnet address and is simply a method of deviding up networks ... the subnet mask tells the ip network how to treat the ip address ... an ip address is made of of two parts ... the network portion which is common to all the devices within the network and the client portion which is unique to all the devices in the network ... if we want to have a network that can support 254 devices we use a subnet mask of on a 10.10.10.y network which resolves to a x.x.x.y network... the x.x.x is the network address i.e 10.10.10 and the y is the client number which can be any number from 1 to 254 ... clear as mud

Mar 21, 2008 | Computers & Internet

1 Answer

Low lan connectivity or limited lan connectivity

Hello Sir,

all computers on the same physical subnet need to have ip addresses in common
meaning the first three numbers in aaa.bbb.ccc.ddd are the same and are different only in the ddd portion.
In addition, the subnet mask must be alike or ensure that some ip addresses are not excluded
Typical subnet mask is or sometime
Usually, there's a gatway address; a target which is used to send packets out
of this machine and hopefully towards the other machine.

For all machines, use the Run->cmd and enteripconfig /allYou should have similar results on all machines, so look for major differences eg: gateway on one is or not shown while other have non-zeros,
or ip address on one start 169.254 another starts with 192.168

The 169.254.y.z addresses are pecuilar

ms article comments on auto-config:
example : IP-address assigned via Auto-IP-Configuration :
Windows IP Configuration
Ethernet adapter Local Area Connection:
Connection-specific DNS Suffix . :
Autoconfiguration IP Address.. . . :
Subnet Mask . . . . . . . . . . . . . .:
Default Gateway . . . . . . . . . . . . :

Good luck

Feb 29, 2008 | Computers & Internet

2 Answers

Adding additional computer problem

Yes, the xp machine connects to the net. DHCP is not enabled. The ipconfig/all command brings up the correct static ip address, subnet mask, and default gateway. But it does also say under the ip configuration that ip routing is not enabled. I did have the 2000 machine connected when I first set up the router yesterday, but I booted up my laptop to try to set up a wireless connection, and then I had to reinstall the entire router set-up.

Jan 12, 2008 | Linksys Wireless-G WRT54G Router

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