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Questions tagged [subnet]

A subnetwork, or subnet, is a logically visible subdivision of an IP network. The practice of dividing a single network into two or more networks is called subnetting and the networks created are called subnetworks or subnets.

A subnetwork, or subnet, is a logically visible subdivision of an IP network. The practice of dividing a single network into two or more networks is called subnetting and the networks created are called subnetworks or subnets.

Subnetting provides a way to use the number of IPv4 addresses in an optimal way. The previous notation with classes caused a lot of IP's to remain. In the beginning this was not a problem, but these days IPv4 addresses have already depleted at the top level.

Source: wikipedia

Tutorial on subnetting

896 questions
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Is there such a thing as too many IP addresses?

We've started a small debate in the office, and I've hit the point where I no longer have the technical knowledge to continue. Is there such a thing as having too many IP addresses? I'm not suggesting we use the entire private 10.* Class A, but I…
VxJasonxV
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Can I determine a computer's subnet using ping-type tools?

I know I can ping a server name and determine the IP address. But are there commands I can use to determine the subnet? I'm using Windows XP.
Jim
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Basic subnetting question

I've been going over my notes for subnetting, and realised I don't really understand it. Have read this fantastic question which cleared up a lot: How does IPv4 Subnetting Work? However, I'm still stuck. Takes this scenario for example: Assume you…
Dominic Bou-Samra
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How to find the common supernet between two networks?

Imagine I have two networks: 192.168.20.0 192.168.21.0 How can I find the common supernet to give to a router so any external router can access these two network by using only the supernet address?
Sergio Tapia
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Any reason not to use 10.X.0.0/16 subnets (VLANs) on SMB private network?

We are currently primarily using a 10.1.1.0/24 subnet at our small company (~250 employees, ~90 computer users). We're seriously considering doing some VLANing / network segmentation and isolation, and we're very close to too many devices on our…
Adam Nofsinger
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Can I use a subnet mask to limit the number of users on a router?

(I'm not a network guy, so please humor me.) I want to configure a typical consumer router as an open hotspot. However, the router's internet connection has limited bandwidth. Therefore, I'd like to limit how many people can connect to it…
Nathan Long
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Is subnetting still needed with switches instead of hubs?

I've been reading about subnetting on a few stack exchange sites and others that I found online but the majority of posts seem to contain outdated responses such as class networks etc. So to my knowledge, subnetting is used to make traffic easier to…
Simon P
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How to use multiple IPs on dedicated server?

I have this dedicated server with /29 IPv4, and I would like to know how to use all the IPs I have avaliable. How to choose? How can I know which are the IPs? Can I use them like proxies with proxycap or proxifier?
Mirage
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Number of subnets in this network

Is it correct to say that there are 2 subnets in the network in the image below?
user171131
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The effect of network masks on default routes in a routing table

Possible Duplicate: How does Subnetting Work? If you setup a default route in a IP routing table you provide a network mask. What difference does it make if the mask is 0.0.0.0 compared to say 255.255.255.0? i.e what how does a net mask of…
user1568623
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How many subnets can I create (max) inside of the network 192.168.123.X/26? And why?

We discuss that topic but we have too different interpretations. That is why I'd like to know how to resolve this issue. What is the truth? Can I define max 64 subnets or max 4? Writing down an opinion will not suffice, sorry. We already have 2. We…
erikbstack
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Subnetting Doubt

I have two PCs connected to a single switch. Default gateway is not configured for both. PC1 IP Address - 10.3.0.1 Subnet Mask - 255.255.248.0 PC2 IP Address - 10.3.4.1 Subnet Mask - 255.255.252.0 Will they communicate (PING) with each other? As…
Abhilash
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Subneting starting with the biggest subnets

Can anyone explain or give me some example for the reason why we start subneting using the largest subnets first? What are consequences of opposite approach?
user308333
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Is there an effect in the subnet size (available IP addresses) when the number of nodes are fixed?

Assume I have 30 computers connected to a network. Is there any disadvantages in using /24 sub net mask over a /27 sub net mask? Do the extra IP addresses (the ones that are not configured on any node) cause a negative effect on the network…
Parakrama Dharmapala
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Any security benefits on separating AWS subnet?

In case of we have proper security groups and private/public subnets, is there any security benefit on separating AWS private subnet? For example, I have 1 ELB(public subnet) and 2 EC2(Frontend and Backend in the same private subnet). ELB ->…
jwagun
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