Questions tagged [subnet]

Questions relating to IP subnetting, including planning, calculation and best practices.

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May every IPv6 address be written as an IPv4-mapped IPv6-address?

In RFC 5952 - section 5 it is stated that for some IPv6 addresses it is recommended to give the mixed notation, if it has a certain prefix. However, it is unclear which prefixes are used for this, ...
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Rediscover method of calculation Subnet [duplicate]

I am preparing for my CCENT exam and about 3-4 month ago, I had found a method of calculating subnet. Unfortunately I did not bookmark the site and i forgot how to do it. All I remember is how you ...
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Calculate subnet mask [duplicate]

I'm a student of electronics and get lessons in networking as well. But on one of my tests I got the question: What subnet mask is indicated by the network address 172.16.4.8/18? I know the answer ...
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How do VLAN's work with subnets? [duplicate]

I know how to subnet but I'm a bit confused when it comes to how VLAN's work within a network. Say i have 3 different groups of users, split on 2 different levels of a building. Ground floor = 5 ...
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In cisco packet tracer, RIP not working when connected to different subnets [closed]

An organization is granted a block of addresses with the beginning address 200.20.20.0. The organization needs to have 4 subblocks. a. Cyber - 100 addresses b. CSE - 50 addresses c. EEE Department - ...
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Configure DHCP for VLAN [closed]

I'm configuring DHCP for VLAN on a router. At last, the computer can not retrieve the IP address. Below is how I have configured. Switch Switch>en Switch#conf t Switch(config)#vlan 10 Switch(...
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Really new to Networking and wondering how the first 3 octets of 255 is 1 network [duplicate]

Watching this video on subnetting and I am kind of confused as to why the first 3 octets are all counted as one network but the last octet only adding 1 bit to it makes another network entierly. I'm ...
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How to calculate subnet mask if the prefix is given like /29 [duplicate]

How can you convert a prefix like /29 into a netmask?
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What is the significance of subnets in a network interface? [duplicate]

I am struggling to understand how subnets are used in interfaces (ie. virtual interfaces in Linux) I am not asking how subnets are calculated. An interface has an IP address, but it also has a netmask ...
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lan with multiple ip [duplicate]

If imagine lan assigned ip from from this range (192.168.1.0/24) then can we assign another ip from same subnet mask? If no why?
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communication between two subnets [duplicate]

Let's say I have a computer 192.168.0.1 masks 255.255.255.0 and another computer 192.168.0.2 with a mask 255.255.0.0, can I ping the second computer from the first even though it's on a different ...
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Do any subnets "Network ID" AKA "Network Address" always have an even number as the last octet? [duplicate]

Should a subnet have a "Network ID" AKA "Network Address" (eg: the first address, which is always unusable, and is the boundary between the previous subnet and the current subnet) ...
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/8 base subnetting [duplicate]

I have a question on subnetting, the below question asks for the subnetting a /8 base network. I do not understand how to have at least 64 networks available while subnetting. I have checked the ...
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How do I calculate the CIDR-prefix a.b.c.d/P of a subnet? [duplicate]

It's been a while since I've done subnetting and I am once again returning to it due to work. Given the IPv4 prefix 33.22.20.0/23 = 00100001 00010110 0001010x xxxxxxxx I want to divide the network ...
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Why it is possible to use /31 subnet mask for point-to-point connection? [duplicate]

Suppose we have point-to-point connection between routers R1 and R2. Since there are always one client when sending packet, we don't need broadcast address in this situation. We also need 2 address to ...
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subnetting to give 4 2000 adresses [duplicate]

A large number of consecutive IP addresses are available starting at 198.16.0.0/19. Suppose that four organizations, A, B, C, and D, request 2000, 2000, 2000, and 2000 addresses, respectively, and in ...
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Two networks with two different subnetmasks

This may be a dumb question but I really don't get it. Let's assume we have two networks. Network A and B. They have the following devices: Network A Device X (IP: 192.168.0.10; subnet mask: 255.255....
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How do i know which subnet mask should i use for an ip address of 135.135 [duplicate]

If i have to make two separate subnets for two different users like one for teacher and one for the students
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Need help with finding range of 120 subnets [duplicate]

i'm trying to find out the subnet address and broadcast address of subnet no 120. I know that for example if my subnet 1 address is 120.0.64.0 then i just need to keep adding 64, which is e.g 64 + 64 ...
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Could someone please clarify my understanding of this question? [duplicate]

I have been asked to use a particular IP address for a homework lab. The IP address is 218.179.169.7 and I have been asked to create 24 subnets and use the 16th network address. I dont fully ...
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Divide IPv4 network into subnets in a SPECIFIC order [duplicate]

My private addresses start at 10.10.0.0/16. I must make 2 subnets with 120 and 450 starting with the 120 one and not leaving any unnecessarily unused addresses. Let me remark, it's IMPERATIVE that the ...
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What exactly defines a LAN? [duplicate]

I'm trying to understand what exactly defines a Local Area Network as such? This is how Wikipedia defines a LAN, and that sort of how it's defined anywhere else I found: A local area network (LAN) is ...
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A question from an online subnetting quiz [duplicate]

Does anyone know the last usable host IP address for the 172.45.120.0/23 network? And an explanation of how you got the answer? It's a multiple choice question on an online subnetting quiz. I'm ...
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Dividing Network into Subnets [duplicate]

Divide the network 172.16.0.0/22 ​​into subnets of the following size: 128, 300, 40, 20, 20. How exactly is this done?
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In gnss3, why can't I ping my cisco router from my VM?

I have the following network, I have never configured a Cisco router before so I'm having a little trouble. In router R1 I used the following commands to assign an ip to the router: configure terminal ...
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What is the use of a host mask/ wildcard with respect to subnetting and ranges? [duplicate]

Taking the example of 10.0.0.0/20, that means my range is 10.0.0.0 to 10.0.15.255 I got that range because I know that the wild card is 0.0.15.255 and I just add it with the beginning address 10.0.0....
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How to find the first and last address in the FIRST AND LAST SUBNET [duplicate]

So there's a problem that literally stress me out every time I look at it. It's like I almost understand it until I get to knowing how to find the first and last host in the LAST address (last subnet)....
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IP address, network ID, host ID and subnet ID [duplicate]

I am studying a course about computer networking and again I stumbled upon a section that raised a question. I found very helpful people in this forum and I hope you can help me once again. During the ...
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Why does sub-netting not give us more addresses? [duplicate]

Sorry if this is dumb, but I am very knew to learning about networks. Here is my reasoning? Let's take the address, 24.50.12.4 if we subnet it with /16 then the network address is 24.50 + host is 0.0....
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difference between network address and subnet address [duplicate]

Now this question seems a bit childish to ask, but since i am new to networking, so i think i should ask the question here. while studying about subnetting, i was trying to understand a subnet mask, ...
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ASSIGNED or AGGREGATED-BY-LIR status of IPv6 subnet used for Virtualisation

According to the RIPE NCC IPv6 Basics training slides the ASSIGNED status should be used for your own infrastructure and individual (large) assignments to customers. The AGGREGATED-BY-LIR status ...
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Additional subnets in a class C IP [duplicate]

If i'm designing a new subnet mask for a class C IP that will have 5 subnets that means I need to borrow 3 digits since 2^3-2 > 5. My question is, how many additional subnets do we have? would it be ...
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Multi LAN network does the main router to the internet need to be in its own subnet?

I have to design a network where there are 4 within which are different number of VLANs with varying number of hosts per VLAN depending on the building. My confusion lays in the main router, does it ...
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Does 10.10.192.0/20 represent the same number of address with 10.10.195.0/20 [duplicate]

I knew 10.10.192.0/20 can represent the ip addresses from 10.10.192.0 to 10.10.207.255, but I'm confused how does 10.10.195.0/20 represent? I guess it is same with 192.0/20 right?
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CIDR notation confusion [duplicate]

So we are using CIDR for subnetting In that we just define the subnets by using / SO my question is if I am using /24 it means that I have the last octet for host. But if we use anything from /17 to /...
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Are network IP addresses ever used as source or destination IPs? [duplicate]

The first IP address of an IP subnet is the network address, which stands for the whole network, while the last address is the broadcast address. As far as I understand, we never really send packets ...
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How to calculate subnet mask including, network address, gateway, broadcast address and host range? [duplicate]

You are defining network boundaries within a /24 network of 172.30.20.0/24. Please complete the segmentation of the /24 to account for multiple smaller networks of 115, 50, 28, 12, and 5 hosts. ...
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Split to four equal size subnets [duplicate]

Question; Suppose an ISP owns the block of addresses of the form 128.119.40.64/25. Suppose it wants to create four subnets from this block, with each block having the same number of IP addresses. What ...
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About relation of ip adresses and number of hosts [duplicate]

Question is; https://imgur.com/9nKqRgE I am not sure about the answer but my thinking is that if there are 35 hosts then 2^x=>35 after that i find x is 6 it means 6 zero we have on subnet. and ...
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ARP traffic for devices in same LAN but different subnets [duplicate]

Given a LAN with 5 devices (a,b,c,d,e). Where devices a and b are in one subnet and d,e,f are in another. Will an ARP request broadcasted by a looking for device b reach devices d, e ,f as they are ...
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How to calculate bits needed for host, bits left for network, number of available networks? [duplicate]

I have a class b address of 145.14.0.0 I need to create a scheme where each subnet accommodates 2259 hosts. can someone explain step by step how to do that
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Can 2 Directly connected PCs having the same network ID but different subnet mask talk? [duplicate]

If Pc1 has IP 192.168.10.2 / 24 ---> Network ID : 192.168.10.0 and Pc2 has IP 192.168.11.3 / 23 ---> Network ID : 192.168.10.0 directly connected (no switches no routers). Why cant i ping? But if ...
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Subnetting different ip on same networks with different mask

I am a little confused with subnetting. Looking for a proper explanation. Suppose I have 3 routers A, B and C. Int 1: 10.0.0.1/30 <-- Router A Int 1: 10.0.0.2/30 <-- Router B Int 2: 10.0.0....
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Sonicwall DHCP Reserved addresses Broken After Expanding Subnet

I've just expanded our subnet at work from /24 to /22 now that we've started running out of addresses. For ease of transition, I left all statically-assigned IPs at their original addresses and moved ...
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1answer
130 views

Are there any constraints to Subnetworks? [duplicate]

Using this network mask 255.255.255.0, I can steal 2 bits from the host bits to make 4 subnets. Now I've never seen it but is it also possible to use the NWMask 255.255.0.0 and also create 4 ...
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1answer
283 views

divide a network into 2 unequivalent subnetworks [closed]

I have two /16 networks which I want to divide : 10.84.0.0/16 and 10.94.0.0/16. I divided the first one in 4 equal subnets /18. But for the second I want a quarter of it in the first subnet, and all ...
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1answer
1k views

Can two networks have the same address with different masks? [duplicate]

Is it possible for two networks to have the same network IP address if two different masks are used? Take for instance the addresses 200.23.18.0/24 and 200.23.18.0/27. I'm thinking that this might be ...
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1answer
3k views

Calculating supernet mask [duplicate]

I have a (hypothetical) network with the following subnet addresses allocated using VLSM: The network address is 150.200.48.0. According to this site: http://subnet-calculator.org/supernets.php, you ...
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2answers
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How can I share my printer on different NAT? [closed]

Hello I am facing a problem. Here I am attaching an image file where my problem diagram is drawn. Please look at the image before read this problem. There you will get a clear view about the problem. ...
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1answer
19k views

How to find number of borrowed bits in subnetting [duplicate]

I am an Electrical Engineer learning about computer Networks, So this question might be childish and easy for most of you. Please answer it briefly. I am performing subnetting where I have this ...

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