Linked Questions

29
votes
8answers
28k views

What is the network address (x.x.x.0) used for? [duplicate]

It appears to be common practice to not use the first address in a subnet, that is the IP 192.168.0.0/24, or a more exotic example would be 172.20.20.64/29. The ipcalc tool I frequently use follows ...
58
votes
4answers
47k views

What is the “slash” after the IP? [duplicate]

In Amazon EC2, where I set "security groups", It says: Source: 0.0.0.0/0 And then it gives an example of: 192.168.2.0/24 What is "/24"? I know what port and IP is.
15
votes
4answers
9k views

What does my ISP mean when they say they will provide “4 static IPs out of which 2 are usable”? [duplicate]

I am planning to get leased line installed at my office. I have talked to one of the ISPs about static IP. They said I'll get 4 static IPs out of which 2 are usable. What does that mean?
13
votes
5answers
162k views

How to work out how many IP's you've got available on a /29 network mask [duplicate]

This might sound like a stupid question but I would really like to know how I would work out how many IP's I've got available on this network range: 196.44.198.32/29 Can someone explain it to me, ...
16
votes
2answers
15k views

IIS7 ban IP range [duplicate]

Possible Duplicate: How does IPv4 Subnetting Work? I have a list of IP ranges I would like to ban, an example being: 119.30.47.xx Where xx is anything. I've added the domain and IP ...
1
vote
8answers
37k views

How can I add more than 255 machines to a single Class C network? [duplicate]

Possible Duplicate: How does Subnetting Work? I'm mainly a programmer. I have no idea beyond some basic theory when it comes to Networking/Administrating. My university feels that we should ...
7
votes
4answers
22k views

Networking Question - What is a VALID Subnet Address? [duplicate]

Possible Duplicate: How does IPv4 Subnetting Work? I am currently revising Networking for the Cisco CCNA1. One of the questions that I am struggling to answer is the following: Which of the ...
4
votes
3answers
39k views

What does the IP “192.168.1.1/24” indicate? [duplicate]

Possible Duplicate: Server Fault Wiki: How does Subnetting Work? I'm setting up rsync and I see this in the config file: hosts allow = 127.0.0.1 192.168.1.1/24 Does this indicate that all hosts ...
4
votes
3answers
17k views

Are same IP address with different submask unique? [duplicate]

Possible Duplicate: How does Subnetting Work? In a same block of IPv4 addresses, can there be same IPs with different submasks? For example, can I have this: 180.70.65.140/26 180.70.65.140/25 ...
0
votes
3answers
26k views

subneting .. is 192.168.0.1/24 different than 192.168.0.1/25? [duplicate]

I am trying to understand subnetting. I understand that you can take the 192.168.0.0/24 domain and break it into 2 subnets: 192.168.0.0/25 and 192.168.0.128/25. What if I need to create 2 more subnets ...
2
votes
3answers
3k views

two machines with the same public ip address but different subnet masks [duplicate]

Possible Duplicate: How does Subnetting Work? I have started my CCNA course. I wanted to get clarified on this question. can two machines have the same public address with the subnet masks(i.e ...
1
vote
3answers
7k views

How many subnets can I create (max) inside of the network 192.168.123.X/26? And why? [duplicate]

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 ...
5
votes
1answer
5k views

Amazon EC2 Security Groups - IP ranges [duplicate]

Possible Duplicate: How does Subnetting Work? So if I add 62.234.231.65/32 to my allowed IPs in security groups, does that mean that everyone with an IP from 62.234.231.0 to 62.234.231.255 can ...
1
vote
2answers
44k views

First and last IP address of the network 192.168.176.0/23 (subnet 23) [duplicate]

Let's have the following address of the network: 192.168.176.0/23. What are the first and last IP addresses of this network? Following this answer https://serverfault.com/a/327782/288201 I assume ...
0
votes
2answers
4k views

How to isolate networks when subnetting? [duplicate]

I'm currently learning about IPv4 and subnetting. As far as I understand, if we want to create 4 small isolated networks with the size 50, we can use subnetting. If we subnet a Class-C IPv4 network(...

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