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Network IP Addressing
Am I stealing someone else's IP address by resetting my router?
Resetting a router can cause it to revert to its default. If you'd been using a static IP it may revert to dyanmic configuration, but is that theft? (Continue reading...)
Does email coming from the same IP address imply that it was the same computer?
IP addresses are encoded into email headers. But if you get two emails from the same IP address you can't assume that they came from the same computer. (Continue reading...)
How do I configure my static IP address?
Once you've been assigned a static IP address you'll need to configure the network-connected device manually to use it. We'll look at how. (Continue reading...)
How do I find out who's at a particular IP address?
Internet users often want to identify who someone else might be with only an IP address to go on. It's just not something you and I can do. (Continue reading...)
How do I stop someone from using or voting from my IP address?
Many online polls and voting tools use your IP address to keep track of the number of votes you've made. Unfortunately that technique is flawed. (Continue reading...)
How do I translate a URL to an IP address?
Mapping a domain to an IP address is very easy with several tools, both on your machine and on the internet. I'll look at the two I use. (Continue reading...)
How does flushing DNS help resolve some issues, and while you're at it what's DNS?
DNS transforms domain names into IP addresses. Your PC caches or remembers much of the DNS information but sometimes, though, it needs to forget. (Continue reading...)
Is DHCP safe?
DHCP is a fundamental technology to assign IP addresses to computers connected to a network. There are scenarios where DHCP might be spoofed. (Continue reading...)
Is dial-up safer?
When you dial-up to get an internet connection you typically get a different IP address each time. Is that safer or more anonymous? Not really. (Continue reading...)
Is it normal for an IP address to change from time to time?
If you connect to the internet as most users do your machine will be assigned a dynamic IP address that can change without notice, or any real effect. (Continue reading...)
What happens if two computers have the same IP address?
Two computers should never have the same IP address if they're on the same network. If they do, results are unpredictable. (Continue reading...)
What is DHCP?
DHCP is the protocol computers use to request and receive a "dynamic" IP address. (Continue reading...)
What is a "subnet mask"?
A subnet mask is a way of telling your computer or router what network addresses it can consider local and which are remote. (Continue reading...)
Why can't I connect with a 169.254.x.x IP address?
169.254.x.x IP addresses are self-assigned when your computer can't get an address any other way. It's an almost sure sign of a problem. (Continue reading...)
Why does my home network only work with one computer at a time?
If there is a conflict with your IP address, it could result in only one of the machines on your network working at a time. (Continue reading...)
Why is my IP blocked at a website I visit regularly after I changed ISPs?
IP address blocking frequently has an unintended side-effect: you could end up paying for someone else's bad behavior. (Continue reading...)
