How do I determine who the ISP of an IP is?
I'm looking for a way to find the ISP of a given IP address. How do I know what ISP assigned this IP address to a user?
Edit: Thanks for the information about whois lookup queries @LPChip and @AFH! That's an excellent way to find in-depth information about an ISP. I've done some more research and it turns out there are also sites that provide an easier way to find the ISP of an IP, such as whoismyisp.org.
3 Answers
You'll need to perform a whois lookup to get information about an ip address. There are a few major organisations who keep track of IP addresses for certain areas, such as North America, South America, Europe, Asia, etc.
There are also sites that will use all these databases and let you query globally.
One of these sites is
Enter the IP Address in question in the search bar and you'll see which organisation is responsible for this IP address, including contact information for abuse etc.
If you use one of the many "whois" sites, they will tell you who owns any IP you specify.
9A simple call to the whois command-line binary with the IP address of your choice will return many information including a field named org-name that contains what you refer to as the name of the ISP.
Another solution is to use a service such as Ipregistry (disclaimer: I run the service) that returns among others, this information.
