Who is my ISP
What is an ISP?
An ISP, or Internet Service Provider, is the company that connects you to the internet. Think of them as the gatekeeper to the online world: every website you open, email you send, and video you stream travels through your ISP's network. You might know your provider from the brand on your bill, or you might have no idea, which is why finding out who your ISP is is such a common first step.
How do ISPs work?
ISPs connect to super-fast internet lines, which they use to give their customers quick and reliable service.
Big ISPs often have their own private lines, while smaller ones might share with other companies. ISPs use servers in big data centers to manage all the information flowing through their networks, helping everything run smoothly.
When you open a website, the request travels from your device to your router, then to your ISP, and across a chain of larger networks before it reaches the server hosting the site. The answer follows the same path back. Along the way, your ISP assigns your public IP address and usually runs the DNS resolver that turns domain names into addresses.
What services do ISPs provide?
Beyond raw connectivity, most providers bundle other services: DNS resolution, email accounts, static IP addresses for businesses, and sometimes TV and phone packages. Bundling is one reason bills are hard to compare, and one reason customer satisfaction varies so much between providers.
Types of internet connections
ISPs deliver the internet over different technologies. The type of connection has a big effect on speed, stability, and price:
Fiber
Fiber sends data as light through glass cables. It offers the fastest and most stable speeds, usually with equal upload and download, and it is not affected by distance the way older technologies are. Availability keeps expanding in cities and suburbs.
Cable
Cable internet runs over the same coaxial cables as cable TV. It is fast and widely available, but you share the local capacity with your neighbors, so speeds can dip at busy times.
DSL
DSL uses ordinary telephone lines. It is slower than fiber and cable, and the further you live from the exchange, the more speed you lose. It remains common in areas without newer infrastructure.
Satellite
Satellite internet works almost anywhere, which makes it valuable in rural and remote areas. The trade-off is higher latency and, for some plans, lower data caps.
Fixed wireless and 5G
Fixed wireless providers beam the connection to an antenna on your home, and 5G home internet does the same over mobile networks. Both avoid cables entirely and can be set up quickly, though speeds vary with signal quality.
ISP tiers and examples
ISPs are generally categorized into three tiers:
- Tier 1: the backbones of the internet with global networks, like AT&T, Verizon, and Lumen. They sell access to other providers.
- Tier 2: large regional or national providers, such as Comcast and Cox. They buy access from Tier 1 and serve consumers and smaller ISPs.
- Tier 3: local providers, often small regional companies or municipal networks, that buy access from higher tiers to serve specific areas.
In the U.S. alone there are nearly 2,900 ISPs according to BroadbandNow, from global giants to small town cooperatives.
ISP vs. Wi-Fi vs. mobile carrier
These three are easy to mix up, especially because one company often provides more than one of them:
- Your ISP delivers the internet to your address. This is the company you pay for the connection itself.
- Your router shares that connection with your devices over Wi-Fi. You may rent it from your ISP or own it yourself, and replacing it does not change your ISP.
- Your mobile carrier is effectively your ISP when you use mobile data: the same job, delivered over a cellular network instead of a cable.
Switching ISPs
If you are unhappy with your provider, start by checking what is actually available at your address: availability varies street by street, and what a neighbor has may not be offered at your door. Compare the advertised speeds, the upload speed (often ignored but important for video calls), contract length, and the price after any introductory discount ends. Finally, check the early termination terms of your current contract before you commit to a switch.
What does your ISP see?
Your ISP sits between you and everything you do online, so it sees more than most people realize:
- Which sites you visit. Even with HTTPS, your provider can usually see the domain names you connect to, plus timing and data volume.
- Your DNS lookups, unless you use an encrypted resolver such as DNS-over-HTTPS.
- Content of unencrypted traffic. If a site does not use HTTPS (the padlock in your browser), sensitive information like usernames and passwords can pass through in the clear.
What HTTPS protects is the actual content: pages, messages, and passwords on secure sites stay unreadable to your ISP. If you want even the domain names hidden, using a VPN encrypts the whole connection.
How to find out who your ISP is
The fastest way is our free Who Is My ISP lookup, which shows your provider, IP address, and approximate location in seconds. You can also check your bill, or your router's admin page. We cover all the methods, and the reasons they sometimes disagree, in our guide on how to find your ISP.