What Is My ISP? How to Find Your Internet Service Provider

Your ISP, or Internet Service Provider, is the company or network that provides or carries your internet connection. An IP lookup can often identify the ISP or network associated with your public IP address, although the displayed name may sometimes be a parent company, network operator, hosting provider, mobile carrier, or another organization associated with the address.

This guide explains what an ISP is, how a lookup arrives at a name, why that name can look unfamiliar, and what an ISP result does and does not tell you.

What Is an ISP?

ISP stands for Internet Service Provider. An ISP, or internet provider, connects customers or networks to the internet. Depending on the service, that connection may be delivered through technologies such as:

• Fiber
• Cable
• DSL
• Fixed wireless
• Cellular or mobile networks
• Satellite

The organization shown in an IP database is not always the company that sells service directly to you. It may be a network that your provider uses or is part of. If you are new to the basics, see how IP addresses work.

How Can a Website Tell Who My ISP Is?

When you visit a website, it normally receives the public-facing IP address used for that connection. IP and network databases can associate ranges of addresses with network operators, ISPs, organizations, and Autonomous Systems (ASNs). A lookup service uses those records to display an ISP or network name.

The name does not come from your computer's files, your browser history, your account, or your Wi-Fi password. It comes primarily from information associated with the public-facing IP address and the network behind it. The address your devices use inside your home is different, as explained in the article on public and private IP addresses.

How to Check Your ISP

The WhatIsMyIP homepage can show network information associated with your public-facing IP address. Depending on the data available, it can display:

• ISP
• Organization or network
• ASN
• Public IPv4 address
• Public IPv6 address, when available
• Approximate location

Not every field is available every time, because it depends on the data the lookup services return. You can read more about the site on the About page.

Check your IP address and ISP

Why Does My ISP Name Look Wrong or Unfamiliar?

An unexpected name is common and usually has an ordinary explanation. For example:

• The database may show the legal or registered owner of the network, which can differ from the brand you pay.
• Your connection may use a parent company's network.
• An ISP may lease or resell connectivity from another provider.
• A mobile carrier may route traffic through another network entity.
• A business or corporate network may appear instead.
• A VPN or proxy may cause the exit network or provider to appear.
• Hosting or datacenter connections may show the hosting provider.
• Database information can be outdated, or classified differently by different providers.

An unfamiliar ISP name does not automatically mean your connection has been hacked or compromised.

ISP vs Network Organization: What’s the Difference?

The "ISP" and "organization" fields in IP databases do not always mean exactly the same thing. The ISP field may identify the provider or network associated with connectivity. The organization field may identify the network owner, a company, a hosting provider, a carrier, or another organization associated with the block of addresses.

Different databases may label the same network differently, and these field names are not universal standards. When two lookup tools disagree, it is often a difference in labeling rather than a mistake.

What Is an ASN?

ASN stands for Autonomous System Number. At a high level, an autonomous system is a network, or a group of IP address ranges, operated under a common routing policy. The ASN helps identify the network that announces and routes a range of addresses on the internet.

Organizations that hold ASNs include ISPs, cloud providers, hosting companies, universities, large businesses, and content or network providers. An ASN is not the same thing as an ISP, because many ASNs belong to organizations that are not consumer ISPs at all. Still, it can sometimes be more useful than a consumer-facing ISP name for identifying the actual network carrying an IP address.

Does My ISP Know My IP Address?

An ISP that provides your connectivity generally needs to assign, route, or otherwise manage the addresses used for your connection, so it can associate network activity with addresses inside its own infrastructure to some degree.

Beyond that, the details vary. What a provider records, how long it keeps records, and what rules apply depend on the provider, the technology, how it is configured, and the jurisdiction. This article does not cover those questions and is not legal advice.

Can My ISP See What Websites I Visit?

Your ISP carries your connection's traffic, but what it can observe depends on several factors, including HTTPS and other encryption, your DNS configuration, whether you use a VPN, how the network is designed, and which protocols are in use.

With HTTPS, the contents of the pages you view and the data you exchange are encrypted between your browser and the website. That does not necessarily mean your ISP has no information at all about the connection. Neither "your ISP sees everything" nor "your ISP sees nothing" is an accurate general statement.

Does a VPN Hide My ISP?

A VPN does not make your underlying internet provider disappear. Your connection still reaches the VPN through your existing network and ISP. What changes is what websites see: traffic arriving from a VPN normally carries the VPN server's public IP address, so a lookup may identify the VPN or datacenter network instead of your usual ISP.

VPN configurations vary, and a VPN does not guarantee anonymity, privacy, or security on its own. The WhatIsMyIP homepage includes an optional VPN and proxy check that you can run if you are curious, but detection of this kind relies on network signals and is not always accurate.

Why Does My ISP Change When I Use Mobile Data?

Switching from home Wi-Fi to mobile data changes the network carrying your connection. As a result:

• Your public IP address may change.
• The ISP or network name may change.
• The ASN may change.
• The approximate IP location may change.

Mobile carriers may also route traffic through infrastructure located away from where you physically are, so the displayed location can be some distance from you.

Can My ISP Change Without Me Switching Providers?

The ISP or network information shown for your connection can change even if you did not change your service provider. Possible reasons include:

• IP address reassignment
• Different network routes
• Mobile carrier infrastructure
• ISP partnerships
• Reseller arrangements
• Parent or subsidiary network names
• VPN or proxy use
• Database updates

Not all of these change who you actually pay for internet service. It helps to distinguish your actual service provider from the network or database label an IP lookup shows.

Does IPv4 or IPv6 Affect Which ISP Is Shown?

A connection may have both an IPv4 and an IPv6 address. The two may belong to the same provider, but they can also map to different database labels, use different routing infrastructure, or return slightly different network and location information. That does not always happen. To learn how the two versions differ, see IPv4 vs IPv6.

Can an IP Address Reveal the ISP but Not the Person?

An ordinary public IP lookup can often identify the network or provider associated with an address. It generally does not return a subscriber's personal name, account number, or home address.

That describes what a normal public lookup shows. It does not mean that no provider or authorized authority could ever associate subscriber records with an IP address.

ISP and IP Location

ISP and network routing can affect IP geolocation. The approximate location for an address may correspond to ISP infrastructure, a regional gateway, a network exit point, or a nearby city, rather than your precise physical location. Treat it as an approximate guide only. The article on IP location explains this in more depth. For how information may be handled on this site, see the Privacy Policy.

Frequently Asked Questions