Who Is My ISP? See Your Internet Provider & ASN

Who is my ISP? This page answers as it loads: it looks up the address your browser used to open it and shows the internet service provider that address belongs to. You also see the provider’s network number (ASN), the network’s registered name, the registry its addresses come from, your public IP, its hostname and an approximate location. There is nothing to type and nothing to install, and you can press Check again after changing networks.

What the Result Means

The big name is the provider of the network your connection comes from, from the MaxMind GeoLite2 and DB-IP databases. Below it, the type of network says what kind of network that is:

Internet provider (home, office or mobile): an ordinary access network. The name shown is your ISP. The tool does not tell home, office and mobile connections apart.
VPN, proxy or Tor exit node: your traffic leaves through that service, so the name is the service’s network, not your own provider. Turn the VPN off and reload the page to see your ISP.
Privacy relay (such as iCloud Private Relay): sites see the relay partner’s network instead of yours. Pause the relay and reload.
Hosting or cloud network: the address belongs to a datacenter, which usually means a VPN, a proxy, a remote desktop or a server, not a home connection.

To check whether an address is a VPN, a proxy or Tor, and which list says so, use the VPN and proxy detector. A VPN can still leak your real address through the browser; the WebRTC leak test shows whether it does.

Why the Name May Differ From Your Bill

The databases name the company that holds the addresses, which is not always the brand you pay. In the US, Xfinity’s addresses are registered to Comcast Cable Communications (AS7922), and Spectrum’s to Charter Communications (AS20115). A mobile brand that runs on another carrier’s network often shows the carrier’s name, and a small local provider may show the larger network it buys its connection from. A VPN or relay shows its own network, as above.

What Is an ISP?

An internet service provider (ISP) is the company that connects you to the internet: a cable, fibre or DSL company at home, a mobile carrier on your phone, or the network your office or school runs. It gives your connection a public IP address from its own blocks, and every site you visit sees that address and can look up whose it is, just as this page does.

What Is an ASN?

An autonomous system number (RFC 1930 defines the autonomous system) identifies one network on the internet, such as an ISP, a cloud provider or a large company. Each ISP announces its address blocks under its ASN.

The numbers and the address blocks are handed out by the five regional internet registries (ARIN, RIPE NCC, APNIC, LACNIC and AFRINIC), and the result names the registry your address block is registered with, and its country. The ASN in the result links to that network’s page with its address ranges, and the ASN lookup looks up any network by its number.

How to Find Your ISP Without a Website

Your bill or account: the company that bills you for the connection is your ISP, even when its addresses carry a parent company’s name.
Your router: the router or modem is often supplied and branded by the ISP, and its admin page (usually at 192.168.0.1 or 192.168.1.1) shows the connection and the WAN address the ISP gave it.
On a phone: on mobile data, the carrier name in the status bar (Control Center on newer iPhones) or under the mobile network settings is your ISP. On Wi-Fi, your ISP is whoever provides that Wi-Fi network’s connection, not your carrier.

Neither Windows nor macOS has a single built-in command that names your ISP, because your computer only knows its address on your home network. Once you know your public address (shown on this page), macOS, and Linux systems with the whois package, can look it up with whois followed by the address, which prints the registry record of the network that holds it.

Shared Addresses and CGNAT

Many mobile and some home providers put many customers behind one public address, using carrier-grade NAT (CGNAT). The ISP shown is still right, but the address is not yours alone. This page does not detect CGNAT.

You can check it yourself: open your router’s admin page and compare its WAN address with the public IP shown here. If they match, your router has the public address itself. If they differ, something upstream translates your address.

A WAN address in 100.64.0.0/10 (100.64 to 100.127), the shared range RFC 6598 sets aside for carrier-grade NAT, means CGNAT. A private WAN address (10.x, 172.16 to 172.31, or 192.168.x) means either CGNAT or a second router between yours and the provider. Our guide to CGNAT explains what it changes.

Frequently Asked Questions

What is my ISP?

The provider named at the top of this page, as long as the type of network says Internet provider. If it says VPN, proxy, relay or hosting, the name is that service’s network: turn the VPN or relay off and press Check again.

How do I find out who my internet provider is?

Open this page: it names the provider of the connection you are using now. Without a website, look at your bill or account, the router or modem (often branded by the ISP) and its admin page, or, on a phone using mobile data, the carrier name in the status bar. On Wi-Fi, the provider is the one behind that network, not your mobile carrier.

Why does it show a different company than the one I pay?

The addresses are registered to the company that holds them, which is not always the brand on your bill. It can be a parent company (Comcast for Xfinity, Charter for Spectrum), the carrier behind a mobile brand, or the larger network a small provider buys from. If you are on a VPN or relay, it is that service’s network instead.

Is my Wi-Fi the same as my ISP?

No. Wi-Fi is the wireless network inside your home or office, run by your router. The ISP is the company whose line, cable or fibre connects that router to the internet. Several devices on one Wi-Fi network all reach the internet through the same ISP and usually share one public address, which is the one this page shows.

Does a VPN hide my ISP?

From the sites you visit, yes: they see the VPN’s network, which is why this page then shows the VPN provider’s name with a note. Your ISP still carries the connection, but it sees only encrypted traffic to the VPN server. Turn the VPN off and press Check again to see your own provider.

Is the location shown my address?

No. It is where the provider’s network is registered or routed, often a nearby city or the city where the provider’s equipment sits, never a street address. Mobile connections can show a city far from you. The IP lookup shows the full details for any address.

Can I find the ISP of another IP address?

Yes. Enter it in the IP lookup, which shows its provider, ASN, network and type, just like this page does for your own. To find who owns an address and how to reach them, for example about abuse, follow our guide to finding the owner of an IP address.

Can this page tell if I am behind CGNAT?

No, it shows only the public address and its provider. Compare your router’s WAN address, on its admin page, with the public IP shown here. If they match, you are not behind CGNAT. If the WAN address is in 100.64.0.0/10, you are behind carrier-grade NAT; if it is a private address such as 10.x or 192.168.x, it is CGNAT or a second router upstream.

Related Tools

To look closer at your network, the ASN lookup lists a provider’s address ranges, the VPN and proxy detector shows whether an address hides its user, and the WebRTC leak test checks whether your VPN leaks the address behind it.

What Is My ISP?

Provider and network

Your connection