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What Is My ISP?

What is my internet provider? This page shows it the moment it opens: its name and logo, how many people use it in your country, your IPv4 and IPv6 addresses, and whether a VPN or relay hides it. Nothing to type.

Provider sizes: APNIC Labs, Oct 15, 2026 · 235 countries
Finding your provider…

How your connection reaches the internet
Your device
Your provider…
Internet…
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Who is my ISP, and what does an ISP check show?

Your internet service provider (ISP) is the company your connection runs through: the cable, fibre, DSL, mobile or satellite network that gave your router or phone its public IP address. This page reads that address as your request arrives and answers "who is my ISP?" and "what is my internet service provider?" before you type anything.

Most ISP checkers stop at a registry name such as "Comcast Cable Communications". This one shows the brand you pay (Xfinity), how many people use it in your country, both your IPv4 and IPv6 addresses with the network behind each, and what a VPN, iCloud Private Relay or a mobile network changes.

What Is My ISP result: the internet provider's name and logo, its rank in the country, IPv4 and IPv6 and a location mapWhat Is My ISP result: the internet provider's name and logo, its rank in the country, IPv4 and IPv6 and a location mapYour ISP's nameThe brand people know, its logo and the kind of network: home broadband, mobile, satellite, VPN or data center.Its sizeIts rank and estimated users in your country, from APNIC Labs' ad-based measurements.Both addressesYour IPv4 and IPv6, each with its own network. Different networks mean a VPN that covers only one, or a second line.Where it isThe approximate place of the address: your provider's hub, usually in or near your city.
A check from a home connection: the provider people know, the network it runs on, both address families and where the address is placed. Select a number to see what each part shows.

Who are the biggest internet providers in your country?

The largest networks by estimated users, from APNIC Labs, which samples users through some 25 million online ad impressions a day, maps each one to its country and network, and scales the shares to each country's internet population. Mobile and home networks are counted separately where an operator runs them apart.

Internet users

261.4M

United States

Largest home ISP

Xfinity

17.8% of users · AS7922

Largest mobile ISP

T-Mobile

7.5% of users · AS21928

Top ten together

64.3%

of the country's users

United States: 261.4M internet usersAPNIC Labs · Oct 15, 2026

#ProviderTypeUsersShare
1XfinityAS7922 · Comcast Cable CommunicationsHome44.5M17.8%
2AT&TAS7018 · AT&T EnterprisesHome30.1M12%
3T-MobileAS21928 · T-Mobile USAMobile18.7M7.5%
4VerizonAS6167 · Verizon BusinessMobile17.8M7.1%
5SpectrumAS20115 · Charter CommunicationsHome12.8M5.1%
6VerizonAS701 · Verizon BusinessHome11.6M4.6%
7SpectrumAS22773 · Cox CommunicationsHome8.1M3.2%
8SpectrumAS10796 · Charter CommunicationsHome7.7M3.1%
9FrontierAS5650 · Frontier Communications of AmericaHome4.9M2%
10SpectrumAS20001 · Charter CommunicationsHome4.8M1.9%

Estimates: APNIC Labs AS population, Oct 15, 2026, re-used with attribution.

Why does my ISP or location look wrong?

Because the internet only sees the network your traffic leaves through, and that is not always the company on your bill or the town you are in. The tool above names the cause when it can.

Brand, network, AS number: three names for one connection

Support lines and network tools use different names for the same provider. The AS number is the one that is globally unique.

Brand

Xfinity

The name on your bill, app and router.

Network (organization)

Comcast Cable Communications

The company that registered the network, as registries and WHOIS show it.

AS number (ASN)

AS7922

The number the network announces its addresses under on the internet. Quote it to support.

Is it my ISP or my router?

Test from the inside out: your device, then your router, then the internet. The first step that fails is where the problem is.

  1. 1

    Another device

    If a phone on the same Wi-Fi works, the problem is the first device: restart it or forget and rejoin the network.

  2. 2

    Your router

    Open your router's admin page (Router Login finds it). If it doesn't load, restart the router; the problem is inside your home.

  3. 3

    Beyond the router

    If the router answers but nothing loads, Ping 1.1.1.1. Replies with no websites point to DNS; no replies point to your provider's line.

  4. 4

    Your provider

    Check your provider's status page or app for an outage, then call support with your AS number and the time it started.

How do you find internet providers by address?

With your country's official coverage map, not with an IP check: this page sees only the connection you are on. Regulators and national networks publish what each address can get, and some maps name the providers.

Elsewhere, the providers' own address checkers are the most reliable source.

What can your ISP see?

Your provider carries every packet, so it sees where your traffic goes and when, but not what is inside an encrypted connection.

It can see

  • Which servers and websites you connect to (their IP addresses and, usually, the site name)
  • When you are online and how much data you use
  • Your DNS lookups, unless they are encrypted (DNS over HTTPS or TLS)
  • Everything on the few sites still without HTTPS

It can't see

  • The pages, searches and videos inside an HTTPS site
  • Your passwords, messages and form data on HTTPS
  • Anything inside a VPN tunnel (the VPN company sees it instead)

Check what leaks with the DNS Leak Test and the WebRTC Leak Test.

How do you find your ISP without this page?

On a phone, the carrier's name is in the status bar or under Settings. At home, the router's label, your bill or your provider's app names it. From a terminal, ask our API:

irm https://dnsrobot.net/api/my-isp

PowerShell prints your provider, AS number and location as a list.

Is there an ISP lookup API?

Yes: free, without a key, open to browsers (CORS). Ask for the caller's own provider, or for any IP address.

Fair use: 60 lookups a minute per address. Answers carry network with the brand, kind, users, share and rank where we know them.

Your provider
$ curl https://dnsrobot.net/api/my-isp
{
  "ip": "203.0.113.10",
  "isp": "Comcast Cable Communications, LLC",
  "asn": "AS7922",
  "city": "Chicago", "country": "US",
  "network": { "brand": "Xfinity", "kind": "isp", "rank": 1, "share": 17.78, … },
  …
}
Any IP
$ curl "https://dnsrobot.net/api/ip-info?ip=8.8.8.8"
$ curl -X POST https://dnsrobot.net/api/ip-info \
    -H "Content-Type: application/json" -d '{"ip": "8.8.8.8"}'
$ curl "https://dnsrobot.net/api/asn?ip=2001:4860:4860::8888"

ISP questions

What is my ISP?

Your ISP, or internet service provider, is the company your internet connection runs through: the cable, fibre, DSL, mobile or satellite network that assigned your public IP address. This page names it as soon as it opens, with its brand, logo, AS number and rank in your country.

What ISP do I have, and how do I find out?

Open this page: it reads your connection and answers "what internet provider do I have?" at once. Without it, check your bill, your provider's app, the label on your router, or on a phone the carrier name (your mobile service provider) in the status bar. The AS number shown here is what support teams use.

Who is my service provider on Wi-Fi and on mobile data?

At home it is your ISP: the Wi-Fi is just your router, and your ISP connects that router to the internet. On someone else's Wi-Fi (a café, hotel or office) it is their ISP, and on mobile data it is your carrier. This page always names the one you are using right now.

Why does it show the wrong provider?

A VPN, proxy, iCloud Private Relay or Cloudflare WARP sends your traffic through another network, so that network is shown. Brands that rent another company's lines (MVNOs, resellers) show the network owner. The diagnosis under the result names the cause it finds.

Why is my location wrong?

An IP address is placed from registration, routing and provider data, not GPS. The country is nearly always right, but the city is often your provider's nearest hub, and mobile carriers route through gateways that can be in another region.

What is my ASN (ISP number)?

It is the AS number shown above, beside your provider. An Autonomous System Number identifies one network on the internet: every provider announces its addresses under one or more (AS7922 is Comcast, AS3320 Deutsche Telekom). Unlike a brand name, it is unique, so support and network tools use it.

Can my ISP see my browsing history?

It sees which sites you connect to and when, and your DNS lookups unless they are encrypted. HTTPS hides the pages, searches and form data inside each site. A VPN hides even the sites from your ISP, but the VPN company then sees them.

How do I check that my VPN hides my ISP?

Open this page with the VPN on: the provider should be the VPN's data center, marked as VPN or data center. Check both IPv4 and IPv6: if one still shows your real provider, the VPN leaks that address family, and the path above shows that lane going around the VPN.

What is CGNAT and how do I know if I'm behind it?

Carrier-grade NAT shares one public address between many customers. Compare your router's WAN address with the IPv4 shown here: if the router shows 100.64.x.x to 100.127.x.x, or any address different from this page's, you are behind CGNAT or another NAT.

Why do my IPv4 and IPv6 show different providers?

Usually a VPN or tunnel that covers only one family, so the other goes out through your ISP. Some homes also have two lines, or an IPv6 tunnel from another network. If you use a VPN, it should cover both.

Who is my internet provider by address?

An IP check can't tell you which providers serve a street address. Use your country's official coverage map instead: the FCC National Broadband Map in the US, Ofcom's checker in the UK, the Breitbandatlas in Germany, Arcep's map in France. This page only sees the connection you are on.

Is this ISP checker free, and do you store my IP?

It is free, with no sign-up. Our server reads your address only to answer the request and keeps no log of it; the lookup runs on Cloudflare's network. To show your second address, your browser also asks ipify, and Team Cymru's IP-to-ASN service names its network. The API has the same answers for scripts.

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