Who Is My ISP? Check Your Provider, IP & ASN
See which company provides your internet, your public IP address, your approximate location and your network operator’s ASN — measured from your connection in real time. You can also look up any other IP address.
Quick answer
Your ISP is identified by who owns the public IP address your traffic leaves from — that is what this tool looks up. The public IP is assigned by your provider, and the address is registered to them or to the network operator they buy transit from, which is why the name you see is sometimes a parent company rather than the brand on your bill. If a VPN is on, it will show the VPN provider instead of your home ISP.
What “who is my ISP” actually means
Every device that reaches the internet leaves through a public IP address assigned by your provider. Public IP registries (called RIRs — ARIN in North America, RIPE in Europe, APNIC in Asia-Pacific) record which network operator owns each block of addresses. A lookup takes the address your traffic is arriving from, finds the owning block, and returns the registered organisation — that is the “ISP” you see above.
Why the name can look wrong
Several common reasons:
- Parent companies and mergers. The registry holds the registered owner of the address block, which is often a holding company or a former brand name rather than the trade name you pay.
- Transit and wholesale carriers. Smaller providers rent capacity from a larger network, so the address can be registered to that carrier. A reverse DNS hostname usually reveals the real access provider — that is why this tool shows the hostname where one exists.
- VPN, proxy or mobile carrier NAT. With a VPN on, the visible address belongs to the VPN provider. On mobile networks and some carrier-grade NAT setups, thousands of customers share one public address.
- Corporate networks. If you are on an office or campus connection, the address belongs to the organisation, not a consumer ISP.
- Business-grade static IPs are often registered to the business itself.
What the lookup cannot tell you
It reports the registered owner and an approximate city — not your street address, and not your exact device. Location is derived from the registry and the provider’s routing, so it is frequently the provider’s regional hub rather than where you actually are. It also cannot tell you whether your address is static or dynamic, or what speed you are paying for.
What is an ASN, and why does it appear here?
An Autonomous System Number identifies a network that manages its own routing on the internet. Your ISP has one (or several), it appears in BGP routing tables, and it is the most reliable way to name the operator actually carrying your traffic. Two different brands can share one ASN, and one company can hold many.
IPv4 versus IPv6 — why the two can differ
If your provider runs dual-stack, you have both. Many networks route the two families differently, so a lookup over IPv6 can report a different operator or city than the same lookup over IPv4. The type field above tells you which address family your connection used for this page.
Is this tool private?
Yes, as far as this page is concerned. It runs in your browser and queries a public IP-information service directly. This site does not log or store your address, and no account or sign-in is involved. Your provider and any network in between can of course see the traffic, as with any website.
Seeing a VPN or hosting company instead of your home ISP? That is expected if a VPN, proxy or privacy extension is active. Turn it off and press Check again to see your real provider.
Cite this tool
Who Is My ISP? (IP, provider, ASN and location lookup) — Afroz Ahmad. Available at afrozahmad.com/who-is-my-isp-tool/.
Suggested attribution: “Source: Afroz Ahmad, Who Is My ISP? (IP, provider, ASN and location lookup) (https://afrozahmad.com/who-is-my-isp-tool/).”
Free to use and free to cite. No sign-up required.
Related reading on this site
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- Subnet calculator – work out your network range and mask
- Learn networking basics – IP addressing, DNS and how the internet fits together
Reviewed and fact-checked on 24 September 2026.
How do I find out who my internet provider is?
Look at which network owns the public IP address your traffic leaves from. Address blocks are registered with a regional internet registry (ARIN in North America, RIPE in Europe, APNIC in Asia-Pacific), and the registration names the owning operator. The tool above reads your public IP and returns that registered organisation, plus the ASN, which is the most reliable way to name the operator actually carrying your traffic.
Why does the ISP name look different from the provider on my bill?
Usually one of four reasons. The registry holds the registered owner of the address block, which is often a holding company or a former brand rather than the trade name you pay. Smaller providers often rent capacity from a larger carrier, so the address can be registered to that carrier. On mobile networks and carrier-grade NAT, thousands of customers share one address. And on a corporate or campus network the address belongs to the organisation, not to a consumer ISP. The reverse DNS hostname shown above often reveals the real access provider.
Why is the location shown not where I actually am?
Because IP geolocation is not GPS. It is inferred from the registry entry and from how the provider routes traffic, so it typically resolves to a regional hub, a data centre or the provider’s nearest aggregation point rather than your street. It can be off by tens of kilometres, and it is wrong more often on mobile connections and VPNs. It is still useful for checking which country and region your traffic appears to come from.
Does this tool store my IP address?
No. The lookup runs in your browser and queries a public IP-information service directly. This page keeps no record of your address, there is no account and nothing is saved between visits. Any website you visit necessarily sees the same public IP, but this tool does not log or retain it.
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All eight run in your browser. Nothing you type is stored or sent anywhere.
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