IP to ISP Lookup — Find the ISP and Network Behind Any IP Address
Enter any IPv4 or IPv6 address to find the Internet Service Provider (ISP) behind it, along with the organization, network type, and ASN that routes it. Free to use — no signup required to run a lookup.
What an IP to ISP lookup tells you
An ISP (Internet Service Provider) is the organization that owns or routes a given block of IP addresses and provides internet connectivity over it — a home broadband company, a mobile carrier, a hosting provider, or an enterprise network.
An IP to ISP lookup maps a single public IP to the provider responsible for it. For any IPv4 or IPv6 address the tool returns:
| Field | What it tells you | Example (8.8.8.8) |
|---|---|---|
| ISP Details | The provider or organization that owns the address | Google LLC |
| Name | The registered network name | |
| ISP Domain | The provider's primary domain | google.com |
| ASN | The Autonomous System Number routing the address | AS15169 |
| Type | The network category — business, ISP, hosting, etc. | BUSINESS |
| Registry | The Regional Internet Registry that allocated the block | ARIN |
| Registered Country | The country the network is registered in | US |
| Registered Date | When the network block was allocated | 2000-03-30 |
A lookup identifies the network owner, not the individual person behind the address. Results are also available as raw JSON via the View as JSON toggle.
To list every prefix a network controls or work from an AS number directly, start with the IP to ASN Lookup tool.
When to run an ISP lookup
- Triage suspicious traffic. When you see spam signups, scraping, or brute-force attempts, the ISP and ASN tell you which network the requests come from — a first read before you decide to allow, challenge, or block.
- Apply network-based rules. Teams allowlist or denylist by provider or network type. Identifying the ISP is the step before that decision.
- Investigate fraud and abuse. Abuse often clusters on a handful of providers or hosting networks; the ISP/ASN makes that pattern visible across many IPs.
- Diagnose connection and routing issues. If a user reports slowness, knowing their ISP helps you spot provider- or routing-related causes.
- Tell consumer traffic from business or hosting traffic. The `Type` field labels the network (e.g. `BUSINESS`), so a consumer ISP reads differently from a hosting or enterprise organization — useful when judging whether traffic looks like real users.
How IP-to-ISP lookup works
Every public IP address is allocated by one of the five Regional Internet Registries — ARIN (North America), RIPE NCC (Europe and the Middle East), APNIC (Asia-Pacific), LACNIC (Latin America), and AFRINIC (Africa) — to the organization that operates it. That organization announces the address to the internet under an ASN. An IP to ISP lookup reads this registry and routing data to return the provider and ASN behind the address.
Two limits worth knowing: a VPN or proxy changes the result to the ISP of the exit server, not the user's own connection — so a lookup on VPN traffic shows the VPN provider. And only public IP addresses resolve to an ISP; private ranges (such as 192.168.x.x or 10.x.x.x) exist only inside local networks and have no public provider.
Need to know whether an IP is itself a VPN, proxy, or hosting node? That's a detection question — use the VPN & Proxy IP Detection tool.
FAQs
Use the Check My IPbutton to look up your current public IP, then read the ISP shown. If you're connected through a VPN or proxy, the result will be that service's provider, not your home connection.
VPNs, proxies, and corporate networks route traffic through their own IPs, so the lookup returns their ISP and location. Geolocation is also approximate — it reflects where the network is registered, which may differ from the device's physical location.
IP to ISP headlines the provider name behind an address. IP to ASN lookup headlines the Autonomous System — the ASN number and the network prefixes that organization controls. Both start from an IP and share underlying data; choose IP to ISP when you want the provider, IP to ASN when you want the network detail.