Free tool · instant

What is my ISP?

The internet provider and network (ASN) your connection is coming from, detected from your public IP address.

Your internet provider

Anthropic, PBC

AS16509 · IP 216.73.216.48

IP address: 216.73.216.48
IP version: IPv4
Internet provider: Anthropic, PBC
ASN: AS16509
City: Columbus
Region: Ohio
Country: United States
Postal code: 43215
Time zone: America/New_York
Protocol: HTTP/2 · TLSv1.3
Browser: Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)

We store your IP address and your location rounded to about 1 km for 12 months to improve ipbase's accuracy. Details in our privacy policy.

What websites see

Every website you visit sees this IP address and can estimate your city, provider and connection type from it.

IPv4 or IPv6?

If you see an address with colons, you are connected over IPv6. Most networks now support both.

Building this into an app? Use the IP lookup API and its IP info endpoint documentation.

ISP, ASN and IP address

ISP: the company that connects you to the internet.
ASN: the number of the network that announces your IP address to the rest of the internet.
IP address: your connection’s address within that network.

Websites use this information to detect fraud, show local content and recognize company networks. The ipbase API returns the ISP and ASN of any IP address.

Frequently asked questions

How do I find out who my internet provider is?

This page shows it instantly: every public IP address belongs to a network (an autonomous system) operated by a provider. We look up the network of your current IP address.

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

Smaller providers often rent network capacity from larger carriers, and VPNs, mobile hotspots and company networks route your traffic through their own provider. The tool shows the network your traffic actually comes from.

What is an ASN?

An autonomous system number identifies a network on the internet, for example AS7922 for Comcast or AS3320 for Deutsche Telekom. Look up any network with the ASN lookup.

IP geolocation API

Get this data in your app

ipbase returns location, ISP, ASN and time zone for any IPv4 or IPv6 address, up to 1,000 addresses per POST request. Security flags (VPN, proxy, Tor, data center) are on the Small plan and above.

Read the documentation

150 free requests every month. No credit card required.

GET https://api.ipbase.com/v2/info?ip=1.1.1.1

{
  "data": {
    "ip": "1.1.1.1",
    "type": "v4",
    "connection": {
      "asn": 13335,
      "organization": "APNIC and Cloudflare DNS Resolver project",
      "isp": "Cloudflare, Inc",
      "range": "1.1.1.0/24"
    },
    "location": {
      "country": { "alpha2": "AU", "name": "Australia" },
      "zip": "4000"
    },
    "security": { "is_vpn": null, "is_tor": null, "threat_score": null }
  }
}

Free IP tools

ASN lookup Owner and prefixes of any AS number. Bulk IP lookup Up to 100 IPs at once, CSV export. IP address converter Decimal, hex, binary, IPv4↔IPv6. IP address lookup Location and owner of any IP. IP range to CIDR converter Ranges to CIDR blocks and back. Reverse IP lookup Domains hosted on any IPv4 address. Subnet calculator CIDR, netmask and host range. VPN and proxy checker VPN, proxy and Tor flags of any IP. What is my IP address? Your public IP, location and provider. Cloud & bot IP rangesOfficial lists of AWS, Googlebot, GPTBot and more.

Example lookups: 8.8.8.8 · 8.8.8.0/24 · AS15169 · example.com · all IPv4 ranges