What Is My ISP? |
Home or mobile provider. This network is not on our list of hosting and VPN providers. A VPN that uses home IP addresses cannot be ruled out.
216.73.216.134
AS7029
Full details for your IP → Look up AS7029 in ASN WHOIS → Test your connection speed →
An Internet Service Provider (ISP) is the company that allocates your public IP address and routes your traffic to and from the global internet. Every device connected to the internet reaches the global network through an ISP. What Is My ISP detects your ISP by mapping your public IP to its registered Autonomous System (AS) record in the MaxMind GeoLite2-ASN database, returning the network operator name and Autonomous System Number (ASN) — the BGP identifier for your ISP's routing infrastructure (RFC 4271).
| Field | Meaning | Example |
|---|---|---|
| Internet Service Provider (ISP) | The registered organization that owns your public IP block and routes your internet traffic. | Comcast Cable Communications, LLC |
| Autonomous System Number (ASN) | The globally unique BGP identifier (RFC 4271) assigned to your ISP's network routing infrastructure. | AS7922 |
The ISP name reflects the legal registered entity, which may differ from the consumer brand. "Comcast Cable Communications, LLC" is the Xfinity ISP; "T-Mobile USA, Inc." is T-Mobile residential broadband.
What Is My ISP automatically detects your Internet Service Provider and ASN when the page loads — no input or form submission required.
ISP detection resolves your public IP address — sourced from the Cloudflare
CF-Connecting-IP header at the CDN edge — against the MaxMind
GeoLite2-ASN database. The GeoLite2-ASN database maps IP address ranges to
Autonomous System Numbers (ASNs) and the organization registered to each AS.
An Autonomous System (AS) is a collection of IP prefixes operated by a single administrative domain — typically an ISP, university, or large enterprise — identified by a 16-bit or 32-bit Autonomous System Number (ASN). BGP (Border Gateway Protocol, RFC 4271) is the inter-domain routing protocol that propagates AS reachability information between networks on the global internet. Every publicly routable IP address belongs to exactly one AS.
ISP name accuracy at the Autonomous System level is typically above 98%. The ASN record maps directly to the registered network operator with high reliability. Accuracy may be lower when connections route through carrier-grade NAT (CGN), where millions of customers share a single public IP block owned by a transit provider rather than the end-user ISP.
| Attribute | ISP | ASN |
|---|---|---|
| Definition | Commercial entity providing internet access | Technical BGP routing identifier (RFC 4271) |
| Format | Company name (e.g., "Comcast Cable Communications, LLC") | 16- or 32-bit number (e.g., AS7922) |
| Assigned by | Registered as a legal business entity | IANA → Regional Internet Registries (RIRs) |
| Relationship | One ISP may operate multiple ASNs | One ASN may cover millions of IP addresses |
| Example | Cloudflare, Inc. | AS13335 (Cloudflare), AS13336 (Cloudflare EU) |
Verifying a VPN is active. A remote worker enables a corporate VPN and wants to confirm all traffic is routing through the expected provider before accessing internal systems. Loading What Is My ISP shows the VPN provider's organization name and ASN — confirming the VPN is intercepting the connection. If the real home ISP appears instead, the VPN is not routing correctly.
Troubleshooting internet performance. A home user receives speeds lower than their plan advertises and needs to confirm which ISP their connection is actually routed through before contacting support. The tool returns the ISP name and ASN in under a second, giving the user the correct provider name and a verifiable AS number to reference during the support call.
Email server setup and PTR delegation. A network engineer provisioning a new mail server needs to confirm the public IP block's registered owner before submitting a PTR record delegation request. What Is My ISP returns the ASN and organization name instantly, identifying which ISP or hosting provider controls the IP block and therefore which entity must action the PTR request.