Who owns this IP?
Look up the network owner, ASN, and CIDR block any IPv4 or IPv6 address belongs to. Defaults to your own.
In one line: MyIPSpeed ASN Lookup resolves any IP address or AS number to its autonomous system, organisation, country, registry (ARIN, RIPE, APNIC, LACNIC, AFRINIC), and announced IP prefixes via RDAP in under 2 seconds.
About ASNs and BGP
An ASN (Autonomous System Number) identifies a single network operator that announces routes to the global internet via BGP. Every ISP, cloud provider, and large enterprise has at least one. There are roughly 110,000 active ASNs in 2026, spread across five Regional Internet Registries.
What this tool does
Given any IPv4 or IPv6 address (or an ASN like AS13335), we query RDAP — the modern WHOIS replacement — to find which ASN announces the IP prefix, then resolve the ASN to its organization, country, registry (ARIN, RIPE, APNIC, LACNIC, AFRINIC), and the list of announced prefixes. Results in under 2 seconds.
ASN vs. IP — what each identifies
An IP address identifies one endpoint. An ASN identifies an entire network — the collection of prefixes that one organization announces to the global routing table. One organization can hold multiple ASNs (Cloudflare alone has dozens); one ASN can announce thousands of IP prefixes.
How ASNs are assigned
A network requests an ASN from its Regional Internet Registry. RIRs allocate ASNs from blocks delegated by IANA. 16-bit ASNs (0-65535) are mostly exhausted; new allocations are 32-bit (up to ~4.2 billion). Public visibility is via WHOIS/RDAP databases at the RIRs.
Related tools and reading
Use the WHOIS lookup for domain ownership data (different protocol, similar pattern). Read our explainer on ASN and BGP for a deeper dive into internet routing. Real-time route data lives on BGP looking glasses like bgp.he.net.