A free MAC address vendor lookup tool — instantly find the manufacturer of any device from its MAC address (OUI lookup). Also includes a subnet/CIDR calculator, IP info lookup, and DNS lookup tool. No signup, no accounts, no rate-limited SaaS wrapper.
Resolve the OUI of a MAC address to its registered manufacturer — plus address-type decode. Any separator format works (colons, dashes, dots, or none).
Enter an address in CIDR notation to get the full breakdown.
Look up ownership, ASN, and approximate geolocation for a public IP. Leave blank to check your own.
Query public DNS over HTTPS (Cloudflare) for a hostname's records.
Real routing data from RIPE NCC's global BGP collectors. Enter an IP, a CIDR prefix, an ASN (e.g. AS15169), or an organization name (e.g. Cogent).