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IP Address Lookup

Look up geolocation, ISP, ASN, reverse DNS, and IP format details for any public IPv4 or IPv6 address.

IP address or hostname

Public addresses only. Hostnames are resolved to their first public IP. Lookups run from the server with SSRF protections.

Geolocation data is provided by a third-party API. Private, reserved, and internal addresses are blocked.

More Developer Tools

Reverse DNS LookupLook up PTR reverse DNS records for a public IP address. Resolve hostnames and verify forward DNS (FCrDNS) alignment.
Subnet CalculatorCalculate IPv4 subnet details from CIDR notation or a subnet mask. Get network, broadcast, and host ranges instantly.
CIDR CalculatorAnalyze CIDR blocks, convert prefix lengths to subnet masks, split networks, and check whether an IP belongs to a range.
DNS LookupQuery public DNS records for any domain — A, AAAA, MX, TXT, NS, CNAME, SOA, SRV, CAA, and PTR.
Port ScannerScan common TCP ports on a public host — check which services are reachable from the server.
SSL CheckerInspect TLS certificates for any public hostname — expiry, issuer, chain, cipher, and hostname match.

Part of:Free DNS & Network Tools