Free IP tools.
Handy utilities for network engineers and developers. Subnet math, DNS lookups, ASN and WHOIS data - all in one place.
IP Subnet Calculator
Compute network details from any IPv4 or IPv6 CIDR - subnet mask, broadcast, usable host range, and more.
Open tool →DNS Lookup
Look up DNS records for any domain - A, AAAA, CNAME, MX, NS, and TXT records in one query.
Open tool →What Is My IP
See your public IP address with geolocation, ASN, organization, and network type details.
Open tool →ASN Lookup
Find the owner, registry, country, and registration details for any autonomous system number.
Open tool →IP to ASN
Map any IPv4 or IPv6 address to its originating ASN, announced route, and organization.
Open tool →Reverse DNS Lookup
Query PTR records to find the hostname associated with any IPv4 or IPv6 address.
Open tool →WHOIS Lookup
Registrar, dates, name servers, and ownership for any domain or IP address.
Open tool →IP Address Converter
Convert any IP address between dotted decimal, integer, binary, and hexadecimal formats.
Open tool →