Tools for your next network question.
Start with your connection, inspect DNS, or calculate an address range. Each tool explains its scope and gives you a useful next check.
IP and routing
My public IP
The address and approximate location visible on your web request.
Open tool →IP lookup
Network owner, ASN and approximate location for a public address.
Open tool →Compare IP
Record a starting result and check again after changing connections.
Open tool →IP Address Checker
Validate and classify an IPv4 or IPv6 address. Identify private, public, carrier-shared, loopback, link-local, multicast and documentation addresses locally.
Open tool →CGNAT Check
Compare your router's WAN address with the same IP version seen by a website. Identify carrier-shared or private ranges and investigate possible CGNAT or double NAT.
Open tool →DNS
DNS Lookup
Check a domain's DNS records, TTLs and resolver response. Look up A, AAAA, MX, TXT, NS, CNAME, SOA and CAA records with clear explanations.
Open tool →Reverse DNS Lookup
Query public IPv4 and IPv6 reverse DNS records. Find PTR hostnames, inspect TTLs and understand what a missing or unexpected hostname means.
Open tool →Hostname Lookup
Resolve a public hostname's A and AAAA records together. See IPv4 and IPv6 answers, aliases, TTLs and clear missing-record states.
Open tool →Calculators
IPv4 Subnet Calculator
Calculate IPv4 network, subnet mask, broadcast, usable range and address counts. Supports prefix lengths, dotted netmasks and /31 or /32 networks.
Open tool →CIDR Calculator
Find IPv4 or IPv6 CIDR boundaries and exact address counts. Check whether an address belongs to a network without expanding large ranges.
Open tool →IPv6 Formatter
Validate IPv6 and convert between compressed and expanded notation. Format equivalent addresses locally and inspect their special-purpose classification.
Open tool →Need instructions for your device? Browse the IP address guides.