Continue your diagnosis
Check DNS records, open ports or website responses with the related tools below.
IP & Network Tools
Free IP lookup, geolocation, ASN and subnet tools. Choose a tool for your network question.
IP Lookup
Look up an IPv4, IPv6 or domain to see its network owner, ASN, reverse DNS and approximate location.
Open toolIP Location
Find the approximate country, region and city of a public IP address, with a map and the database release date.
Open toolASN Lookup
Find the autonomous system behind an IP address or inspect an ASN, its operator and announced network prefixes.
Open toolIPv4 & IPv6 Subnet Calculator
Calculate a CIDR network, address range and subnet mask, or check whether an IP belongs to a subnet. Runs in your browser.
Open toolBulk IP Lookup
Check up to 50 public IPv4 and IPv6 addresses for approximate location and ASN, then export CSV or JSON.
Open toolCGNAT check
Compare your router WAN address with your public IP before setting up port forwarding.
Open toolMy IP
See your public IPv4 and IPv6 addresses or get your address from the command line.
Open tool