IP addresses

• cidr Network, netmask, bounds and full list of addresses of an IPv4 or IPv6 range.
• my-ip server Your public IP address, as the internet sees it.
• ping server Ping an IPv4 address from the r-no.fr server, to check it answers from another network path than yours.
• range Turn any address range into the shortest exact list of CIDR blocks.
• reverse The name behind an IP address (reverse DNS), and whether it points back to it.
• split Split a network into equal subnets, or into subnets sized for your needs (VLSM).
• whois Who holds an IP address, a range or an AS number, and where to report abuse.