ipset(8): administration tool for IP sets - Linux man page
linux.die.net › man › 8ipset is used to set up, maintain and inspect so called IP sets in the Linux kernel. Depending on the type of the set, an IP set may store IP (v4/v6) addresses, (TCP/UDP) port numbers, IP and MAC address pairs, IP address and port number pairs, etc. See the set type definitions below. Iptables matches and targets referring to sets create ...
IP sets - Netfilter
https://ipset.netfilter.orgIP sets are a framework inside the Linux kernel, which can be administered by the ipset utility. Depending on the type, an IP set may store IP addresses, networks, (TCP/UDP) port numbers, MAC addresses, interface names or combinations of them in a way, which ensures lightning speed when matching an entry against a set. If you want to