You can search for a single IPv4 or IPv6 address, or use CIDR notation to find a block of IPs.
Any IP or block affected by a ban or whitelisting that touches on the IP/Network you search for will be displayed.

Examples:

• 1.2.3.4
• 2001:ab3f:0ae2::
• 1.2.0.0/16
• 2a01:4f8:192:528c::2/64