!bgp-cidr4 searches the Internet BGP Routing Information Base (RIB) for an IPv4 address block in CIDR notation.
Border Gateway Protocol (BGP) is the Internet backbone protocol that enables Autonomous Systems to exchange routing and reachability information. IPv4 prefixes announced by ASNs form the global routing table and describe how networks are interconnected.
This command accepts an IPv4 CIDR block and returns its BGP visibility, including originating Autonomous Systems and routing attributes.
Usually, you can also use !bgp in place of !bgp-cidr4