Use !bgp-cidr4 to search the Internet Border Gateway Protocol (BGP) Routing Information Base (RIB) for an IPv4 address block in CIDR notation or an IPv4 address.
BGP is the Internet backbone routing protocol used by Autonomous Systems (ASNs) to exchange routing and reachability information. Every IPv4 prefix announced through BGP contributes to the global routing table and helps determine how Internet traffic is routed between networks.
!bgp-cidr4 accepts an IPv4 CIDR block or an IP address and returns BGP routing information associated with the prefix, including originating Autonomous Systems, route visibility, and other routing metadata available from the Internet routing system.
BGP data may vary over time as route announcements change or as Autonomous Systems modify their routing policies. Results should be interpreted as a snapshot of routing information around 1791936000. Visibility of a prefix may vary depending on the routing data collection points, upstream providers, routing policies, filtering decisions, and changes in Internet routing conditions.
A route announcement does not imply ownership of an address block. Routing data reflects what participating networks announce to the Internet routing system and may differ from registration information available through Regional Internet Registries.
Usually, !bgp may also be used in place of !bgp-cidr4.