Perform a reverse DNS (PTR) lookup for all IPv4 addresses inside a/24 IPv4 CIDR block. A PTR record (Pointer Record) maps an IPv4address to a hostname using the in-addr.arpa domain. This lookup reveals the domain names associated with all 256 IPv4 addresses inthe block and is commonly used for diagnostics, network mapping,verification, logging, and security analysis.
Use !ptr24 to see the names (Pointer Records) of all the IPaddresses in a /24 address block. Internet DNS Pointer Records,also known as IP-names or IP-reverses, are usually set by or incoordination with the organization that manages the IP addressesand may convey useful information.
For IPv4 address analysis use !ip4; for IPv4 CIDR block analysis use !cidr4; for IPv4 WHOIS registration data use !whois-ip4; for BGP routing visibility use !bgp-cidr4.
Usage: !ptr24 <ipv4-cidr-block>
Usually, !ptr is used for single IPv4 and IPv6 addresses, while!ptr24 is used for full /24 IPv4 blocks.