sipcalc
Calculate IP subnet information for IPv4 and IPv6 addresses. tldr-pages
On several platforms
Several platforms
Display subnet information for an IPv4 CIDR address
sipcalc 192.168.1.0/24IdentifyDisplay all available information for an address
sipcalc --all 192.168.1.0/24IdentifySplit an IPv4 network into subnets of a specified mask
sipcalc --v4split 255.255.255.128 192.168.1.0/24IdentifyDisplay IPv6 reverse DNS information
sipcalc --v6rev 2001:db8::/32IdentifyEnable DNS name resolution
sipcalc --resolve 192.168.1.0/24IdentifyDisplay help
sipcalc --helpIdentify