subnetcalc.py is a handy IP Analyser and Subnet Calculator tool for IPv4 and IPv6. It is written in the Python3 programming language and requires python 3.6 or higher.
On GNU/Linux simply copy the subnetcalc.py file to the user ~/bin/ directory and execute as shown. On Windows I guess you have to prepend each command with python.
It can analyse and IP address or subnet and return data on it, additionally subnets from each network can be generated to the depth required. The embedded help function lists the options available.
~ $ subnetcalc.py --help
[ Help ]
--------
subnetcalc.py [OPTIONS]
OPTIONS:
IP Address or Network : --ipaddr,-i <IP address>
Subnet mask (IPv4 only) : --mask,-m <mask>
Subnets prefix : --subnet, -s <Subnet prefix>
Include reverse pointer : --reverse-pointer, -r
Help : --help, -h
Consider the output for an IP address with a subnet mask. The IP address is broken down into its parts and status information on the particular address is given.
~ $ subnetcalc.py -i 196.203.4.67 -m 255.255.255.0 Summary for 196.203.4.67/255.255.255.0 -------------------------------------- IP Version : 4 IP Prefix : 24 IP Address : 196.203.4.67/24 IP Network : 196.203.4.0/24 Address Status: Global
It is also possible to add the subnetmask using slash notation.
~ $ subnetcalc.py -i 196.203.4.67/255.255.255.0 Summary for 196.203.4.67/255.255.255.0 -------------------------------------- IP Version : 4 IP Prefix : 24 IP Address : 196.203.4.67/24 IP Network : 196.203.4.0/24 Address Status: Global
Alternatively Classless Inter Domain Routing (CIDR) format can be applied.
~ $ subnetcalc.py -i 196.203.4.67/24 Summary for 196.203.4.67/24 --------------------------- IP Version : 4 IP Prefix : 24 IP Address : 196.203.4.67/24 IP Network : 196.203.4.0/24 Address Status: Global
The Reverse Pointer address can be requested of the IP is an address and not a network.
~ $ subnetcalc.py -i 196.203.4.67/24 -r Summary for 196.203.4.67/24 --------------------------- IP Version : 4 IP Prefix : 24 IP Address : 196.203.4.67/24 Reverse pointer : 67.4.203.196.in-addr.arpa IP Network : 196.203.4.0/24 Address Status : Global ~ $ subnetcalc.py -i 2002:5:192::/60 -r Summary for 2002:5:192::/60 --------------------------- IP Version : 6 IP Prefix : 60 IP Network : 2002:5:192::/60 Reverse pointer : 0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.9.1.0.5.0.0.0.2.0.0.2.ip6.arpa IP Network : 2002:5:192::/60 Address Status : Global
It works equally well with IPv6 addresses and will automatically compress IPv6 addresses in the output.
~ $ subnetcalc.py -i 2001:db8::/64 Summary for 2001:db8::/64 ------------------------- IP Version : 6 IP Prefix : 64 IP Network : 2001:db8::/64 IP Network : 2001:db8::/64 Address Status: Documentation, Private dobriain@riomhaire-E550 ~ $ subnetcalc.py -i ff02:2::/64 Summary for ff02:2::/64 ----------------------- IP Version : 6 IP Prefix : 64 IP Network : ff02:2::/64 IP Network : ff02:2::/64 Address Status: Multicast, Global ~ $ subnetcalc.py -i 2002:0005:0192:0000::/60 Summary for 2002:0005:0192:0000::/60 ------------------------------------ IP Version : 6 IP Prefix : 60 IP Network : 2002:5:192::/60 IP Network : 2002:5:192::/60 Address Status: Global
Calculating subnets for a prefix that is longer than the prefix given with the IP address can be calculated too.
~ $ subnetcalc.py -i 196.203.4.0/24 -s 26 Summary for 196.203.4.0/24 -------------------------- IP Version : 4 IP Prefix : 24 IP Network : 196.203.4.0/24 IP Network : 196.203.4.0/24 Address Status: Global Are you ready for the subnets? Subnets for 196.203.4.0/24 -------------------------- 196.203.4.0/26 196.203.4.64/26 196.203.4.128/26 196.203.4.192/26
and here is an example for IPv6.
~ $ subnetcalc.py -i 2002:5:192::/60 -s 64 Summary for 2002:5:192::/60 --------------------------- IP Version : 6 IP Prefix : 60 IP Network : 2002:5:192::/60 IP Network : 2002:5:192::/60 Address Status: Global Are you ready for the subnets? Subnets for 2002:5:192::/60 --------------------------- 2002:5:192::/64 2002:5:192:1::/64 2002:5:192:2::/64 2002:5:192:3::/64 2002:5:192:4::/64 2002:5:192:5::/64 2002:5:192:6::/64 2002:5:192:7::/64 2002:5:192:8::/64 2002:5:192:9::/64 2002:5:192:a::/64 2002:5:192:b::/64 2002:5:192:c::/64 2002:5:192:d::/64 2002:5:192:e::/64 2002:5:192:f::/64