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I'm using sipcalc for automated DNSxL updates/maintenance, so I wrote a SlackBuild script for Slackware Linux users, available here: http://slackbuilds.org/repository/14.1/network/sipcalc/

This is a very useful tool. Could upgrade to support subnet from /64 to /127 ?

When using sipcalc to split a network, the output does not show any of the resulting subnets in CIDR format. Instead, the section headers confusingly prints out the CIDR provided on the cmdline. For example:

$ sipcalc -s /17 -u 192.168.0.0/16  | grep /
-[ipv4 : 192.168.0.0/16] - 0
-[ipv4 : 192.168.0.0/16] - 0
-[ipv4 : 192.168.0.0/16] - 0

I see two potential ways to fix this:

1. Add CIDR notation as an output line to print_cidr_info_v4
2. Change the section header to reflect the subnet being printed. (e.g. with the above cmdline you'd see section headers:

   -[ipv4 : 192.168.0.0/17] - 0
   -[ipv4 : 192.168.0.128/17] - 0
   

I can supply a PR with either or both of these changes if you can share which you'd prefer.

sipcalc 2001:dead:beaf:dead:beaf:dead:beaf::/128
cause an error
-[ERR : Unable to retrieve interface information]

in my point of view it should at least interpreted as
sipcalc 2001:dead:beaf:dead:beaf:dead:beaf:0/128
which resolve fine.

Because why not? Sometimes pathological software stores them that way, and it'd be handy to be able to convert quickly and do the usual sipcalc maths on them.