I have these ranges:
2600:380:F510::1 - 2600:380:F51F:FFFF:FFFF:FFFF:FFFF:FFFE
32.0.0.0 - 32.255.255.255

And I want to be able to insert them and get the right CIDR for them.

Cacti plugin manager write that:
Not Compatible
I Change setup.php and add file INFO.
After this I install plugin, but have html and jquery error.
Help fix and prepare the plug-in to the new version Cacti.
I have make some change. Now plugin install and work? but i think that I have some mistake. Please repear me.
ipsubnet.zip

The subnet calculator would be even more useful if you could pass variables in the link to it in the form of
https://cactiserver/cacti/plugins/ipsubnet/ipsubnet.php?IP=192.168.1.10/22

That way we could have links to specific subnets in our documentation and open the calculator with all the fields already filled out!

It would be nice to have the next function below embedded into this project in some way.
I am working with maxmind Country lite DB and they store IPv4 and IPv6 on the same DB.
For the data structure too stay consistent the library or the DB file stores the IPv4 in a 16 Bytes array instead of a 4 Bytes array.
The original IPv4 CIDR address is: 1.0.128.0/17 However when I represent it as an IPv6 I recieve the next string: ::100:8000/113 .
The Bytes array of this address is : [0 0 0 0 0 0 0 0 0 0 0 0 1 0 128 0]
Since I am working with GoLang the only way I found was to write my own functions to convert this value into a visible IPv4 CIDR.

The next is my functions sources:

var v4InV6Array = []byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}

func hasEmptyLeadingBytes(ip net.IP) bool {
	return equal(v4InV6Array, ip[0:12])
}

func fakeIPv6ToIPv4(ip net.IP) net.IP {
	if hasEmptyLeadingBytes(ip.To16()) {
		return ip[12:16]
	}
	return nil
}

func convertFakeV6ToV4(ip *net.IPNet) *net.IPNet {
	if hasEmptyLeadingBytes(ip.IP.To16()) {
		return &net.IPNet{IP: ip.IP[12:16], Mask: ip.Mask}
	}
	return ip
}