If you try to add new reverse zone in DNS using IPA Web UI, you are expected to input "Reverse zone IP network". If you input invalid network address (for example address prefix is missing) a nice red warning "Not a valid network address" is printed under the address input field.

It would be nice:

• to print exactly what is wrong with the address

OR

• to print one IPv4 and IPv6 network address example in expected format.

This can prevent the user confusion when he types in an invalid network address and point him to the mistake.

Tested with freeipa-server-3.1.4-1.fc18.x86_64