perl-Net-Netmask from devel:languages:perl:CPAN-N project

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For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/devel:languages:perl:CPAN-N/openSUSE_Tumbleweed/devel:languages:perl:CPAN-N.repo
zypper refresh
zypper install perl-Net-Netmask