For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:aeneas_jaissle/openSUSE_Tumbleweed/home:aeneas_jaissle.repo
zypper refresh
zypper install ipset
For 16.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:aeneas_jaissle/16.0/home:aeneas_jaissle.repo
zypper refresh
zypper install ipset
For 15.7 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:aeneas_jaissle/15.7/home:aeneas_jaissle.repo
zypper refresh
zypper install ipset
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:aeneas_jaissle/15.6/home:aeneas_jaissle.repo
zypper refresh
zypper install ipset