78.10.

openstack subnet set [-h] [--name <name>] [--dhcp | --no-dhcp]
                            [--dns-publish-fixed-ip | --no-dns-publish-fixed-ip]
                            [--gateway <gateway>]
                            [--network-segment <network-segment>]
                            [--description <description>] [--tag <tag>]
                            [--no-tag]
                            [--allocation-pool start=<ip-address>,end=<ip-address>]
                            [--no-allocation-pool]
                            [--dns-nameserver <dns-nameserver>]
                            [--no-dns-nameservers]
                            [--host-route destination=<subnet>,gateway=<ip-address>]
                            [--no-host-route] [--service-type <service-type>]
                            <subnet>