niconiconiTIL IP address 0 in a subnet is reserved because 4.2BSD once used it as a broadcast address, it stopped being a thing even in 4.3BSD, but everyone copied 4.3BSD so it remains reserved today.
GNU social JP is a social network, courtesy of GNU social JP管理人. It runs on GNU social, version 2.0.2-dev, available under the GNU Affero General Public License.
All GNU social JP content and data are available under the Creative Commons Attribution 3.0 license.