sci-hub.io is down. Use the IP address directly:
# echo '31.184.194.81 sci-hub.io' >> /etc/hosts
# echo '31.184.194.81 sci-hub.org' >> /etc/hosts
# echo '31.184.194.81 sci-hub.club' >> /etc/hosts
Alternative option: scihub22266oqcxt.onion
sci-hub.io is down. Use the IP address directly:
# echo '31.184.194.81 sci-hub.io' >> /etc/hosts
# echo '31.184.194.81 sci-hub.org' >> /etc/hosts
# echo '31.184.194.81 sci-hub.club' >> /etc/hosts
Alternative option: scihub22266oqcxt.onion