--- service: i.root-servers.net start-period: '2015-06-21T00:00:00Z' end-period: '2015-06-21T23:59:59Z' metric: traffic-volume dns-udp-queries-received-ipv4: 3052713629 dns-udp-queries-received-ipv6: 223002496 dns-tcp-queries-received-ipv4: 9892427 dns-tcp-queries-received-ipv6: 250156 dns-udp-responses-sent-ipv4: 3017287612 dns-udp-responses-sent-ipv6: 227344287 dns-tcp-responses-sent-ipv4: 9873872 dns-tcp-responses-sent-ipv6: 251816