--- service: i.root-servers.net start-period: '2013-09-16T00:00:00Z' end-period: '2013-09-17T00:00:01Z' metric: traffic-volume dns-udp-queries-received-ipv4: 2258472948 dns-udp-queries-received-ipv6: 153495797 dns-tcp-queries-received-ipv4: 4095536 dns-tcp-queries-received-ipv6: 116288 dns-udp-responses-sent-ipv4: 2260603759 dns-udp-responses-sent-ipv6: 160183570 dns-tcp-responses-sent-ipv4: 4112876 dns-tcp-responses-sent-ipv6: 144590