--- service: i.root-servers.net start-period: '2015-09-23T00:00:00Z' end-period: '2015-09-24T00:00:01Z' metric: traffic-volume dns-udp-queries-received-ipv4: 3878226715 dns-udp-queries-received-ipv6: 302432449 dns-tcp-queries-received-ipv4: 29428771 dns-tcp-queries-received-ipv6: 431891 dns-udp-responses-sent-ipv4: 3825258266 dns-udp-responses-sent-ipv6: 302770334 dns-tcp-responses-sent-ipv4: 29405157 dns-tcp-responses-sent-ipv6: 435525