AS10507 Sprint Personal Communications Systems
2600:6:ff84::/48 - SPRINT-ATLANTA-POP
V6NetHandle: NET6-2600-6-FF84-1 OrgID: SAP-51 Parent: NET6-2600-2 NetName: SPRINT-ATLANTA-POP NetRange: 2600:6:FF84:: - 2600:6:FF84:FFF:FFFF:FFFF:FFFF:FFFF NetType: reassignment RegDate: 2017-10-17 Updated: 2017-10-17 Source: ARIN OrgID: SAP-51 OrgName: Sprint Atlanta POP CanAllocate: Street: Sprint Atlanta POP City: Atlanta State/Prov: GA Country: US PostalCode: 30310 RegDate: 2013-12-05 Updated: 2013-12-05 OrgTechHandle: SIE-ARIN OrgAbuseHandle: SIE-ARIN OrgAdminHandle: SIE-ARIN Source: ARIN
IP address ranges, or netblocks, are groups of related IP addresses. They are usually represented as a base IP address, followed by a slash, and then a netmask which represents how many IP addresses are contained within the netblock. This format is known as CIDR. You'll also sometimes see netblocks given as a start ip address, and an end ip address, or an ip address range.
Traffic works its way around the internet based on the routing table, which contains a list of networks and their associated netblocks.