2600:6:ff05::/48 - SPRINT-ENGLEWOOD-POP
V6NetHandle: NET6-2600-6-FF05-1 OrgID: SEP-31 Parent: NET6-2600-2 NetName: SPRINT-ENGLEWOOD-POP NetRange: 2600:6:FF05:: - 2600:6:FF05:FFF:FFFF:FFFF:FFFF:FFFF NetType: reassignment RegDate: 2017-10-16 Updated: 2017-10-16 Source: ARIN OrgID: SEP-31 OrgName: Sprint Englewood POP CanAllocate: Street: Sprint Englewood POP City: Englewood State/Prov: CO Country: US PostalCode: 80112 RegDate: 2013-12-06 Updated: 2013-12-06 OrgAdminHandle: SIE-ARIN OrgTechHandle: SIE-ARIN OrgAbuseHandle: 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.