AS10507 Sprint Personal Communications Systems
2600:6:ffc5::/48 - SPRINT-SPRINGFIELD-POP
V6NetHandle: NET6-2600-6-FFC5-8000-1 OrgID: SSP-116 Parent: NET6-2600-2 NetName: SPRINT-SPRINGFIELD-POP NetRange: 2600:6:FFC5:8000:: - 2600:6:FFC5:8FFF:FFFF:FFFF:FFFF:FFFF NetType: reassignment RegDate: 2017-10-19 Updated: 2017-10-19 Source: ARIN OrgID: SSP-116 OrgName: Sprint Springfield POP CanAllocate: Street: Sprint Springfield POP City: Springfield State/Prov: MA Country: US PostalCode: 01105 RegDate: 2013-12-06 Updated: 2013-12-06 OrgAbuseHandle: SIE-ARIN OrgTechHandle: 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.