AS10507 Sprint Personal Communications Systems
2600:6:ff03::/48 - SPRINT-SAINT-PAUL-POP
V6NetHandle: NET6-2600-6-FF03-4000-1 OrgID: SSPP Parent: NET6-2600-2 NetName: SPRINT-SAINT-PAUL-POP NetRange: 2600:6:FF03:4000:: - 2600:6:FF03:4FFF:FFFF:FFFF:FFFF:FFFF NetType: reassignment RegDate: 2017-10-19 Updated: 2017-10-19 Source: ARIN OrgID: SSPP OrgName: Sprint Saint Paul POP CanAllocate: Street: Sprint Saint Paul POP City: Saint Paul State/Prov: MN Country: US PostalCode: 55106 RegDate: 2013-12-06 Updated: 2013-12-06 OrgTechHandle: SIE-ARIN OrgAdminHandle: 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.