2620:10e:6000::/40 - MASONNET-V6
V6NetHandle: NET6-2620-10E-6000-1 OrgID: GMU Parent: NET6-2620-1 NetName: MASONNET-V6 NetRange: 2620:10E:6000:: - 2620:10E:60FF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: assignment OriginAS: 11279 Comment: http://www.gmu.edu RegDate: 2012-06-29 Updated: 2012-06-29 Source: ARIN OrgID: GMU OrgName: George Mason University CanAllocate: Street: 4400 University Drive City: Fairfax State/Prov: VA Country: US PostalCode: 22030 RegDate: 1986-06-13 Updated: 2017-05-15 OrgAdminHandle: BTA45-ARIN OrgTechHandle: JH2084-ARIN OrgNOCHandle: NOC11966-ARIN OrgAbuseHandle: ABUSE3233-ARIN OrgTechHandle: DANGT5-ARIN OrgTechHandle: XUQIA-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.