V6NetHandle: NET6-2620-10D-2000-1 OrgID: NORTHW-9 Parent: NET6-2620-1 NetName: NORTHWESTERN-V6 NetRange: 2620:10D:2000:: - 2620:10D:20FF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: assignment OriginAS: 103 RegDate: 2012-05-24 Updated: 2012-05-24 Source: ARIN OrgID: NORTHW-9 OrgName: Northwestern University CanAllocate: Street: Leverone Hall #G-166 Street: 2001 Sheridan Rd City: Evanston State/Prov: IL Country: US PostalCode: 60208 RegDate: 1970-01-01 Updated: 2012-05-11 OrgAdminHandle: NTN7-ARIN OrgAbuseHandle: NUNS-ARIN OrgTechHandle: NUNA-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.