V6NetHandle: NET6-2001-480-1 OrgID: V6HP Parent: NET6-2001-400-0 NetName: DREN-V6 NetRange: 2001:480:: - 2001:480:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: allocation RegDate: 2001-06-14 Updated: 2012-03-02 TechHandle: RLB3-ARIN Source: ARIN OrgID: V6HP OrgName: High Performance Computing CanAllocate: Street: 10501 Furnace Road Street: Suite 101 City: Lorton State/Prov: VA Country: US PostalCode: 22079 RegDate: 2001-06-14 Updated: 2013-04-25 OrgAdminHandle: MIL-HSTMST-ARIN OrgTechHandle: RLB3-ARIN OrgAbuseHandle: RLB3-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.