V6NetHandle: NET6-2620-400-1 OrgID: FORDMO Parent: NET6-2620-1 NetName: FINET-IPV6 NetRange: 2620:0:400:: - 2620:0:4FF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: assignment RegDate: 2007-05-14 Updated: 2007-05-14 Source: ARIN OrgID: FORDMO OrgName: Ford Motor Company CanAllocate: Street: P.O. Box 2053, RM E-1121 City: Dearborn State/Prov: MI Country: US PostalCode: 48121-2053 RegDate: 1970-01-01 Updated: 2011-05-17 OrgAdminHandle: ZF4-ARIN OrgTechHandle: ZF4-ARIN OrgNOCHandle: ZF4-ARIN OrgAbuseHandle: ZF4-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.