V6NetHandle: NET6-2620-150-2 OrgID: ALTICO-1 Parent: NET6-2620-1 NetName: ALTICORINCIPV6 NetRange: 2620:150:: - 2620:150:FFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: assignment OriginAS: 11870 RegDate: 2011-08-10 Updated: 2012-03-20 Source: ARIN OrgID: ALTICO-1 OrgName: ALTICOR INC CanAllocate: Street: 7575 East Fulton SE Street: Mail stop 21A-1R City: Ada State/Prov: MI Country: US PostalCode: 49355 RegDate: 2001-11-01 Updated: 2011-09-24 OrgTechHandle: WEBTE-ARIN OrgAdminHandle: WEBAD4-ARIN OrgAbuseHandle: WEBTE-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.