V6NetHandle: NET6-2620-DE0-1 OrgID: CIR Parent: NET6-2620-1 NetName: NET-CIRR-V6-0 NetRange: 2620:0:DE0:: - 2620:0:DE0:FFFF:FFFF:FFFF:FFFF:FFFF NetType: assignment OriginAS: 10598 RegDate: 2008-08-25 Updated: 2012-03-02 TechHandle: ES158-ARIN NOCHandle: ES158-ARIN AbuseHandle: ES158-ARIN Source: ARIN OrgID: CIR OrgName: Central Iowa (Model) Railroad CanAllocate: Street: P.O.Box 868013 City: Plano State/Prov: TX Country: US PostalCode: 75086-8013 RegDate: 1990-01-10 Updated: 2011-09-24 OrgAdminHandle: ES158-ARIN OrgTechHandle: ES158-ARIN OrgAbuseHandle: ES158-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.