V6NetHandle: NET6-2620-1B-1 OrgID: JRC-19 Parent: NET6-2620-1 NetName: JRC-GLOBALV6-1 NetRange: 2620:1B:: - 2620:1B:F:FFFF:FFFF:FFFF:FFFF:FFFF NetType: assignment OriginAS: 17103 Comment: http://www.jensenresearch.com RegDate: 2010-12-27 Updated: 2013-09-19 Source: ARIN OrgID: JRC-19 OrgName: Jensen Research Corporation CanAllocate: Street: 70 Hilltop Road, Suite 2200 City: Ramsey State/Prov: NJ Country: US PostalCode: 07446 RegDate: 2005-02-14 Updated: 2011-09-24 OrgTechHandle: EJ192-ARIN OrgNOCHandle: NETWO768-ARIN OrgAbuseHandle: EJ192-ARIN OrgAdminHandle: FRANZ4-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.