V6NetHandle: NET6-2610-108-1 OrgID: UDT-6 Parent: NET6-2610-1 NetName: US-DEPARTMENT-OF-THE-TREASURY NetRange: 2610:108:: - 2610:108:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: allocation RegDate: 2006-10-27 Updated: 2012-03-02 Source: ARIN OrgID: UDT-6 OrgName: US Department of the Treasury CanAllocate: Street: OCIO Street: 1750 Pennsylvania Ave., NW City: Washington State/Prov: DC Country: US PostalCode: 20006 RegDate: 1999-06-23 Updated: 2017-01-28 OrgAdminHandle: ARCAD-ARIN OrgAbuseHandle: SOC35-ARIN OrgTechHandle: DLS46-ARIN OrgNOCHandle: SOC35-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.