V6NetHandle: NET6-2606-4100-1 OrgID: USNH Parent: NET6-2600-1 NetName: UNH NetRange: 2606:4100:: - 2606:4100:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: allocation OriginAS: 11745 RegDate: 2011-10-27 Updated: 2012-03-02 Source: ARIN OrgID: USNH OrgName: University System of New Hampshire CanAllocate: Street: University of New Hampshire Street: 50 College Road City: Durham State/Prov: NH Country: US PostalCode: 03824 RegDate: 1998-12-04 Updated: 2018-01-19 OrgAbuseHandle: ABUSE1853-ARIN OrgAdminHandle: HEATO14-ARIN OrgTechHandle: TBA102-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.