V6NetHandle: NET6-2620-5300-1 OrgID: UMBCU Parent: NET6-2620-1 NetName: UMBC-EDU NetRange: 2620:0:5300:: - 2620:0:530F:FFFF:FFFF:FFFF:FFFF:FFFF NetType: assignment RegDate: 2010-08-06 Updated: 2012-03-02 Source: ARIN OrgID: UMBCU OrgName: University of Maryland Baltimore County (UMBC) CanAllocate: Street: 1000 Hilltop Circle City: Baltimore State/Prov: MD Country: US PostalCode: 21250 Comment: For Security Complaints Contact firstname.lastname@example.org RegDate: 1998-04-20 Updated: 2014-12-29 OrgAdminHandle: JJS41-ARIN OrgAbuseHandle: MC712-ARIN OrgTechHandle: MC712-ARIN OrgTechHandle: DOYLE181-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.