2620:10a:30f0::/48 - TULANE
V6NetHandle: NET6-2620-10A-3000-1 OrgID: TULANE Parent: NET6-2620-1 NetName: TULANE NetRange: 2620:10A:3000:: - 2620:10A:30FF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: assignment OriginAS: 10349 RegDate: 2012-01-19 Updated: 2012-01-19 Source: ARIN OrgID: TULANE OrgName: Tulane University CanAllocate: Street: 6823 St. Charles Ave. City: New Orleans State/Prov: LA Country: US PostalCode: 70118 RegDate: 1987-10-11 Updated: 2011-09-24 OrgTechHandle: TD138-ARIN OrgAdminHandle: TD138-ARIN OrgAbuseHandle: TD138-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.