AS10578 Harvard University
2001:504:2e::/48 - NOX-IPV6-01
V6NetHandle: NET6-2001-504-2E-1 OrgID: HARVAR Parent: NET6-2001-400-0 NetName: NOX-IPV6-01 NetRange: 2001:504:2E:: - 2001:504:2E:FFFF:FFFF:FFFF:FFFF:FFFF NetType: allocation OriginAS: 10578 RegDate: 2013-04-15 Updated: 2013-04-15 Source: ARIN OrgID: HARVAR OrgName: Harvard University CanAllocate: Street: HUIT Network Services Street: Patrick McEvilly - Director Street: 784 Memorial Drive City: Cambridge State/Prov: MA Country: US PostalCode: 02139 RegDate: 1984-04-17 Updated: 2018-08-15 OrgTechHandle: PMC277-ARIN OrgAdminHandle: PMC277-ARIN OrgAbuseHandle: ABUSE3331-ARIN OrgTechHandle: LWS27-ARIN OrgNOCHandle: NETWO4930-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.