2001:468:600::/40 - ABILENE-NOX-V6
V6NetHandle: NET6-2001-468-600-1 OrgID: HARVAR Parent: NET6-2001-468-1 NetName: ABILENE-NOX-V6 NetRange: 2001:468:600:: - 2001:468:6FF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: reallocation RegDate: 2005-03-02 Updated: 2005-03-02 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.