2605:100::/32 - NCSU-V6-00
V6NetHandle: NET6-2605-100-1 OrgID: NCSU Parent: NET6-2600-1 NetName: NCSU-V6-00 NetRange: 2605:100:: - 2605:100:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: allocation OriginAS: 11442 RegDate: 2011-05-31 Updated: 2012-03-02 Source: ARIN OrgID: NCSU OrgName: North Carolina State University CanAllocate: Street: Avent Ferry Technology Center, Box 7208 Street: 2114 Avent Ferry Road City: Raleigh State/Prov: NC Country: US PostalCode: 27606 RegDate: 1989-09-19 Updated: 2018-01-26 OrgNOCHandle: NOC1969-ARIN OrgNOCHandle: GAJ1-ARIN OrgAdminHandle: HOLDE158-ARIN OrgAbuseHandle: ABUSE2040-ARIN OrgTechHandle: HOS150-ORG-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.