V6NetHandle: NET6-2001-468-1800-1 OrgID: UPA Parent: NET6-2001-468-1 NetName: ABILENE-MAGPI-V6 NetRange: 2001:468:1800:: - 2001:468:18FF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: reallocation RegDate: 2007-04-27 Updated: 2014-12-05 TechHandle: OBRIE72-ARIN Source: ARIN OrgID: UPA OrgName: MAGPI c/o University of Pennsylvania CanAllocate: Street: 3401 Walnut Street Street: Suite 221A City: Philadelphia State/Prov: PA Country: US PostalCode: 19104-6228 RegDate: 2001-03-10 Updated: 2017-01-28 OrgAdminHandle: MW274-ARIN OrgNOCHandle: MCUP-ARIN OrgAbuseHandle: MW274-ARIN OrgTechHandle: MW274-ARIN OrgTechHandle: OBRIE72-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.