V6NetHandle: NET6-2001-500-C0-1 OrgID: ACC-308 Parent: NET6-2001-400-0 NetName: AFILIAS-NET6-5 NetRange: 2001:500:C0:: - 2001:500:DF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: assignment OriginAS: 12041 RegDate: 2011-04-06 Updated: 2012-03-20 Source: ARIN OrgID: ACC-308 OrgName: Afilias Canada, Corp. CanAllocate: Street: 4141 Yonge Street Street: Suite 204 City: Toronto State/Prov: ON Country: CA PostalCode: M2P-2A8 RegDate: 2006-04-21 Updated: 2017-01-28 OrgAbuseHandle: BEAVE4-ARIN OrgTechHandle: VLAAR-ARIN OrgTechHandle: CLEME4-ARIN OrgTechHandle: BEAVE4-ARIN OrgAbuseHandle: VLAAR-ARIN OrgNOCHandle: NOC11438-ARIN OrgAbuseHandle: CLEME4-ARIN OrgTechHandle: SILZE-ARIN OrgAdminHandle: HEL4-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.