2001:18f0::/32 - ILAPIPV6
V6NetHandle: NET6-2001-18F0-1 OrgID: ILAP Parent: NET6-2001-1800-0 NetName: ILAPIPV6 NetRange: 2001:18F0:: - 2001:18F0:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: allocation OriginAS: 12059 RegDate: 2004-01-05 Updated: 2014-09-15 Source: ARIN OrgID: ILAP OrgName: Internet Light and Power Inc. CanAllocate: Street: 210 Sheppard Avenue East City: Toronto State/Prov: ON Country: CA PostalCode: M2N-3A9 RegDate: 1999-04-06 Updated: 2017-01-28 OrgTechHandle: NOC32008-ARIN OrgNOCHandle: NOC32008-ARIN OrgAdminHandle: TGO65-ARIN OrgAbuseHandle: NOC32008-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.