2001:4868:501::/48 - TERRENAP-V6
V6NetHandle: NET6-2001-4868-1 OrgID: MCICS Parent: NET6-2001-4800-0 NetName: TERRENAP-V6 NetRange: 2001:4868:: - 2001:4868:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: allocation Comment: For abuse concerns, please contact email@example.com RegDate: 2005-03-14 Updated: 2017-12-01 Source: ARIN OrgID: MCICS OrgName: MCI Communications Services, Inc. d/b/a Verizon Business CanAllocate: Street: 22001 Loudoun County Pkwy City: Ashburn State/Prov: VA Country: US PostalCode: 20147 RegDate: 2006-05-30 Updated: 2018-01-17 OrgTechHandle: SWIPP-ARIN OrgAbuseHandle: ABUSE3-ARIN OrgTechHandle: SWIPP9-ARIN OrgAdminHandle: VIS1-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.