V6NetHandle: NET6-2001-4D0-1 OrgID: NASA Parent: NET6-2001-400-0 NetName: NASA-PCCA-V6 NetRange: 2001:4D0:: - 2001:4D0:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: allocation RegDate: 2002-05-01 Updated: 2002-11-14 TechHandle: ZN7-ARIN Source: ARIN OrgID: NASA OrgName: National Aeronautics and Space Administration CanAllocate: Street: IS05/Office of the Chief Information Officer City: MSFC State/Prov: AL Country: US PostalCode: 35812 RegDate: 1970-01-01 Updated: 2017-01-28 OrgNOCHandle: NISN-ARIN OrgAdminHandle: CST57-ARIN OrgAbuseHandle: NASAA-ARIN OrgTechHandle: IPAMO-ARIN OrgTechHandle: RFBJ-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.