V6NetHandle: NET6-2606-4000-1 OrgID: RNYC Parent: NET6-2600-1 NetName: SIDERA-IPV6-01 NetRange: 2606:4000:: - 2606:4000:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: allocation OriginAS: 27506 RegDate: 2010-02-25 Updated: 2014-10-06 TechHandle: IPENG28-ARIN AbuseHandle: ABUSE4869-ARIN NOCHandle: NETWO7132-ARIN Source: ARIN OrgID: RNYC OrgName: Sidera Networks LLC CanAllocate: Street: 80 Central Street City: Boxborough State/Prov: MA Country: US PostalCode: 01719 RegDate: 2007-07-18 Updated: 2017-01-28 ReferralServer: rwhois://rwhois.electricfiber.net:4321 OrgAbuseHandle: ABUSE4869-ARIN OrgAdminHandle: IPENG28-ARIN OrgNOCHandle: NETWO7132-ARIN OrgTechHandle: IPENG28-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.