2606:fd00::/32 - BLUE-BLKV6-1
V6NetHandle: NET6-2606-FD00-1 OrgID: WFL-17 Parent: NET6-2600-1 NetName: BLUE-BLKV6-1 NetRange: 2606:FD00:: - 2606:FD00:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: allocation OriginAS: 11013, 16724, 26278, 29881, 12083 RegDate: 2012-02-17 Updated: 2018-08-27 TechHandle: KRB6-ARIN Source: ARIN OrgID: WFL-17 OrgName: WideOpenWest Finance LLC CanAllocate: Street: 1674 Frontenac Rd City: Naperville State/Prov: IL Country: US PostalCode: 60563 RegDate: 2014-03-05 Updated: 2017-01-28 ReferralServer: rwhois://rwhois.esnet.com:4321 OrgAbuseHandle: ABUSE3482-ARIN OrgTechHandle: NETAD67-ARIN OrgNOCHandle: SUPPO82-ARIN OrgTechHandle: ADAMS411-ARIN OrgAdminHandle: ADAMS411-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.