AS10255 Sinister Networks
2605:6c00:9::/48 - CORESITE-CUSTOMER-V6
V6NetHandle: NET6-2605-6C00-1 OrgID: COWIL Parent: NET6-2600-1 NetName: CORESITE-CUSTOMER-V6 NetRange: 2605:6C00:: - 2605:6C00:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: allocation RegDate: 2010-08-05 Updated: 2012-12-10 Source: ARIN OrgID: COWIL OrgName: CoreSite CanAllocate: Street: 1001 17th St Street: Suite 500 City: Denver State/Prov: CO Country: US PostalCode: 80202 RegDate: 2005-01-14 Updated: 2018-11-16 OrgTechHandle: CMM8-ARIN OrgNOCHandle: CORES4-ARIN OrgTechHandle: JENSE37-ARIN OrgTechHandle: REEDC55-ARIN OrgAbuseHandle: CORES5-ARIN OrgAdminHandle: JFA116-ARIN OrgTechHandle: JFA116-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.