AS12189 PhoenixNAP LLC
2607:6000:100::/40 - PHOENIXNAP-V6
V6NetHandle: NET6-2607-6000-1 OrgID: PHOEN-56 Parent: NET6-2600-1 NetName: PHOENIXNAP-V6 NetRange: 2607:6000:: - 2607:600F:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: allocation RegDate: 2010-03-08 Updated: 2016-01-27 Source: ARIN OrgID: PHOEN-56 OrgName: PhoenixNAP LLC CanAllocate: Street: 3402 E. University Drive City: Phoenix State/Prov: AZ Country: US PostalCode: 85034 RegDate: 2009-07-23 Updated: 2017-01-28 ReferralServer: rwhois://rwhois.phoenixnap.com:4321 OrgAbuseHandle: ABUSE2349-ARIN OrgAdminHandle: ADMIN1723-ARIN OrgTechHandle: TECH357-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.