AS12182 Internap Corporation
2604:1900::/40 - SNJSCA01
V6NetHandle: NET6-2604-1900-1 OrgID: JC-2 Parent: NET6-2600-1 NetName: SNJSCA01 NetRange: 2604:1900:: - 2604:1900:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: allocation RegDate: 2011-03-24 Updated: 2012-02-24 Source: ARIN OrgID: JC-2 OrgName: Jolokia Corporation CanAllocate: Street: 245-M Mount Hermon Road Street: Suite 152 City: Scotts Valley State/Prov: CA Country: US PostalCode: 95066 RegDate: 2011-01-04 Updated: 2017-01-28 OrgNOCHandle: NOC11735-ARIN OrgAbuseHandle: NOC11735-ARIN OrgAdminHandle: ADMIN2400-ARIN OrgTechHandle: NOC11735-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.