2600:3000:1b04::/48 - VIAWEST-IPV6-BLK-1
V6NetHandle: NET6-2600-3000-1 OrgID: VINS Parent: NET6-2600-1 NetName: VIAWEST-IPV6-BLK-1 NetRange: 2600:3000:: - 2600:3007:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: allocation OriginAS: 18565, 36123, 32868, 13845, 29699, 10628, 13649 RegDate: 2010-11-10 Updated: 2012-03-02 Source: ARIN OrgID: VINS OrgName: ViaWest CanAllocate: Street: 6400 South Fiddler's Green Circle Street: Suite 2000 City: Greenwood Village State/Prov: CO Country: US PostalCode: 80111 RegDate: 2000-04-24 Updated: 2019-04-01 ReferralServer: rwhois://rwhois.viawest.net:4321 OrgAdminHandle: DTR20-ARIN OrgTechHandle: ROUTI1-ARIN OrgAbuseHandle: ZP76-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.