2604:b300:ad03::/48 - ADTI-IPV6
V6NetHandle: NET6-2604-B300-1 OrgID: ADTI Parent: NET6-2600-1 NetName: ADTI-IPV6 NetRange: 2604:B300:: - 2604:B300:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: allocation OriginAS: 19271, 19292 RegDate: 2011-05-05 Updated: 2012-03-02 Source: ARIN OrgID: ADTI OrgName: American Data Technology, Inc. CanAllocate: Street: PO Box 12892 City: Research Triangle Park State/Prov: NC Country: US PostalCode: 27709 RegDate: 1995-11-17 Updated: 2017-01-28 OrgAdminHandle: NOCN-ARIN OrgNOCHandle: NOCN-ARIN OrgAbuseHandle: NOCN-ARIN OrgTechHandle: NOCN-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.