AS12915 EPAG Domainservices GmbH
2604:4000:8000::/48 - TUCOWS-IPV6-BLK1
V6NetHandle: NET6-2604-4000-1 OrgID: TUCOW Parent: NET6-2600-1 NetName: TUCOWS-IPV6-BLK1 NetRange: 2604:4000:: - 2604:4000:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: allocation OriginAS: 32491, 15348 RegDate: 2010-02-18 Updated: 2013-01-09 TechHandle: DIACO-ARIN NOCHandle: NOC12422-ARIN TechHandle: OPERA26-ARIN AbuseHandle: AST147-ARIN Source: ARIN OrgID: TUCOW OrgName: Tucows.com Co. CanAllocate: Street: 96 Mowat Avenue City: Toronto State/Prov: ON Country: CA PostalCode: M6K-3M1 RegDate: 2006-02-07 Updated: 2018-10-15 OrgTechHandle: LEHEU-ARIN OrgAdminHandle: OPERA30-ARIN OrgTechHandle: NOC2038-ARIN OrgAbuseHandle: AST147-ARIN OrgNOCHandle: NOC12422-ARIN OrgTechHandle: OPERA26-ARIN OrgTechHandle: DIACO-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.