V6NetHandle: NET6-2604-5400-1 OrgID: ATLAN-19 Parent: NET6-2600-1 NetName: ATLANTICBB-V6 NetRange: 2604:5400:: - 2604:5400:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: allocation OriginAS: 11776 Comment: For abuse related issues, contact email@example.com RegDate: 2010-06-22 Updated: 2012-03-02 TechHandle: IPADD2-ARIN NOCHandle: NOC1646-ARIN AbuseHandle: ABUSE619-ARIN Source: ARIN OrgID: ATLAN-19 OrgName: Atlantic Broadband Finance, LLC CanAllocate: Street: 120 Southmont Blvd City: Johnstown State/Prov: PA Country: US PostalCode: 15905 Comment: Please send all Abuse complaints to Comment: firstname.lastname@example.org RegDate: 2004-04-15 Updated: 2018-01-26 OrgTechHandle: RODEN41-ARIN OrgNOCHandle: NOC1646-ARIN OrgAbuseHandle: ABUSE619-ARIN OrgAdminHandle: MCMAS1-ARIN OrgTechHandle: IPADD2-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.