2604:b180:240::/44 - SCN6-2604-B180-1
V6NetHandle: NET6-2604-B180-1 OrgID: SCNC-1 Parent: NET6-2600-1 NetName: SCN6-2604-B180-1 NetRange: 2604:B180:: - 2604:B180:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: allocation RegDate: 2013-04-25 Updated: 2017-06-13 Source: ARIN OrgID: SCNC-1 OrgName: Smart City Networks, L.P. CanAllocate: Street: 5795 W. Badura Ave. Ste.110 City: Las Vegas State/Prov: NV Country: US PostalCode: 89118 Comment: Smart City Networks Corporate Office. RegDate: 2002-09-26 Updated: 2017-04-05 OrgNOCHandle: SCN-ARIN OrgTechHandle: PETER334-ARIN OrgAdminHandle: DL571-ARIN OrgAbuseHandle: ABUSE4847-ARIN OrgTechHandle: YAUCH2-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.