2604:5880:3::/48 - STAFFORD-V6
V6NetHandle: NET6-2604-5880-1 OrgID: SC-9 Parent: NET6-2600-1 NetName: STAFFORD-V6 NetRange: 2604:5880:: - 2604:5880:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: allocation OriginAS: 10980 RegDate: 2013-01-07 Updated: 2013-01-07 Source: ARIN OrgID: SC-9 OrgName: Stafford Communications, Inc. CanAllocate: Street: PO Box 3044 City: Melfort State/Prov: SK Country: CA PostalCode: S0E 1A0 RegDate: 2011-03-28 Updated: 2017-01-28 OrgAdminHandle: NOC11131-ARIN OrgAbuseHandle: NOC11131-ARIN OrgTechHandle: NOC11131-ARIN OrgNOCHandle: NOC11131-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.