2604:3d80:400::/40 - QUALNET-V6-1
V6NetHandle: NET6-2604-3D80-1 OrgID: QUALCO Parent: NET6-2600-1 NetName: QUALNET-V6-1 NetRange: 2604:3D80:: - 2604:3D80:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: allocation OriginAS: 11030 RegDate: 2012-12-10 Updated: 2012-12-10 Source: ARIN OrgID: QUALCO OrgName: Qualcomm, Inc. CanAllocate: Street: 5775 Morehouse Drive City: San Diego State/Prov: CA Country: US PostalCode: 92121-1714 RegDate: 1970-01-01 Updated: 2018-05-18 OrgAdminHandle: HOSTM504-ARIN OrgTechHandle: GGR62-ARIN OrgTechHandle: IPMAN39-ARIN OrgAbuseHandle: ABUSE3300-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.