AS19982 Towerstream I, Inc.
2604:f400:6::/48 - MIA0001
V6NetHandle: NET6-2604-F400-6-1-1 OrgID: C05704013 Parent: NET6-2604-F400-1 NetName: MIA0001 NetRange: 2604:F400:6:1:: - 2604:F400:6:1:FFFF:FFFF:FFFF:FFFF NetType: reassignment OriginAS: 19982 RegDate: 2015-04-28 Updated: 2015-04-28 Source: ARIN OrgID: C05704013 OrgName: MIA0001 CanAllocate: Street: 1111 Brickell Avenue City: Miami State/Prov: FL Country: US PostalCode: 33131 RegDate: 2015-04-28 Updated: 2015-04-28 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.