2620:1d0:5f::/48 - GE-IP6
V6NetHandle: NET6-2620-1D0-2 OrgID: GENER-284 Parent: NET6-2620-1 NetName: GE-IP6 NetRange: 2620:1D0:: - 2620:1D0:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: assignment RegDate: 2012-01-31 Updated: 2015-08-24 Source: ARIN OrgID: GENER-284 OrgName: General Electric Company CanAllocate: Street: 3135 Easton Turnpike City: Farifield State/Prov: CT Country: US PostalCode: 06828 RegDate: 2009-09-23 Updated: 2011-11-08 OrgAbuseHandle: GET2-ORG-ARIN OrgTechHandle: GET2-ORG-ARIN OrgAdminHandle: GET2-ORG-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.