2620:10a:e000::/40 - TRI-STATE-GENERATION-AND-TRANSMISSION
V6NetHandle: NET6-2620-10A-E000-1 OrgID: TRISTA-6 Parent: NET6-2620-1 NetName: TRI-STATE-GENERATION-AND-TRANSMISSION NetRange: 2620:10A:E000:: - 2620:10A:E0FF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: assignment OriginAS: 11250 RegDate: 2012-02-15 Updated: 2012-02-15 Source: ARIN OrgID: TRISTA-6 OrgName: Tri-State Generation and Transmission Association, Inc. CanAllocate: Street: 1100 w 116th Ave City: Westminster State/Prov: CO Country: US PostalCode: 80234 RegDate: 1994-09-06 Updated: 2012-01-27 OrgTechHandle: NETWO4529-ARIN OrgAdminHandle: NETWO4529-ARIN OrgAbuseHandle: NETWO4529-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.