2620:4f:8000::/48 - AS112-PROJ-IPV6
V6NetHandle: NET6-2620-4F-8000-1 OrgID: OARCI Parent: NET6-2620-1 NetName: AS112-PROJ-IPV6 NetRange: 2620:4F:8000:: - 2620:4F:8000:FFFF:FFFF:FFFF:FFFF:FFFF NetType: assignment OriginAS: 112 Comment: http://public.as112.net/ RegDate: 2011-05-31 Updated: 2012-03-02 Source: ARIN OrgID: OARCI OrgName: DNS-OARC CanAllocate: Street: 325 S College Ave Street: Suite 101#5 City: Indianapolis State/Prov: IN Country: US PostalCode: 46203 RegDate: 2009-03-16 Updated: 2018-01-29 OrgTechHandle: OARCA-ARIN OrgNOCHandle: OARCA-ARIN OrgAdminHandle: OARCA-ARIN OrgAbuseHandle: OARCA-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.