2620:10f:400f::/48 - FDC-V6-ISEC
V6NetHandle: NET6-2620-10F-4000-1 OrgID: FDC-63 Parent: NET6-2620-1 NetName: FDC-V6-ISEC NetRange: 2620:10F:4000:: - 2620:10F:400F:FFFF:FFFF:FFFF:FFFF:FFFF NetType: assignment OriginAS: 11273, 40466, 10390 Comment: www.firstdata.com RegDate: 2012-07-30 Updated: 2012-07-30 Source: ARIN OrgID: FDC-63 OrgName: First Data Corporation CanAllocate: Street: 7305 Pacific St Street: Stop Code S30 City: Omaha State/Prov: NE Country: US PostalCode: 68114-5403 RegDate: 2006-04-04 Updated: 2013-12-04 OrgTechHandle: FDCTE-ARIN OrgAbuseHandle: FDCAB-ARIN OrgAdminHandle: FDCAD-ARIN OrgNOCHandle: NESNO-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.