2620:109:40::/43 - NET6-2620-1
V6NetHandle: NET6-2620-109-1 OrgID: OPM-2 Parent: NET6-2620-1 NetName: NET6-2620-1 NetRange: 2620:109:: - 2620:109:FF:FFFF:FFFF:FFFF:FFFF:FFFF NetType: assignment OriginAS: 3356 RegDate: 2011-12-01 Updated: 2015-01-16 NOCHandle: NETOP215-ARIN TechHandle: NETOP215-ARIN AbuseHandle: NETOP215-ARIN Source: ARIN OrgID: OPM-2 OrgName: Office of Personnel Management CanAllocate: Street: 1900 E Street NW City: Washington State/Prov: DC Country: US PostalCode: 20415 RegDate: 2004-01-06 Updated: 2012-10-26 OrgTechHandle: TECHN402-ARIN OrgAbuseHandle: ABUSE1225-ARIN OrgTechHandle: NETOP215-ARIN OrgAdminHandle: ADMIN848-ARIN OrgNOCHandle: NOC2154-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.