NetHandle: NET-128-57-0-0-1 OrgID: SRIINT Parent: NET-128-0-0-0-0 NetName: DEMO-PR-2 NetRange: 18.104.22.168 - 22.214.171.124 NetType: assignment RegDate: 1984-11-09 Updated: 2011-02-03 Source: ARIN OrgID: SRIINT OrgName: SRI International CanAllocate: Street: 333 Ravenswood Avenue City: Menlo Park State/Prov: CA Country: US PostalCode: 94025 RegDate: 1970-01-01 Updated: 2011-09-24 OrgTechHandle: LS732-ARIN OrgAbuseHandle: HWB1-ARIN OrgTechHandle: HWB1-ARIN OrgAdminHandle: LS732-ARIN OrgAbuseHandle: LS732-ARIN Source: ARIN
IP address subranges within this IP range
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.