188.8.131.52/21 - NET-65-17-123-0
NetHandle: NET-65-17-123-0-1 OrgID: C00814709 Parent: NET-65-16-0-0-1 NetName: NET-65-17-123-0 NetRange: 184.108.40.206 - 220.127.116.11 NetType: reassignment RegDate: 2004-05-02 Updated: 2004-07-02 Source: ARIN OrgID: C00814709 OrgName: Sherman Service Machine Products CanAllocate: Street: 2233 Cassens Dr City: Fenton State/Prov: MO Country: US PostalCode: 63026 RegDate: 2004-05-02 Updated: 2011-03-19 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.