184.187.64.0/20

NetHandle:      NET-184-187-64-0-1
OrgID:          C02620733
Parent:         NET-184-176-0-0-1
NetName:        NETBLK-HR-CBS-VOIP-184-187-64-0
NetRange:       184.187.64.0 - 184.187.79.255
NetType:        reassignment
RegDate:        2010-10-30
Updated:        2010-10-30
Source:         ARIN


OrgID:          C02620733
OrgName:        Cox Communications
CanAllocate:    
Street:         1400 Lake Hearn Dr
City:           Atlanta
State/Prov:     GA
Country:        US
PostalCode:     30319
RegDate:        2010-10-30
Updated:        2011-03-19
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.