74.112.19.0/24

NetHandle:      NET-74-112-19-0-1
OrgID:          C02515439
Parent:         NET-74-112-16-0-1
NetName:        SAN-ISABEL-TELECOM-INC
NetRange:       74.112.19.0 - 74.112.19.255
NetType:        reassignment
OriginAS:       33140
RegDate:        2010-06-08
Updated:        2010-06-08
Source:         ARIN


OrgID:          C02515439
OrgName:        San Isabel WiMAX DHCP
CanAllocate:    
Street:         570 Lindbergh Drive
City:           Gypsum
State/Prov:     CO
Country:        US
PostalCode:     81637
RegDate:        2010-06-08
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.