144.121.136.0/24

NetHandle:      NET-144-121-136-0-1
OrgID:          C06643784
Parent:         NET-144-121-0-0-1
NetName:        NET-144-121-136-0-24
NetRange:       144.121.136.0 - 144.121.136.255
NetType:        reassignment
OriginAS:       46887
Comment:        AS46887 NOC 24x7 +1 845 458 7799
RegDate:        2017-08-04
Updated:        2017-08-04
Source:         ARIN


OrgID:          C06643784
OrgName:        The Nature's Bounty Co.
CanAllocate:    
Street:         60 orville drive
City:           bohemia
State/Prov:     NY
Country:        US
PostalCode:     10716
RegDate:        2017-08-04
Updated:        2017-08-04
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.