inetnum: 200.81.128/20 status: allocated owner: TELEFONICA-UNIDAD LARGA DISTANCIA city: Buenos Aires country: AR owner-c: GAU7 tech-c: GAU7 abuse-c: GAU7 inetrev: 200.81.128/20 nserver: DNS1.TIWS.COM.AR created: 2001-10-19 changed: 2018-05-02 source: LACNIC
IP Addresses in this 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.