126.96.36.199/21 - IAN
inetnum: 191.253.224/19 status: allocated owner: CILNET Comunicacao e Informatica LTDA. city: Cerquilho country: BR owner-c: IAN tech-c: DZA2 abuse-c: IAN inetrev: 191.253.224/19 nserver: SERVER2.FASTERNET.COM.BR nserver: SERVER3.FASTERNET.COM.BR created: 2014-01-16 changed: 2014-01-20 source: LACNIC
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.