2801:8e::/32 - BAB12
inetnum: 2801:8e::/32 aut-num: AS11993 abuse-c: BABRA22 owner: BANCO DO BRASIL S.A. ownerid: 00.000.000/0001-91 responsible: Luiz Felipe de Oliveira owner-c: BABRA22 tech-c: EKF14 created: 20101222 changed: 20130308 nic-hdl-br: BABRA22 person: Banco do Brasil created: 20110915 changed: 20161027 nic-hdl-br: EKF14 person: Elvis Kleber de A Figueiredo created: 20040722 changed: 20120606
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.