inetnum: 2801:82::/32 aut-num: AS10881 abuse-c: REP143 owner: FUNPAR - Fundacao da UFPR para o DCTC ownerid: 78.350.188/0001-95 responsible: Ponto de Presença da RNP no Paraná country: BR owner-c: REP143 tech-c: REP143 inetrev: 2801:82::/40 nserver: ns.pop-pr.rnp.br nsstat: 20170306 AA nslastaa: 20170306 nserver: ns2.pop-pr.rnp.br nsstat: 20170306 AA nslastaa: 20170306 created: 20100224 changed: 20130308 nic-hdl-br: REP143 person: Registro POP-PR.RNP.BR e-mail: email@example.com country: BR created: 20020910 changed: 20090325
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.