AS11242 Universidade Federal de Santa Catarina
2801:80:a80::/44 - ETM4
inetnum: 2801:80:a80::/44 status: assigned owner: Universidade Federal de Santa Catarina city: Florianópolis country: BR owner-c: ETM4 tech-c: ETM4 abuse-c: ETM4 inetrev: 2801:80:a80::/44 nserver: NS.POP-SC.RNP.BR nserver: ADNS1.POP-SC.RNP.BR nserver: ADNS2.POP-SC.RNP.BR created: 2014-05-27 changed: 2014-05-27 source: LACNIC nic-hdl: ETM4 person: Edison Tadeu Lopes Melo e-mail: ETM4@NUMERACAO.REGISTRO.BR address: Av. das Nações Unidas, 11541, 7º andar address: 04578-000 - Florianópolis - SC country: BR phone: +55 48 55093511  created: 20130306 changed: 20130308
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.