2800:23::/32 - JFJ12
inetnum: 2800:20::/28 status: allocated aut-num: N/A owner: BT LATAM Venezuela, S.A. ownerid: VE-COVE4-LACNIC responsible: Gustavo Vera address: Av. Fco de Miranda, Torre Pqe Cristal, Torre Este, Mzz 2, Local 28 address: 1060 - Caracas - DF country: VE phone: +58 212 2854545  owner-c: JFJ12 tech-c: JFJ12 abuse-c: JFJ12 created: 20051214 changed: 20170322 nic-hdl: JFJ12 person: Juvenal de Freitas Carvalho Junior e-mail: juvenal.carvalho@BT.COM address: Av. Washington Luis, 2900, 141-1 address: 13042105 - Campinas - SP country: BR phone: +55 19 991246084  created: 20141103 changed: 20170322
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.