AS10143 Exetel Pty Ltd
2401:2580:3::/48 - CCG
inet6num: 2401:2580::/32 netname: CCG descr: Cater Care Group Pty Ltd country: AU admin-c: CCGP1-AP tech-c: CCGP1-AP mnt-lower: MAINT-CCG-AU mnt-routes: MAINT-CCG-AU mnt-irt: IRT-CCG-AU mnt-by: APNIC-HM status: ALLOCATED PORTABLE remarks: -+-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+-+-+-+-+-+-+-+-+-+ remarks: This object can only be updated by APNIC hostmasters. remarks: To update this object, please contact APNIC remarks: hostmasters and include your organization's account remarks: name in the subject line. remarks: -+-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+-+-+-+-+-+-+-+-+-+ last-modified: 2014-06-19T06:22:02Z source: APNIC
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.