inet6num: 2a02,a400,,/29 netname: KPN-ZM descr: KPN ZM descr: This allocation is used for /48 subnets country: NL admin-c: KZI-RIPE tech-c: KZI-RIPE notify: firstname.lastname@example.org status: AGGREGATED-BY-LIR assignment-size: 48 mnt-by: AS286-MNT created: 2012-06-05T13,50,09Z last-modified: 2012-06-05T13,50,09Z source: RIPE role: KPN Zakelijk Internet address: NL phone: +310704513500 admin-c: KPN-RIPE tech-c: KPN-RIPE e-mail: email@example.com remarks: =============================================== remarks: For portscans, DoS attacks and spam complaints, remarks: please use the email address "firstname.lastname@example.org". remarks: =============================================== notify: email@example.com nic-hdl: KZI-RIPE mnt-by: AS286-MNT created: 2007-09-21T07,53,51Z last-modified: 2015-05-18T08,41,06Z source: RIPE route6: 2a02,a400,,/26 descr: KPN B.V. origin: AS1136 notify: firstname.lastname@example.org mnt-by: KPN-MNT mnt-routes: KPN-MNT created: 2015-09-01T11,49,14Z last-modified: 2015-09-01T11,49,14Z source: RIPE
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.