inet6num: 2001,780,,/29 netname: DE-NORIS-20011203 country: DE org: ORG-nnA1-RIPE admin-c: NNN-RIPE tech-c: NNN-RIPE status: ALLOCATED-BY-RIR notify: firstname.lastname@example.org mnt-by: RIPE-NCC-HM-MNT mnt-by: NORIS-MNT mnt-lower: NORIS-MNT mnt-routes: NORIS-MNT created: 2012-08-10T08,57,54Z last-modified: 2016-05-18T14,04,41Z source: RIPE organisation: ORG-nnA1-RIPE org-name: noris network AG org-type: LIR address: Thomas-Mann-Strasse 16-20 address: 90471 address: Nuernberg address: GERMANY phone: +4970077777112 phone: +499119352112 fax-no: +499119352100 e-mail: email@example.com admin-c: GRAF2-RIPE admin-c: IK1-RIPE admin-c: GPF-RIPE admin-c: POHL-RIPE abuse-c: NNN-RIPE mnt-ref: RIPE-NCC-HM-MNT mnt-ref: NORIS-MNT notify: firstname.lastname@example.org mnt-by: RIPE-NCC-HM-MNT mnt-by: NORIS-MNT created: 2004-04-17T11,10,53Z last-modified: 2016-05-18T14,04,37Z source: RIPE role: noris network netmaster address: noris network AG address: Thomas-Mann-Strasse 16-20 address: 90471 Nuernberg address: Germany phone: +49 911 9352 0 fax-no: +49 911 9352 100 e-mail: email@example.com abuse-mailbox: firstname.lastname@example.org admin-c: IK1-RIPE tech-c: COOL-RIPE tech-c: POHL-RIPE tech-c: GPF-RIPE tech-c: GRAF2-RIPE nic-hdl: NNN-RIPE notify: email@example.com mnt-by: NORIS-MNT created: 2002-04-08T14,29,48Z last-modified: 2013-03-26T12,19,14Z 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.