inet6num: 2001,770,,/29 netname: IE-HEANET-20011008 country: IE org: ORG-HA8-RIPE admin-c: HN678-RIPE tech-c: HN678-RIPE status: ALLOCATED-BY-RIR mnt-by: RIPE-NCC-HM-MNT mnt-by: HEANET-NOC mnt-lower: HEANET-NOC mnt-routes: HEANET-NOC mnt-irt: IRT-HEANET created: 2017-05-09T12,04,14Z last-modified: 2017-05-09T12,04,14Z source: RIPE organisation: ORG-HA8-RIPE org-name: HEAnet Limited org-type: LIR descr: National Research and Education Network address: 1st Floor, 5 Georges Dock, IFSC address: 1 address: Dublin address: IRELAND phone: +35316609040 fax-no: +35316603666 e-mail: email@example.com admin-c: BB913-RIPE admin-c: BN227-RIPE admin-c: HN678-RIPE admin-c: DOC20-RIPE admin-c: GM1673-RIPE admin-c: DW238-RIPE admin-c: OMG11-RIPE abuse-c: HN678-RIPE mnt-ref: RIPE-NCC-HM-MNT mnt-ref: HEANET-NOC mnt-by: RIPE-NCC-HM-MNT mnt-by: HEANET-NOC created: 2004-04-17T11,26,58Z last-modified: 2016-06-08T13,44,36Z source: RIPE role: HEAnet NOC address: 1st Floor address: 5 Georges Dock address: IFSC address: Dublin 1 address: Ireland phone: +353 1 6609040 e-mail: firstname.lastname@example.org abuse-mailbox: email@example.com remarks: trouble, Information http,//www.heanet.ie/ remarks: trouble, Questions and fault reports mailto,firstname.lastname@example.org org: ORG-HA8-RIPE admin-c: HL2364-RIPE tech-c: DW238-RIPE tech-c: BB913-RIPE tech-c: OMG11-RIPE tech-c: GM1673-RIPE tech-c: DC323-RIPE tech-c: BN227-RIPE nic-hdl: HN678-RIPE mnt-by: HEANET-NOC created: 1970-01-01T00,00,00Z last-modified: 2016-09-12T13,55,18Z 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.