2001:610::/29 - NL-SURFNET-19990819
inet6num: 2001,610,,/29 netname: NL-SURFNET-19990819 country: NL org: ORG-Sb3-RIPE admin-c: SNS1-RIPE tech-c: SNS1-RIPE status: ALLOCATED-BY-RIR notify: email@example.com mnt-by: RIPE-NCC-HM-MNT mnt-by: SN-LIR-MNT mnt-lower: AS1103-MNT mnt-lower: SN-LIR-MNT mnt-routes: AS1103-MNT mnt-routes: SN-LIR-MNT created: 2016-08-25T13,01,49Z last-modified: 2017-06-13T11,26,40Z source: RIPE organisation: ORG-Sb3-RIPE org-name: SURFnet bv org-type: LIR address: P.O. Box 19035 address: 3501 DA address: Utrecht address: NETHERLANDS phone: +31302305305 fax-no: +31302305329 e-mail: firstname.lastname@example.org admin-c: HT3384-RIPE admin-c: MK512-RIPE admin-c: SNS1-RIPE admin-c: JK9622-RIPE admin-c: RVR19-RIPE admin-c: WB311-RIPE admin-c: NO17-RIPE admin-c: RS957-RIPE admin-c: SM12780-RIPE abuse-c: SNS1-RIPE mnt-ref: RIPE-NCC-HM-MNT mnt-ref: SN-LIR-MNT mnt-by: RIPE-NCC-HM-MNT mnt-by: SN-LIR-MNT created: 2004-04-17T11,43,29Z last-modified: 2017-08-24T10,54,39Z source: RIPE remarks: especially for NCC ticket 2017083952 # 2017083952 role: SURFnet Network Services address: Kantoren Hoog Overborch (Hoog Catharijne) address: Moreelsepark 48, 3511 EP Utrecht address: Postbus 19035, 3501 DA Utrecht phone: +31 88 7873000 admin-c: JK9622-RIPE tech-c: NO17-RIPE tech-c: JK9622-RIPE tech-c: MK512-RIPE nic-hdl: SNS1-RIPE abuse-mailbox: email@example.com mnt-by: AS1103-MNT created: 2002-07-09T10,06,06Z last-modified: 2015-02-05T09,00,39Z source: RIPE e-mail: firstname.lastname@example.org route6: 2001,610,,/29 descr: SURFnet IPv6 block origin: AS1103 mnt-by: AS1103-MNT created: 2016-09-07T13,54,39Z last-modified: 2016-09-08T12,00,37Z 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.