inet6num: 2a01,540,,/32 netname: RU-RTK-20071023 country: RU org: ORG-JR8-RIPE admin-c: UMAS1-RIPE tech-c: UMAS1-RIPE status: ALLOCATED-BY-RIR notify: firstname.lastname@example.org mnt-by: RIPE-NCC-HM-MNT mnt-by: ROSTELECOM-MNT mnt-lower: MFIST-MNT mnt-lower: ROSTELECOM-MNT mnt-routes: MFIST-MNT created: 2007-10-23T13,38,01Z last-modified: 2016-09-15T16,23,03Z source: RIPE organisation: ORG-JR8-RIPE org-name: PJSC Rostelecom org-type: LIR address: 25-2, Dubovaya Roscha street address: 127427 address: MOSCOW address: RUSSIAN FEDERATION phone: +7 495 339 11 22 fax-no: +74999953619 e-mail: email@example.com admin-c: ES1680-RIPE admin-c: DS4715-RIPE admin-c: EP6706-RIPE admin-c: AA728-RIPE admin-c: SVS153-RIPE admin-c: AVO12-RIPE admin-c: RVP-RIPE admin-c: TR4627-RIPE admin-c: TL4565-RIPE admin-c: AAA42-RIPE admin-c: DN216-RIPE admin-c: DA2353-RIPE admin-c: ANK2555-RIPE admin-c: IS111-RIPE admin-c: VE128-RIPE admin-c: SS216-RIPE abuse-c: RTNC-RIPE mnt-ref: RIPE-NCC-HM-MNT mnt-ref: ROSTELECOM-MNT abuse-mailbox: firstname.lastname@example.org mnt-by: RIPE-NCC-HM-MNT mnt-by: ROSTELECOM-MNT created: 2005-03-22T11,11,20Z last-modified: 2016-11-07T12,50,07Z source: RIPE role: Rostelecom Ural Administration Staff address: 11, Moskovskaya str. address: Yekaterinburg, 620014 address: Russian Federation phone: +7 902 409-60-98 e-mail: email@example.com e-mail: firstname.lastname@example.org admin-c: AV8646-RIPE tech-c: SK3575-RIPE nic-hdl: UMAS1-RIPE mnt-by: MFIST-MNT created: 2007-08-06T11,32,13Z last-modified: 2016-04-01T06,34,53Z 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.