2a00:8861:7fff::/48 - US-PNAP-20130516
inet6num: 2a00:8860::/29 netname: US-PNAP-20130516 country: US org: ORG-PNL7-RIPE admin-c: DF5134-RIPE tech-c: AM23098-RIPE status: ALLOCATED-BY-RIR notify: email@example.com mnt-by: RIPE-NCC-HM-MNT mnt-by: PHOENIXNAP-EU-MNT mnt-lower: PHOENIXNAP-EU-MNT mnt-routes: PHOENIXNAP-EU-MNT created: 2016-01-21T10:22:52Z last-modified: 2018-06-27T12:55:18Z source: RIPE organisation: ORG-PNL7-RIPE org-name: PHOENIX NAP, LLC. org-type: LIR address: 2353, West University Drive address: 85281 address: Tempe address: UNITED STATES phone: +14804497750 fax-no: +14804498801 e-mail: MarcusB@cwie.net admin-c: DF5134-RIPE admin-c: AM23098-RIPE abuse-c: PAD45-RIPE mnt-ref: RIPE-NCC-HM-MNT mnt-ref: PHOENIXNAP-EU-MNT mnt-by: RIPE-NCC-HM-MNT mnt-by: PHOENIXNAP-EU-MNT created: 2012-02-10T13:18:32Z last-modified: 2017-10-30T14:45:07Z source: RIPE person: Adrian Montebello address: PHOENIXNAP, LLC. address: 3402, East University Drive address: Phoenix 85034 Arizona address: US e-mail: firstname.lastname@example.org phone: +14804497750 nic-hdl: AM23098-RIPE mnt-by: PHOENIXNAP-EU-MNT created: 2012-02-22T17:06:18Z last-modified: 2014-08-25T10:48:05Z source: RIPE person: Danny Fuentes address: PHOENIXNAP, LLC. address: 3402, East University Drive address: Phoenix 85034 address: US phone: +1480 449 7750 nic-hdl: DF5134-RIPE mnt-by: PHOENIXNAP-EU-MNT created: 2012-11-29T14:37:08Z last-modified: 2012-11-29T14:37:08Z 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.