2001:1b80::/32 - PL-ERANET-20040517
inet6num: 2001:1b80::/29 netname: PL-ERANET-20040517 country: PL org: ORG-EG4-RIPE admin-c: Pa5691-RIPE tech-c: Po1778-RIPE status: ALLOCATED-BY-RIR mnt-by: RIPE-NCC-HM-MNT mnt-by: AS12912-MNT mnt-lower: dgorka-tmobile-mnt mnt-lower: AS12912-MNT mnt-routes: AS12912-MNT created: 2016-04-19T08:34:57Z last-modified: 2018-08-06T14:41:16Z source: RIPE organisation: ORG-EG4-RIPE org-name: T-MOBILE POLSKA SPOLKA AKCYJNA org-type: LIR address: Marynarska 12 address: 02-674 address: Warszawa address: POLAND phone: +48224135093 fax-no: +48224136889 admin-c: PH1700-RIPE admin-c: JU276-RIPE admin-c: GB17291-RIPE mnt-ref: AS12912-MNT mnt-ref: RIPE-NCC-HM-MNT mnt-by: RIPE-NCC-HM-MNT mnt-by: AS12912-MNT abuse-c: tat26-ripe created: 2004-04-17T11:47:01Z last-modified: 2018-08-06T14:41:18Z source: RIPE e-mail: firstname.lastname@example.org role: PTC admins address: T-Mobile Polska S.A. address: Marynarska 12 address: 02-674, Warszawa address: POLAND e-mail: email@example.com admin-c: GB17291-RIPE admin-c: ST1900-RIPE abuse-mailbox: firstname.lastname@example.org mnt-by: AS12912-MNT tech-c: GB17291-RIPE nic-hdl: Pa5691-RIPE created: 2011-01-14T07:15:13Z last-modified: 2015-01-27T12:46:41Z source: RIPE role: PTC operations address: T-Mobile Polska S.A. address: Marynarska 12 address: 02-674, Warszawa address: POLAND mnt-by: AS12912-MNT abuse-mailbox: email@example.com e-mail: firstname.lastname@example.org admin-c: GB17291-RIPE tech-c: PH1700-RIPE nic-hdl: Po1778-RIPE created: 2011-01-14T07:18:23Z last-modified: 2015-01-27T12:49:25Z 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.