2a01:4bc0:900::/48 - Inet-Fra
inet6num: 2a01,4bc0,900,,/48 netname: Inet-Fra descr: Internet Outbreak Frankfut country: DE admin-c: PW4153-RIPE admin-c: TS6650-RIPE tech-c: GK5180-RIPE tech-c: UA17368-RIPE status: ASSIGNED mnt-by: EVONIK-NOC created: 2014-09-26T10,32,13Z last-modified: 2016-11-03T15,23,27Z source: RIPE person: Gregor Kalus address: Goldschmidtstr.100 address: 45127 Essen address: Germany phone: +49 201 173 1382 e-mail: email@example.com nic-hdl: GK5180-RIPE mnt-by: EVONIK-NOC created: 2016-11-03T15,06,00Z last-modified: 2016-11-03T15,06,00Z source: RIPE person: Patrick Willger address: Paul-Baumann-Str. 1 address: 45772 Marl address: Germany phone: +492365495480 e-mail: firstname.lastname@example.org nic-hdl: PW4153-RIPE mnt-by: EVONIK-NOC created: 2016-11-03T15,03,35Z last-modified: 2016-11-03T15,09,35Z source: RIPE person: Thomas Steinhoff address: Evonik Industries AG address: Goldschmidtstrasse 100 address: D-45127 Essen address: Germany org: ORG-ESG5-RIPE phone: +49 201 173-1259 fax-no: +49 201 173-711259 nic-hdl: TS6650-RIPE mnt-by: EVONIK-NOC created: 2011-07-12T14,20,33Z last-modified: 2016-10-31T15,20,28Z source: RIPE person: Uemit Altan address: Paul-Baumann-Str.1 address: 45772 Marl address: Germany phone: +492365497134 e-mail: email@example.com nic-hdl: UA17368-RIPE mnt-by: EVONIK-NOC created: 2016-11-03T15,01,12Z last-modified: 2016-11-03T15,01,12Z source: RIPE route6: 2a01,4bc0,900,,/48 descr: Evonik Internet Frankfurt origin: AS12422 mnt-by: EVONIK-NOC created: 2014-10-22T13,41,59Z last-modified: 2014-10-22T13,41,59Z 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.