inet6num: 2001,67c,2b24,,/48 netname: SE-TULLVERKET country: SE org: ORG-TA763-RIPE sponsoring-org: ORG-TA45-RIPE admin-c: LA1832-RIPE tech-c: LA1832-RIPE status: ASSIGNED PI mnt-by: RIPE-NCC-END-MNT mnt-by: lastrom-mnt mnt-routes: TELIANET-RR mnt-routes: AS1257-MNT mnt-domains: TELIANET-LIR created: 2013-08-23T13,19,30Z last-modified: 2016-04-14T09,54,19Z source: RIPE organisation: ORG-TA763-RIPE org-name: Tullverket org-type: OTHER descr: Tullen address: Box 12854 address: 112 98 Stockholm address: SE phone: +46920259648 e-mail: firstname.lastname@example.org admin-c: LA1832-RIPE tech-c: LA1832-RIPE abuse-c: AR20357-RIPE abuse-mailbox: email@example.com ref-nfy: firstname.lastname@example.org notify: email@example.com mnt-by: TELIANET-LIR mnt-ref: TELIANET-LIR created: 2013-08-13T11,17,08Z last-modified: 2014-04-04T11,26,57Z source: RIPE person: Lars Astrom address: Aurorum 3 977 75 Lule SE e-mail: firstname.lastname@example.org phone: +46920259648 nic-hdl: LA1832-RIPE created: 2006-03-14T12,55,11Z last-modified: 2016-04-07T07,36,58Z mnt-by: RIPE-NCC-LOCKED-MNT 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.