inet6num: 2001,67c,2c4c,,/48 netname: SE-MKB remarks: In case of improper use, please mail country: SE org: ORG-MFA21-RIPE sponsoring-org: ORG-TA44-RIPE admin-c: CS11811-RIPE tech-c: FS12065-RIPE status: ASSIGNED PI mnt-by: RIPE-NCC-END-MNT mnt-by: SWIPNET-LIR-MNT mnt-routes: SWIPNET-LIR-MNT mnt-domains: SWIPNET-LIR-MNT created: 2014-11-07T10,10,10Z last-modified: 2016-04-14T09,07,28Z source: RIPE organisation: ORG-MFA21-RIPE org-name: MKB Fastighets AB org-type: OTHER address: Adlerfelts väg 3 address: 213 65 Malmö address: Sweden e-mail: email@example.com abuse-c: AR27865-RIPE mnt-ref: SWIPNET-LIR-MNT mnt-by: SWIPNET-LIR-MNT created: 2014-10-21T07,09,02Z last-modified: 2014-11-17T22,33,21Z source: RIPE person: Christopher Svensson address: Consultant Networking address: Eric Perssons väg 21 address: 217 62 Malmö address: Sweden e-mail: firstname.lastname@example.org phone: +46108787417 nic-hdl: CS11811-RIPE mnt-by: SWIPNET-LIR-MNT created: 2014-10-16T13,55,59Z last-modified: 2014-10-16T13,55,59Z source: RIPE person: Frans Stoops address: MKB Fastighets AB address: Adlerfelts väg 3 address: 213 65 Malmö address: Sweden e-mail: email@example.com phone: +4640313526 nic-hdl: FS12065-RIPE mnt-by: SWIPNET-LIR-MNT created: 2014-10-17T05,16,40Z last-modified: 2014-10-17T05,16,40Z source: RIPE route6: 2001,67c,2c4c,,/48 descr: TELE2/ SWIPNET descr: TELE2-MKB-Fastighet In case of improper use originating from this network, please mail firstname.lastname@example.org or email@example.com origin: AS1257 notify: firstname.lastname@example.org notify: email@example.com mnt-by: AS1257-MNT created: 2014-11-19T08,35,53Z last-modified: 2014-11-26T08,15,48Z 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.