2a01:4400:1::/48 - SE-ITGARDEN-IPV6
inet6num: 2a01,4400,1,,/48 netname: SE-ITGARDEN-IPV6 descr: IT Garden IPv6 Network country: SE admin-c: ANPA1-RIPE tech-c: ITGR2-RIPE status: ASSIGNED mnt-by: ITGARDEN-MNT created: 2012-02-29T16,20,42Z last-modified: 2012-02-29T16,20,42Z source: RIPE role: IT Garden Registry address: IT Garden i Landskrona AB address: Orja Skolvag 15 address: 261 91 LANDSKRONA address: Sweden phone: +46 418 44 88 40 fax-no: +46 418 769 29 e-mail: email@example.com abuse-mailbox: firstname.lastname@example.org admin-c: ANPA1-RIPE tech-c: ANPA1-RIPE admin-c: FRAN2-RIPE tech-c: FRAN2-RIPE admin-c: JEHA2-RIPE tech-c: JEHA2-RIPE admin-c: JOTI2-RIPE tech-c: JOTI2-RIPE admin-c: mist8-ripe tech-c: mist8-ripe nic-hdl: ITGR2-RIPE mnt-by: ITGARDEN-MNT created: 2011-05-11T14,12,57Z last-modified: 2013-03-07T13,48,08Z source: RIPE person: Andreas Paulsson address: IT Garden i Landskrona AB address: Orja Skolvag 15 address: 261 91 Landskrona address: Sweden phone: +46 418 769 12 fax-no: +46 418 769 29 e-mail: email@example.com nic-hdl: ANPA1-RIPE mnt-by: ITGARDEN-MNT created: 2009-07-14T12,15,49Z last-modified: 2009-08-12T06,48,00Z source: RIPE route6: 2a01,4400,,/32 descr: It Garden i Landskrona AB origin: AS1257 notify: firstname.lastname@example.org notify: email@example.com mnt-by: AS1257-MNT created: 2012-07-31T13,06,34Z last-modified: 2012-07-31T13,06,34Z 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.