Provider B.V. IPv6 block B BIT
AS12859 BIT BV
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inet6num: 2a03,3060,b,,/48 netname: PROVIDER-NL-IPV6-BIT descr: Provider B.V. IPv6 block B BIT country: EU admin-c: JB7577-RIPE tech-c: JB7577-RIPE status: AGGREGATED-BY-LIR assignment-size: 64 mnt-by: NLPROVIDER-MNT mnt-routes: BIT-MNT created: 2015-07-29T06,02,16Z last-modified: 2015-07-29T06,02,16Z source: RIPE person: Jeroen Boonstra address: Oranjesingel 76 6511 NZ Nijmegen The Netherlands phone: +3124350 59 15 nic-hdl: JB7577-RIPE created: 2010-06-23T10,04,10Z last-modified: 2012-12-28T08,51,14Z source: RIPE mnt-by: NLPROVIDER-MNT2 abuse-mailbox: email@example.com route6: 2a03,3060,b,,/48 descr: Provider BV origin: AS12859 mnt-by: BIT-MNT notify: firstname.lastname@example.org created: 2015-07-29T07,23,39Z last-modified: 2015-07-29T07,23,39Z 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.