Reseaux IP Europeens Network Coordination Centre (RIPE NCC)
AS12654 Reseaux IP Europeens Network Coordination Centre (RIPE NCC)
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inet6num: 2001,7fb,,/32 netname: RIPE-NCC-RIS-20070605 org: ORG-RIEN1-RIPE remarks: RIPE NCC RIS Project - BGP studies country: EU admin-c: RISM-RIPE tech-c: RISM-RIPE status: ASSIGNED PI mnt-by: RIPE-NCC-END-MNT mnt-by: RIPE-NCC-RIS-MNT mnt-by: RIPE-NCC-MNT created: 2011-03-17T13,26,18Z last-modified: 2016-08-16T13,29,06Z source: RIPE organisation: ORG-RIEN1-RIPE org-name: Reseaux IP Europeens Network Coordination Centre (RIPE NCC) org-type: LIR descr: RIPE NCC Operations address: P.O. Box 10096 address: 1016 EB address: Amsterdam address: NETHERLANDS phone: +31205354444 fax-no: +31205354445 e-mail: firstname.lastname@example.org admin-c: MENN1-RIPE admin-c: AP110-RIPE abuse-c: ops4-ripe mnt-ref: RIPE-NCC-HM-MNT mnt-ref: RIPE-NCC-MNT mnt-by: RIPE-NCC-HM-MNT mnt-by: RIPE-NCC-MNT created: 2012-03-09T13,21,52Z last-modified: 2016-05-20T10,49,27Z source: RIPE role: RIPE NCC RIS Operations address: Singel 258 address: 1016 AB Amsterdam address: The Netherlands phone: +31 20 535 4444 fax-no: +31 20 535 4445 e-mail: email@example.com admin-c: GII-RIPE tech-c: GII-RIPE nic-hdl: RISM-RIPE mnt-by: RIPE-NCC-RIS-MNT created: 2002-09-27T09,14,06Z last-modified: 2014-07-11T14,27,50Z 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.