81.16.154.0/24
AS197458 · Organization of the Petroleum Exporting Countries
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inetnum: 81.16.154.0 - 81.16.154.255 netname: OFID-NET descr: The OPEC Fund for International Development descr: Parkring 8 descr: 1010 Vienna descr: Austria country: AT admin-c: FS10968-RIPE tech-c: FS10968-RIPE status: ASSIGNED PA mnt-by: AS1764-MNT created: 2013-09-17T09:26:35Z last-modified: 2013-09-17T09:26:35Z source: RIPE abuse-email: abuse@nextlayer.at abuse-c: NLTC1-RIPE abuse-org: ORG-NLTU1-RIPE person: Feras Sabha address: The OPEC Fund for International Development address: Parkring 8 address: 1010 Vienna address: Austria phone: +43-1-515 64-0 nic-hdl: FS10968-RIPE mnt-by: AS1764-MNT created: 2013-09-17T09:25:03Z last-modified: 2013-09-17T09:25:03Z source: RIPE route: 81.16.154.0/24 descr: The OPEC Fund for International Development origin: AS197458 mnt-by: AS1764-MNT created: 2013-09-17T13:53:19Z last-modified: 2013-09-17T13:53:19Z source: RIPE
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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.
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