217.151.16.0/21
AS31643 · Gorodskaya elektronnaya svyaz Ltd
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inetnum: 217.151.16.0 - 217.151.19.255 netname: RU-IMASTER descr: Gesnet broadband network descr: LLC Gorodsakaya electronnaya svyaz descr: Gercena street, 19, 502 descr: 644099, Omsk country: RU admin-c: GESL2-RIPE tech-c: GESL2-RIPE status: ASSIGNED PA mnt-by: IMASTER-MNT created: 2004-06-30T10:00:39Z last-modified: 2023-10-12T11:24:28Z source: RIPE abuse-email: noc@imaster.ru abuse-c: AG16463-RIPE abuse-org: ORG-CC3-RIPE role: Gorodskaya elektronnaya svyaz Ltd Hostmaster address: 19 Gertsena St, 502 address: 644099 address: Omsk address: RUSSIAN FEDERATION phone: +73812220202 admin-c: WHYB-RIPE tech-c: WHYB-RIPE notify: lirmnt@imaster.ru abuse-mailbox: abusenoc@imaster.ru e-mail: lirmnt@imaster.ru nic-hdl: GESL2-RIPE mnt-by: IMASTER-MNT created: 2018-04-09T05:28:35Z last-modified: 2021-05-07T06:53:31Z source: RIPE route: 217.151.16.0/21 descr: IMASTER Network origin: AS31643 mnt-by: IMASTER-MNT created: 2009-07-31T05:44:17Z last-modified: 2009-07-31T05:44:17Z 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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