84.244.40.0/21
AS51645 · JSC "ER-Telecom Holding"
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inetnum: 84.244.40.0 - 84.244.47.255 netname: IRKNET-NET-4 descr: irknet.ru country: RU admin-c: DSI tech-c: DSI tech-c: ITC4-RIPE status: ASSIGNED PA mnt-by: AS8345-MNT created: 2011-02-02T09:43:01Z last-modified: 2011-02-02T09:43:01Z source: RIPE abuse-email: abuse@dsi.ru abuse-c: DSI abuse-org: ORG-IBN1-RIPE role: DSI Tech Contacts address: Irkutsk, P.O.Box 267, 664033, Russia fax-no: +7 395 255 0507 phone: +7 395 255 0506 e-mail: abuse@dsi.ru admin-c: GVS1-RIPE tech-c: GVS1-RIPE tech-c: DEVS-RIPE abuse-mailbox: abuse@dsi.ru nic-hdl: DSI mnt-by: AS8345-MNT created: 2006-10-19T07:17:42Z last-modified: 2017-03-04T12:40:39Z source: RIPE role: Irknet Tech Contacts address: Dzerjinskiy str., 29, Irkutsk, 664026, Russia e-mail: admin@irknet.ru admin-c: BLIB-RIPE tech-c: DEVS-RIPE nic-hdl: ITC4-RIPE created: 2009-08-31T02:51:03Z last-modified: 2009-09-07T01:45:00Z source: RIPE mnt-by: AS8345-MNT route: 84.244.40.0/21 descr: IRKNET2ERTH origin: AS51645 mnt-by: AS8345-MNT created: 2017-08-11T03:54:43Z last-modified: 2017-08-11T03:54:43Z 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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