103.121.45.0/24
AS131941 · Entsu Co.,Ltd.
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inetnum: 103.121.44.0 - 103.121.47.255 netname: ENTSU descr: Entsu Co.,Ltd. descr: Urban-net Nihonbashi-2 Bldg.,10F,2-1-3,Nihonbashi,Chuo-ku,Tokyo 103-0027,Japan admin-c: JNIC1-AP tech-c: JNIC1-AP remarks: Email address for spam or abuse complaints : jpnic@entsu.com country: JP mnt-by: MAINT-JPNIC mnt-lower: MAINT-JPNIC mnt-routes: MAINT-JPNIC mnt-irt: IRT-JPNIC-JP status: ALLOCATED PORTABLE last-modified: 2018-08-15T05:16:56Z source: APNIC irt: IRT-JPNIC-JP address: Urbannet-Kanda Bldg 4F, 3-6-2 Uchi-Kanda address: Chiyoda-ku, Tokyo 101-0047, Japan e-mail: hostmaster@nic.ad.jp abuse-mailbox: hostmaster@nic.ad.jp admin-c: JNIC1-AP tech-c: JNIC1-AP auth: # Filtered mnt-by: MAINT-JPNIC last-modified: 2017-10-18T10:21:54Z source: APNIC role: Japan Network Information Center address: Urbannet-Kanda Bldg 4F address: 3-6-2 Uchi-Kanda address: Chiyoda-ku, Tokyo 101-0047,Japan country: JP phone: +81-3-5297-2311 fax-no: +81-3-5297-2312 e-mail: hostmaster@nic.ad.jp admin-c: JI13-AP tech-c: JE53-AP nic-hdl: JNIC1-AP mnt-by: MAINT-JPNIC last-modified: 2012-08-28T07:58:02Z source: APNIC inetnum: 103.121.44.0 - 103.121.47.255 netname: ENTSU-CIDR-BLK-JP descr: Entsu Co.,Ltd. remarks: Email address for spam or abuse complaints : jpnic@entsu.com country: JP admin-c: GS5938JP tech-c: GS5938JP remarks: This information has been partially mirrored by APNIC from remarks: JPNIC. To obtain more specific information, please use the remarks: JPNIC WHOIS Gateway at remarks: http://www.nic.ad.jp/en/db/whois/en-gateway.html or remarks: whois.nic.ad.jp for WHOIS client. (The WHOIS client remarks: defaults to Japanese output, use the /e switch for English remarks: output) last-modified: 2018-08-22T00:46:32Z source: JPNIC
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What are IP address ranges?
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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