170.249.112.0/20

inetnum:        170.249.96.0 - 170.249.127.255
netname:        JCV
descr:          Joetsu Cable Vision Co.,Ltd.
descr:          2-2-27,Nishishiro-chou,Joetsu,Niigata 943-8522,Japan
admin-c:        JNIC1-AP
tech-c:         JNIC1-AP
remarks:        Email address for spam or abuse complaints : jcv-ix-isp@jcv.co.jp
country:        JP
mnt-by:         MAINT-JPNIC
mnt-lower:      MAINT-JPNIC
mnt-routes:     MAINT-JPNIC
mnt-irt:        IRT-JPNIC-JP
status:         ALLOCATED PORTABLE
last-modified:  2018-12-12T06:11:38Z
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:        170.249.96.0 - 170.249.127.255
netname:        JCV-CIDR-BLK-JP
descr:          Joetsu Cable Vision Co.,Ltd.
remarks:        Email address for spam or abuse complaints : jcv-ix-isp@jcv.co.jp
country:        JP
admin-c:        JP00164408
tech-c:         JP00164408
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:  2018-12-18T18:23:52Z
source:         JPNIC

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.