2401:bd00:b002::/48

inet6num:       2401:BD00::/32
netname:        DENA-NET-JPNIC-JP-20110817
descr:          Japan Network Information Center
country:        JP
admin-c:        JNIC1-AP
tech-c:         JNIC1-AP
remarks:        JPNIC Allocation Block
remarks:        Authoritative information regarding assignments and
remarks:        allocations made from within this block can also be
remarks:        queried at whois.nic.ad.jp. To obtain an English
remarks:        output query whois -h whois.nic.ad.jp x.x.x.x/e
remarks:        ************************************
remarks:        For abuse/any contacts regarding this address range,
remarks:        please refer to the contacts listed on the inet6num
remarks:        object displayed down below, or look up JPNIC Whois.
remarks:        *************************************
mnt-by:         MAINT-JPNIC
mnt-lower:      MAINT-JPNIC
mnt-irt:        IRT-JPNIC-JP
changed:        hm-changed@apnic.net 20110818
changed:        ip-apnic@nic.ad.jp 20110818
status:         ALLOCATED PORTABLE
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
changed:        abuse@apnic.net 20101108
changed:        hm-changed@apnic.net 20101111
changed:        ip-apnic@nic.ad.jp 20140702
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
changed:        hm-changed@apnic.net 20041222
changed:        hm-changed@apnic.net 20050324
changed:        ip-apnic@nic.ad.jp 20051027
changed:        ip-apnic@nic.ad.jp 20120828
source:         APNIC

inet6num:       2401:bd00::/32
netname:        DENA-NET-CIDR-BLK-JP
descr:          DeNA, Co. Ltd.
remarks:        Email address for spam or abuse complaints : abuse@dena.jp
country:        JP
admin-c:        YS5455JP
tech-c:         NT5258JP
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)
changed:        apnic-ftp@nic.ad.jp 20110818
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.