103.121.45.0/24

AS131941 · Entsu Co.,Ltd.

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Summary

Country	Japan
Domain	entsu.com
ASN	AS131941
Registry	APNIC
ID	ENTSU

WHOIS Details

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

Hosted domains

There are no domains currently hosted on this ASN.

Hosted domains API

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Useful for Cybersecurity

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Pingable IPs

19 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address	ASN	Details
103.121.45.162	AS131941 Entsu Co.,Ltd.	`0.59ms` from Tokyo, JP

Other Pingable IPs

Below is a random selection of 25 IPs that replied to an ICMP ping during our most recent internet scan.

IP Address	ASN	Details
51.19.161.232	AS5607 Sky UK Limited	`7.15ms` from London, GB
108.53.7.120	AS701 Verizon Business	`2.85ms` from New York City, US
112.175.147.24	AS4766 Korea Telecom	`0.93ms` from Seoul, KR
119.198.155.136	AS4766 Korea Telecom	`6.43ms` from Seoul, KR
222.68.219.184	AS4812 China Telecom (Group)	`3.11ms` from Shanghai, CN
18.143.207.120	AS16509 Amazon.com, Inc.	`0.11ms` from Singapore, SG
1.140.126.136	AS1221 Telstra Limited	`2.00ms` from Sydney, AU
31.184.87.56	AS50266 Odido Netherlands B.V.	`5.06ms` from Amsterdam, NL
190.158.112.248	AS14080 Telmex Colombia S.A.	`0.78ms` from Bogota, CO
52.30.247.104	AS16509 Amazon.com, Inc.	`0.13ms` from Dublin, IE
84.178.168.88	AS3320 Deutsche Telekom AG	`10.17ms` from Frankfurt am Main, DE
54.230.45.184	AS16509 Amazon.com, Inc.	`0.48ms` from Hyderabad, IN
197.159.50.72	AS37413 Hymax Talking Solutions	`0.51ms` from Johannesburg, ZA
88.9.116.120	AS3352 TELEFONICA DE ESPANA S.A.U.	`9.16ms` from Madrid, ES
71.227.139.56	AS7922 Comcast Cable Communications, LLC	`14.78ms` from Seattle, US
67.171.17.168	AS7922 Comcast Cable Communications, LLC	`6.05ms` from Seattle, US
220.118.171.104	AS4766 Korea Telecom	`0.99ms` from Seoul, KR
152.42.176.248	AS14061 DigitalOcean, LLC	`0.22ms` from Singapore, SG
134.238.39.152	AS394089 Google LLC	`0.11ms` from Sydney, AU
113.33.25.152	AS17506 ARTERIA Networks Corporation	`2.22ms` from Tokyo, JP
104.130.56.168	AS27357 Rackspace Hosting	`0.48ms` from Ashburn, US
157.166.245.40	AS5662 Turner Broadcasting System, Inc.	`1.78ms` from Atlanta, US
108.246.208.216	AS7018 AT&T Enterprises, LLC	`11.99ms` from Atlanta, US
37.131.243.232	AS15743 net.de AG	`7.97ms` from Frankfurt am Main, DE
18.168.18.104	AS16509 Amazon.com, Inc.	`0.14ms` from London, GB

Traceroute

Below is a recent traceroute taken from the IPinfo ProbeNet to an IP in this range. Learn more.

traceroute -a -n -q1 -f5 103.121.45.33

traceroute to 103.121.45.33 (103.121.45.33): 64 hops max, 52 byte packets

5 [] 210.171.225.104 0.641 ms

6 *

7 [AS131941] 103.121.45.33 0.665 ms

Measurement taken from

IPinfo ProbeNet in Tokyo, JP

On September 5th 2025

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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