210.172.240.0/20

AS4721 · JCOM Co., Ltd.

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Summary

Country	Japan
Domain	jcom.co.jp
ASN	AS4721
Registry	JPNIC
ID	JCN-CIDR-BLK-JP

WHOIS Details

inetnum:        210.172.240.0 - 210.172.255.255
netname:        JCN-CIDR-BLK-JP
descr:          JCOM Co., Ltd.
remarks:        Email address for spam or abuse complaints : abuse@home.ne.jp
country:        JP
admin-c:        JP00006551
tech-c:         JP00006551
last-modified:  2021-09-27T23:53:50Z
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)
source:         JPNIC

Overlapping Ranges

BGP prefixes that are contained by 210.172.240.0/20

Range	ASN	Company	Num of IPs
210.172.240.0/21	AS4721	Jupiter Telecommunications Co., Ltd.	2,048

Nearby Ranges

BGP prefixes that overlap with 210.172.0.0/16

Range	ASN	Company	Num of IPs
210.172.64.0/18	AS2516	KDDI CORPORATION	16,384
210.172.0.0/19	AS9600	Sony Biz Networks Corporation	8,192
210.172.224.0/20	AS4680	Mitsubishi Electric Digital Innovation Corporation	4,096
210.172.240.0/21	AS4721	Jupiter Telecommunications Co., Ltd.	2,048

Hosted domains

There are no domains currently hosted on this ASN.

Hosted domains API

Our Hosted Domains API, or Reverse IP API returns a full list of domains that are hosted on a single IP address.

Useful for Cybersecurity

Read more

Pingable IPs

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

IP Address	ASN	Details
210.172.241.62	AS4721 JCOM Co., Ltd.	`11.24ms` from Tokyo, JP
210.172.254.37	AS4721 JCOM Co., Ltd.	`11.68ms` from Tokyo, JP
210.172.243.56	AS4721 JCOM Co., Ltd.	`9.69ms` from Tokyo, JP
210.172.245.85	AS4721 JCOM Co., Ltd.	`12.90ms` from Tokyo, JP
210.172.255.59	AS4721 JCOM Co., Ltd.	`12.53ms` from Tokyo, JP
210.172.244.1	AS4721 JCOM Co., Ltd.	`3.70ms` from Tokyo, JP
210.172.246.22	AS4721 JCOM Co., Ltd.	`12.51ms` from Tokyo, JP
210.172.247.175	AS4721 JCOM Co., Ltd.	`12.43ms` from Tokyo, JP
210.172.242.106	AS4721 JCOM Co., Ltd.	`9.79ms` from Tokyo, JP
210.172.252.1	AS4721 JCOM Co., Ltd.	`2.60ms` from Tokyo, JP
210.172.240.1	AS4721 JCOM Co., Ltd.	`4.10ms` from Tokyo, JP
210.172.253.188	AS4721 JCOM Co., Ltd.	`11.20ms` 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
18.232.18.164	AS14618 Amazon.com, Inc.	`0.59ms` from Ashburn, US
44.200.94.244	AS14618 Amazon.com, Inc.	`0.76ms` from Ashburn, US
213.16.247.196	AS1241 Forthnet	`0.42ms` from Athens, GR
120.61.138.68	AS9829 National Internet Backbone	`11.94ms` from Bengaluru, IN
68.14.81.84	AS22773 Cox Communications Inc.	`8.33ms` from Boston, US
40.67.154.36	AS8075 Microsoft Corporation	`0.21ms` from Boydton, US
89.155.151.52	AS2860 NOS COMUNICACOES, S.A.	`8.51ms` from Braga, PT
74.131.116.116	AS10796 Charter Communications Inc	`13.57ms` from Columbus, US
79.234.248.36	AS3320 Deutsche Telekom AG	`8.62ms` from Frankfurt am Main, DE
125.107.252.148	AS4134 CHINANET-BACKBONE	`7.46ms` from Hangzhou, CN
123.28.25.36	AS45899 VNPT Corp	`2.53ms` from Ho Chi Minh City, VN
90.194.60.228	AS5607 Sky UK Limited	`1.02ms` from London, GB
73.213.129.52	AS7922 Comcast Cable Communications, LLC	`10.57ms` from Manassas, US
85.141.215.36	AS8359 MTS PJSC	`14.01ms` from Moscow, RU
185.65.94.148	AS201730 DataSpring	`0.45ms` from Prague, CZ
126.108.163.180	AS17676 SoftBank Corp.	`6.92ms` from Tokyo, JP
180.16.162.84	AS4713 NTT DOCOMO BUSINESS,Inc.	`7.01ms` from Tokyo, JP
64.137.151.100	AS21949 Beanfield Technologies Inc.	`0.43ms` from Toronto, CA
69.250.66.212	AS7922 Comcast Cable Communications, LLC	`7.34ms` from Ashburn, US
46.176.206.4	AS3329 VODAFONE-PANAFON HELLENIC TELECOMMUNICATIONS COMPANY SA	`5.32ms` from Athens, GR
73.89.193.132	AS7922 Comcast Cable Communications, LLC	`11.30ms` from Boston, US
118.113.202.244	AS4134 CHINANET-BACKBONE	`3.01ms` from Chengdu, CN
219.141.70.212	AS4134 CHINANET-BACKBONE	`3.42ms` from Guiyang, CN
24.51.52.180	AS13807 Great Plains Communications LLC	`2.81ms` from Lincoln, US
188.9.127.68	AS3269 Telecom Italia S.p.A.	`5.30ms` from Milan, IT

Traceroute

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

traceroute -a -n -q1 -f6 210.172.254.37

traceroute to 210.172.254.37 (210.172.254.37): 64 hops max, 52 byte packets

6 [AS5580] 203.190.230.37 1.196 ms

7 [AS9824] 203.165.0.53 0.889 ms

8 *

9 *

10 *

11 [AS4721] 210.172.254.37 25.423 ms

Measurement taken from

IPinfo ProbeNet in Tokyo, JP

On December 29th 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.

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