210.172.240.0/21

AS4721 · JCOM Co., Ltd.

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Summary

Country	Japan
Domain	jcom.co.jp
ASN	AS4721
Parent Range	210.172.240.0/20
Registry	JPNIC
ID	JCOM-NET

WHOIS Details

inetnum:        210.172.240.0 - 210.172.247.255
netname:        JCOM-NET
descr:          Jupiter Telecommunications Co., Ltd.
country:        JP
admin-c:        JP00006551
tech-c:         JP00006551
last-modified:  2015-11-25T04:50:10Z
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 contain 210.172.240.0/21

Range	ASN	Company	Num of IPs
210.172.240.0/20	AS4721	JCOM Co., Ltd.	4,096

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
210.172.240.0/20	AS4721	JCOM Co., Ltd.	4,096

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

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

IP Address	ASN	Details
210.172.240.1	AS4721 JCOM Co., Ltd.	`4.10ms` 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
210.172.245.85	AS4721 JCOM Co., Ltd.	`12.90ms` from Tokyo, JP
210.172.241.62	AS4721 JCOM Co., Ltd.	`11.24ms` from Tokyo, JP
210.172.243.56	AS4721 JCOM Co., Ltd.	`9.69ms` from Tokyo, JP
210.172.242.106	AS4721 JCOM Co., Ltd.	`9.79ms` 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
185.177.94.117	AS39572 DataWeb Global Group B.V.	`0.31ms` from Amsterdam, NL
13.81.221.213	AS8075 Microsoft Corporation	`0.29ms` from Amsterdam, NL
50.31.182.5	AS23352 DEFT.COM	`0.23ms` from Chicago, US
63.131.192.37	AS26133 Frankfort Plant Board	`15.18ms` from Chicago, US
73.67.5.53	AS7922 Comcast Cable Communications, LLC	`13.46ms` from Chicago, US
51.112.42.213	AS16509 Amazon.com, Inc.	`0.09ms` from Dubai, AE
122.173.3.165	AS24560 Bharti Airtel Ltd., Telemedia Services	`1.75ms` from Hyderabad, IN
221.2.207.213	AS4837 CHINA UNICOM China169 Backbone	`4.18ms` from Jinan, CN
193.24.13.133	AS21267 Wavenet Limited	`0.40ms` from London, GB
60.170.97.101	AS4134 CHINANET-BACKBONE	`9.85ms` from Nanchang, CN
112.184.164.213	AS4766 Korea Telecom	`2.48ms` from Seoul, KR
189.126.147.21	AS270631 Totvs S.A.	`0.50ms` from Warsaw, PL
94.168.119.197	AS33915 Vodafone Libertel B.V.	`3.15ms` from Amsterdam, NL
107.13.136.117	AS11426 Charter Communications Inc	`8.49ms` from Ashburn, US
35.85.101.37	AS16509 Amazon.com, Inc.	`0.17ms` from Boardman, US
122.99.119.133	AS9268 Over The Wire Pty Ltd	`0.18ms` from Brisbane, AU
76.180.55.37	AS11351 Charter Communications Inc	`18.00ms` from Chicago, US
93.131.88.181	AS6805 Telefonica Germany GmbH & Co.OHG	`2.74ms` from Duesseldorf, DE
213.208.197.85	AS8220 COLT Technology Services Group Limited	`0.61ms` from Frankfurt am Main, DE
47.243.213.85	AS45102 Alibaba (US) Technology Co., Ltd.	`0.64ms` from Hong Kong, HK
149.137.255.117	AS12213 Centersquare	`1.41ms` from Los Angeles, US
104.250.174.5	AS9009 M247 Europe SRL	`0.27ms` from Los Angeles, US
24.122.236.21	AS11290 Cogeco Connexion inc	`2.51ms` from Montreal, CA
207.99.106.101	AS8001 Cologix, Inc	`0.82ms` from New York City, US
111.168.109.85	AS2518 BIGLOBE Inc.	`13.19ms` from Osaka, JP

Traceroute

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

traceroute -a -n -q1 210.172.242.16

traceroute to 210.172.242.16 (210.172.242.16): 64 hops max, 52 byte packets

1 [AS31898] 140.91.206.174 0.194 ms

2 [AS5580] 203.190.230.187 4.634 ms

3 [AS5580] 203.190.230.37 1.418 ms

4 [AS9824] 203.165.0.57 1.52 ms

5 *

6 *

7 *

8 [AS4721] 210.172.242.16 20.025 ms

Measurement taken from

IPinfo ProbeNet in Tokyo, JP

On December 28th 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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