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

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

IP Address	ASN	Details
210.172.241.35	AS4721 JCOM Co., Ltd.	`12.48ms` from Tokyo, JP
210.172.245.145	AS4721 JCOM Co., Ltd.	`10.82ms` from Tokyo, JP
210.172.242.25	AS4721 JCOM Co., Ltd.	`7.78ms` from Tokyo, JP
210.172.240.1	AS4721 JCOM Co., Ltd.	`4.03ms` from Tokyo, JP
210.172.244.1	AS4721 JCOM Co., Ltd.	`4.01ms` from Tokyo, JP
210.172.246.220	AS4721 JCOM Co., Ltd.	`13.57ms` from Tokyo, JP
210.172.247.175	AS4721 JCOM Co., Ltd.	`11.74ms` from Tokyo, JP
210.172.243.7	AS4721 JCOM Co., Ltd.	`13.08ms` 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
94.65.237.197	AS6799 Ote SA (Hellenic Telecommunications Organisation)	`1.32ms` from Athens, GR
97.212.99.85	AS6167 Verizon Business	`15.45ms` from Atlanta, US
185.242.56.5	AS31117 ENERGOTEL a.s.	`4.50ms` from Bratislava, SK
139.130.24.165	AS1221 Telstra Limited	`5.25ms` from Brisbane, AU
98.129.225.101	AS33070 Rackspace Hosting	`1.02ms` from Dallas, US
99.80.6.213	AS16509 Amazon.com, Inc.	`0.12ms` from Dublin, IE
217.226.125.5	AS3320 Deutsche Telekom AG	`7.74ms` from Duesseldorf, DE
134.96.80.133	AS680 Verein zur Foerderung eines Deutschen Forschungsnetzes e.V.	`5.86ms` from Frankfurt am Main, DE
102.164.58.229	AS140595 YunJie Communication HK Company Limited	`4.52ms` from Hong Kong, HK
83.137.6.117	AS31404 LYCATEL DISTRIBUTION UK LIMITED	`0.81ms` from London, GB
2.98.8.5	AS13285 TalkTalk Communications Limited	`1.22ms` from Manchester, GB
200.71.127.245	AS263821 Soluciones Favorables	`1.24ms` from New York City, US
90.183.103.117	AS5610 O2 Czech Republic, a.s.	`0.89ms` from Prague, CZ
58.59.93.53	AS4134 CHINANET-BACKBONE	`5.26ms` from Qingdao, CN
79.23.123.133	AS3269 Telecom Italia S.p.A.	`9.89ms` from Rende, IT
79.12.127.5	AS3269 Telecom Italia S.p.A.	`13.86ms` from Rome, IT
24.113.235.101	AS11404 Wave Broadband	`4.03ms` from Seattle, US
182.230.243.213	AS17858 LG POWERCOMM	`1.95ms` from Seoul, KR
112.212.106.53	AS38096 SK Broadband Co Ltd	`8.10ms` from Seoul, KR
118.241.169.85	AS2527 Sony Network Communications Inc.	`1.70ms` from Tokyo, JP
154.254.45.85	AS36947 Telecom Algeria	`13.08ms` from Algiers, DZ
200.45.221.117	AS7303 Telecom Argentina S.A.	`16.64ms` from Asuncion, PY
121.28.81.133	AS4837 CHINA UNICOM China169 Backbone	`6.67ms` from Beijing, CN
167.71.237.213	AS14061 DigitalOcean, LLC	`0.27ms` from Bengaluru, IN
181.59.219.229	AS10620 Telmex Colombia S.A.	`11.58ms` from Bogotá, CO

Traceroute

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

traceroute -a -n -q1 210.172.242.114

traceroute to 210.172.242.114 (210.172.242.114): 64 hops max, 52 byte packets

1 [AS15169] 142.251.60.112 1.778 ms

2 *

3 [AS9824] 220.152.46.109 2.072 ms

4 *

5 *

6 *

7 [AS4721] 210.172.242.114 15.652 ms

Measurement taken from

IPinfo ProbeNet in Tokyo, JP

On December 14th 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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