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
210.172.246.22	AS4721 JCOM Co., Ltd.	`12.93ms` from Tokyo, JP
210.172.245.95	AS4721 JCOM Co., Ltd.	`10.80ms` from Tokyo, JP
210.172.241.35	AS4721 JCOM Co., Ltd.	`12.02ms` from Tokyo, JP
210.172.247.141	AS4721 JCOM Co., Ltd.	`12.70ms` from Tokyo, JP
210.172.244.1	AS4721 JCOM Co., Ltd.	`3.61ms` from Tokyo, JP
210.172.240.1	AS4721 JCOM Co., Ltd.	`3.70ms` from Tokyo, JP
210.172.242.106	AS4721 JCOM Co., Ltd.	`12.12ms` from Tokyo, JP
210.172.243.7	AS4721 JCOM Co., Ltd.	`12.79ms` 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
20.76.54.133	AS8075 Microsoft Corporation	`0.25ms` from Amsterdam, NL
96.81.69.197	AS7922 Comcast Cable Communications, LLC	`6.22ms` from Boston, US
1.31.235.21	AS4837 CHINA UNICOM China169 Backbone	`11.88ms` from Changchun, CN
170.178.144.21	AS18590 Chi Networks	`0.26ms` from Chicago, US
141.109.70.213	AS14593 Space Exploration Technologies Corporation	`0.12ms` from Johannesburg, ZA
38.100.200.5	AS174 Cogent Communications, LLC	`0.11ms` from Miami, US
195.120.146.197	AS3269 Telecom Italia S.p.A.	`6.56ms` from Milan, IT
192.149.72.245	AS393797 Trac Intermodal	`1.73ms` from New York City, US
130.174.69.5	AS3360 DXC US Latin America Corporation	`7.59ms` from Saint Thomas Mount, IN
68.186.33.181	AS20115 Charter Communications LLC	`8.38ms` from San Jose, US
38.12.71.197	AS54600 PEG TECH INC	`0.66ms` from San Jose, US
211.57.198.197	AS4766 Korea Telecom	`5.97ms` from Seoul, KR
165.156.18.149	AS12008 Vercara, LLC	`0.14ms` from Sydney, AU
52.187.228.181	AS8075 Microsoft Corporation	`0.68ms` from Sydney, AU
211.78.18.21	AS9919 New Century InfoComm Tech Co., Ltd.	`0.63ms` from Taipei, TW
115.146.3.149	AS9597 KDDI Web Communications Inc.	`0.53ms` from Tokyo, JP
99.229.105.5	AS812 Rogers Communications Canada Inc.	`4.77ms` from Toronto, CA
37.6.190.165	AS25472 Nova Telecommunications & Media Single Member S.A	`9.89ms` from Volos, GR
112.46.24.21	AS140105 Shaanxi Mobile Communication Company Limited	`1.17ms` from Xi'an, CN
42.227.75.69	AS4837 CHINA UNICOM China169 Backbone	`2.43ms` from Zhengzhou, CN
143.176.10.229	AS13127 Odido Netherlands B.V.	`7.67ms` from Amsterdam, NL
86.132.69.21	AS2856 British Telecommunications PLC	`4.68ms` from Erith, GB
101.71.66.245	AS4837 CHINA UNICOM China169 Backbone	`6.36ms` from Hangzhou, CN
211.178.238.101	AS9318 SK Broadband Co Ltd	`1.38ms` from Incheon, KR
74.62.241.101	AS20001 Charter Communications Inc	`0.64ms` from Los Angeles, US

Traceroute

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

traceroute -a -n -q1 210.172.245.145

traceroute to 210.172.245.145 (210.172.245.145): 64 hops max, 52 byte packets

1 [AS31898] 140.91.206.122 0.191 ms

2 [AS5580] 203.190.230.187 0.977 ms

3 [AS5580] 203.190.230.37 1.597 ms

4 [AS9824] 203.165.0.53 1.234 ms

5 *

6 *

7 *

8 [AS4721] 210.172.245.145 14.128 ms

Measurement taken from

IPinfo ProbeNet in Tokyo, JP

On January 30th 2026

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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