210.172.248.0/21

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:        210.172.252.0 - 210.172.255.255
netname:        JCOM-NET
descr:          Jupiter Telecommunications Co., Ltd.
country:        JP
admin-c:        JP00006551
tech-c:         JP00006551
last-modified:  2015-12-26T01:44:06Z
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 210.172.248.0/21

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
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

No IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

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
48.199.89.245	AS8075 Microsoft Corporation	`1.90ms` from Amsterdam, NL
161.8.136.181	AS6079 RCN	`1.93ms` from Ashburn, US
181.49.14.117	AS14080 Telmex Colombia S.A.	`1.05ms` from Bogota, CO
73.38.132.133	AS7922 Comcast Cable Communications, LLC	`9.90ms` from Boston, US
179.41.9.117	AS22927 Telefonica de Argentina	`1.54ms` from Buenos Aires, AR
104.245.55.197	AS63251 Metro Wireless International, Inc.	`1.33ms` from Detroit, US
93.207.54.197	AS3320 Deutsche Telekom AG	`6.36ms` from Hamburg, DE
31.150.222.133	AS9145 EWE TEL GmbH	`5.10ms` from Hamburg, DE
218.255.180.213	AS9381 HKBN Enterprise Solutions HK Limited	`0.68ms` from Hong Kong, HK
115.160.138.133	AS9381 HKBN Enterprise Solutions HK Limited	`0.67ms` from Hong Kong, HK
88.202.147.149	AS56329 Gigaclear Limited	`1.45ms` from London, GB
178.239.209.5	AS51681 SINEASEN S.L.	`7.87ms` from Madrid, ES
122.168.197.229	AS24560 Bharti Airtel Ltd., Telemedia Services	`15.02ms` from Mumbai, IN
119.240.248.229	AS2518 BIGLOBE Inc.	`12.16ms` from Osaka, JP
189.108.114.165	AS10429 TELEFÔNICA BRASIL S.A	`0.99ms` from Osasco, BR
1.159.170.101	AS1221 Telstra Limited	`3.43ms` from Perth, AU
158.95.58.165	AS55256 Netskope Inc	`0.15ms` from Perth, AU
192.175.26.133	AS11404 Wave Broadband	`0.45ms` from San Jose, US
208.76.232.5	AS40499 Washington Gas	`1.14ms` from Seattle, US
125.145.220.21	AS4766 Korea Telecom	`4.16ms` from Seoul, KR
72.83.203.53	AS701 Verizon Business	`1.61ms` from Ashburn, US
79.223.64.85	AS3320 Deutsche Telekom AG	`7.12ms` from Frankfurt am Main, DE
182.254.162.133	AS45090 Shenzhen Tencent Computer Systems Company Limited	`2.01ms` from Guangzhou, CN
171.231.188.181	AS7552 Viettel Group	`9.02ms` from Ho Chi Minh City, VN
132.239.216.149	AS7377 University of California, San Diego	`2.69ms` 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 -f5 -m9 210.172.255.179

traceroute to 210.172.255.179 (210.172.255.179): 9 hops max, 52 byte packets

5 [AS5580] 203.190.230.37 1.227 ms

6 [AS9824] 203.165.0.57 1.148 ms

7 *

8 *

9 *

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.

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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