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

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

IP Address	ASN	Details
210.172.255.59	AS4721 JCOM Co., Ltd.	`11.95ms` from Tokyo, JP
210.172.254.137	AS4721 JCOM Co., Ltd.	`7.91ms` from Tokyo, JP
210.172.252.1	AS4721 JCOM Co., Ltd.	`2.47ms` from Tokyo, JP
210.172.253.29	AS4721 JCOM Co., Ltd.	`7.53ms` 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
108.170.236.197	AS15169 Google LLC	`0.25ms` from Al Fujairah City, AE
36.110.243.117	AS23724 IDC, China Telecommunications Corporation	`2.42ms` from Beijing, CN
73.219.124.165	AS7922 Comcast Cable Communications, LLC	`8.24ms` from Boston, US
72.3.136.85	AS33070 Rackspace Hosting	`1.03ms` from Dallas, US
129.212.142.213	AS14061 DigitalOcean, LLC	`0.12ms` from Frankfurt am Main, DE
23.91.5.37	AS16509 Amazon.com, Inc.	`0.43ms` from Helsinki, FI
212.156.68.245	AS9121 Turk Telekomunikasyon Anonim Sirketi	`1.02ms` from Istanbul, TR
203.119.29.5	AS24409 China Internet Network Infomation Center	`0.65ms` from Lhasa, CN
208.79.89.5	AS25795 ARP NETWORKS, INC.	`0.32ms` from Los Angeles, US
75.72.44.5	AS7922 Comcast Cable Communications, LLC	`3.25ms` from Minneapolis, US
81.198.79.213	AS12578 SIA Tet	`0.53ms` from Riga, LV
162.240.208.181	AS46606 Unified Layer	`1.97ms` from Salt Lake City, US
67.226.181.117	AS20161 TeraGo Networks Inc.	`0.81ms` from Toronto, CA
213.10.151.37	AS1136 KPN B.V.	`3.08ms` from Amsterdam, NL
81.207.197.181	AS1136 KPN B.V.	`2.45ms` from Amsterdam, NL
20.126.35.245	AS8075 Microsoft Corporation	`0.27ms` from Amsterdam, NL
73.238.104.101	AS7922 Comcast Cable Communications, LLC	`6.18ms` from Boston, US
91.182.143.245	AS5432 Proximus NV	`1.19ms` from Brussels, BE
170.253.209.229	AS46687 BCI Mississippi Broadband,LLC	`14.68ms` from Chicago, US
75.166.42.133	AS209 CenturyLink Communications, LLC	`2.09ms` from Denver, US
3.121.76.101	AS16509 Amazon.com, Inc.	`0.14ms` from Frankfurt am Main, DE
194.136.149.117	AS719 Elisa Oyj	`0.81ms` from Helsinki, FI
89.26.253.133	AS5626 ONITELECOM - INFOCOMUNICACOES, S.A.	`0.34ms` from Lisbon, PT
189.226.23.213	AS8151 UNINET	`1.13ms` from Mexico City, MX
79.56.42.229	AS3269 Telecom Italia S.p.A.	`5.45ms` 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 -f3 -m8 210.172.249.11

traceroute to 210.172.249.11 (210.172.249.11): 8 hops max, 52 byte packets

3 [AS3212] 213.161.1.149 8.71 ms

4 *

5 [AS3212] 185.66.148.205 17.997 ms

6 *

7 *

8 *

Measurement taken from

IPinfo ProbeNet in Novi Travnik, BA

On January 9th 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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