210.121.128.0/17

AS4766 · Korea Telecom

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Summary

Country	South Korea
Domain	kt.com
ASN	AS4766
Registry	KRNIC
ID	KORNET-KR

WHOIS Details

inetnum:        210.121.128.0 - 210.121.255.255
netname:        KORNET-KR
descr:          Korea Telecom
country:        KR
admin-c:        IA9-KR
tech-c:         IM9-KR
status:         ALLOCATED PORTABLE
mnt-by:         MNT-KRNIC-AP
mnt-irt:        IRT-KRNIC-KR
changed:        [email protected] 20240912
remarks:        This information has been partially mirrored by APNIC from
remarks:        KRNIC. To obtain more specific information, please use the
remarks:        KRNIC whois server at whois.kisa.or.kr.
source:         KRNIC


person:         IP Manager
address:        Gyeonggi-do Bundang-gu, Seongnam-si Buljeong-ro 90
address:        KT Head Office
country:        KR
phone:          +82-2-500-6630
e-mail:         [email protected]
nic-hdl:        IM9-KR
mnt-by:         MNT-KRNIC-AP
changed:        [email protected] 20240912
remarks:        This information has been partially mirrored by APNIC from
remarks:        KRNIC. To obtain more specific information, please use the
remarks:        KRNIC whois server at whois.kisa.or.kr.
source:         KRNIC

person:         IP Manager
address:        Gyeonggi-do Bundang-gu, Seongnam-si Buljeong-ro 90
address:        KT Head Office
country:        KR
phone:          +82-2-500-6630
e-mail:         [email protected]
nic-hdl:        IA9-KR
mnt-by:         MNT-KRNIC-AP
changed:        [email protected] 20240912
remarks:        This information has been partially mirrored by APNIC from
remarks:        KRNIC. To obtain more specific information, please use the
remarks:        KRNIC whois server at whois.kisa.or.kr.
source:         KRNIC

Nearby Ranges

BGP prefixes that overlap with 210.121.0.0/16

Range	ASN	Company	Num of IPs
210.121.0.0/17	AS45374	SEJONG NETWORKS	32,768
210.121.0.0/17	AS9848	SEJONG NETWORKS	32,768

Hosted domains

There are 225 domain names hosted across 77 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address	Domain	Domains on this IP
210.121.210.44	pentestingtotal.co.kr	112
210.121.176.12	e-plm.net	11
210.121.197.5	hwacheon.com	5
210.121.188.38	savorfamily.com	4
210.121.164.36	bim-warehouse.com	4
210.121.176.122	holo.cf	4
210.121.148.100	kcredit.or.kr	4
210.121.238.5	osang.com	3
210.121.210.28	archi-training.kr	3
210.121.151.145	jangwonyoung.net	3
210.121.204.84	dajeong-tools.com	2
210.121.168.119	rrx-is.com	2
210.121.168.245	e-ilshin.com	2
210.121.143.214	inno-heim.com	2
210.121.143.213	innohorn.com	2
210.121.204.28	dstoolpia.kr	1
210.121.164.4	amranest.net	1
210.121.151.139	cwatch.co.kr	1
210.121.177.150	gijun.net	1
210.121.171.58	shnea.kr	1

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

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Pingable IPs

9,754 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address	ASN	Details
210.121.209.36	AS152290 Jejuair	`0.81ms` from Seoul, KR
210.121.157.113	AS18176 KOOKMIN UNIVERSITY	`1.91ms` from Seoul, KR
210.121.193.130	AS4766 Korea Telecom	`1.31ms` from Seoul, KR
210.121.163.175	AS4766 Korea Telecom	`1.04ms` from Seoul, KR
210.121.200.194	AS4766 Korea Telecom	`0.90ms` from Seoul, KR
210.121.134.240	AS55627 Dongduk Womens University	`2.03ms` from Seoul, KR
210.121.133.240	AS55627 Dongduk Womens University	`2.03ms` from Seoul, KR
210.121.147.193	AS4766 Korea Telecom	`0.87ms` from Seoul, KR
210.121.178.50	AS4766 Korea Telecom	`1.07ms` from Seoul, KR
210.121.226.246	AS4766 Korea Telecom	`1.40ms` from Seoul, KR
210.121.221.44	AS38676 flexnetworks	`1.23ms` from Seoul, KR
210.121.189.189	AS4766 Korea Telecom	`1.13ms` from Seoul, KR
210.121.130.70	AS4766 Korea Telecom	`0.89ms` from Seoul, KR
210.121.238.254	AS4766 Korea Telecom	`1.26ms` from Seoul, KR
210.121.156.111	AS18176 KOOKMIN UNIVERSITY	`1.90ms` from Seoul, KR
210.121.174.245	AS4766 Korea Telecom	`1.46ms` from Seoul, KR
210.121.198.77	AS4766 Korea Telecom	`1.32ms` from Seoul, KR
210.121.243.129	AS4766 Korea Telecom	`2.62ms` from Seoul, KR
210.121.142.174	AS4766 Korea Telecom	`1.18ms` from Seoul, KR
210.121.228.129	AS4766 Korea Telecom	`2.68ms` from Seoul, KR
210.121.135.240	AS55627 Dongduk Womens University	`2.08ms` from Seoul, KR
210.121.159.114	AS18176 KOOKMIN UNIVERSITY	`1.93ms` from Seoul, KR
210.121.155.119	AS18176 KOOKMIN UNIVERSITY	`1.91ms` from Seoul, KR
210.121.129.190	AS4766 Korea Telecom	`1.28ms` from Seoul, KR
210.121.185.229	AS4766 Korea Telecom	`2.27ms` from Seoul, KR

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
31.161.89.225	AS1136 KPN B.V.	`1.01ms` from Amsterdam, NL
52.232.32.225	AS8075 Microsoft Corporation	`0.26ms` from Amsterdam, NL
128.8.39.81	AS27 University of Maryland	`2.69ms` from Ashburn, US
70.21.104.1	AS701 Verizon Business	`1.84ms` from Ashburn, US
100.6.90.145	AS701 Verizon Business	`6.66ms` from Ashburn, US
68.1.46.1	AS22773 Cox Communications Inc.	`15.07ms` from Atlanta, US
111.205.125.145	AS4808 China Unicom Beijing Province Network	`3.93ms` from Beijing, CN
110.250.40.1	AS4837 CHINA UNICOM China169 Backbone	`13.78ms` from Beijing, CN
194.79.42.1	AS35796 Narodna Banka Srbije	`1.74ms` from Belgrade, RS
185.38.49.129	AS62365 SachsenGigaBit GmbH	`3.92ms` from Berlin, DE
149.233.50.129	AS8881 1&1 Versatel GmbH	`1.22ms` from Berlin, DE
44.239.28.225	AS16509 Amazon.com, Inc.	`0.16ms` from Boardman, US
188.81.246.1	AS3243 MEO - SERVICOS DE COMUNICACOES E MULTIMEDIA S.A.	`1.14ms` from Braga, PT
92.82.196.1	AS9050 Orange Romania S.A.	`6.75ms` from Bucharest, RO
119.4.27.241	AS4837 CHINA UNICOM China169 Backbone	`2.66ms` from Chengdu, CN
117.254.185.225	AS9829 National Internet Backbone	`1.76ms` from Chennai, IN
24.247.29.1	AS20115 Charter Communications LLC	`10.70ms` from Chicago, US
67.173.143.193	AS7922 Comcast Cable Communications, LLC	`7.97ms` from Chicago, US
50.223.10.113	AS7922 Comcast Cable Communications, LLC	`3.09ms` from Chicago, US
5.147.188.1	AS3209 Vodafone GmbH	`1.84ms` from Duesseldorf, DE
184.68.93.1	AS6327 Shaw Communications	`7.38ms` from Edmonton, CA
88.67.203.113	AS3209 Vodafone GmbH	`19.21ms` from Frankfurt am Main, DE
109.193.168.1	AS3209 Vodafone GmbH	`8.86ms` from Frankfurt am Main, DE
149.137.212.113	AS48152 Digital Frankfurt GmbH	`1.77ms` from Frankfurt am Main, DE
220.161.114.1	AS4134 CHINANET-BACKBONE	`5.59ms` from Fuzhou, CN

Traceroute

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

traceroute -a -n -q1 210.121.131.58

traceroute to 210.121.131.58 (210.121.131.58): 64 hops max, 52 byte packets

1 [AS15169] 172.253.64.138 1.719 ms

2 [AS3786] 182.162.208.5 1.353 ms

3 *

4 [AS3786] 182.162.64.141 2.025 ms

5 *

6 *

7 [AS3786] 182.162.37.5 3.97 ms

8 *

9 [AS3786] 1.213.106.234 3.332 ms

10 [AS3786] 1.213.140.22 2.923 ms

11 *

12 [AS55627] 210.121.137.5 2.823 ms

13 [AS55627] 210.121.137.3 3.611 ms

14 *

15 *

16 *

17 [AS55627] 210.121.131.58 3.281 ms

Measurement taken from

IPinfo ProbeNet in Seoul, KR

On December 14th 2025

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