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:        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

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

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 223 domain names hosted across 78 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	youreyes.co.kr	111
210.121.176.12	e-plm.kr	11
210.121.197.5	hwacheon.com.mx	5
210.121.164.36	giantstough.net	4
210.121.148.100	kcredit.or.kr	4
210.121.176.122	amel.tk	4
210.121.188.38	ylsolution.net	4
210.121.210.28	archi-training.kr	3
210.121.238.5	osang.com	3
210.121.204.84	n2pmall.co.kr	2
210.121.143.213	inno-horn.com	2
210.121.168.119	rrx-is.com	2
210.121.143.214	inno-heim.com	2
210.121.168.245	ticatica.com	2
210.121.210.14	vballey.com	1
210.121.204.35	dsb2bmall.co.kr	1
210.121.212.151	pignet.or.kr	1
210.121.164.126	livescherished.com	1
210.121.175.174	kfx.kr	1
210.121.162.111	ai-professor.me	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

9,896 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address	ASN	Details
210.121.198.92	AS4766 Korea Telecom	`1.24ms` from Seoul, KR
210.121.128.125	AS4766 Korea Telecom	`1.23ms` from Seoul, KR
210.121.134.240	AS55627 Dongduk Womens University	`2.00ms` from Seoul, KR
210.121.147.222	AS4766 Korea Telecom	`0.99ms` from Seoul, KR
210.121.202.119	AS4766 Korea Telecom	`1.01ms` from Seoul, KR
210.121.216.101	AS4766 Korea Telecom	`1.19ms` from Seoul, KR
210.121.175.202	AS4766 Korea Telecom	`1.07ms` from Seoul, KR
210.121.164.186	AS4766 Korea Telecom	`0.86ms` from Seoul, KR
210.121.250.26	AS4766 Korea Telecom	`4.21ms` from Seoul, KR
210.121.224.218	AS4766 Korea Telecom	`2.29ms` from Seoul, KR
210.121.138.11	AS55627 Dongduk Womens University	`2.21ms` from Seoul, KR
210.121.151.254	AS4766 Korea Telecom	`1.34ms` from Seoul, KR
210.121.242.251	AS4766 Korea Telecom	`2.47ms` from Seoul, KR
210.121.168.143	AS4766 Korea Telecom	`0.86ms` from Seoul, KR
210.121.141.195	AS4766 Korea Telecom	`1.15ms` from Seoul, KR
210.121.153.38	AS18176 KOOKMIN UNIVERSITY	`1.86ms` from Seoul, KR
210.121.188.72	AS4766 Korea Telecom	`1.16ms` from Seoul, KR
210.121.171.189	AS4766 Korea Telecom	`1.64ms` from Seoul, KR
210.121.206.254	AS4766 Korea Telecom	`1.55ms` from Seoul, KR
210.121.208.210	AS4766 Korea Telecom	`0.94ms` from Seoul, KR
210.121.226.246	AS4766 Korea Telecom	`1.61ms` from Seoul, KR
210.121.251.181	AS4766 Korea Telecom	`4.14ms` from Seoul, KR
210.121.155.237	AS18176 KOOKMIN UNIVERSITY	`1.93ms` from Seoul, KR
210.121.238.254	AS4766 Korea Telecom	`1.43ms` from Seoul, KR
210.121.237.8	AS4766 Korea Telecom	`1.30ms` 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
41.110.90.145	AS36947 Telecom Algeria	`11.41ms` from Algiers, DZ
77.164.251.209	AS1136 KPN B.V.	`1.11ms` from Amsterdam, NL
68.230.172.1	AS22773 Cox Communications Inc.	`3.02ms` from Atlanta, US
66.93.66.1	AS5065 Bunny Communications	`0.04ms` from Bangkok, TH
221.193.18.209	AS4837 CHINA UNICOM China169 Backbone	`6.28ms` from Beijing, CN
93.87.255.1	AS8400 TELEKOM SRBIJA a.d.	`2.30ms` from Belgrade, RS
186.81.68.1	AS10620 Telmex Colombia S.A.	`13.91ms` from Bogota, CO
20.72.98.1	AS8075 Microsoft Corporation	`0.30ms` from Boydton, US
187.147.136.1	AS8151 UNINET	`12.66ms` from Cancún, MX
218.6.241.1	AS4134 CHINANET-BACKBONE	`3.01ms` from Chengdu, CN
67.149.194.1	AS12083 WideOpenWest Finance LLC	`8.98ms` from Chicago, US
72.107.141.1	AS6167 Verizon Business	`13.61ms` from Chicago, US
80.63.242.1	AS3292 TDC Holding A/S	`3.10ms` from Copenhagen, DK
186.137.107.1	AS7303 Telecom Argentina S.A.	`3.00ms` from Cordoba, AR
59.44.112.1	AS134762 CHINANET Liaoning province Dalian MAN network	`1.15ms` from Dalian, CN
97.77.46.1	AS11427 Charter Communications Inc	`5.26ms` from Dallas, US
159.118.68.1	AS11492 CABLE ONE, INC.	`18.42ms` from Dallas, US
24.32.69.1	AS19108 Optimum	`9.19ms` from Dallas, US
98.162.250.1	AS22773 Cox Communications Inc.	`5.30ms` from Dallas, US
66.63.246.1	AS32262 Industry I-Net, Inc.	`7.48ms` from Dallas, US
147.136.17.1	AS399060 BEC Communications, LLC	`4.90ms` from Dallas, US
103.96.91.1	AS136563 Iranet Cyber Cafe	`0.52ms` from Dhaka, BD
93.190.254.49	AS21473 PFALZKOM GmbH	`0.28ms` from Frankfurt am Main, DE
222.79.73.17	AS133774 Fuzhou	`1.77ms` from Fuzhou, CN
14.155.191.1	AS4134 CHINANET-BACKBONE	`1.24ms` from Guangzhou, CN

Traceroute

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

traceroute -a -n -q1 -f6 210.121.134.250

traceroute to 210.121.134.250 (210.121.134.250): 64 hops max, 52 byte packets

6 [AS3786] 211.42.224.137 12.1 ms

7 *

8 *

9 *

10 *

11 [AS3786] 1.208.107.190 3.041 ms

12 [AS3786] 1.213.141.10 3.915 ms

13 [AS3786] 118.128.27.234 2.305 ms

14 [AS55627] 210.121.137.5 3.069 ms

15 [AS55627] 210.121.137.4 1.855 ms

16 *

17 *

18 [AS55627] 210.121.134.250 2.493 ms

Measurement taken from

IPinfo ProbeNet in Seoul, KR

On December 28th 2025

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