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:        hostmaster@nic.or.kr 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:         kornet_ip@kt.com
nic-hdl:        IA9-KR
mnt-by:         MNT-KRNIC-AP
changed:        hostmaster@nic.or.kr 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:         kornet_ip@kt.com
nic-hdl:        IM9-KR
mnt-by:         MNT-KRNIC-AP
changed:        hostmaster@nic.or.kr 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 220 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	snsforensic.com	108
210.121.176.12	plm.co.kr	11
210.121.197.5	hwacheon.com.mx	5
210.121.176.122	amel.gq	4
210.121.148.100	kcredit.or.kr	4
210.121.188.38	savorfamily.com	4
210.121.164.36	liga-tex.com	4
210.121.210.28	smartcities.kr	3
210.121.238.5	obitkorea.com	3
210.121.143.213	innohorn.com	2
210.121.168.119	tt-is.com	2
210.121.168.245	e-ilshin.com	2
210.121.204.84	dajeong-tools.com	2
210.121.143.214	inno-heim.com	2
210.121.212.185	aiak.or.kr	1
210.121.223.74	srpost.co.kr	1
210.121.223.122	kroisos.kr	1
210.121.210.14	vballey.com	1
210.121.164.4	amranest.net	1
210.121.168.246	isunicom.com	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

Read more

Pingable IPs

9,756 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address	ASN	Details
210.121.249.201	AS4766 Korea Telecom	`4.40ms` from Incheon, KR
210.121.128.125	AS4766 Korea Telecom	`1.13ms` from Seoul, KR
210.121.197.6	AS4766 Korea Telecom	`1.99ms` from Seoul, KR
210.121.218.190	AS4766 Korea Telecom	`1.61ms` from Seoul, KR
210.121.170.94	AS4766 Korea Telecom	`1.36ms` from Seoul, KR
210.121.252.69	AS4766 Korea Telecom	`5.31ms` from Seoul, KR
210.121.134.240	AS55627 Dongduk Womens University	`2.11ms` from Seoul, KR
210.121.173.25	AS4766 Korea Telecom	`0.97ms` from Seoul, KR
210.121.216.97	AS4766 Korea Telecom	`1.08ms` from Seoul, KR
210.121.133.240	AS55627 Dongduk Womens University	`1.94ms` from Seoul, KR
210.121.154.117	AS18176 KOOKMIN UNIVERSITY	`1.75ms` from Incheon, KR
210.121.240.239	AS4766 Korea Telecom	`4.79ms` from Seoul, KR
210.121.226.246	AS4766 Korea Telecom	`1.47ms` from Seoul, KR
210.121.171.116	AS4766 Korea Telecom	`1.18ms` from Seoul, KR
210.121.210.59	AS4766 Korea Telecom	`0.98ms` from Seoul, KR
210.121.186.127	AS4766 Korea Telecom	`0.83ms` from Seoul, KR
210.121.188.131	AS4766 Korea Telecom	`1.10ms` from Seoul, KR
210.121.203.52	AS4766 Korea Telecom	`0.66ms` from Seoul, KR
210.121.211.246	AS4766 Korea Telecom	`2.28ms` from Seoul, KR
210.121.142.222	AS4766 Korea Telecom	`1.11ms` from Seoul, KR
210.121.222.3	AS4766 Korea Telecom	`0.99ms` from Seoul, KR
210.121.180.118	AS4766 Korea Telecom	`0.73ms` from Seoul, KR
210.121.174.233	AS4766 Korea Telecom	`1.39ms` from Seoul, KR
210.121.147.193	AS4766 Korea Telecom	`0.86ms` from Seoul, KR
210.121.246.78	AS4766 Korea Telecom	`2.49ms` 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
83.84.133.1	AS33915 Vodafone Libertel B.V.	`5.84ms` from Amsterdam, NL
128.8.39.81	AS27 University of Maryland	`2.72ms` from Ashburn, US
52.226.84.129	AS8075 Microsoft Corporation	`0.52ms` from Ashburn, US
194.219.61.97	AS1241 Forthnet	`1.10ms` from Athens, GR
65.188.32.1	AS11426 Charter Communications Inc	`8.89ms` from Atlanta, US
66.85.239.1	AS26827 EPB Fiber Optics	`3.69ms` from Atlanta, US
206.85.199.1	AS33647 Yadkin Valley Telephone	`11.27ms` from Atlanta, US
161.82.87.1	AS398025 Cumberland Connect	`7.49ms` from Atlanta, US
119.46.57.49	AS7470 TRUE INTERNET Co.,Ltd.	`2.14ms` from Bangkok, TH
164.115.31.1	AS9835 Government Information Technology Services	`2.49ms` from Bangkok, TH
60.2.132.177	AS4837 CHINA UNICOM China169 Backbone	`13.38ms` from Beijing, CN
188.81.246.1	AS3243 MEO - SERVICOS DE COMUNICACOES E MULTIMEDIA S.A.	`1.15ms` from Braga, PT
213.177.82.129	AS13226 CYBERNET SA	`1.42ms` from Brussels, BE
170.51.74.1	AS11664 Techtel LMDS Comunicaciones Interactivas S.A.	`18.56ms` from Buenos Aires, AR
149.78.43.1	AS263801 LINKEAR SRL	`6.09ms` from Buenos Aires, AR
190.19.46.1	AS7303 Telecom Argentina S.A.	`1.58ms` from Buenos Aires, AR
197.146.32.1	AS36884 Wana Corporate	`3.64ms` from Casablanca, MA
182.138.120.1	AS4134 CHINANET-BACKBONE	`1.87ms` from Chengdu, CN
117.196.112.1	AS9829 National Internet Backbone	`7.14ms` from Chennai, IN
68.85.182.161	AS7922 Comcast Cable Communications, LLC	`1.38ms` from Chicago, US
216.196.173.1	AS6181 Cincinnati Bell Telephone Company LLC	`1.34ms` from Cincinnati, US
132.255.249.65	AS264520 Radioscan Telecom Com. De Compon. Eletr. Ltda-EPP	`7.19ms` from Curitiba, BR
201.64.90.241	AS4230 CLARO S.A.	`1.08ms` from Curitiba, BR
38.10.111.17	AS17426 Primesoftex Ltd	`1.53ms` from Delhi, IN
90.213.36.177	AS5607 Sky UK Limited	`1.78ms` from Erith, GB

Traceroute

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

traceroute -a -n -q1 210.121.156.72

traceroute to 210.121.156.72 (210.121.156.72): 64 hops max, 52 byte packets

1 [AS31898] 140.91.214.44 0.089 ms

2 [AS3786] 211.118.152.142 0.722 ms

3 *

4 *

5 *

6 *

7 [AS3786] 115.89.206.242 2.916 ms

8 *

9 [AS18176] 210.121.156.72 2.799 ms

Measurement taken from

IPinfo ProbeNet in Seoul, KR

On January 19th 2026

What are IP address ranges?

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