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 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

Read more

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
210.121.206.80	AS4766 Korea Telecom	`1.27ms` from Seoul, KR
210.121.189.189	AS4766 Korea Telecom	`1.13ms` from Seoul, KR
210.121.198.77	AS4766 Korea Telecom	`1.32ms` from Seoul, KR
210.121.149.209	AS4766 Korea Telecom	`1.03ms` from Seoul, KR
210.121.214.2	AS4766 Korea Telecom	`1.22ms` from Seoul, KR
210.121.153.73	AS18176 KOOKMIN UNIVERSITY	`1.74ms` from Seoul, KR
210.121.190.11	AS4766 Korea Telecom	`0.75ms` from Seoul, KR
210.121.176.157	AS4766 Korea Telecom	`1.31ms` from Seoul, KR
210.121.242.251	AS4766 Korea Telecom	`2.26ms` from Seoul, KR
210.121.163.175	AS4766 Korea Telecom	`1.04ms` from Seoul, KR
210.121.224.218	AS4766 Korea Telecom	`2.15ms` from Seoul, KR
210.121.186.254	AS4766 Korea Telecom	`1.01ms` from Seoul, KR
210.121.132.240	AS55627 Dongduk Womens University	`2.18ms` from Seoul, KR
210.121.240.93	AS4766 Korea Telecom	`4.53ms` from Seoul, KR
210.121.197.5	AS4766 Korea Telecom	`3.08ms` from Seoul, KR
210.121.208.145	AS4766 Korea Telecom	`0.70ms` from Seoul, KR
210.121.235.40	AS4766 Korea Telecom	`1.76ms` from Seoul, KR
210.121.138.240	AS55627 Dongduk Womens University	`2.27ms` from Seoul, KR
210.121.201.209	AS10058 NACUFOK	`3.38ms` from Seoul, KR
210.121.152.194	AS18176 KOOKMIN UNIVERSITY	`1.79ms` from Seoul, KR
210.121.194.146	AS4766 Korea Telecom	`0.76ms` from Seoul, KR
210.121.185.229	AS4766 Korea Telecom	`2.27ms` from Seoul, KR
210.121.218.190	AS4766 Korea Telecom	`1.57ms` from Seoul, KR
210.121.237.8	AS4766 Korea Telecom	`1.15ms` from Seoul, KR
210.121.253.81	AS4766 Korea Telecom	`3.49ms` 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
88.159.49.225	AS1136 KPN B.V.	`2.67ms` from Amsterdam, NL
84.26.70.1	AS33915 Vodafone Libertel B.V.	`2.22ms` from Amsterdam, NL
217.62.191.1	AS33915 Vodafone Libertel B.V.	`4.19ms` from Amsterdam, NL
100.6.90.145	AS701 Verizon Business	`6.66ms` from Ashburn, US
66.168.241.1	AS20115 Charter Communications LLC	`6.37ms` from Atlanta, US
146.113.191.1	AS23089 Hotwire Communications	`12.51ms` from Atlanta, US
171.5.64.1	AS45758 Triple T Broadband Public Company Limited	`8.05ms` from Bangkok, TH
149.233.50.129	AS8881 1&1 Versatel GmbH	`1.22ms` from Berlin, DE
15.200.205.81	AS8987 Amazon Data Services Ireland Ltd	`0.37ms` from Boardman, US
181.99.93.33	AS7303 Telecom Argentina S.A.	`1.81ms` from Buenos Aires, AR
196.214.74.17	AS3741 Dimension Data	`2.52ms` from Cape Town, ZA
195.252.218.1	AS30600 Metronet	`1.24ms` from Chicago, US
141.219.110.1	AS62618 Michigan Technological University	`11.90ms` from Chicago, US
216.196.173.1	AS6181 Cincinnati Bell Telephone Company LLC	`1.36ms` from Cincinnati, US
190.194.246.1	AS7303 Telecom Argentina S.A.	`0.66ms` from Cordoba, AR
209.163.185.129	AS26831 Cameron Communications, LLC	`13.61ms` from Dallas, US
38.10.72.1	AS63100 Carnegie Telephone Company, Inc.	`8.27ms` from Dallas, US
63.79.179.225	AS701 Verizon Business	`1.17ms` from Dallas, US
40.142.208.1	AS7029 Windstream Communications LLC	`4.70ms` from Dallas, US
119.133.168.1	AS136199 CHINANET Guangdong province Yuedong MAN network	`4.64ms` from Guangzhou, CN
106.43.176.1	AS4134 CHINANET-BACKBONE	`1.04ms` from Guiyang, CN
176.72.232.1	AS1759 Telia Finland Oyj	`4.06ms` from Helsinki, FI
14.183.93.81	AS45899 VNPT Corp	`5.90ms` from Ho Chi Minh City, VN
73.166.126.1	AS7922 Comcast Cable Communications, LLC	`4.19ms` from Houston, US
221.227.182.1	AS4134 CHINANET-BACKBONE	`9.86ms` from Huai'an, CN

Traceroute

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

traceroute -a -n -q1 210.121.128.126

traceroute to 210.121.128.126 (210.121.128.126): 64 hops max, 52 byte packets

1 [AS15169] 172.253.64.138 1.717 ms

2 *

3 *

4 [AS4766] 112.174.120.82 2.261 ms

5 *

6 *

7 [AS4766] 210.121.128.126 2.636 ms

Measurement taken from

IPinfo ProbeNet in Seoul, KR

On December 14th 2025

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