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
210.121.154.117	AS18176 KOOKMIN UNIVERSITY	`1.75ms` from Incheon, KR
210.121.197.6	AS4766 Korea Telecom	`1.99ms` from Seoul, KR
210.121.177.19	AS4766 Korea Telecom	`0.81ms` from Seoul, KR
210.121.174.233	AS4766 Korea Telecom	`1.39ms` from Seoul, KR
210.121.190.3	AS4766 Korea Telecom	`0.74ms` from Seoul, KR
210.121.198.70	AS4766 Korea Telecom	`1.41ms` from Seoul, KR
210.121.143.171	AS4766 Korea Telecom	`1.29ms` from Seoul, KR
210.121.133.240	AS55627 Dongduk Womens University	`1.94ms` from Seoul, KR
210.121.151.217	AS4766 Korea Telecom	`1.26ms` from Seoul, KR
210.121.162.199	AS4766 Korea Telecom	`1.20ms` from Seoul, KR
210.121.186.127	AS4766 Korea Telecom	`0.83ms` from Seoul, KR
210.121.202.78	AS4766 Korea Telecom	`1.00ms` from Seoul, KR
210.121.158.31	AS18176 KOOKMIN UNIVERSITY	`1.69ms` from Incheon, KR
210.121.193.126	AS4766 Korea Telecom	`1.25ms` from Seoul, KR
210.121.210.59	AS4766 Korea Telecom	`0.98ms` from Seoul, KR
210.121.168.171	AS4766 Korea Telecom	`0.73ms` from Seoul, KR
210.121.128.125	AS4766 Korea Telecom	`1.13ms` from Seoul, KR
210.121.179.199	AS4766 Korea Telecom	`0.80ms` from Seoul, KR
210.121.172.254	AS4766 Korea Telecom	`1.38ms` from Incheon, KR
210.121.194.153	AS4766 Korea Telecom	`0.75ms` from Seoul, KR
210.121.153.85	AS18176 KOOKMIN UNIVERSITY	`1.70ms` from Incheon, KR
210.121.140.240	AS55627 Dongduk Womens University	`2.21ms` from Incheon, KR
210.121.214.53	AS4766 Korea Telecom	`1.06ms` from Seoul, KR
210.121.175.202	AS4766 Korea Telecom	`0.93ms` from Seoul, KR
210.121.211.246	AS4766 Korea Telecom	`2.28ms` 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
20.238.141.17	AS8075 Microsoft Corporation	`0.21ms` from Amsterdam, NL
194.219.61.97	AS1241 Forthnet	`1.10ms` from Athens, GR
195.97.15.49	AS3329 VODAFONE-PANAFON HELLENIC TELECOMMUNICATIONS COMPANY SA	`1.19ms` from Athens, GR
168.182.110.1	AS21713 Bulloch County Rural Telephone Cooperative, Inc.	`6.09ms` from Atlanta, US
162.196.210.193	AS7018 AT&T Enterprises, LLC	`12.36ms` from Atlanta, US
60.2.132.177	AS4837 CHINA UNICOM China169 Backbone	`13.38ms` from Beijing, CN
4.79.7.1	AS3356 Level 3 Parent, LLC	`0.35ms` from Boston, US
95.76.124.1	AS12302 Vodafone Romania S.A.	`12.79ms` from Bucharest, RO
92.85.53.1	AS9050 Orange Romania S.A.	`4.81ms` from Bucharest, RO
196.214.74.17	AS3741 Dimension Data	`2.34ms` from Cape Town, ZA
122.142.123.49	AS4837 CHINA UNICOM China169 Backbone	`1.90ms` from Changchun, CN
113.222.170.81	AS4134 CHINANET-BACKBONE	`2.31ms` from Changsha, CN
222.243.198.113	AS4134 CHINANET-BACKBONE	`5.82ms` from Changsha, CN
221.182.100.113	AS9808 China Mobile Communications Group Co., Ltd.	`10.02ms` from Chengdu, CN
183.221.211.1	AS9808 China Mobile Communications Group Co., Ltd.	`5.76ms` from Chengdu, CN
117.247.181.1	AS9829 National Internet Backbone	`3.41ms` from Chennai, IN
50.82.208.1	AS30036 Mediacom Communications Corp	`2.34ms` from Chicago, US
71.29.20.1	AS7029 Windstream Communications LLC	`14.25ms` from Chicago, US
124.162.64.1	AS4837 CHINA UNICOM China169 Backbone	`4.29ms` from Chongqing, CN
74.218.67.17	AS10796 Charter Communications Inc	`2.48ms` from Columbus, US
66.63.246.1	AS32262 Industry I-Net, Inc.	`7.50ms` from Dallas, US
147.136.17.1	AS399060 BEC Communications, LLC	`4.60ms` from Dallas, US
65.140.132.129	AS209 CenturyLink Communications, LLC	`0.59ms` from Denver, US
98.250.222.1	AS7922 Comcast Cable Communications, LLC	`2.62ms` from Detroit, US
109.75.63.129	AS47139 CJSC INDIGO TAJIKISTAN	`0.53ms` from Dushanbe, TJ

Traceroute

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

traceroute -a -n -q1 210.121.163.254

traceroute to 210.121.163.254 (210.121.163.254): 64 hops max, 52 byte packets

1 [AS31898] 140.91.214.47 0.098 ms

2 *

3 *

4 *

5 [AS4766] 112.174.120.198 0.783 ms

6 *

7 [AS4766] 210.121.163.254 1.869 ms

Measurement taken from

IPinfo ProbeNet in Seoul, KR

On January 19th 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.

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