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:        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

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

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

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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
210.121.252.69	AS4766 Korea Telecom	`5.31ms` from Seoul, KR
210.121.184.18	AS4766 Korea Telecom	`0.90ms` from Seoul, KR
210.121.236.105	AS4766 Korea Telecom	`1.42ms` from Seoul, KR
210.121.233.21	AS4766 Korea Telecom	`1.68ms` from Seoul, KR
210.121.153.85	AS18176 KOOKMIN UNIVERSITY	`1.70ms` from Incheon, KR
210.121.232.1	AS4766 Korea Telecom	`1.88ms` from Seoul, KR
210.121.148.34	AS4766 Korea Telecom	`1.58ms` from Seoul, KR
210.121.247.158	AS4766 Korea Telecom	`2.31ms` from Seoul, KR
210.121.173.25	AS4766 Korea Telecom	`0.97ms` from Seoul, KR
210.121.223.8	AS4766 Korea Telecom	`0.75ms` from Seoul, KR
210.121.172.254	AS4766 Korea Telecom	`1.38ms` from Incheon, KR
210.121.242.225	AS4766 Korea Telecom	`2.41ms` from Incheon, KR
210.121.130.66	AS4766 Korea Telecom	`0.94ms` from Seoul, KR
210.121.133.240	AS55627 Dongduk Womens University	`1.94ms` from Seoul, KR
210.121.219.208	AS4766 Korea Telecom	`1.66ms` from Incheon, KR
210.121.225.22	AS4766 Korea Telecom	`1.52ms` from Seoul, KR
210.121.200.194	AS4766 Korea Telecom	`0.93ms` from Seoul, KR
210.121.195.251	AS4766 Korea Telecom	`0.87ms` from Seoul, KR
210.121.132.240	AS55627 Dongduk Womens University	`2.19ms` from Seoul, KR
210.121.155.30	AS18176 KOOKMIN UNIVERSITY	`1.78ms` from Incheon, KR
210.121.159.149	AS18176 KOOKMIN UNIVERSITY	`1.77ms` from Incheon, KR
210.121.140.240	AS55627 Dongduk Womens University	`2.21ms` from Incheon, KR
210.121.167.145	AS4766 Korea Telecom	`1.09ms` from Seoul, KR
210.121.193.126	AS4766 Korea Telecom	`1.25ms` from Seoul, KR
210.121.188.131	AS4766 Korea Telecom	`1.10ms` 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
216.30.247.33	AS15227 LUMOS Networks, Inc.	`9.56ms` from Ashburn, US
70.21.104.1	AS701 Verizon Business	`1.82ms` from Ashburn, US
12.209.17.33	AS7018 AT&T Enterprises, LLC	`0.72ms` from Atlanta, US
125.34.108.129	AS4808 China Unicom Beijing Province Network	`2.29ms` from Beijing, CN
82.165.206.113	AS8560 IONOS SE	`0.64ms` from Berlin, DE
2.83.55.1	AS3243 MEO - SERVICOS DE COMUNICACOES E MULTIMEDIA S.A.	`2.14ms` from Braga, PT
91.236.58.1	AS48837 SC ALFA WEB SRL	`1.68ms` from Bucharest, RO
186.127.167.1	AS7303 Telecom Argentina S.A.	`1.75ms` from Buenos Aires, AR
222.210.248.1	AS4134 CHINANET-BACKBONE	`4.79ms` from Chengdu, CN
222.215.218.1	AS4134 CHINANET-BACKBONE	`8.44ms` from Chengdu, CN
119.5.123.129	AS4837 CHINA UNICOM China169 Backbone	`10.95ms` from Chengdu, CN
202.138.103.33	AS18101 Reliance Communications Ltd.DAKC MUMBAI	`6.60ms` from Chennai, IN
24.144.147.1	AS27364 Armstrong	`6.97ms` from Cleveland, US
200.103.252.81	AS8167 V tal	`5.86ms` from Curitiba, BR
75.224.65.97	AS6167 Verizon Business	`19.12ms` from Dallas, US
73.78.154.1	AS7922 Comcast Cable Communications, LLC	`11.47ms` from Denver, US
86.41.158.1	AS5466 Eircom Limited	`0.95ms` from Dublin, IE
95.222.248.1	AS3209 Vodafone GmbH	`0.54ms` from Frankfurt am Main, DE
60.188.212.1	AS4134 CHINANET-BACKBONE	`4.38ms` from Hangzhou, CN
47.14.122.113	AS20115 Charter Communications LLC	`14.64ms` from Herndon, US
103.118.201.49	AS138968 rainbow network limited	`1.06ms` from Hong Kong, HK
61.254.123.193	AS9318 SK Broadband Co Ltd	`1.77ms` from Incheon, KR
197.89.249.1	AS20011 Dimension Data	`1.81ms` from Johannesburg, ZA
87.117.166.1	AS24810 TELESET KAZAN	`0.81ms` from Kazan, RU
217.36.11.17	AS2856 British Telecommunications PLC	`8.13ms` from London, GB

Traceroute

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

traceroute -a -n -q1 210.121.135.248

traceroute to 210.121.135.248 (210.121.135.248): 64 hops max, 52 byte packets

1 [AS15169] 172.253.64.143 1.466 ms

2 [AS3786] 182.162.216.45 1.111 ms

3 *

4 *

5 [AS3786] 182.162.36.30 1.719 ms

6 *

7 [AS3786] 182.162.36.13 1.718 ms

8 [AS3786] 61.43.224.57 1.593 ms

9 [AS3786] 1.208.114.166 2.801 ms

10 [AS3786] 1.208.140.50 2.386 ms

11 [AS3786] 118.128.27.234 2.845 ms

12 [AS55627] 210.121.137.5 2.228 ms

13 [AS55627] 210.121.137.4 2.042 ms

14 *

15 *

16 [AS55627] 210.121.135.248 3.183 ms

Measurement taken from

IPinfo ProbeNet in Seoul, KR

On January 18th 2026

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