210.121.128.0/17

AS4766 · Korea Telecom

Need more data or want to access it via API or data downloads? Sign up to get free access

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 221 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	cdrfile.co.kr	112
210.121.223.122	avicom.co.kr	5
210.121.197.5	hwacheon.mx	5
210.121.176.12	e-plm.kr	5
210.121.188.38	ylsolution.net	4
210.121.176.122	amel.ga	4
210.121.164.36	bim-warehouse.com	4
210.121.148.100	kcredit.or.kr	4
210.121.238.5	osang.com	3
210.121.210.28	archi-training.kr	3
210.121.168.245	e-ilshin.com	2
210.121.204.84	dajeong-tools.com	2
210.121.168.119	rrx-is.com	2
210.121.143.214	inno-heim.com	2
210.121.143.213	innohorn.com	2
210.121.204.19	dstoolpia.co.kr	1
210.121.129.237	bizment.kr	1
210.121.212.151	pignet.or.kr	1
210.121.226.21	taskez.net	1
210.121.164.40	nevertila.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

9,788 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address	ASN	Details
210.121.241.202	AS4766 Korea Telecom	`2.99ms` from Incheon, KR
210.121.179.199	AS4766 Korea Telecom	`0.79ms` from Seoul, KR
210.121.218.190	AS4766 Korea Telecom	`1.60ms` from Seoul, KR
210.121.154.170	AS18176 KOOKMIN UNIVERSITY	`1.71ms` from Incheon, KR
210.121.147.193	AS4766 Korea Telecom	`0.86ms` from Seoul, KR
210.121.243.129	AS4766 Korea Telecom	`2.80ms` from Seoul, KR
210.121.207.254	AS4766 Korea Telecom	`1.38ms` from Seoul, KR
210.121.211.196	AS4766 Korea Telecom	`2.15ms` from Seoul, KR
210.121.160.181	AS4766 Korea Telecom	`0.83ms` from Seoul, KR
210.121.204.74	AS4766 Korea Telecom	`1.47ms` from Seoul, KR
210.121.203.59	AS4766 Korea Telecom	`0.63ms` from Seoul, KR
210.121.152.204	AS18176 KOOKMIN UNIVERSITY	`1.69ms` from Incheon, KR
210.121.248.214	AS4766 Korea Telecom	`2.71ms` from Incheon, KR
210.121.242.251	AS4766 Korea Telecom	`2.27ms` from Seoul, KR
210.121.224.218	AS4766 Korea Telecom	`2.03ms` from Seoul, KR
210.121.236.105	AS4766 Korea Telecom	`1.40ms` from Seoul, KR
210.121.129.176	AS4766 Korea Telecom	`1.14ms` from Seoul, KR
210.121.137.12	AS55627 Dongduk Womens University	`1.73ms` from Seoul, KR
210.121.238.254	AS4766 Korea Telecom	`0.54ms` from Incheon, KR
210.121.227.158	AS4766 Korea Telecom	`1.76ms` from Incheon, KR
210.121.138.240	AS55627 Dongduk Womens University	`2.11ms` from Incheon, KR
210.121.225.22	AS4766 Korea Telecom	`1.50ms` from Seoul, KR
210.121.247.133	AS4766 Korea Telecom	`2.24ms` from Seoul, KR
210.121.194.146	AS4766 Korea Telecom	`0.77ms` from Seoul, KR
210.121.131.58	AS55627 Dongduk Womens University	`2.08ms` 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
92.111.76.177	AS33915 Vodafone Libertel B.V.	`7.61ms` from Amsterdam, NL
82.172.16.1	AS50266 Odido Netherlands B.V.	`3.57ms` from Amsterdam, NL
123.118.28.17	AS4808 China Unicom Beijing Province Network	`3.36ms` from Beijing, CN
190.146.34.1	AS10620 Telmex Colombia S.A.	`1.61ms` from Bogota, CO
181.206.123.1	AS27831 Colombia Móvil	`8.07ms` from Bogotá, CO
90.95.166.145	AS8953 Orange Romania S.A.	`6.58ms` from Bucharest, RO
187.179.147.33	AS265594 Television Internacional, S.A. de C.V.	`13.13ms` from Dallas, US
216.189.11.225	AS30436 Elite Broadband LLC	`11.72ms` from Denver, US
73.161.156.1	AS7922 Comcast Cable Communications, LLC	`6.23ms` from Detroit, US
93.158.204.1	AS50673 Serverius	`0.14ms` from Dronten, NL
194.127.175.225	AS34646 Arne Steinkamm	`2.95ms` from Frankfurt am Main, DE
76.11.73.1	AS11260 EastLink	`10.83ms` from Fredericton, CA
113.68.24.1	AS4134 CHINANET-BACKBONE	`3.17ms` from Guangzhou, CN
125.124.76.81	AS58461 CT-HangZhou-IDC	`5.55ms` from Hangzhou, CN
122.159.29.1	AS4837 CHINA UNICOM China169 Backbone	`2.96ms` from Harbin, CN
220.86.251.129	AS4766 Korea Telecom	`3.41ms` from Incheon, KR
119.217.148.97	AS4766 Korea Telecom	`5.39ms` from Incheon, KR
211.117.186.97	AS9318 SK Broadband Co Ltd	`5.42ms` from Incheon, KR
1.248.226.1	AS9318 SK Broadband Co Ltd	`1.42ms` from Incheon, KR
78.160.232.1	AS9121 Turk Telekomunikasyon Anonim Sirketi	`1.04ms` from Istanbul, TR
85.107.48.1	AS9121 Turk Telekomunikasyon Anonim Sirketi	`0.90ms` from Istanbul, TR
178.169.70.49	AS39785 Axioma, LLC	`0.42ms` from Krasnoyarsk, RU
86.188.104.33	AS2856 British Telecommunications PLC	`4.18ms` from London, GB
178.254.68.1	AS6661 POST Luxembourg	`0.29ms` from Luxembourg, LU
77.133.180.1	AS15557 Societe Francaise Du Radiotelephone - SFR SA	`17.50ms` from Lyon, FR

Traceroute

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

traceroute -a -n -q1 210.121.139.240

traceroute to 210.121.139.240 (210.121.139.240): 64 hops max, 52 byte packets

1 [AS26383] 23.164.240.1 0.547 ms

2 [AS9002] 87.245.248.132 0.454 ms

3 [AS9002] 87.245.232.78 24.476 ms

4 [] 80.81.193.16 24.291 ms

5 *

6 *

7 *

8 *

9 [AS3786] 1.213.114.166 254.821 ms

10 [AS3786] 1.213.141.10 262.817 ms

11 [AS3786] 118.128.27.234 239.857 ms

12 [AS55627] 210.121.137.5 242.902 ms

13 [AS55627] 210.121.137.3 239.569 ms

14 *

15 *

16 *

17 [AS55627] 210.121.139.240 242.876 ms

Measurement taken from

IPinfo ProbeNet in Helsinki, FI

On February 7th 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.

Traffic works its way around the internet based on the routing table, which contains a list of networks and their associated netblocks.

An API built with users in mind: reliable, accurate, and easy-to-use

Discover why industry-leading companies around the globe love our data. IPinfo's accurate insights fuel use cases from cybersecurity, data enrichment, web personalization, and much more.

Get Started for Free Contact Sales