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:        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

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

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 224 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.co.kr	11
210.121.197.5	hwacheon.com	5
210.121.176.122	holo.cf	4
210.121.148.100	kcredit.or.kr	4
210.121.164.36	fz-indecoration.com	4
210.121.188.38	ylsolution.net	4
210.121.210.28	archi-training.kr	3
210.121.238.5	osang.com	3
210.121.168.119	rrx-is.com	2
210.121.151.145	latexian.com	2
210.121.143.213	innohorn.com	2
210.121.143.214	catchupcat.com	2
210.121.204.84	dajeong-tools.com	2
210.121.168.245	e-ilshin.com	2
210.121.150.61	aplusassettower.com	1
210.121.164.40	nevertila.com	1
210.121.223.18	mzigi.co.kr	1
210.121.164.125	landwaretiles.com	1
210.121.210.14	vballey.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

9,634 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address	ASN	Details
210.121.158.57	AS18176 KOOKMIN UNIVERSITY	`1.82ms` from Seoul, KR
210.121.194.153	AS4766 Korea Telecom	`0.72ms` from Seoul, KR
210.121.233.21	AS4766 Korea Telecom	`1.75ms` from Seoul, KR
210.121.219.226	AS4766 Korea Telecom	`1.35ms` from Seoul, KR
210.121.138.11	AS55627 Dongduk Womens University	`2.17ms` from Seoul, KR
210.121.236.1	AS4766 Korea Telecom	`1.43ms` from Seoul, KR
210.121.163.40	AS4766 Korea Telecom	`1.26ms` from Seoul, KR
210.121.223.53	AS4766 Korea Telecom	`0.84ms` from Seoul, KR
210.121.198.96	AS4766 Korea Telecom	`1.16ms` from Seoul, KR
210.121.200.194	AS4766 Korea Telecom	`0.96ms` from Seoul, KR
210.121.189.196	AS4766 Korea Telecom	`1.18ms` from Seoul, KR
210.121.193.182	AS4766 Korea Telecom	`1.18ms` from Seoul, KR
210.121.157.113	AS18176 KOOKMIN UNIVERSITY	`1.88ms` from Seoul, KR
210.121.159.19	AS18176 KOOKMIN UNIVERSITY	`1.73ms` from Seoul, KR
210.121.238.254	AS4766 Korea Telecom	`1.27ms` from Seoul, KR
210.121.206.225	AS4766 Korea Telecom	`1.41ms` from Seoul, KR
210.121.231.126	AS4766 Korea Telecom	`1.77ms` from Seoul, KR
210.121.128.125	AS4766 Korea Telecom	`1.05ms` from Seoul, KR
210.121.134.240	AS55627 Dongduk Womens University	`2.05ms` from Seoul, KR
210.121.203.59	AS4766 Korea Telecom	`0.63ms` from Seoul, KR
210.121.216.97	AS4766 Korea Telecom	`1.07ms` from Seoul, KR
210.121.178.50	AS4766 Korea Telecom	`1.06ms` from Seoul, KR
210.121.179.211	AS4766 Korea Telecom	`0.81ms` from Seoul, KR
210.121.142.222	AS4766 Korea Telecom	`1.16ms` from Seoul, KR
210.121.226.5	AS4766 Korea Telecom	`1.39ms` 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.	`2.66ms` from Amsterdam, NL
82.172.16.1	AS50266 Odido Netherlands B.V.	`3.41ms` from Amsterdam, NL
66.112.202.1	AS394564 Spectrotel Inc	`0.76ms` from Atlanta, US
1.92.201.17	AS55990 Huawei Cloud Service data center	`8.62ms` from Beijing, CN
70.172.198.1	AS22773 Cox Communications Inc.	`4.70ms` from Boston, US
23.244.83.1	AS11776 Breezeline	`10.79ms` from Chicago, US
24.101.139.97	AS27364 Armstrong	`8.97ms` from Chicago, US
46.32.152.1	AS211418 KABELPLUS.DK P/S	`4.05ms` from Copenhagen, DK
72.24.139.1	AS11492 CABLE ONE, INC.	`2.95ms` from Dallas, US
124.253.205.129	AS17917 Quadrant Televentures Limited	`8.96ms` from Delhi, IN
5.147.188.1	AS3209 Vodafone GmbH	`1.74ms` from Duesseldorf, DE
79.251.150.1	AS3320 Deutsche Telekom AG	`2.53ms` from Duesseldorf, DE
92.79.65.145	AS3209 Vodafone GmbH	`1.49ms` from Frankfurt am Main, DE
45.132.88.1	AS44486 synlinq.de	`0.55ms` from Frankfurt am Main, DE
60.188.212.1	AS4134 CHINANET-BACKBONE	`4.43ms` from Hangzhou, CN
38.249.138.1	AS135357 HONG KONG KOWLOON TELECOMMUNICATIONS CO.,LIMITED	`2.31ms` from Hong Kong, HK
185.85.205.1	AS201079 GarantiServer Datacenter	`1.21ms` from Istanbul, TR
179.49.137.1	AS271208 Stream Net	`9.06ms` from Joao Pessoa, BR
95.188.6.177	AS12389 PJSC Rostelecom	`0.91ms` from Krasnoyarsk, RU
31.52.220.113	AS2856 British Telecommunications PLC	`8.29ms` from London, GB
23.38.162.193	AS16625 Akamai Technologies, Inc.	`0.62ms` from Los Angeles, US
12.38.43.33	AS7018 AT&T Enterprises, LLC	`1.34ms` from Los Angeles, US
88.142.105.1	AS15557 Societe Francaise Du Radiotelephone - SFR SA	`15.09ms` from Lyon, FR
213.97.250.1	AS3352 TELEFONICA DE ESPANA S.A.U.	`1.30ms` from Madrid, ES
71.204.220.1	AS7922 Comcast Cable Communications, LLC	`4.16ms` from Manassas, US

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 [AS31898] 140.91.214.7 0.226 ms

2 *

3 *

4 *

5 [AS4766] 112.174.58.58 1.463 ms

6 *

7 *

8 [AS4766] 210.121.128.126 1.502 ms

Measurement taken from

IPinfo ProbeNet in Seoul, KR

On December 20th 2025

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