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 231 domain names hosted across 80 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	forensictoolkit.co.kr	112
210.121.176.12	singleton.kr	11
210.121.197.5	hwacheon.mx	5
210.121.176.122	amel.ga	4
210.121.164.36	bim-warehouse.com	4
210.121.188.38	ylsolution.net	4
210.121.148.100	kcredit.or.kr	4
210.121.210.28	archi-training.kr	3
210.121.238.5	osang.com	3
210.121.187.179	won3d.site	3
210.121.151.145	worlddevelopmentbank.com	3
210.121.143.214	catchupcat.com	2
210.121.143.213	innohorn.com	2
210.121.168.119	tt-is.com	2
210.121.164.40	nevertila.com	2
210.121.204.84	dajeong-tools.com	2
210.121.168.245	e-ilshin.com	2
210.121.164.5	buyasaka.com	1
210.121.175.174	kfx.kr	1
210.121.223.74	srpost.co.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

9,955 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address	ASN	Details
210.121.155.23	AS18176 KOOKMIN UNIVERSITY	`2.02ms` from Seoul, KR
210.121.141.195	AS4766 Korea Telecom	`1.02ms` from Seoul, KR
210.121.234.47	AS4766 Korea Telecom	`1.30ms` from Seoul, KR
210.121.189.76	AS4766 Korea Telecom	`1.15ms` from Seoul, KR
210.121.184.18	AS4766 Korea Telecom	`0.98ms` from Seoul, KR
210.121.222.70	AS4766 Korea Telecom	`1.02ms` from Seoul, KR
210.121.147.193	AS4766 Korea Telecom	`0.90ms` from Seoul, KR
210.121.237.8	AS4766 Korea Telecom	`1.06ms` from Seoul, KR
210.121.173.12	AS4766 Korea Telecom	`1.02ms` from Seoul, KR
210.121.138.253	AS55627 Dongduk Womens University	`2.21ms` from Seoul, KR
210.121.167.30	AS4766 Korea Telecom	`0.95ms` from Seoul, KR
210.121.165.122	AS4766 Korea Telecom	`1.05ms` from Seoul, KR
210.121.174.254	AS4766 Korea Telecom	`1.44ms` from Seoul, KR
210.121.246.72	AS4766 Korea Telecom	`2.32ms` from Seoul, KR
210.121.214.234	AS4766 Korea Telecom	`0.98ms` from Seoul, KR
210.121.198.82	AS4766 Korea Telecom	`1.15ms` from Seoul, KR
210.121.226.92	AS4766 Korea Telecom	`1.39ms` from Seoul, KR
210.121.146.254	AS4766 Korea Telecom	`0.93ms` from Seoul, KR
210.121.235.78	AS4766 Korea Telecom	`1.70ms` from Seoul, KR
210.121.180.118	AS4766 Korea Telecom	`0.80ms` from Seoul, KR
210.121.232.33	AS4766 Korea Telecom	`1.78ms` from Seoul, KR
210.121.197.5	AS4766 Korea Telecom	`2.41ms` from Seoul, KR
210.121.129.190	AS4766 Korea Telecom	`1.18ms` from Seoul, KR
210.121.194.146	AS4766 Korea Telecom	`0.75ms` from Seoul, KR
210.121.152.83	AS18176 KOOKMIN UNIVERSITY	`2.00ms` 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
178.85.207.1	AS33915 Vodafone Libertel B.V.	`0.88ms` from Amsterdam, NL
62.194.104.1	AS33915 Vodafone Libertel B.V.	`0.80ms` from Amsterdam, NL
46.30.117.33	AS51978 WEMACOM Telekommunikation GmbH	`8.60ms` from Amsterdam, NL
198.124.128.1	AS291 ESnet	`7.53ms` from Ashburn, US
93.171.1.1	AS200218 Tvoy Novy Telecom LLP	`2.26ms` from Astana, KZ
66.168.241.1	AS20115 Charter Communications LLC	`6.40ms` from Atlanta, US
221.216.107.97	AS4808 China Unicom Beijing Province Network	`2.45ms` from Beijing, CN
5.172.38.1	AS9125 Drustvo za telekomunikacije Orion telekom doo Beograd-Zemun	`0.70ms` from Belgrade, RS
190.8.205.193	AS14080 Telmex Colombia S.A.	`1.17ms` from Bogota, CO
70.172.198.1	AS22773 Cox Communications Inc.	`4.61ms` from Boston, US
191.217.72.1	AS8167 V tal	`3.83ms` from Brasilia, BR
81.164.100.1	AS6848 Telenet BV	`3.18ms` from Brussels, BE
89.165.204.113	AS48161 NEXTGEN COMMUNICATIONS SRL	`8.16ms` from Bucharest, RO
92.85.53.1	AS9050 Orange Romania S.A.	`4.85ms` from Bucharest, RO
41.238.96.1	AS8452 TE-AS	`4.39ms` from Cairo, EG
204.144.229.129	AS393238 ImOn Communications, LLC	`5.49ms` from Chicago, US
141.219.110.1	AS62618 Michigan Technological University	`16.53ms` from Chicago, US
50.238.76.177	AS7922 Comcast Cable Communications, LLC	`1.02ms` from Chicago, US
162.151.90.33	AS7922 Comcast Cable Communications, LLC	`1.35ms` from Chicago, US
2.104.225.225	AS3292 TDC Holding A/S	`3.09ms` from Copenhagen, DK
181.88.174.193	AS7303 Telecom Argentina S.A.	`0.39ms` from Cordoba, AR
189.11.130.1	AS8167 V tal	`8.79ms` from Curitiba, BR
97.77.46.1	AS11427 Charter Communications Inc	`5.31ms` from Dallas, US
68.170.219.129	AS17306 JAB Wireless, INC.	`2.94ms` from Dallas, US
174.76.123.193	AS22773 Cox Communications Inc.	`5.07ms` from Dallas, US

Traceroute

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

traceroute -a -n -q1 210.121.165.86

traceroute to 210.121.165.86 (210.121.165.86): 64 hops max, 52 byte packets

1 [AS31898] 140.91.214.27 0.07 ms

2 [AS4766] 218.145.32.254 0.717 ms

3 *

4 *

5 [AS4766] 112.174.104.194 1.158 ms

6 *

7 *

8 [AS4766] 210.121.165.86 1.535 ms

Measurement taken from

IPinfo ProbeNet in Seoul, KR

On November 28th 2025

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