210.121.154.0/24

AS18176 · KOOKMIN UNIVERSITY

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Summary

Country	South Korea
Domain	kt.com
ASN	AS18176
Parent Range	210.121.128.0/17
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

Overlapping Ranges

BGP prefixes that contain 210.121.154.0/24

Range	ASN	Company	Num of IPs
210.121.128.0/17	AS38676	Korea Telecom	32,768
210.121.128.0/17	AS152290	Korea Telecom	32,768
210.121.128.0/17	AS18176	Korea Telecom	32,768
210.121.128.0/17	AS10058	Korea Telecom	32,768
210.121.128.0/17	AS55627	Korea Telecom	32,768
210.121.128.0/17	AS4766	Korea Telecom	32,768

Nearby Ranges

BGP prefixes that overlap with 210.121.0.0/16

Range	ASN	Company	Num of IPs
210.121.128.0/17	AS10058	Korea Telecom	32,768
210.121.128.0/17	AS152290	Korea Telecom	32,768
210.121.128.0/17	AS18176	Korea Telecom	32,768
210.121.128.0/17	AS38676	Korea Telecom	32,768
210.121.0.0/17	AS45374	SEJONG NETWORKS	32,768
210.121.128.0/17	AS4766	Korea Telecom	32,768
210.121.128.0/17	AS55627	Korea Telecom	32,768
210.121.0.0/17	AS9848	SEJONG NETWORKS	32,768

Hosted domains

There are no domains currently hosted on this ASN.

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

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

IP Address	ASN	Details
210.121.154.194	AS18176 KOOKMIN UNIVERSITY	`1.79ms` from Incheon, 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
198.142.77.72	AS4804 Microplex PTY LTD	`12.04ms` from Adelaide, AU
169.60.89.216	AS36351 IBM Cloud	`0.43ms` from Ashburn, US
71.229.17.232	AS7922 Comcast Cable Communications, LLC	`14.18ms` from Atlanta, US
62.167.88.232	AS6730 Sunrise GmbH	`1.47ms` from Geneve, CH
116.129.169.200	AS4837 CHINA UNICOM China169 Backbone	`13.81ms` from Kunming, CN
66.188.147.8	AS20115 Charter Communications LLC	`8.89ms` from Minneapolis, US
173.231.107.88	AS22652 Videotron Ltee	`0.42ms` from Montreal, CA
50.60.123.216	AS25019 Saudi Telecom Company JSC	`2.47ms` from Riyadh, SA
107.216.104.152	AS7018 AT&T Enterprises, LLC	`6.36ms` from San Antonio, US
24.209.134.152	AS10796 Charter Communications Inc	`7.28ms` from Chicago, US
73.8.53.40	AS7922 Comcast Cable Communications, LLC	`6.97ms` from Chicago, US
52.19.211.232	AS16509 Amazon.com, Inc.	`0.16ms` from Dublin, IE
103.230.188.8	AS133349 PT Jasa Utama Capital	`0.53ms` from Jakarta, ID
178.167.22.72	AS21453 Flex Ltd.	`2.45ms` from Moscow, RU
177.103.223.136	AS27699 TELEFÔNICA BRASIL S.A	`1.52ms` from Osasco, BR
1.140.165.168	AS1221 Telstra Limited	`1.74ms` from Perth, AU
34.190.29.56	AS19527 Google LLC	`0.14ms` from Seoul, KR
61.79.145.24	AS4766 Korea Telecom	`1.95ms` from Seoul, KR
118.32.23.136	AS4766 Korea Telecom	`1.73ms` from Seoul, KR
104.84.153.8	AS20940 Akamai International B.V.	`0.12ms` from Stockholm, SE
171.118.107.88	AS4837 CHINA UNICOM China169 Backbone	`2.56ms` from Taiyuan, CN
112.44.50.88	AS9808 China Mobile Communications Group Co., Ltd.	`8.76ms` from Chengdu, CN
99.80.107.8	AS16509 Amazon.com, Inc.	`0.16ms` from Dublin, IE
18.158.78.120	AS16509 Amazon.com, Inc.	`0.16ms` from Frankfurt am Main, DE
217.238.4.200	AS3320 Deutsche Telekom AG	`6.46ms` from Frankfurt am Main, DE

Traceroute

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

traceroute -a -n -q1 210.121.154.48

traceroute to 210.121.154.48 (210.121.154.48): 64 hops max, 52 byte packets

1 [AS31898] 140.91.214.5 0.073 ms

2 [AS3786] 211.118.152.142 0.791 ms

3 *

4 *

5 *

6 *

7 [AS3786] 115.89.206.242 2.453 ms

8 *

9 [AS18176] 210.121.154.48 2.422 ms

Measurement taken from

IPinfo ProbeNet in Seoul, KR

On January 10th 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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