210.121.156.0/24

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 210.121.156.0/24

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

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

IP Address	ASN	Details
210.121.156.98	AS18176 KOOKMIN UNIVERSITY	`1.72ms` 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
71.163.158.24	AS701 Verizon Business	`2.12ms` from Ashburn, US
149.75.253.24	AS6079 RCN	`8.07ms` from Chicago, US
124.51.31.120	AS17858 LG POWERCOMM	`2.34ms` from Incheon, KR
72.27.219.88	AS30689 FLOW	`4.97ms` from Kingston, JM
67.246.38.120	AS11351 Charter Communications Inc	`11.94ms` from New York City, US
1.219.178.8	AS3786 LG DACOM Corporation	`1.69ms` from Seoul, KR
180.159.23.184	AS4812 China Telecom (Group)	`4.19ms` from Shanghai, CN
216.213.67.200	AS6580 Golden West Telecommunications Coop., Inc.	`1.56ms` from Sioux Falls, US
94.145.211.136	AS9158 Telenor A/S	`3.88ms` from Skanderborg, DK
45.62.184.120	AS13150 CATO NETWORKS LTD	`0.13ms` from Ashburn, US
220.194.14.88	AS4808 China Unicom Beijing Province Network	`2.56ms` from Beijing, CN
152.232.132.200	AS55286 B2 Net Solutions Inc.	`0.24ms` from Buffalo, US
206.197.226.232	AS55154 Madgenius.com	`1.05ms` from Chicago, US
181.218.204.8	AS28573 Claro NXT Telecomunicacoes Ltda	`2.68ms` from Curitiba, BR
192.146.240.8	AS394720 Alamo Community College District	`8.97ms` from Dallas, US
52.211.163.120	AS16509 Amazon.com, Inc.	`0.21ms` from Dublin, IE
93.255.243.200	AS3320 Deutsche Telekom AG	`15.62ms` from Frankfurt am Main, DE
217.93.212.184	AS3320 Deutsche Telekom AG	`4.86ms` from Frankfurt am Main, DE
78.137.210.136	AS12353 Vodafone Portugal	`0.74ms` from Lisbon, PT
172.91.40.8	AS20001 Charter Communications Inc	`4.88ms` from Los Angeles, US
13.76.41.136	AS8075 Microsoft Corporation	`0.57ms` from Singapore, SG
210.141.114.56	AS2516 KDDI CORPORATION	`2.16ms` from Tokyo, JP
201.127.201.232	AS8151 UNINET	`8.02ms` from Tucson, US
71.69.120.136	AS11426 Charter Communications Inc	`8.74ms` from Charlotte, US
84.142.89.136	AS3320 Deutsche Telekom AG	`7.68ms` 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 210.121.156.72

traceroute to 210.121.156.72 (210.121.156.72): 64 hops max, 52 byte packets

1 [AS31898] 140.91.214.44 0.089 ms

2 [AS3786] 211.118.152.142 0.722 ms

3 *

4 *

5 *

6 *

7 [AS3786] 115.89.206.242 2.916 ms

8 *

9 [AS18176] 210.121.156.72 2.799 ms

Measurement taken from

IPinfo ProbeNet in Seoul, KR

On January 19th 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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