210.121.157.0/24

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 210.121.157.0/24

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

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

IP Address	ASN	Details
210.121.157.0	AS18176 KOOKMIN UNIVERSITY	`1.81ms` 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
52.39.251.40	AS16509 Amazon.com, Inc.	`0.12ms` from Boardman, US
52.118.183.104	AS36351 IBM Cloud	`0.84ms` from Dallas, US
117.247.170.248	AS9829 National Internet Backbone	`4.45ms` from Delhi, IN
92.134.38.8	AS3215 Orange S.A.	`9.95ms` from Frankfurt am Main, DE
111.123.209.24	AS4134 CHINANET-BACKBONE	`8.52ms` from Guiyang, CN
212.161.56.8	AS8220 COLT Technology Services Group Limited	`0.81ms` from London, GB
200.232.30.200	AS10429 TELEFÔNICA BRASIL S.A	`1.60ms` from Osasco, BR
209.8.50.200	AS55034 IGG.COM	`0.28ms` from San Jose, US
73.189.48.72	AS7922 Comcast Cable Communications, LLC	`3.30ms` from San Jose, US
121.107.77.232	AS2516 KDDI CORPORATION	`8.14ms` from Tokyo, JP
172.192.5.88	AS8075 Microsoft Corporation	`0.16ms` from Tokyo, JP
50.112.135.40	AS16509 Amazon.com, Inc.	`0.10ms` from Boardman, US
91.61.121.104	AS3320 Deutsche Telekom AG	`6.01ms` from Frankfurt am Main, DE
23.247.242.120	AS896 Fortlab	`0.34ms` from Frankfurt am Main, DE
171.224.239.248	AS7552 Viettel Group	`2.70ms` from Hanoi, VN
210.17.218.152	AS9381 HKBN Enterprise Solutions HK Limited	`2.13ms` from Hong Kong, HK
39.51.6.136	AS17557 Pakistan Telecommunication Company Limited	`4.70ms` from Karachi, PK
162.221.167.232	AS7224 Amazon.com, Inc.	`0.55ms` from London, GB
80.3.45.24	AS5089 Virgin Media Limited	`7.31ms` from Maidenhead, GB
80.76.185.56	AS34629 "Resurs-Svyaz" Ltd	`5.49ms` from Moscow, RU
193.203.191.40	AS47583 Hostinger International Limited	`0.53ms` from Paris, FR
187.136.12.72	AS8151 UNINET	`17.43ms` from Santiago de Queretaro, MX
187.169.158.8	AS8151 UNINET	`3.92ms` from Santiago de Queretaro, MX
201.93.195.248	AS27699 TELEFÔNICA BRASIL S.A	`3.24ms` from São Paulo, BR
16.63.43.200	AS16509 Amazon.com, Inc.	`0.33ms` from Zuerich, CH

Traceroute

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

traceroute -a -n -q1 -f7 210.121.157.231

traceroute to 210.121.157.231 (210.121.157.231): 64 hops max, 52 byte packets

7 [AS3786] 1.208.178.70 2.689 ms

8 *

9 [AS3786] 115.89.206.242 2.05 ms

10 *

11 *

12 [AS18176] 210.121.157.231 2.062 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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