All IP Ranges
121.0.0.0/8
AS4766 | 121.128.0.0/11

121.128.0.0/11

AS4766 · Korea Telecom

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Summary

Country	South Korea
Domain	kt.com
ASN	AS4766
Registry	APNIC
ID	KORNET

WHOIS Details

inetnum:        121.128.0.0 - 121.159.255.255
netname:        KORNET
descr:          Korea Telecom
admin-c:        IM667-AP
tech-c:         IM667-AP
country:        KR
status:         ALLOCATED PORTABLE
mnt-by:         MNT-KRNIC-AP
mnt-irt:        IRT-KRNIC-KR
changed:        hostmaster@nic.or.kr 20170203
source:         APNIC

irt:            IRT-KRNIC-KR
address:        Seoul Songpa-gu Jungdae-ro 135
e-mail:         hostmaster@nic.or.kr
abuse-mailbox:  hostmaster@nic.or.kr
admin-c:        IM574-AP
tech-c:         IM574-AP
auth:           # Filtered
mnt-by:         MNT-KRNIC-AP
changed:        hostmaster@nic.or.kr 20150513
source:         APNIC

person:         IP Manager
address:        Gyeonggi-do Bundang-gu, Seongnam-si Buljeong-ro 90
country:        KR
phone:          +82-2-500-6630
e-mail:         kornet_ip@kt.com
nic-hdl:        IM667-AP
mnt-by:         MNT-KRNIC-AP
changed:        hostmaster@nic.or.kr 20170328
source:         APNIC

inetnum:        121.128.0.0 - 121.159.255.255
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
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.krnic.net.
changed:        hostmaster@nic.or.kr
source:         KRNIC

person:         IP Manager
address:        Gyeonggi-do Bundang-gu, Seongnam-si Buljeong-ro 90
address:        
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
source:         KRNIC

person:         IP Manager
address:        Gyeonggi-do Bundang-gu, Seongnam-si Buljeong-ro 90
address:        
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
source:         KRNIC

Hosted domains

There are 6,275 domain names hosted across 1,866 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address	Domain	Domains on this IP
121.152.79.226	physia.kr	63
121.152.44.151	hdhoistcrane.com	57
121.152.44.155	pszoon.com	54
121.152.44.143	xn--hy1bl89bild10c.kr	45
121.152.44.159	yjjobs.co.kr	45
121.152.44.160	ymarathon.com	44
121.152.44.165	daun21.com	44
121.152.44.153	seoinind.net	36
121.152.44.156	chammedical.kr	29
121.152.44.206	poptoon.net	28
121.152.44.168	changwongong.com	28
121.152.44.201	jinjuryu.com	24
121.152.44.173	mitory.com	22
121.152.44.175	yamada-eng.co.jp	19
121.152.44.207	bsnit.co.kr	19
121.152.44.210	obd2.co.kr	18
121.152.44.167	sejongmedia.co.kr	18
121.152.44.184	kahrd.or.kr	18
121.149.115.222	samhakgps.com	17
121.148.190.228	epos.kr	15

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

1,159,766 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address	ASN	Details
121.128.8.25	AS4766 Korea Telecom	`1.12ms` from Seoul, KR
121.128.9.203	AS4766 Korea Telecom	`1.04ms` from Seoul, KR
121.128.1.126	AS4766 Korea Telecom	`0.96ms` from Seoul, KR
121.128.5.254	AS4766 Korea Telecom	`1.36ms` from Seoul, KR
121.128.4.231	AS4766 Korea Telecom	`0.93ms` from Seoul, KR
121.128.17.177	AS4766 Korea Telecom	`1.02ms` from Seoul, KR
121.128.0.131	AS4766 Korea Telecom	`0.94ms` from Seoul, KR
121.128.10.31	AS4766 Korea Telecom	`1.29ms` from Seoul, KR
121.128.6.74	AS4766 Korea Telecom	`1.21ms` from Seoul, KR
121.128.3.75	AS4766 Korea Telecom	`1.17ms` from Seoul, KR
121.128.7.254	AS4766 Korea Telecom	`1.19ms` from Seoul, KR
121.128.2.123	AS4766 Korea Telecom	`1.41ms` from Seoul, KR
121.128.137.243	AS4766 Korea Telecom	`1.23ms` from Seoul, KR
121.128.37.21	AS4766 Korea Telecom	`1.30ms` from Seoul, KR
121.128.228.37	AS4766 Korea Telecom	`0.97ms` from Seoul, KR
121.129.44.254	AS4766 Korea Telecom	`1.22ms` from Seoul, KR
121.128.162.97	AS4766 Korea Telecom	`1.18ms` from Seoul, KR
121.128.146.129	AS4766 Korea Telecom	`1.17ms` from Seoul, KR
121.128.226.135	AS4766 Korea Telecom	`1.24ms` from Seoul, KR
121.128.153.212	AS4766 Korea Telecom	`1.18ms` from Seoul, KR
121.128.42.30	AS4766 Korea Telecom	`0.96ms` from Seoul, KR
121.128.174.254	AS4766 Korea Telecom	`1.15ms` from Seoul, KR
121.128.205.141	AS4766 Korea Telecom	`0.91ms` from Seoul, KR
121.128.65.34	AS4766 Korea Telecom	`1.26ms` from Seoul, KR
121.128.234.254	AS4766 Korea Telecom	`1.17ms` 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
24.2.224.155	AS7922 Comcast Cable Communications, LLC	`9.72ms` from Boston, US
113.164.189.59	AS45899 VNPT Corp	`3.11ms` from Hanoi, VN
14.175.7.139	AS45899 VNPT Corp	`2.82ms` from Hanoi, VN
41.76.20.43	AS37057 Vodacom Lesotho (Pty) Ltd	`11.08ms` from Johannesburg, ZA
89.97.205.59	AS12874 Fastweb SpA	`2.06ms` from Milan, IT
92.119.230.219	AS208626 ServTech LTD	`0.89ms` from Moscow, RU
98.7.61.219	AS12271 Charter Communications Inc	`4.65ms` from New York City, US
201.110.165.139	AS8151 UNINET	`3.50ms` from Santiago de Queretaro, MX
180.231.15.219	AS17858 LG POWERCOMM	`4.07ms` from Seoul, KR
112.182.179.187	AS4766 Korea Telecom	`4.07ms` from Seoul, KR
118.56.79.27	AS4766 Korea Telecom	`6.88ms` from Seoul, KR
45.144.155.171	AS9028 OHOST LLC	`0.42ms` from Sofia, BG
126.147.73.59	AS17676 SoftBank Corp.	`2.99ms` from Tokyo, JP
204.101.119.91	AS577 Bell Canada	`1.03ms` from Toronto, CA
197.6.27.75	AS327934 SOCIETE NATIONALE DES TELECOMMUNICATIONS (Tunisie Telecom)	`12.34ms` from Tunis, TN
222.138.61.219	AS4837 CHINA UNICOM China169 Backbone	`3.40ms` from Zhengzhou, CN
77.166.223.59	AS1136 KPN B.V.	`2.25ms` from Amsterdam, NL
2.204.226.123	AS3209 Vodafone GmbH	`2.76ms` from Berlin, DE
141.22.166.11	AS680 Verein zur Foerderung eines Deutschen Forschungsnetzes e.V.	`7.86ms` from Berlin, DE
67.238.119.251	AS26396 MidwayNet, LLC.	`9.93ms` from Chicago, US
98.253.54.155	AS7922 Comcast Cable Communications, LLC	`11.92ms` from Chicago, US
91.16.142.171	AS3320 Deutsche Telekom AG	`4.45ms` from Frankfurt am Main, DE
221.127.93.139	AS9304 HGC Global Communications Limited	`1.27ms` from Hong Kong, HK
41.30.77.107	AS29975 Vodacom	`11.59ms` from Johannesburg, ZA
108.181.1.155	AS40676 Psychz Networks	`0.13ms` from Los Angeles, US

Traceroute

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

traceroute -a -n -q1 -f4 121.132.14.234

traceroute to 121.132.14.234 (121.132.14.234): 64 hops max, 52 byte packets

4 [AS5483] 145.236.89.248 0.998 ms

5 [AS3320] 62.159.61.98 4.283 ms

6 [AS4766] 121.132.14.234 295.677 ms

Measurement taken from

IPinfo ProbeNet in Budapest, HU

On September 4th 2025

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.

Traffic works its way around the internet based on the routing table, which contains a list of networks and their associated netblocks.

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