1. All IP Ranges
  2. 121.0.0.0/8
  3. 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:        [email protected] 20170203
source:         APNIC

irt:            IRT-KRNIC-KR
address:        Seoul Songpa-gu Jungdae-ro 135
e-mail:         [email protected]
abuse-mailbox:  [email protected]
admin-c:        IM574-AP
tech-c:         IM574-AP
auth:           # Filtered
mnt-by:         MNT-KRNIC-AP
changed:        [email protected] 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:         [email protected]
nic-hdl:        IM667-AP
mnt-by:         MNT-KRNIC-AP
changed:        [email protected] 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:        [email protected]
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:         [email protected]
nic-hdl:        IA9-KR
mnt-by:         MNT-KRNIC-AP
changed:        [email protected]
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:         [email protected]
nic-hdl:        IM9-KR
mnt-by:         MNT-KRNIC-AP
changed:        [email protected]
source:         KRNIC

Overlapping Ranges

BGP prefixes that are contained by 121.128.0.0/11

Range ASN Company Num of IPs
121.151.96.0/24 AS131792 Korea Telecom 256
121.128.97.0/24 AS152214 Korea Telecom 256
121.131.216.0/24 AS152214 Korea Telecom 256
121.144.249.0/24 AS18023 Haeyangdaehakgyo 256
121.144.250.0/24 AS18023 Haeyangdaehakgyo 256
121.139.137.0/24 AS3786 Eseuaitissi jusikhoesa 256
121.131.145.0/24 AS38126 (ju)koseu 256
121.133.198.0/24 AS38394 Korea Telecom 256
121.133.199.0/24 AS38395 Korea Telecom 256
121.133.203.0/24 AS38399 Korea Telecom 256
121.133.209.0/24 AS38412 Korea Telecom 256
121.135.53.0/24 AS38697 Hangyeongdaehakgyo 256
121.135.54.0/24 AS38697 Hangyeongdaehakgyo 256
121.135.55.0/24 AS38697 Hangyeongdaehakgyo 256
121.135.56.0/24 AS38697 Hangyeongdaehakgyo 256
121.135.147.0/24 AS46002 (ju)pyeonghwaijeu 256
121.135.148.0/24 AS46002 (ju)pyeonghwaijeu 256
121.137.151.0/24 AS4766 Bindaehakgyo 256
121.137.185.0/24 AS4766 Hangyeongdaehakgyo 256
121.150.39.0/24 AS4766 Gyeongbukdaehakgyo 256
121.156.150.0/24 AS4766 Hangukgyotongdaehakgyo 256
121.156.153.0/24 AS4766 Hangukgyotongdaehakgyo 256
121.159.242.0/24 AS4766 KT 256
121.159.243.0/24 AS4766 KT 256
121.140.76.0/24 AS9524 Korea Telecom 256
121.141.229.0/24 AS9526 (ju)koseu 256
121.141.60.0/24 AS9526 (ju)koseu 256
121.140.97.0/24 AS9530 (ju) sinsegyeaissi 256
121.157.108.0/24 AS9638 Korea Telecom 256
121.157.110.0/24 AS9638 Korea Telecom 256
121.157.111.0/24 AS9638 Korea Telecom 256
121.128.219.0/24 AS9647 Korea Telecom 256
121.135.246.0/24 AS9696 Korea Telecom 256
121.129.49.0/24 AS9776 (ju)gukmineunhaengbonjeom 256
121.141.101.0/24 AS9776 (ju)ibigukmindeu 256
121.144.148.0/24 AS9870 Donguidaehakgyo 256
121.144.149.0/24 AS9870 Donguidaehakgyo 256

Nearby Ranges

BGP prefixes that overlap with 121.0.0.0/8

Range ASN Company Num of IPs
121.160.0.0/11 AS38089 Korea Telecom 2,097,152
121.160.0.0/11 AS4766 Korea Telecom 2,097,152
121.160.0.0/11 AS23582 Korea Telecom 2,097,152
121.224.0.0/12 AS4134 CHINANET jiangsu province network 1,048,576
121.208.0.0/12 AS1221 Telstra Limited 1,048,576
121.224.0.0/12 AS137697 CHINANET jiangsu province network 1,048,576
121.224.0.0/12 AS137702 CHINANET jiangsu province network 1,048,576
121.224.0.0/12 AS134770 CHINANET jiangsu province network 1,048,576
121.224.0.0/12 AS140292 CHINANET jiangsu province network 1,048,576
121.224.0.0/12 AS137699 CHINANET jiangsu province network 1,048,576
121.224.0.0/12 AS134756 CHINANET jiangsu province network 1,048,576
121.224.0.0/12 AS146966 CHINANET jiangsu province network 1,048,576
121.8.0.0/13 AS135089 CHINANET Guangdong province network 524,288
121.8.0.0/13 AS136199 CHINANET Guangdong province network 524,288
121.8.0.0/13 AS140308 CHINANET Guangdong province network 524,288
121.16.0.0/13 AS4837 China Unicom Hebei province network 524,288
121.112.0.0/13 AS4713 NTT DOCOMO BUSINESS,Inc. 524,288
121.8.0.0/13 AS4134 CHINANET Guangdong province network 524,288
121.40.0.0/14 AS37963 Aliyun Computing Co., LTD 262,144
121.64.0.0/14 AS23555 LG DACOM Corporation 262,144
121.204.0.0/14 AS4134 CHINANET Fujian province network 262,144
121.64.0.0/14 AS3786 LG DACOM Corporation 262,144
121.60.0.0/14 AS4134 CHINANET Hubei province network 262,144
121.196.0.0/14 AS37963 Aliyun Computing Co., LTD 262,144
121.32.0.0/14 AS4134 CHINANET Guangdong province network 262,144
121.64.0.0/14 AS17598 LG DACOM Corporation 262,144
121.64.0.0/14 AS17586 LG DACOM Corporation 262,144
121.248.0.0/14 AS4538 China Education and Research Network 262,144
121.24.0.0/14 AS4837 China Unicom Hebei province network 262,144
121.80.0.0/14 AS17511 OPTAGE Inc. 262,144
121.204.0.0/14 AS133774 CHINANET Fujian province network 262,144
121.204.0.0/14 AS133776 CHINANET Fujian province network 262,144
121.84.0.0/14 AS17511 OPTAGE Inc. 262,144
121.204.0.0/14 AS133775 CHINANET Fujian province network 262,144
121.60.0.0/14 AS148981 CHINANET Hubei province network 262,144
121.194.0.0/15 AS4538 China Education and Research Network 131,072
121.96.0.0/15 AS6648 Bayan Telecommunications Incorporated 131,072
121.28.0.0/15 AS4837 China Unicom Hebei province network 131,072
121.48.0.0/15 AS4538 China Education and Research Network 131,072
121.4.0.0/15 AS132203 Tencent cloud computing (Beijing) Co., Ltd. 131,072
121.76.0.0/15 AS9812 Oriental Cable Network Co., Ltd. 131,072
121.44.0.0/15 AS4739 iiNet Limited 131,072
121.2.0.0/15 AS2527 Sony Network Communications Inc. 131,072
121.124.0.0/15 AS9318 SK Broadband Co Ltd 131,072

Hosted domains

There are 5,760 domain names hosted across 1,918 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address Domain Domains on this IP
121.152.44.120 nanu.or.kr 310
121.143.79.109 mignon.kr 286
121.140.43.236 koreainstrument.co.kr 149
121.152.44.147 jeilchem.co.kr 67
121.152.79.226 bmw-award2025.com 54
121.152.44.143 jmsgolf.co.kr 45
121.152.44.179 gugihani.com 45
121.152.44.159 wonjinmc.com 45
121.132.110.166 xn--9d0bw1i27dlb858abf947e1tb006d.com 41
121.152.44.152 tyronkorea.com 37
121.152.44.158 daeildrive.co.kr 37
121.136.95.149 xn--392b25b2weba591v.com 36
121.152.44.153 jobala.co.kr 36
121.152.44.171 unuclinic.com 33
121.152.44.156 chammedical.kr 29
121.156.65.161 ass.or.kr 26
121.152.44.144 pmots.co.kr 26
121.152.44.178 andongoctopus.com 23
121.152.44.201 hkgntec.com 23
121.152.44.173 pension-bluesky.com 22

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

1,176,491 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address ASN Details
121.128.97.14 AS152214 Korean Air Lines 1.37ms from Seoul, KR
121.128.184.126 AS4766 Korea Telecom 1.08ms from Seoul, KR
121.128.84.19 AS4766 Korea Telecom 1.29ms from Seoul, KR
121.128.232.222 AS4766 Korea Telecom 1.03ms from Seoul, KR
121.128.63.30 AS4766 Korea Telecom 1.29ms from Seoul, KR
121.128.182.157 AS4766 Korea Telecom 1.17ms from Seoul, KR
121.128.189.228 AS4766 Korea Telecom 1.28ms from Seoul, KR
121.128.227.131 AS4766 Korea Telecom 1.17ms from Seoul, KR
121.128.106.164 AS4766 Korea Telecom 1.30ms from Seoul, KR
121.128.132.217 AS4766 Korea Telecom 1.44ms from Seoul, KR
121.128.198.254 AS4766 Korea Telecom 1.22ms from Seoul, KR
121.128.118.5 AS4766 Korea Telecom 1.21ms from Seoul, KR
121.128.42.36 AS4766 Korea Telecom 1.23ms from Seoul, KR
121.128.2.254 AS4766 Korea Telecom 1.49ms from Seoul, KR
121.128.159.107 AS4766 Korea Telecom 1.25ms from Seoul, KR
121.128.148.139 AS4766 Korea Telecom 1.19ms from Seoul, KR
121.128.129.6 AS4766 Korea Telecom 1.16ms from Seoul, KR
121.128.76.98 AS4766 Korea Telecom 1.02ms from Seoul, KR
121.128.136.254 AS4766 Korea Telecom 1.21ms from Seoul, KR
121.128.66.49 AS4766 Korea Telecom 1.27ms from Seoul, KR
121.128.207.254 AS4766 Korea Telecom 1.44ms from Seoul, KR
121.128.137.85 AS4766 Korea Telecom 1.48ms from Seoul, KR
121.128.8.254 AS4766 Korea Telecom 1.29ms from Seoul, KR
121.128.224.134 AS38122 Seoul Guarantee Insurance Company 2.91ms from Seoul, KR
121.128.65.55 AS4766 Korea Telecom 1.25ms 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
72.109.151.123 AS6167 Verizon Business 13.66ms from Atlanta, US
44.242.173.251 AS16509 Amazon.com, Inc. 0.53ms from Boardman, US
84.47.99.75 AS6855 Slovak Telekom, a.s. 4.17ms from Bratislava, SK
74.141.67.43 AS10796 Charter Communications Inc 14.98ms from Columbus, US
47.70.19.219 AS3209 Vodafone GmbH 17.89ms from Duesseldorf, DE
3.75.58.59 AS16509 Amazon.com, Inc. 0.17ms from Frankfurt am Main, DE
180.95.222.123 AS4837 CHINA UNICOM China169 Backbone 9.13ms from Lanzhou, CN
91.243.233.203 AS47531 GorPTUs OOO 14.04ms from Moscow, RU
80.181.48.171 AS3269 Telecom Italia S.p.A. 5.07ms from Naples, IT
37.22.50.171 AS12389 PJSC Rostelecom 6.89ms from Novosibirsk, RU
141.101.59.59 AS34177 CELESTE SAS 7.28ms from Paris, FR
39.90.47.59 AS4837 CHINA UNICOM China169 Backbone 9.13ms from Qingdao, CN
44.192.200.139 AS14618 Amazon.com, Inc. 0.21ms from Reston, US
189.60.100.171 AS28573 Claro NXT Telecomunicacoes Ltda 5.33ms from Rio de Janeiro, BR
187.146.55.27 AS8151 UNINET 8.37ms from Santiago de Queretaro, MX
14.55.141.155 AS4766 Korea Telecom 4.87ms from Seoul, KR
203.72.188.187 AS1659 Taiwan Academic Network (TANet) Information Center 2.55ms from Taipei, TW
61.134.233.107 AS4837 CHINA UNICOM China169 Backbone 2.95ms from Taiyuan, CN
162.95.222.11 AS22703 Elevance Health, Inc. 3.66ms from Ashburn, US
181.69.209.171 AS27831 Colombia Móvil 19.56ms from Bogota, CO
172.111.219.43 AS9009 M247 Europe SRL 0.59ms from Chicago, US
65.103.244.43 AS209 CenturyLink Communications, LLC 4.12ms from Draper, US
102.115.35.123 AS23889 Mauritius Telecom Ltd 4.34ms from Ebene, MU
102.164.30.139 AS328341 Capricom Networks 3.85ms from Johannesburg, ZA
41.76.20.43 AS37057 Vodacom Lesotho (Pty) Ltd 12.08ms from Johannesburg, ZA

Traceroute

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

$
traceroute -a -n -q1 -f5 121.135.78.19
traceroute to 121.135.78.19 (121.135.78.19): 64 hops max, 52 byte packets
5 [AS4766] 112.174.58.46 2.317 ms
6 *
8 [AS4766] 121.135.78.19 2.832 ms
Measurement taken from IPinfo ProbeNet in Seoul, KR
On

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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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