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 AS23582 Korea Telecom 2,097,152
121.160.0.0/11 AS38089 Korea Telecom 2,097,152
121.160.0.0/11 AS4766 Korea Telecom 2,097,152
121.224.0.0/12 AS4134 CHINANET jiangsu province network 1,048,576
121.224.0.0/12 AS134770 CHINANET jiangsu province network 1,048,576
121.208.0.0/12 AS1221 Telstra Limited 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 AS137702 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
121.224.0.0/12 AS137697 CHINANET jiangsu province network 1,048,576
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
121.8.0.0/13 AS135089 CHINANET Guangdong province network 524,288
121.8.0.0/13 AS4134 CHINANET Guangdong province network 524,288
121.112.0.0/13 AS4713 NTT DOCOMO BUSINESS,Inc. 524,288
121.60.0.0/14 AS4134 CHINANET Hubei province network 262,144
121.80.0.0/14 AS17511 OPTAGE Inc. 262,144
121.32.0.0/14 AS4134 CHINANET Guangdong province network 262,144
121.64.0.0/14 AS23555 LG DACOM Corporation 262,144
121.84.0.0/14 AS17511 OPTAGE Inc. 262,144
121.204.0.0/14 AS4134 CHINANET Fujian province network 262,144
121.64.0.0/14 AS17598 LG DACOM Corporation 262,144
121.204.0.0/14 AS133774 CHINANET Fujian province network 262,144
121.60.0.0/14 AS148981 CHINANET Hubei province network 262,144
121.204.0.0/14 AS133776 CHINANET Fujian province network 262,144
121.40.0.0/14 AS37963 Aliyun Computing Co., LTD 262,144
121.204.0.0/14 AS133775 CHINANET Fujian province network 262,144
121.64.0.0/14 AS3786 LG DACOM Corporation 262,144
121.196.0.0/14 AS37963 Aliyun Computing Co., LTD 262,144
121.24.0.0/14 AS4837 China Unicom Hebei province network 262,144
121.248.0.0/14 AS4538 China Education and Research Network 262,144
121.64.0.0/14 AS17586 LG DACOM Corporation 262,144
121.76.0.0/15 AS9812 Oriental Cable Network Co., Ltd. 131,072
121.48.0.0/15 AS4538 China Education and Research Network 131,072
121.28.0.0/15 AS4837 China Unicom Hebei province network 131,072
121.96.0.0/15 AS6648 Bayan Telecommunications Incorporated 131,072
121.194.0.0/15 AS4538 China Education and Research Network 131,072
121.4.0.0/15 AS132203 Tencent cloud computing (Beijing) Co., Ltd. 131,072
121.124.0.0/15 AS9318 SK Broadband Co Ltd 131,072
121.98.0.0/15 AS9790 Two Degrees Mobile Limited 131,072
121.2.0.0/15 AS2527 Sony Network Communications Inc. 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
121.137.4.71 AS4766 Korea Telecom 1.41ms from Seoul, KR
121.137.114.142 AS4766 Korea Telecom 1.82ms from Seoul, KR
121.137.116.23 AS4766 Korea Telecom 1.62ms from Seoul, KR
121.137.84.120 AS4766 Korea Telecom 1.99ms from Seoul, KR
121.137.142.1 AS4766 Korea Telecom 1.84ms from Seoul, KR
121.137.126.120 AS4766 Korea Telecom 1.50ms from Seoul, KR
121.137.40.42 AS4766 Korea Telecom 1.99ms from Seoul, KR
121.137.113.69 AS4766 Korea Telecom 1.72ms from Seoul, KR
121.137.75.144 AS4766 Korea Telecom 1.91ms from Seoul, KR
121.137.144.1 AS4766 Korea Telecom 2.17ms from Seoul, KR
121.137.110.85 AS4766 Korea Telecom 1.71ms from Seoul, KR
121.136.225.198 AS4766 Korea Telecom 1.72ms from Seoul, KR
121.136.247.153 AS4766 Korea Telecom 2.07ms from Seoul, KR
121.137.112.67 AS4766 Korea Telecom 1.84ms from Seoul, KR
121.137.21.110 AS4766 Korea Telecom 1.56ms from Seoul, KR
121.136.231.122 AS4766 Korea Telecom 1.81ms from Seoul, KR
121.136.241.186 AS4766 Korea Telecom 1.91ms from Seoul, KR
121.137.167.94 AS4766 Korea Telecom 2.00ms from Seoul, KR
121.137.156.1 AS4766 Korea Telecom 1.88ms from Seoul, KR
121.136.227.190 AS4766 Korea Telecom 2.21ms from Seoul, KR
121.137.161.92 AS4766 Korea Telecom 4.58ms from Seoul, KR
121.137.3.145 AS4766 Korea Telecom 1.65ms from Seoul, KR
121.137.153.188 AS4766 Korea Telecom 1.49ms from Seoul, KR
121.136.239.73 AS4766 Korea Telecom 1.61ms from Seoul, KR
121.137.77.114 AS4766 Korea Telecom 2.06ms 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
77.171.154.43 AS1136 KPN B.V. 2.45ms from Amsterdam, NL
47.90.212.91 AS45102 Alibaba (US) Technology Co., Ltd. 0.39ms from Ashburn, US
109.131.156.59 AS5432 Proximus NV 1.75ms from Brussels, BE
73.144.108.155 AS7922 Comcast Cable Communications, LLC 7.61ms from Flint, US
182.190.142.251 AS17557 Pakistan Telecommunication Company Limited 9.56ms from Karachi, PK
15.216.69.75 AS16509 Amazon.com, Inc. 5.86ms from Madrid, ES
90.241.148.251 AS5378 Vodafone Limited 2.96ms from Manchester, GB
89.89.65.187 AS5410 Bouygues Telecom SA 7.71ms from Marseille, FR
151.95.63.91 AS1267 WIND TRE S.P.A. 14.79ms from Milan, IT
31.47.226.11 AS49435 INGATE GmbH 2.96ms from Nuernberg, DE
114.160.52.59 AS4713 NTT DOCOMO BUSINESS,Inc. 12.84ms from Osaka, JP
189.60.100.171 AS28573 Claro NXT Telecomunicacoes Ltda 5.33ms from Rio de Janeiro, BR
190.171.133.11 AS16629 CTC. CORP S.A. (TELEFONICA EMPRESAS) 1.18ms from Santiago, CL
220.121.173.91 AS4766 Korea Telecom 1.76ms from Seoul, KR
216.174.116.139 AS7057 Managed Network Systems Inc. 6.34ms from Toronto, CA
106.75.6.123 AS23724 IDC, China Telecommunications Corporation 2.30ms from Beijing, CN
84.47.99.75 AS6855 Slovak Telekom, a.s. 4.17ms from Bratislava, SK
38.154.19.139 AS174 Cogent Communications, LLC 0.19ms from Buffalo, US
218.16.117.139 AS134763 CHINANET Guangdong province network 3.64ms from Guangzhou, CN
14.244.156.11 AS45899 VNPT Corp 5.70ms from Hanoi, VN
82.122.96.75 AS3215 Orange S.A. 7.75ms from Marseille, FR
128.119.231.187 AS1249 University of Massachusetts - AMHERST 8.72ms from New York City, US
62.35.41.107 AS5410 Bouygues Telecom SA 4.04ms from Paris, FR
63.200.38.219 AS7018 AT&T Enterprises, LLC 1.57ms from San Jose, US
43.200.16.171 AS16509 Amazon.com, Inc. 0.32ms from Seoul, KR

Traceroute

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

$
traceroute -a -n -q1 121.159.128.1
traceroute to 121.159.128.1 (121.159.128.1): 64 hops max, 52 byte packets
2 *
3 *
4 *
5 *
6 [AS4766] 121.159.128.1 5.276 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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