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  2. 121.0.0.0/8
  3. AS4766  | 121.128.0.0/12

121.128.0.0/12

AS4766  ·  Korea Telecom

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Summary

Country South Korea
Domain kt.com
ASN AS4766
Parent Range 121.128.0.0/11
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

Overlapping Ranges

BGP prefixes that contain 121.128.0.0/12

Range ASN Company Num of IPs
121.128.0.0/11 AS17588 Korea Telecom 2,097,152
121.128.0.0/11 AS18333 Korea Telecom 2,097,152
121.128.0.0/11 AS4766 Korea Telecom 2,097,152
121.128.0.0/11 AS38122 Korea Telecom 2,097,152
121.128.0.0/11 AS9647 Korea Telecom 2,097,152
121.128.0.0/11 AS9856 Korea Telecom 2,097,152

BGP prefixes that are contained by 121.128.0.0/12

Range ASN Company Num of IPs
121.128.97.0/24 AS152214 Korea Telecom 256
121.131.216.0/24 AS152214 Korea Telecom 256
121.141.60.0/24 AS9526 (ju)koseu 256
121.140.97.0/24 AS9530 (ju) sinsegyeaissi 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
121.139.137.0/24 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
121.140.76.0/24 AS9524 Korea Telecom 256
121.141.229.0/24 AS9526 (ju)koseu 256

Nearby Ranges

BGP prefixes that overlap with 121.0.0.0/8

Range ASN Company Num of IPs
121.128.0.0/11 AS17588 Korea Telecom 2,097,152
121.160.0.0/11 AS38089 Korea Telecom 2,097,152
121.128.0.0/11 AS38122 Korea Telecom 2,097,152
121.128.0.0/11 AS4766 Korea Telecom 2,097,152
121.128.0.0/11 AS9647 Korea Telecom 2,097,152
121.160.0.0/11 AS4766 Korea Telecom 2,097,152
121.128.0.0/11 AS9856 Korea Telecom 2,097,152
121.160.0.0/11 AS23582 Korea Telecom 2,097,152
121.128.0.0/11 AS18333 Korea Telecom 2,097,152
121.224.0.0/12 AS4134 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 AS134756 CHINANET jiangsu province network 1,048,576
121.224.0.0/12 AS137697 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 AS137699 CHINANET jiangsu province network 1,048,576
121.208.0.0/12 AS1221 Telstra Limited 1,048,576
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 AS140308 CHINANET Guangdong province network 524,288
121.8.0.0/13 AS136199 CHINANET Guangdong 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
121.32.0.0/14 AS4134 CHINANET Guangdong 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
121.64.0.0/14 AS23555 LG DACOM Corporation 262,144
121.204.0.0/14 AS4134 CHINANET Fujian province network 262,144
121.204.0.0/14 AS133776 CHINANET Fujian province network 262,144
121.64.0.0/14 AS17598 LG DACOM Corporation 262,144
121.24.0.0/14 AS4837 China Unicom Hebei 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
121.80.0.0/14 AS17511 OPTAGE Inc. 262,144
121.248.0.0/14 AS4538 China Education and Research Network 262,144
121.84.0.0/14 AS17511 OPTAGE Inc. 262,144
121.64.0.0/14 AS17586 LG DACOM Corporation 262,144
121.196.0.0/14 AS37963 Aliyun Computing Co., LTD 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
121.98.0.0/15 AS9790 Two Degrees Mobile 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
121.44.0.0/15 AS7545 iiNet Limited 131,072
121.4.0.0/15 AS45090 Tencent cloud computing (Beijing) Co., Ltd. 131,072
121.4.0.0/15 AS132203 Tencent cloud computing (Beijing) Co., Ltd. 131,072
121.44.0.0/15 AS4739 iiNet Limited 131,072
121.194.0.0/15 AS4538 China Education and Research Network 131,072
121.28.0.0/15 AS4837 China Unicom Hebei province network 131,072

Hosted domains

There are 2,596 domain names hosted across 1,200 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address Domain Domains on this IP
121.132.110.166 kdjpeace.com 40
121.133.156.11 woorifundservices.co 15
121.138.248.35 passover.cn 13
121.135.203.111 no-mesh-hernia.com 13
121.138.248.148 africawmscog.com 11
121.134.74.70 cmsmobile.kr 7
121.129.5.54 lukemcqueen.com 7
121.133.85.162 ieulhealthcare.com 6
121.131.26.52 4t.gg 6
121.136.95.140 n-telecom.kr 6
121.129.166.41 apink.kr 5
121.142.24.171 corebarcode.net 5
121.128.176.35 1898.kr 4
121.142.84.243 jlvv.kr 4
121.137.47.174 ivycs.ai 4
121.128.176.32 catholic.or.kr 4
121.134.248.148 darwinai.ai 4
121.138.188.104 capital-m.co.kr 3
121.129.147.242 summernight.shop 3
121.128.58.230 leevelop.com 3

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

559,529 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address ASN Details
121.136.42.38 AS4766 Korea Telecom 1.46ms from Seoul, KR
121.136.86.13 AS4766 Korea Telecom 1.41ms from Seoul, KR
121.136.64.141 AS4766 Korea Telecom 1.74ms from Seoul, KR
121.135.178.222 AS4766 Korea Telecom 1.08ms from Seoul, KR
121.135.171.27 AS4766 Korea Telecom 1.40ms from Seoul, KR
121.136.93.231 AS4766 Korea Telecom 1.48ms from Seoul, KR
121.135.228.247 AS4766 Korea Telecom 1.37ms from Seoul, KR
121.136.6.154 AS4766 Korea Telecom 1.55ms from Seoul, KR
121.135.194.95 AS4766 Korea Telecom 1.08ms from Seoul, KR
121.136.71.150 AS4766 Korea Telecom 1.50ms from Seoul, KR
121.136.7.216 AS4766 Korea Telecom 1.30ms from Seoul, KR
121.136.95.67 AS4766 Korea Telecom 1.48ms from Seoul, KR
121.136.78.1 AS4766 Korea Telecom 1.75ms from Seoul, KR
121.136.113.249 AS4766 Korea Telecom 2.04ms from Seoul, KR
121.136.28.225 AS4766 Korea Telecom 1.76ms from Seoul, KR
121.136.24.244 AS4766 Korea Telecom 2.04ms from Seoul, KR
121.136.84.171 AS4766 Korea Telecom 1.29ms from Seoul, KR
121.135.217.12 AS4766 Korea Telecom 1.33ms from Seoul, KR
121.136.9.32 AS4766 Korea Telecom 1.58ms from Seoul, KR
121.136.130.97 AS4766 Korea Telecom 1.42ms from Seoul, KR
121.136.8.126 AS4766 Korea Telecom 1.24ms from Seoul, KR
121.136.122.206 AS4766 Korea Telecom 1.91ms from Seoul, KR
121.135.239.55 AS4766 Korea Telecom 1.46ms from Seoul, KR
121.136.109.1 AS4766 Korea Telecom 1.64ms from Seoul, KR
121.136.21.205 AS4766 Korea Telecom 1.64ms 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
157.93.249.252 AS4597 Millipore Corp. 4.23ms from Boston, US
93.116.228.124 AS8926 Moldtelecom SA 2.74ms from Chisinau, MD
35.157.39.60 AS16509 Amazon.com, Inc. 0.18ms from Frankfurt am Main, DE
123.1.229.28 AS10103 HK Broadband Network Ltd. 0.72ms from Hong Kong, HK
86.30.19.236 AS5089 Virgin Media Limited 10.40ms from London, GB
154.12.250.60 AS40021 Contabo Inc. 0.74ms from New York City, US
212.164.15.220 AS12389 PJSC Rostelecom 0.89ms from Novosibirsk, RU
217.108.187.124 AS3215 Orange S.A. 15.63ms from Paris, FR
32.211.166.252 AS46690 Southern New England Telephone Company and SNET America, Inc. 9.85ms from Secaucus, US
118.41.90.252 AS4766 Korea Telecom 6.53ms from Seoul, KR
203.165.13.140 AS9824 JCOM Co., Ltd. 1.24ms from Tokyo, JP
212.186.204.44 AS8412 T-Mobile Austria GmbH 1.18ms from Vienna, AT
83.6.76.156 AS5617 Orange Polska Spolka Akcyjna 7.07ms from Warsaw, PL
203.114.100.204 AS23969 TOT Public Company Limited 0.39ms from Bangkok, TH
3.32.128.188 AS8987 Amazon Data Services Ireland Ltd 0.32ms from Boardman, US
18.220.249.204 AS16509 Amazon.com, Inc. 0.19ms from Columbus, US
201.47.4.124 AS18881 TELEFÔNICA BRASIL S.A 2.27ms from Curitiba, BR
122.174.148.252 AS24560 Bharti Airtel Ltd., Telemedia Services 1.88ms from Hyderabad, IN
83.203.35.60 AS3215 Orange S.A. 3.56ms from Le Lamentin, MQ
124.95.121.76 AS4837 CHINA UNICOM China169 Backbone 9.88ms from Liaoyang, CN
35.176.18.252 AS16509 Amazon.com, Inc. 0.15ms from London, GB
5.77.36.188 AS20860 IOMART CLOUD SERVICES LIMITED 3.52ms from London, GB
95.172.15.204 AS34920 Simply Romford 1.81ms from London, GB
88.122.5.76 AS12322 Free SAS 7.20ms from Paris, FR
176.187.25.108 AS5410 Bouygues Telecom SA 4.14ms from Paris, FR

Traceroute

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

$
traceroute -a -n -q1 121.140.81.254
traceroute to 121.140.81.254 (121.140.81.254): 64 hops max, 52 byte packets
3 *
4 *
6 *
7 *
Measurement taken from IPinfo ProbeNet in Seoul, KR
On

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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