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  2. 221.0.0.0/8
  3. AS4766  | 221.144.0.0/12

221.144.0.0/12

AS4766  ·  Korea Telecom

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Summary

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

WHOIS Details

inetnum:        221.144.0.0 - 221.159.255.255
netname:        KORNET
descr:          Korea Telecom
country:        KR
admin-c:        IM667-AP
tech-c:         IM667-AP
status:         ALLOCATED PORTABLE
mnt-by:         MNT-KRNIC-AP
mnt-irt:        IRT-KRNIC-KR
last-modified:  2025-11-03T08:15:09Z
source:         APNIC

irt:            IRT-KRNIC-KR
address:        9, Jinheung-gil, Naju-si, Jeollanam-do
e-mail:         irt@nic.or.kr
abuse-mailbox:  irt@nic.or.kr
admin-c:        IM574-AP
tech-c:         IM574-AP
auth:           # Filtered
remarks:        irt@nic.or.kr was validated on 2020-04-09
mnt-by:         MNT-KRNIC-AP
last-modified:  2025-09-04T01:00:01Z
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
last-modified:  2017-03-28T06:37:04Z
source:         APNIC

inetnum:        221.144.0.0 - 221.159.255.255
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.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

Nearby Ranges

BGP prefixes that overlap with 221.0.0.0/8

Range ASN Company Num of IPs
221.240.0.0/12 AS17506 ARTERIA Networks Corporation 1,048,576
221.176.0.0/13 AS56048 China Mobile Communications Corporation 524,288
221.224.0.0/13 AS4134 CHINANET jiangsu province network 524,288
221.176.0.0/13 AS56046 China Mobile Communications Corporation 524,288
221.176.0.0/13 AS56044 China Mobile Communications Corporation 524,288
221.176.0.0/13 AS56040 China Mobile Communications Corporation 524,288
221.160.0.0/13 AS9780 Korea Telecom 524,288
221.176.0.0/13 AS56042 China Mobile Communications Corporation 524,288
221.160.0.0/13 AS38422 Korea Telecom 524,288
221.184.0.0/13 AS4713 NTT DOCOMO BUSINESS,Inc. 524,288
221.224.0.0/13 AS131325 CHINANET jiangsu province network 524,288
221.224.0.0/13 AS137697 CHINANET jiangsu province network 524,288
221.224.0.0/13 AS138950 CHINANET jiangsu province network 524,288
221.224.0.0/13 AS140292 CHINANET jiangsu province network 524,288
221.224.0.0/13 AS134770 CHINANET jiangsu province network 524,288
221.176.0.0/13 AS24445 China Mobile Communications Corporation 524,288
221.224.0.0/13 AS134756 CHINANET jiangsu province network 524,288
221.160.0.0/13 AS131101 Korea Telecom 524,288
221.176.0.0/13 AS132510 China Mobile Communications Corporation 524,288
221.160.0.0/13 AS4766 Korea Telecom 524,288
221.224.0.0/13 AS4809 CHINANET jiangsu province network 524,288
221.176.0.0/13 AS9808 China Mobile Communications Corporation 524,288
221.160.0.0/13 AS9631 Korea Telecom 524,288
221.224.0.0/13 AS23650 CHINANET jiangsu province network 524,288
221.224.0.0/13 AS146966 CHINANET jiangsu province network 524,288
221.224.0.0/13 AS137702 CHINANET jiangsu province network 524,288
221.176.0.0/13 AS141425 China Mobile Communications Corporation 524,288
221.176.0.0/13 AS139080 China Mobile Communications Corporation 524,288
221.160.0.0/13 AS18323 Korea Telecom 524,288
221.216.0.0/13 AS4808 China Unicom Beijing province network 524,288
221.124.0.0/14 AS9304 HGC Global Communications Limited 262,144
221.140.0.0/14 AS9318 SK Broadband Co Ltd 262,144
221.200.0.0/14 AS4837 China Unicom Liaoning Province Network 262,144
221.232.0.0/14 AS58563 CHINANET Hubei province network 262,144
221.140.0.0/14 AS131812 SK Broadband Co Ltd 262,144
221.140.0.0/14 AS16669 SK Broadband Co Ltd 262,144

Hosted domains

There are 1,791 domain names hosted across 839 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address Domain Domains on this IP
221.153.35.130 kanghow.kr 129
221.148.143.109 theclassicclinic.com 127
221.159.48.60 maxcard.kr 28
221.148.193.72 evermata.com 27
221.150.239.84 bioinsurance.co.kr 13
221.146.177.180 the42.co.kr 12
221.156.137.103 labellemere.co.kr 11
221.147.192.205 i2corp.co.kr 11
221.157.125.147 dnk.kr 11
221.157.125.140 singlestore.shop 9
221.156.152.185 olmwoo.com 8
221.157.125.135 core-jewelry.com 7
221.148.180.40 clonego.co.kr 7
221.144.61.90 uwork.kr 7
221.158.107.100 kgc-cn.com 6
221.149.101.250 soonseok.or.kr 6
221.144.61.81 yellowhealing.com 6
221.146.6.184 nemonuri.co.kr 6
221.149.71.17 darong.net 6
221.150.229.149 hatsunemiku.net 6

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

542,511 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address ASN Details
221.158.206.169 AS4766 Korea Telecom 4.25ms from Seoul, KR
221.158.225.180 AS4766 Korea Telecom 4.33ms from Seoul, KR
221.158.235.6 AS4766 Korea Telecom 4.06ms from Seoul, KR
221.158.227.25 AS4766 Korea Telecom 4.79ms from Seoul, KR
221.158.142.3 AS4766 Korea Telecom 3.24ms from Seoul, KR
221.158.168.94 AS4766 Korea Telecom 5.13ms from Seoul, KR
221.158.194.252 AS4766 Korea Telecom 3.07ms from Seoul, KR
221.158.170.1 AS4766 Korea Telecom 3.26ms from Seoul, KR
221.158.123.57 AS4766 Korea Telecom 4.37ms from Seoul, KR
221.158.222.233 AS4766 Korea Telecom 3.32ms from Seoul, KR
221.158.224.1 AS4766 Korea Telecom 4.41ms from Seoul, KR
221.158.243.1 AS4766 Korea Telecom 4.24ms from Seoul, KR
221.158.143.157 AS4766 Korea Telecom 3.31ms from Seoul, KR
221.158.125.1 AS4766 Korea Telecom 5.83ms from Seoul, KR
221.158.122.225 AS4766 Korea Telecom 4.11ms from Seoul, KR
221.158.207.214 AS4766 Korea Telecom 4.11ms from Seoul, KR
221.158.155.33 AS4766 Korea Telecom 3.52ms from Seoul, KR
221.158.177.203 AS4766 Korea Telecom 3.32ms from Seoul, KR
221.158.205.90 AS4766 Korea Telecom 3.08ms from Seoul, KR
221.158.113.62 AS4766 Korea Telecom 4.87ms from Seoul, KR
221.158.156.32 AS4766 Korea Telecom 3.84ms from Seoul, KR
221.158.230.1 AS4766 Korea Telecom 5.18ms from Seoul, KR
221.158.210.94 AS4766 Korea Telecom 3.69ms from Seoul, KR
221.158.188.137 AS4766 Korea Telecom 3.10ms from Seoul, KR
221.158.178.1 AS4766 Korea Telecom 3.56ms 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
44.225.151.172 AS16509 Amazon.com, Inc. 0.12ms from Boardman, US
24.63.78.12 AS7922 Comcast Cable Communications, LLC 8.89ms from Boston, US
85.115.46.156 AS44444 Forcepoint UK Limited 0.29ms from Dubai, AE
51.68.224.124 AS16276 OVH SAS 0.15ms from Gravelines, FR
162.197.165.108 AS7018 AT&T Enterprises, LLC 2.49ms from Miami, US
191.197.129.60 AS26599 TELEFÔNICA BRASIL S.A 3.61ms from Novo Hamburgo, BR
115.37.28.92 AS18126 Chubu Telecommunications Company, Inc. 4.10ms from Osaka, JP
115.162.215.220 AS2527 Sony Network Communications Inc. 4.55ms from Osaka, JP
14.72.48.28 AS4766 Korea Telecom 1.18ms from Seoul, KR
118.25.7.252 AS45090 Shenzhen Tencent Computer Systems Company Limited 0.72ms from Shanghai, CN
176.238.56.12 AS16135 Turkcell A.S. 18.20ms from Ankara, TR
51.8.76.172 AS8075 Microsoft Corporation 0.41ms from Ashburn, US
89.132.152.44 AS21334 One Hungary Ltd. 0.58ms from Budapest, HU
78.166.195.188 AS47331 TTNet A.S. 13.26ms from Bursa, TR
129.229.91.28 AS668 United States Department of Defense (DoD) 4.20ms from Chicago, US
116.110.62.44 AS24086 Viettel Corporation 15.85ms from Ho Chi Minh City, VN
8.212.2.60 AS45102 Alibaba (US) Technology Co., Ltd. 0.79ms from Hong Kong, HK
72.179.5.156 AS11427 Charter Communications Inc 4.47ms from Houston, US
123.233.17.124 AS4837 CHINA UNICOM China169 Backbone 2.36ms from Jinan, CN
185.173.114.60 AS51522 ONLINE LLC 12.83ms from Krasnodar, RU
18.171.21.12 AS16509 Amazon.com, Inc. 0.19ms from London, GB
91.37.118.236 AS3320 Deutsche Telekom AG 5.51ms from Nuernberg, DE
58.7.213.124 AS7545 TPG Telecom Limited 1.25ms from Perth, AU
97.215.163.12 AS6167 Verizon Business 13.69ms from San Jose, US
121.173.4.44 AS4766 Korea Telecom 1.19ms 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 221.151.99.158
traceroute to 221.151.99.158 (221.151.99.158): 64 hops max, 52 byte packets
1 [AS31898] 140.91.214.1 0.082 ms
2 [AS4766] 218.145.32.254 29.389 ms
3 *
4 *
6 *
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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