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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

Overlapping Ranges

BGP prefixes that are contained by 221.144.0.0/12

Range ASN Company Num of IPs
221.157.127.0/24 AS4766 Gyeongbukgwahakdaehakgyo 256
221.149.141.0/24 AS10185 (ju)hanaeunhaeng 256
221.158.73.0/24 AS17576 Jaedanbeopin hangukyeongujaedan 256
221.150.131.0/24 AS17851 Korea Telecom 256
221.151.165.0/24 AS38405 Korea Telecom 256
221.150.196.0/24 AS38697 Hangyeongdaehakgyo 256
221.149.230.0/24 AS45360 SKbrodeudeu(ju) 256
221.145.178.0/24 AS45400 Korea Telecom 256
221.144.37.0/24 AS4766 Nambudaehakgyo 256
221.145.224.0/24 AS4766 (hak)toldaehakgyodaejeonseongmobyeongwon 256
221.146.17.0/24 AS4766 Sejongsaibeodaehakgyo 256
221.147.51.0/24 AS4766 Seongmobyeongwon 256
221.147.52.0/24 AS4766 Seongmobyeongwon 256
221.147.53.0/24 AS4766 Seongmobyeongwon 256
221.147.54.0/24 AS4766 Seongmobyeongwon 256
221.147.55.0/24 AS4766 Seongmobyeongwon 256
221.151.180.0/24 AS9526 (ju)koseu 256
221.147.101.0/24 AS9850 (ju)waitibi 256
221.153.249.0/24 AS4766 Dongwondaehak 256
221.154.82.0/24 AS4766 Inhagongeopjeonmundaehak 256
221.154.83.0/24 AS4766 Inhagongeopjeonmundaehak 256
221.154.84.0/24 AS4766 Inhagongeopjeonmundaehak 256
221.154.85.0/24 AS4766 Inhagongeopjeonmundaehak 256
221.154.86.0/24 AS4766 Inhagongeopjeonmundaehak 256
221.154.87.0/24 AS4766 Inhagongeopjeonmundaehak 256
221.154.88.0/24 AS4766 Inhagongeopjeonmundaehak 256
221.154.89.0/24 AS4766 Inhagongeopjeonmundaehak 256
221.154.90.0/24 AS4766 Inhagongeopjeonmundaehak 256
221.157.116.0/24 AS4766 Gyemyeongmunhwadaehakgyojang 256
221.157.126.0/24 AS4766 Gyeongbukgwahakdaehakgyo 256
221.150.21.0/24 AS10184 (sa)saemaeulgeumgoyeonhaphoe 256
221.159.130.0/24 AS4766 Jeonbukdaehakgyo pyeongsaenggyoyukwon 256
221.159.186.0/24 AS4766 Jeonjubijeondaehak 256
221.159.187.0/24 AS4766 Jeonjubijeondaehak 256
221.144.152.0/24 AS55622 Chuncheongyoyukdaehak 256
221.159.210.0/24 AS55622 Chuncheongyoyukdaehak 256
221.147.83.0/24 AS9526 (ju)koseu 256
221.150.156.0/23 AS4766 Dongwondaehak 512

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 AS139080 China Mobile Communications Corporation 524,288
221.224.0.0/13 AS134770 CHINANET jiangsu province network 524,288
221.224.0.0/13 AS137702 CHINANET jiangsu province network 524,288
221.224.0.0/13 AS146966 CHINANET jiangsu province network 524,288
221.224.0.0/13 AS140292 CHINANET jiangsu province network 524,288
221.176.0.0/13 AS9808 China Mobile Communications Corporation 524,288
221.224.0.0/13 AS137697 CHINANET jiangsu province network 524,288
221.224.0.0/13 AS131325 CHINANET jiangsu province network 524,288
221.176.0.0/13 AS24445 China Mobile Communications Corporation 524,288
221.224.0.0/13 AS138950 CHINANET jiangsu province network 524,288
221.176.0.0/13 AS141425 China Mobile Communications Corporation 524,288
221.160.0.0/13 AS4766 Korea Telecom 524,288
221.224.0.0/13 AS23650 CHINANET jiangsu province network 524,288
221.176.0.0/13 AS132510 China Mobile Communications Corporation 524,288
221.224.0.0/13 AS134756 CHINANET jiangsu province network 524,288
221.176.0.0/13 AS56048 China Mobile Communications Corporation 524,288
221.216.0.0/13 AS4808 China Unicom Beijing province network 524,288
221.176.0.0/13 AS56042 China Mobile Communications Corporation 524,288
221.224.0.0/13 AS4134 CHINANET jiangsu province network 524,288
221.176.0.0/13 AS56040 China Mobile Communications Corporation 524,288
221.224.0.0/13 AS4809 CHINANET jiangsu province network 524,288
221.184.0.0/13 AS4713 NTT DOCOMO BUSINESS,Inc. 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
221.200.0.0/14 AS4837 China Unicom Liaoning Province Network 262,144
221.232.0.0/14 AS4134 CHINANET Hubei province network 262,144
221.124.0.0/14 AS9304 HGC Global Communications Limited 262,144
221.232.0.0/14 AS58563 CHINANET Hubei province network 262,144
221.140.0.0/14 AS9318 SK Broadband Co Ltd 262,144
221.8.0.0/15 AS4837 China Unicom JILIN province network 131,072
221.138.0.0/15 AS9318 SK Broadband Co Ltd 131,072
221.130.0.0/15 AS9808 China Mobile Communications Corporation 131,072
221.130.0.0/15 AS56041 China Mobile Communications Corporation 131,072
221.204.0.0/15 AS4837 China Unicom Shanxi Province Network 131,072
221.214.0.0/15 AS4837 China Unicom Shandong province network 131,072
221.130.0.0/15 AS56042 China Mobile Communications Corporation 131,072
221.170.0.0/15 AS2518 BIGLOBE Inc. 131,072
221.10.0.0/16 AS4837 China Unicom SiChuan province network 65,536
221.6.0.0/16 AS4837 China Unicom Jiangsu province network 65,536
221.213.0.0/16 AS4837 China Unicom Yunnan province network 65,536
221.206.0.0/16 AS4837 China Unicom Heilongjiang Province Network 65,536
221.169.0.0/16 AS4780 Digital United I 65,536
221.119.0.0/16 AS2516 KDDI CORPORATION 65,536
221.6.0.0/16 AS140717 China Unicom Jiangsu province network 65,536
221.168.0.0/16 AS4766 Korea Telecom 65,536
221.116.0.0/16 AS17506 ARTERIA Networks Corporation 65,536

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
221.152.213.229 AS4766 Korea Telecom 8.33ms from Seoul, KR
221.152.150.198 AS4766 Korea Telecom 6.50ms from Seoul, KR
221.152.83.138 AS4766 Korea Telecom 8.97ms from Seoul, KR
221.152.8.215 AS4766 Korea Telecom 7.65ms from Seoul, KR
221.152.224.197 AS4766 Korea Telecom 7.29ms from Seoul, KR
221.152.171.189 AS4766 Korea Telecom 6.70ms from Seoul, KR
221.152.182.193 AS4766 Korea Telecom 8.16ms from Seoul, KR
221.152.93.180 AS4766 Korea Telecom 7.37ms from Seoul, KR
221.152.95.81 AS4766 Korea Telecom 7.29ms from Seoul, KR
221.152.251.1 AS4766 Korea Telecom 7.94ms from Seoul, KR
221.152.230.180 AS4766 Korea Telecom 6.62ms from Seoul, KR
221.152.248.161 AS4766 Korea Telecom 5.90ms from Seoul, KR
221.152.69.87 AS4766 Korea Telecom 8.53ms from Seoul, KR
221.152.122.101 AS4766 Korea Telecom 6.57ms from Seoul, KR
221.152.169.72 AS4766 Korea Telecom 6.42ms from Seoul, KR
221.152.76.193 AS4766 Korea Telecom 8.13ms from Seoul, KR
221.152.243.153 AS4766 Korea Telecom 6.44ms from Seoul, KR
221.152.90.62 AS4766 Korea Telecom 7.47ms from Seoul, KR
221.152.160.36 AS4766 Korea Telecom 6.14ms from Seoul, KR
221.152.184.178 AS4766 Korea Telecom 7.36ms from Seoul, KR
221.152.214.172 AS4766 Korea Telecom 8.41ms from Seoul, KR
221.152.206.133 AS4766 Korea Telecom 7.33ms from Seoul, KR
221.152.33.142 AS4766 Korea Telecom 7.82ms from Seoul, KR
221.152.225.135 AS4766 Korea Telecom 6.83ms from Seoul, KR
221.152.72.62 AS4766 Korea Telecom 7.61ms 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
167.0.104.236 AS3816 COLOMBIA TELECOMUNICACIONES S.A. ESP BIC 3.06ms from Bogota, CO
102.134.94.12 AS329153 ISWCORP (PTY) LTD 4.98ms from Cape Town, ZA
129.229.91.28 AS668 United States Department of Defense (DoD) 4.20ms from Chicago, US
52.162.38.140 AS8075 Microsoft Corporation 0.31ms from Chicago, US
3.145.146.188 AS16509 Amazon.com, Inc. 0.66ms from Columbus, US
169.53.35.60 AS36351 IBM Cloud 0.96ms from Dallas, US
54.74.127.92 AS16509 Amazon.com, Inc. 0.27ms from Dublin, IE
36.25.209.252 AS4134 CHINANET-BACKBONE 9.28ms from Hangzhou, CN
47.52.214.124 AS45102 Alibaba (US) Technology Co., Ltd. 1.35ms from Hong Kong, HK
31.145.177.204 AS15924 Vodafone Net Iletisim Hizmetler AS 1.59ms from Istanbul, TR
202.184.61.60 AS9930 TTNET-MY 1.66ms from Kuala Lumpur, MY
15.185.115.92 AS16509 Amazon.com, Inc. 0.46ms from Manama, BH
60.140.210.172 AS17676 SoftBank Corp. 3.68ms from Osaka, JP
27.134.137.204 AS7522 STNet, Incorporated 4.16ms from Osaka, JP
179.152.73.108 AS28573 Claro NXT Telecomunicacoes Ltda 6.00ms from Porto Alegre, BR
111.231.8.92 AS45090 Shenzhen Tencent Computer Systems Company Limited 0.69ms from Shanghai, CN
94.111.74.188 AS47377 Orange Belgium SA 14.22ms from Amsterdam, NL
88.132.219.108 AS47159 Celldomolki Kabeltelevizio Kft. 11.37ms from Budapest, HU
79.227.215.156 AS3320 Deutsche Telekom AG 4.46ms from Duesseldorf, DE
213.131.233.60 AS61157 PlusServer GmbH 0.35ms from Duesseldorf, DE
41.136.168.172 AS23889 Mauritius Telecom Ltd 2.79ms from Ebene, MU
91.66.233.252 AS3209 Vodafone GmbH 6.10ms from Frankfurt am Main, DE
72.179.5.156 AS11427 Charter Communications Inc 4.47ms from Houston, US
173.174.1.44 AS11427 Charter Communications Inc 12.63ms from Houston, US
124.94.104.140 AS4837 CHINA UNICOM China169 Backbone 8.48ms from Liaoyang, CN

Traceroute

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

$
traceroute -a -n -q1 221.157.49.95
traceroute to 221.157.49.95 (221.157.49.95): 64 hops max, 52 byte packets
2 *
3 *
5 *
7 [AS4766] 221.157.49.95 7.008 ms
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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