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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:         [email protected]
abuse-mailbox:  [email protected]
admin-c:        IM574-AP
tech-c:         IM574-AP
auth:           # Filtered
remarks:        [email protected] 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:         [email protected]
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:         [email protected]
nic-hdl:        IA9-KR
mnt-by:         MNT-KRNIC-AP
changed:        [email protected] 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:         [email protected]
nic-hdl:        IM9-KR
mnt-by:         MNT-KRNIC-AP
changed:        [email protected] 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 AS9808 China Mobile Communications Corporation 524,288
221.224.0.0/13 AS23650 CHINANET jiangsu province network 524,288
221.176.0.0/13 AS56044 China Mobile Communications Corporation 524,288
221.176.0.0/13 AS56042 China Mobile Communications Corporation 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
221.176.0.0/13 AS56046 China Mobile Communications Corporation 524,288
221.224.0.0/13 AS131325 CHINANET jiangsu province network 524,288
221.224.0.0/13 AS134756 CHINANET jiangsu province network 524,288
221.224.0.0/13 AS140292 CHINANET jiangsu province network 524,288
221.224.0.0/13 AS4809 CHINANET jiangsu province network 524,288
221.224.0.0/13 AS4134 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
221.176.0.0/13 AS132510 China Mobile Communications Corporation 524,288
221.184.0.0/13 AS4713 NTT DOCOMO BUSINESS,Inc. 524,288
221.176.0.0/13 AS56040 China Mobile Communications Corporation 524,288
221.216.0.0/13 AS4808 China Unicom Beijing province network 524,288
221.224.0.0/13 AS146966 CHINANET jiangsu province network 524,288
221.176.0.0/13 AS56048 China Mobile Communications Corporation 524,288
221.224.0.0/13 AS137697 CHINANET jiangsu province network 524,288
221.224.0.0/13 AS137702 CHINANET jiangsu province network 524,288
221.224.0.0/13 AS138950 CHINANET jiangsu province network 524,288
221.176.0.0/13 AS139080 China Mobile Communications Corporation 524,288
221.232.0.0/14 AS58563 CHINANET Hubei province network 262,144
221.232.0.0/14 AS4134 CHINANET Hubei province network 262,144
221.200.0.0/14 AS4837 China Unicom Liaoning Province Network 262,144
221.140.0.0/14 AS9318 SK Broadband Co Ltd 262,144
221.124.0.0/14 AS9304 HGC Global Communications Limited 262,144
221.204.0.0/15 AS4837 China Unicom Shanxi Province Network 131,072
221.8.0.0/15 AS4837 China Unicom JILIN 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
221.138.0.0/15 AS9318 SK Broadband Co Ltd 131,072
221.214.0.0/15 AS4837 China Unicom Shandong province network 131,072
221.130.0.0/15 AS56041 China Mobile Communications Corporation 131,072
221.130.0.0/15 AS9808 China Mobile Communications Corporation 131,072
221.6.0.0/16 AS140717 China Unicom Jiangsu province network 65,536
221.10.0.0/16 AS4837 China Unicom SiChuan province network 65,536
221.168.0.0/16 AS4766 Korea Telecom 65,536
221.206.0.0/16 AS4837 China Unicom Heilongjiang Province Network 65,536
221.117.0.0/16 AS17506 ARTERIA Networks Corporation 65,536
221.116.0.0/16 AS17506 ARTERIA Networks Corporation 65,536
221.115.0.0/16 AS17506 ARTERIA Networks Corporation 65,536
221.114.0.0/16 AS17506 ARTERIA Networks Corporation 65,536
221.112.0.0/16 AS17506 ARTERIA Networks Corporation 65,536

Hosted domains

There are 1,767 domain names hosted across 850 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address Domain Domains on this IP
221.148.143.109 breastkwon.com 87
221.149.135.231 future21.or.kr 31
221.148.193.72 congzip.com 27
221.147.192.243 duryuswim.or.kr 22
221.150.86.1 kosca26.or.kr 19
221.150.86.6 kosca36.or.kr 18
221.144.12.64 bestdrivers.kr 14
221.156.137.138 winiaaid.or.kr 14
221.146.177.180 kcfc.asia 12
221.150.239.83 scro.co.kr 11
221.147.192.205 goiwc.co.kr 11
221.151.187.148 ctaskpy.org 10
221.152.146.148 richnong.com 10
221.157.125.140 mk4.co.kr 9
221.149.50.124 linkbro.kr 8
221.156.152.185 olmwoo.com 8
221.145.132.102 shgas.co.kr 7
221.146.6.184 nemonuri.net 6
221.146.140.100 hivisiontech.co.kr 6
221.148.180.40 clonego.co.kr 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

548,071 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address ASN Details
221.152.147.236 AS4766 Korea Telecom 6.26ms from Seoul, KR
221.152.204.254 AS4766 Korea Telecom 7.45ms from Seoul, KR
221.152.105.111 AS4766 Korea Telecom 6.34ms from Seoul, KR
221.152.196.254 AS4766 Korea Telecom 7.36ms from Seoul, KR
221.152.198.129 AS4766 Korea Telecom 6.83ms from Seoul, KR
221.152.202.161 AS4766 Korea Telecom 6.91ms from Seoul, KR
221.152.104.230 AS4766 Korea Telecom 6.34ms from Seoul, KR
221.152.102.58 AS4766 Korea Telecom 6.91ms from Seoul, KR
221.152.91.163 AS4766 Korea Telecom 6.71ms from Seoul, KR
221.152.251.50 AS4766 Korea Telecom 7.54ms from Seoul, KR
221.152.136.22 AS4766 Korea Telecom 7.77ms from Seoul, KR
221.152.189.1 AS4766 Korea Telecom 6.45ms from Seoul, KR
221.152.217.1 AS4766 Korea Telecom 7.00ms from Seoul, KR
221.152.94.227 AS4766 Korea Telecom 6.75ms from Seoul, KR
221.152.122.205 AS4766 Korea Telecom 6.51ms from Seoul, KR
221.152.138.121 AS4766 Korea Telecom 7.22ms from Seoul, KR
221.152.107.7 AS4766 Korea Telecom 5.98ms from Seoul, KR
221.152.162.97 AS4766 Korea Telecom 6.63ms from Seoul, KR
221.152.146.121 AS4766 Korea Telecom 6.53ms from Seoul, KR
221.152.112.142 AS4766 Korea Telecom 7.16ms from Seoul, KR
221.152.211.29 AS4766 Korea Telecom 5.87ms from Seoul, KR
221.152.160.39 AS4766 Korea Telecom 6.20ms from Seoul, KR
221.152.167.16 AS4766 Korea Telecom 6.17ms from Seoul, KR
221.152.253.102 AS4766 Korea Telecom 6.57ms from Seoul, KR
221.152.86.208 AS4766 Korea Telecom 6.54ms 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
118.247.50.252 AS4847 China Networks Inter-Exchange 5.04ms from Beijing, CN
195.138.81.108 AS6876 TENET Scientific Production Enterprise LLC 3.22ms from Chisinau, MD
201.240.128.108 AS6147 INTEGRATEL PERÚ S.A.A. 2.86ms from Lima, PE
90.203.151.28 AS5607 Sky UK Limited 11.31ms from London, GB
128.59.6.124 AS14 Columbia University 1.03ms from New York City, US
185.33.212.12 AS15830 Equinix (EMEA) Acquisition Enterprises B.V. 0.66ms from Paris, FR
112.242.250.28 AS4837 CHINA UNICOM China169 Backbone 7.99ms from Qingdao, CN
175.231.79.92 AS4766 Korea Telecom 1.83ms from Seoul, KR
61.98.36.12 AS9318 SK Broadband Co Ltd 7.68ms from Seoul, KR
34.142.158.28 AS396982 Google LLC 0.12ms from Singapore, SG
189.28.12.28 AS28279 Telgo Telecomunicações Goiás Ltda. 4.49ms from Brasilia, BR
20.203.92.252 AS8075 Microsoft Corporation 3.73ms from Dubai, AE
79.241.225.92 AS3320 Deutsche Telekom AG 4.78ms from Duesseldorf, DE
93.187.60.252 AS48097 nobilia-Werke J. Stickling GmbH & Co. KG 13.13ms from Duesseldorf, DE
84.44.164.220 AS8422 NetCologne Gesellschaft fur Telekommunikation mbH 1.07ms from Duesseldorf, DE
176.198.61.172 AS3209 Vodafone GmbH 7.18ms from Frankfurt am Main, DE
57.128.125.12 AS16276 OVH SAS 0.07ms from Gravelines, FR
27.70.76.124 AS7552 Viettel Group 3.48ms from Hanoi, VN
137.222.16.252 AS786 Jisc Services Limited 6.18ms from London, GB
35.170.32.60 AS14618 Amazon.com, Inc. 0.20ms from Reston, US
67.250.212.188 AS12271 Charter Communications Inc 9.45ms from Secaucus, US
59.87.17.204 AS17506 ARTERIA Networks Corporation 2.23ms from Tokyo, JP
41.227.192.252 AS37671 3S INF 0.38ms from Tunis, TN
67.52.2.76 AS10796 Charter Communications Inc 2.29ms from Chicago, US
128.77.242.60 AS3292 TDC Holding A/S 1.15ms from Copenhagen, DK

Traceroute

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

$
traceroute -a -n -q1 -f4 221.157.15.126
traceroute to 221.157.15.126 (221.157.15.126): 64 hops max, 52 byte packets
4 [AS4766] 112.174.70.34 5.063 ms
5 *
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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