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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
221.216.0.0/13 AS4808 China Unicom Beijing province network 524,288
221.176.0.0/13 AS9808 China Mobile Communications Corporation 524,288
221.224.0.0/13 AS23650 CHINANET jiangsu province network 524,288
221.224.0.0/13 AS134756 CHINANET jiangsu province network 524,288
221.176.0.0/13 AS56042 China Mobile Communications Corporation 524,288
221.224.0.0/13 AS138950 CHINANET jiangsu province network 524,288
221.224.0.0/13 AS146966 CHINANET jiangsu province network 524,288
221.176.0.0/13 AS132510 China Mobile Communications Corporation 524,288
221.176.0.0/13 AS139080 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
221.176.0.0/13 AS56044 China Mobile Communications Corporation 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
221.184.0.0/13 AS4713 NTT DOCOMO BUSINESS,Inc. 524,288
221.224.0.0/13 AS4134 CHINANET jiangsu province network 524,288
221.160.0.0/13 AS4766 Korea Telecom 524,288
221.224.0.0/13 AS134770 CHINANET jiangsu province network 524,288
221.176.0.0/13 AS56040 China Mobile Communications Corporation 524,288
221.176.0.0/13 AS56048 China Mobile Communications Corporation 524,288
221.176.0.0/13 AS24445 China Mobile Communications Corporation 524,288
221.176.0.0/13 AS141425 China Mobile Communications Corporation 524,288
221.224.0.0/13 AS137702 CHINANET jiangsu province network 524,288
221.224.0.0/13 AS137697 CHINANET jiangsu province network 524,288
221.232.0.0/14 AS4134 CHINANET Hubei 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
221.232.0.0/14 AS58563 CHINANET Hubei province network 262,144
221.200.0.0/14 AS4837 China Unicom Liaoning Province Network 262,144
221.130.0.0/15 AS9808 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
221.8.0.0/15 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 AS56042 China Mobile Communications Corporation 131,072
221.130.0.0/15 AS56041 China Mobile Communications Corporation 131,072
221.170.0.0/15 AS2518 BIGLOBE Inc. 131,072
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
221.117.0.0/16 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
221.129.0.0/16 AS23841 TIANJIN BROADCAST & TV NETWORK CO. LTD 65,536
221.119.0.0/16 AS2516 KDDI 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
221.146.78.129 AS4766 Korea Telecom 1.36ms from Seoul, KR
221.145.204.216 AS4766 Korea Telecom 3.39ms from Seoul, KR
221.146.55.24 AS4766 Korea Telecom 1.39ms from Seoul, KR
221.146.14.223 AS4766 Korea Telecom 1.57ms from Seoul, KR
221.146.31.218 AS4766 Korea Telecom 1.35ms from Seoul, KR
221.145.159.1 AS4766 Korea Telecom 4.20ms from Seoul, KR
221.145.235.174 AS4766 Korea Telecom 4.67ms from Seoul, KR
221.146.28.35 AS4766 Korea Telecom 1.25ms from Seoul, KR
221.146.82.65 AS4766 Korea Telecom 1.38ms from Seoul, KR
221.145.253.254 AS4766 Korea Telecom 2.87ms from Seoul, KR
221.145.185.129 AS4766 Korea Telecom 5.65ms from Seoul, KR
221.146.24.182 AS4766 Korea Telecom 1.18ms from Seoul, KR
221.146.6.12 AS4766 Korea Telecom 2.04ms from Seoul, KR
221.145.170.120 AS4766 Korea Telecom 3.05ms from Seoul, KR
221.146.54.82 AS4766 Korea Telecom 1.41ms from Seoul, KR
221.145.232.1 AS4766 Korea Telecom 4.04ms from Seoul, KR
221.145.206.223 AS4766 Korea Telecom 3.16ms from Seoul, KR
221.145.205.239 AS4766 Korea Telecom 3.57ms from Seoul, KR
221.145.188.68 AS4766 Korea Telecom 4.92ms from Seoul, KR
221.146.1.122 AS4766 Korea Telecom 1.47ms from Seoul, KR
221.145.227.117 AS4766 Korea Telecom 2.69ms from Seoul, KR
221.146.22.254 AS4766 Korea Telecom 1.57ms from Seoul, KR
221.145.186.159 AS4766 Korea Telecom 6.32ms from Seoul, KR
221.146.84.254 AS4766 Korea Telecom 1.78ms from Seoul, KR
221.145.221.77 AS4766 Korea Telecom 3.38ms 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
40.114.8.140 AS8075 Microsoft Corporation 0.40ms from Ashburn, US
172.72.164.204 AS11426 Charter Communications Inc 5.15ms from Charlotte, US
207.140.129.156 AS7018 AT&T Enterprises, LLC 9.23ms from Chicago, US
54.74.127.92 AS16509 Amazon.com, Inc. 0.27ms from Dublin, IE
112.89.160.76 AS17816 China Unicom IP network China169 Guangdong province 5.17ms from Guangzhou, CN
115.193.170.124 AS4134 CHINANET-BACKBONE 6.28ms from Hangzhou, CN
213.106.226.252 AS5089 Virgin Media Limited 2.52ms from London, GB
51.95.70.76 AS16509 Amazon.com, Inc. 6.09ms from Madrid, ES
80.27.215.140 AS3352 TELEFONICA DE ESPANA S.A.U. 17.33ms from Madrid, ES
199.231.105.252 AS16908 Advanced Technologies Research Group, Inc. 0.33ms from New York City, US
180.172.159.156 AS4812 China Telecom (Group) 5.24ms from Shanghai, CN
5.29.137.236 AS12849 Hot-Net internet services Ltd. 1.76ms from Tel Aviv, IL
60.67.148.172 AS17676 SoftBank Corp. 3.28ms from Tokyo, JP
51.8.76.172 AS8075 Microsoft Corporation 0.41ms from Ashburn, US
194.94.84.140 AS680 Verein zur Foerderung eines Deutschen Forschungsnetzes e.V. 10.10ms from Berlin, DE
181.32.72.252 AS3816 COLOMBIA TELECOMUNICACIONES S.A. ESP BIC 8.21ms from Bogota, CO
51.68.224.124 AS16276 OVH SAS 0.15ms from Gravelines, FR
59.34.148.76 AS4134 CHINANET-BACKBONE 10.15ms from Guangzhou, CN
8.212.2.60 AS45102 Alibaba (US) Technology Co., Ltd. 0.79ms from Hong Kong, HK
90.212.34.156 AS5607 Sky UK Limited 7.92ms from London, GB
137.222.16.252 AS786 Jisc Services Limited 6.21ms from London, GB
113.203.166.220 AS12479 Orange Espagne SA 1.54ms from Madrid, ES
38.32.119.108 AS174 Cogent Communications, LLC 0.46ms from Miami, US
2.62.94.204 AS12389 PJSC Rostelecom 8.65ms from Novosibirsk, RU
115.162.215.220 AS2527 Sony Network Communications Inc. 4.55ms from Osaka, JP

Traceroute

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

$
traceroute -a -n -q1 221.146.116.165
traceroute to 221.146.116.165 (221.146.116.165): 64 hops max, 52 byte packets
2 *
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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