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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
221.184.0.0/13 AS4713 NTT DOCOMO BUSINESS,Inc. 524,288
221.176.0.0/13 AS9808 China Mobile Communications Corporation 524,288
221.176.0.0/13 AS56048 China Mobile Communications Corporation 524,288
221.224.0.0/13 AS146966 CHINANET jiangsu province network 524,288
221.224.0.0/13 AS4134 CHINANET jiangsu province network 524,288
221.160.0.0/13 AS4766 Korea Telecom 524,288
221.176.0.0/13 AS56046 China Mobile Communications Corporation 524,288
221.224.0.0/13 AS131325 CHINANET jiangsu province network 524,288
221.224.0.0/13 AS138950 CHINANET jiangsu province network 524,288
221.224.0.0/13 AS134756 CHINANET jiangsu province network 524,288
221.176.0.0/13 AS56044 China Mobile Communications Corporation 524,288
221.216.0.0/13 AS4808 China Unicom Beijing province network 524,288
221.224.0.0/13 AS4809 CHINANET jiangsu province network 524,288
221.224.0.0/13 AS23650 CHINANET jiangsu province network 524,288
221.176.0.0/13 AS56042 China Mobile Communications Corporation 524,288
221.176.0.0/13 AS56040 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 AS132510 China Mobile Communications Corporation 524,288
221.176.0.0/13 AS141425 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 AS140292 CHINANET jiangsu province network 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 1,791 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
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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
221.145.21.107 AS4766 Korea Telecom 1.28ms from Seoul, KR
221.145.17.13 AS4766 Korea Telecom 1.36ms from Seoul, KR
221.144.214.41 AS4766 Korea Telecom 2.88ms from Seoul, KR
221.144.244.19 AS4766 Korea Telecom 2.92ms from Seoul, KR
221.144.178.36 AS4766 Korea Telecom 2.75ms from Seoul, KR
221.144.237.34 AS4766 Korea Telecom 2.71ms from Seoul, KR
221.145.22.33 AS4766 Korea Telecom 1.40ms from Seoul, KR
221.144.251.107 AS4766 Korea Telecom 5.00ms from Seoul, KR
221.144.116.199 AS4766 Korea Telecom 4.64ms from Seoul, KR
221.144.141.85 AS4766 Korea Telecom 2.73ms from Seoul, KR
221.144.148.1 AS4766 Korea Telecom 5.14ms from Seoul, KR
221.144.208.237 AS4766 Korea Telecom 2.70ms from Seoul, KR
221.144.160.65 AS4766 Korea Telecom 4.03ms from Seoul, KR
221.144.120.123 AS4766 Korea Telecom 6.30ms from Seoul, KR
221.144.225.129 AS4766 Korea Telecom 2.93ms from Seoul, KR
221.144.143.1 AS4766 Korea Telecom 6.06ms from Seoul, KR
221.144.113.196 AS4766 Korea Telecom 5.02ms from Seoul, KR
221.144.109.180 AS4766 Korea Telecom 5.46ms from Seoul, KR
221.144.212.118 AS4766 Korea Telecom 2.87ms from Seoul, KR
221.144.224.134 AS4766 Korea Telecom 3.04ms from Seoul, KR
221.144.239.150 AS4766 Korea Telecom 3.31ms from Seoul, KR
221.144.167.129 AS4766 Korea Telecom 4.29ms from Seoul, KR
221.144.240.174 AS4766 Korea Telecom 4.27ms from Seoul, KR
221.144.105.124 AS4766 Korea Telecom 5.26ms from Seoul, KR
221.144.200.225 AS4766 Korea Telecom 3.89ms 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
109.51.207.60 AS2860 NOS COMUNICACOES, S.A. 1.99ms from Lisbon, PT
95.220.72.60 AS12714 PJSC MegaFon 1.77ms from Moscow, RU
115.37.28.92 AS18126 Chubu Telecommunications Company, Inc. 4.10ms from Osaka, JP
220.78.166.108 AS4766 Korea Telecom 1.77ms from Seoul, KR
126.108.136.12 AS17676 SoftBank Corp. 7.27ms from Tokyo, JP
36.64.108.204 AS7713 PT Telekomunikasi Indonesia 0.87ms from Batam, ID
102.98.91.76 AS36925 MEDITELECOM 4.33ms from Casablanca, MA
98.179.210.60 AS22773 Cox Communications Inc. 12.17ms from Dallas, US
57.132.194.204 AS7459 Grande Communications Networks, LLC 6.74ms from Dallas, US
54.74.127.92 AS16509 Amazon.com, Inc. 0.27ms from Dublin, IE
84.44.164.220 AS8422 NetCologne Gesellschaft fur Telekommunikation mbH 1.07ms from Duesseldorf, DE
222.85.193.12 AS4134 CHINANET-BACKBONE 1.79ms from Guiyang, CN
8.212.2.60 AS45102 Alibaba (US) Technology Co., Ltd. 0.79ms from Hong Kong, HK
105.213.137.12 AS16637 MTN SA 3.33ms from Johannesburg, ZA
213.106.226.252 AS5089 Virgin Media Limited 2.52ms from London, GB
90.212.34.156 AS5607 Sky UK Limited 7.92ms from London, GB
191.197.129.60 AS26599 TELEFÔNICA BRASIL S.A 3.61ms from Novo Hamburgo, BR
84.145.90.28 AS3320 Deutsche Telekom AG 5.54ms from Nuernberg, DE
88.188.141.60 AS12322 Free SAS 2.36ms from Paris, FR
125.139.40.188 AS4766 Korea Telecom 4.51ms from Seoul, KR
35.77.129.76 AS16509 Amazon.com, Inc. 0.20ms from Tokyo, JP
60.67.148.172 AS17676 SoftBank Corp. 3.28ms from Tokyo, JP
129.97.54.252 AS12093 University of Waterloo 2.03ms from Toronto, CA
141.30.228.28 AS680 Verein zur Foerderung eines Deutschen Forschungsnetzes e.V. 3.43ms from Berlin, DE
102.134.94.12 AS329153 ISWCORP (PTY) LTD 4.98ms from Cape Town, ZA

Traceroute

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

$
traceroute -a -n -q1 221.148.125.153
traceroute to 221.148.125.153 (221.148.125.153): 64 hops max, 52 byte packets
3 *
4 *
6 *
Measurement taken from IPinfo ProbeNet in Seoul, KR
On

What are IP address ranges?

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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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