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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 AS56046 China Mobile Communications Corporation 524,288
221.224.0.0/13 AS146966 CHINANET jiangsu province network 524,288
221.176.0.0/13 AS139080 China Mobile Communications Corporation 524,288
221.176.0.0/13 AS132510 China Mobile Communications Corporation 524,288
221.160.0.0/13 AS4766 Korea Telecom 524,288
221.176.0.0/13 AS56044 China Mobile Communications Corporation 524,288
221.224.0.0/13 AS134756 CHINANET jiangsu province network 524,288
221.224.0.0/13 AS131325 CHINANET jiangsu province network 524,288
221.176.0.0/13 AS56042 China Mobile Communications Corporation 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
221.224.0.0/13 AS23650 CHINANET jiangsu province network 524,288
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 AS56040 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 AS24445 China Mobile Communications Corporation 524,288
221.176.0.0/13 AS141425 China Mobile Communications Corporation 524,288
221.224.0.0/13 AS138950 CHINANET jiangsu province network 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
221.216.0.0/13 AS4808 China Unicom Beijing province network 524,288
221.224.0.0/13 AS4809 CHINANET jiangsu province network 524,288
221.232.0.0/14 AS58563 CHINANET Hubei province network 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
221.124.0.0/14 AS9304 HGC Global Communications Limited 262,144
221.232.0.0/14 AS4134 CHINANET Hubei province network 262,144
221.130.0.0/15 AS9808 China Mobile Communications Corporation 131,072
221.130.0.0/15 AS56041 China Mobile Communications Corporation 131,072
221.130.0.0/15 AS56042 China Mobile Communications Corporation 131,072
221.170.0.0/15 AS2518 BIGLOBE Inc. 131,072
221.214.0.0/15 AS4837 China Unicom Shandong province network 131,072
221.138.0.0/15 AS9318 SK Broadband Co Ltd 131,072
221.8.0.0/15 AS4837 China Unicom JILIN province network 131,072
221.204.0.0/15 AS4837 China Unicom Shanxi Province Network 131,072
221.169.0.0/16 AS4780 Digital United I 65,536
221.10.0.0/16 AS4837 China Unicom SiChuan province network 65,536
221.206.0.0/16 AS4837 China Unicom Heilongjiang Province Network 65,536
221.213.0.0/16 AS4837 China Unicom Yunnan province network 65,536
221.6.0.0/16 AS4837 China Unicom Jiangsu province network 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
221.117.0.0/16 AS17506 ARTERIA Networks Corporation 65,536

Hosted domains

There are 1,776 domain names hosted across 840 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 mydocu.kr 129
221.148.143.109 kdtop.co.kr 110
221.156.137.137 lsmunion.co.kr 34
221.149.135.231 desco.co.kr 31
221.148.193.72 flandersdog.com 27
221.147.192.243 ceoclub.or.kr 24
221.144.12.64 massagejob.kr 15
221.156.137.138 kpnojo.or.kr 14
221.150.76.99 orientgenia.com 13
221.150.239.84 chahealthcare.co.kr 13
221.146.177.180 adtseoul.com 12
221.150.239.83 scro.co.kr 11
221.156.137.103 anffis.co.kr 11
221.157.125.147 bonghwarun.kr 11
221.152.146.148 cheongplant.com 10
221.144.86.1 xn--om3bv0hite4qt.com 9
221.157.125.140 goldchain.co.kr 9
221.155.253.133 360tour.kr 9
221.146.142.41 babysos.co.kr 9
221.151.187.148 ctaskpy.org 8

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

540,093 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address ASN Details
221.151.185.152 AS4766 Korea Telecom 1.46ms from Seoul, KR
221.151.176.36 AS4766 Korea Telecom 1.01ms from Seoul, KR
221.151.186.205 AS4766 Korea Telecom 1.12ms from Seoul, KR
221.151.215.1 AS4766 Korea Telecom 2.15ms from Seoul, KR
221.151.207.218 AS4766 Korea Telecom 1.37ms from Seoul, KR
221.151.188.100 AS4766 Korea Telecom 0.88ms from Seoul, KR
221.151.169.196 AS4766 Korea Telecom 1.36ms from Seoul, KR
221.152.3.49 AS4766 Korea Telecom 7.59ms from Seoul, KR
221.151.216.39 AS4766 Korea Telecom 1.36ms from Seoul, KR
221.151.179.94 AS4766 Korea Telecom 1.34ms from Seoul, KR
221.151.249.16 AS4766 Korea Telecom 1.68ms from Seoul, KR
221.151.241.120 AS4766 Korea Telecom 1.70ms from Seoul, KR
221.151.221.210 AS4766 Korea Telecom 1.97ms from Seoul, KR
221.151.251.134 AS4766 Korea Telecom 1.45ms from Seoul, KR
221.151.230.180 AS4766 Korea Telecom 1.67ms from Seoul, KR
221.151.146.54 AS4766 Korea Telecom 1.01ms from Seoul, KR
221.152.19.52 AS4766 Korea Telecom 8.52ms from Seoul, KR
221.151.235.254 AS4766 Korea Telecom 1.77ms from Seoul, KR
221.151.148.197 AS4766 Korea Telecom 1.04ms from Seoul, KR
221.152.34.177 AS4766 Korea Telecom 7.28ms from Seoul, KR
221.151.162.254 AS4766 Korea Telecom 1.05ms from Seoul, KR
221.151.233.84 AS4766 Korea Telecom 1.55ms from Seoul, KR
221.151.175.155 AS4766 Korea Telecom 1.02ms from Seoul, KR
221.152.37.212 AS4766 Korea Telecom 6.61ms from Seoul, KR
221.151.236.67 AS4766 Korea Telecom 1.28ms 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
91.127.203.236 AS6855 Slovak Telekom, a.s. 6.50ms from Bratislava, SK
5.204.103.140 AS213155 Yettel Hungary Ltd. 13.44ms from Budapest, HU
37.50.148.252 AS3320 Deutsche Telekom AG 2.54ms from Duesseldorf, DE
36.1.221.44 AS4134 CHINANET-BACKBONE 4.11ms from Haikou, CN
14.167.220.76 AS45899 VNPT Corp 2.14ms from Ho Chi Minh City, VN
180.223.228.156 AS9304 HGC Global Communications Limited 2.93ms from Hong Kong, HK
77.123.138.44 AS35680 Volia-Cable LLC 0.38ms from Kyiv, UA
92.133.45.252 AS3215 Orange S.A. 9.40ms from Paris, FR
34.237.134.252 AS14618 Amazon.com, Inc. 0.18ms from Reston, US
58.110.95.124 AS4804 Microplex PTY LTD 4.65ms from Sydney, AU
122.187.181.12 AS9498 BHARTI Airtel Ltd. 1.96ms from Bengaluru, IN
91.66.233.252 AS3209 Vodafone GmbH 6.02ms from Frankfurt am Main, DE
93.230.185.204 AS3320 Deutsche Telekom AG 6.71ms from Frankfurt am Main, DE
84.167.44.12 AS3320 Deutsche Telekom AG 3.41ms from Hamburg, DE
122.170.236.44 AS24560 Bharti Airtel Ltd., Telemedia Services 2.05ms from Lohogaon, IN
18.135.57.92 AS16509 Amazon.com, Inc. 0.15ms from London, GB
91.156.6.124 AS719 Elisa Oyj 6.63ms from Oulu, FI
52.23.75.172 AS14618 Amazon.com, Inc. 0.22ms from Reston, US
73.221.123.220 AS7922 Comcast Cable Communications, LLC 11.74ms from Seattle, US
125.242.78.252 AS17858 LG POWERCOMM 2.27ms from Seoul, KR
13.115.5.204 AS16509 Amazon.com, Inc. 0.19ms from Tokyo, JP
121.19.209.108 AS4837 CHINA UNICOM China169 Backbone 9.55ms from Beijing, CN
172.200.92.28 AS8075 Microsoft Corporation 0.24ms from Boydton, US
173.27.55.12 AS30036 Mediacom Communications Corp 15.47ms from Chicago, US
27.15.54.236 AS4837 CHINA UNICOM China169 Backbone 8.16ms from Chongqing, CN

Traceroute

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

$
traceroute -a -n -q1 221.144.158.252
traceroute to 221.144.158.252 (221.144.158.252): 64 hops max, 52 byte packets
1 [AS15169] 74.125.37.114 222.223 ms
2 *
3 [AS4766] 112.174.84.69 250.324 ms
4 *
5 *
6 *
7 *
Measurement taken from IPinfo ProbeNet in Paris, FR
On

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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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