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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 AS9808 China Mobile Communications Corporation 524,288
221.216.0.0/13 AS4808 China Unicom Beijing province network 524,288
221.176.0.0/13 AS139080 China Mobile Communications Corporation 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 AS138950 CHINANET jiangsu province network 524,288
221.176.0.0/13 AS132510 China Mobile Communications Corporation 524,288
221.176.0.0/13 AS24445 China Mobile Communications Corporation 524,288
221.176.0.0/13 AS56042 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 AS146966 CHINANET jiangsu province network 524,288
221.176.0.0/13 AS56044 China Mobile Communications Corporation 524,288
221.176.0.0/13 AS141425 China Mobile Communications Corporation 524,288
221.224.0.0/13 AS4809 CHINANET jiangsu province network 524,288
221.176.0.0/13 AS56040 China Mobile Communications Corporation 524,288
221.224.0.0/13 AS4134 CHINANET jiangsu province network 524,288
221.224.0.0/13 AS134770 CHINANET jiangsu province network 524,288
221.176.0.0/13 AS56048 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
221.184.0.0/13 AS4713 NTT DOCOMO BUSINESS,Inc. 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
221.232.0.0/14 AS58563 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
221.200.0.0/14 AS4837 China Unicom Liaoning Province Network 262,144
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
221.130.0.0/15 AS9808 China Mobile Communications Corporation 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
221.116.0.0/16 AS17506 ARTERIA Networks Corporation 65,536
221.117.0.0/16 AS17506 ARTERIA Networks Corporation 65,536
221.168.0.0/16 AS4766 Korea Telecom 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 1,779 domain names hosted across 851 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 durimoa.kr 131
221.156.137.137 sktunion.com 34
221.156.137.135 kffiu.or.kr 24
221.156.137.138 katuobusi.co.kr 14
221.146.177.180 runjeju2024report.com 12
221.157.125.147 gcmarathon.co.kr 11
221.152.146.148 4dayweek.kr 10
221.146.142.41 open2000.co.kr 9
221.157.125.135 finegold.kr 7
221.150.239.81 knna.or.kr 7
221.148.180.40 codel.store 7
221.156.137.102 jlms.or.kr 7
221.146.140.100 hivisiontech.co.kr 6
221.144.57.45 doctorpass.co.kr 6
221.149.101.250 hotelriviera.co.kr 6
221.146.6.184 golfn.me 6
221.155.253.133 storeview.co.kr 6
221.148.146.134 onceyou.kr 5
221.146.70.208 fonts.kr 5
221.155.112.97 007masg.com 5

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

542,145 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address ASN Details
221.159.9.189 AS4766 Korea Telecom 5.58ms from Seoul, KR
221.159.35.65 AS4766 Korea Telecom 4.63ms from Seoul, KR
221.159.2.182 AS4766 Korea Telecom 5.49ms from Seoul, KR
221.159.79.214 AS4766 Korea Telecom 4.79ms from Seoul, KR
221.158.230.122 AS4766 Korea Telecom 5.37ms from Seoul, KR
221.158.159.217 AS4766 Korea Telecom 4.26ms from Seoul, KR
221.159.59.142 AS4766 Korea Telecom 4.28ms from Seoul, KR
221.158.152.157 AS4766 Korea Telecom 3.36ms from Seoul, KR
221.159.80.126 AS4766 Korea Telecom 5.02ms from Seoul, KR
221.159.23.25 AS4766 Korea Telecom 5.48ms from Seoul, KR
221.159.74.134 AS4766 Korea Telecom 5.69ms from Seoul, KR
221.159.38.254 AS4766 Korea Telecom 4.44ms from Seoul, KR
221.159.4.190 AS4766 Korea Telecom 5.40ms from Seoul, KR
221.158.144.58 AS4766 Korea Telecom 5.06ms from Seoul, KR
221.159.105.254 AS4766 Korea Telecom 4.64ms from Seoul, KR
221.158.177.6 AS4766 Korea Telecom 3.42ms from Seoul, KR
221.158.249.151 AS4766 Korea Telecom 5.26ms from Seoul, KR
221.158.247.72 AS4766 Korea Telecom 6.29ms from Seoul, KR
221.159.27.29 AS4766 Korea Telecom 4.77ms from Seoul, KR
221.159.25.254 AS4766 Korea Telecom 4.65ms from Seoul, KR
221.158.194.252 AS4766 Korea Telecom 3.30ms from Seoul, KR
221.159.108.27 AS4766 Korea Telecom 4.14ms from Seoul, KR
221.158.133.140 AS4766 Korea Telecom 4.47ms from Seoul, KR
221.159.55.206 AS4766 Korea Telecom 4.42ms from Seoul, KR
221.158.161.84 AS4766 Korea Telecom 5.51ms 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
92.130.110.220 AS3215 Orange S.A. 16.77ms from Antananarivo, MG
73.213.101.140 AS7922 Comcast Cable Communications, LLC 4.86ms from Ashburn, US
52.234.161.60 AS8075 Microsoft Corporation 0.49ms from Ashburn, US
177.201.85.204 AS8167 V tal 5.31ms from Brasilia, BR
190.3.16.188 AS11664 Techtel LMDS Comunicaciones Interactivas S.A. 0.95ms from Buenos Aires, AR
79.140.182.236 AS12312 ecotel communication ag 4.71ms from Frankfurt am Main, DE
119.142.223.28 AS4134 CHINANET-BACKBONE 11.07ms from Guangzhou, CN
95.90.70.252 AS3209 Vodafone GmbH 2.49ms from Hamburg, DE
85.183.21.108 AS6805 Telefonica Germany GmbH & Co.OHG 4.68ms from Hamburg, DE
14.190.113.140 AS45899 VNPT Corp 2.08ms from Hanoi, VN
110.139.190.28 AS7713 PT Telekomunikasi Indonesia 17.36ms from Jakarta, ID
69.27.134.252 AS27258 KAMO Electric Cooperative, Inc. 0.78ms from Kansas City, US
4.226.7.140 AS8075 Microsoft Corporation 0.19ms from Kloten, CH
134.213.218.12 AS15395 Rackspace Ltd. 1.16ms from London, GB
144.2.163.28 AS203183 FOBOS TELECOM 9.34ms from Madrid, ES
47.206.126.108 AS5650 Frontier Communications of America, Inc. 6.71ms from Miami, US
5.175.66.156 AS29286 SKYLOGIC S.P.A. 1.37ms from Paris, FR
20.69.139.44 AS8075 Microsoft Corporation 0.28ms from Quincy, US
23.84.3.172 AS20115 Charter Communications LLC 5.51ms from St. Louis, US
147.243.101.76 AS8075 Microsoft Corporation 0.33ms from Vienna, AT
188.22.13.204 AS8447 A1 Telekom Austria AG 8.09ms from Vienna, AT
151.245.218.188 AS57043 HOSTKEY B.V. 0.27ms from Amsterdam, NL
176.92.10.44 AS3329 VODAFONE-PANAFON HELLENIC TELECOMMUNICATIONS COMPANY SA 1.52ms from Athens, GR
24.125.65.108 AS7922 Comcast Cable Communications, LLC 4.95ms from Atlanta, US
95.168.63.236 AS8462 Tarr Kft. 10.91ms from Budapest, HU

Traceroute

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

$
traceroute -a -n -q1 -f5 221.158.74.91
traceroute to 221.158.74.91 (221.158.74.91): 64 hops max, 52 byte packets
5 [AS4766] 112.174.101.6 5.229 ms
6 *
7 *
8 [AS4766] 221.158.74.91 5.038 ms
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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