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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
221.64.0.0/11 AS17676 Japan Nation-wide Network of Softbank Corp. 2,097,152
221.48.0.0/12 AS17676 Japan Nation-wide Network of Softbank Corp. 1,048,576
221.240.0.0/12 AS17506 ARTERIA Networks Corporation 1,048,576
221.96.0.0/12 AS17676 Japan Nation-wide Network of Softbank Corp. 1,048,576
221.16.0.0/12 AS17676 Japan Nation-wide Network of Softbank Corp. 1,048,576
221.176.0.0/13 AS9808 China Mobile Communications Corporation 524,288
221.224.0.0/13 AS137702 CHINANET jiangsu province network 524,288
221.224.0.0/13 AS4134 CHINANET jiangsu province network 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
221.184.0.0/13 AS4713 NTT DOCOMO BUSINESS,Inc. 524,288
221.176.0.0/13 AS132510 China Mobile Communications Corporation 524,288
221.176.0.0/13 AS56044 China Mobile Communications Corporation 524,288
221.176.0.0/13 AS56048 China Mobile Communications Corporation 524,288
221.176.0.0/13 AS56042 China Mobile Communications Corporation 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
221.216.0.0/13 AS4808 China Unicom Beijing province network 524,288
221.160.0.0/13 AS4766 Korea Telecom 524,288
221.224.0.0/13 AS134756 CHINANET jiangsu province network 524,288
221.224.0.0/13 AS146966 CHINANET jiangsu province network 524,288
221.224.0.0/13 AS134770 CHINANET jiangsu province network 524,288
221.224.0.0/13 AS137697 CHINANET jiangsu province network 524,288
221.176.0.0/13 AS141425 China Mobile Communications Corporation 524,288
221.32.0.0/13 AS17676 Japan Nation-wide Network of Softbank Corp. 524,288
221.176.0.0/13 AS139080 China Mobile Communications Corporation 524,288
221.224.0.0/13 AS140292 CHINANET jiangsu province network 524,288
221.176.0.0/13 AS24445 China Mobile Communications Corporation 524,288
221.176.0.0/13 AS56040 China Mobile Communications Corporation 524,288
221.176.0.0/13 AS56046 China Mobile Communications Corporation 524,288
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
221.232.0.0/14 AS58563 CHINANET Hubei province network 262,144
221.232.0.0/14 AS58777 CHINANET Hubei province network 262,144
221.124.0.0/14 AS9304 HGC Global Communications Limited 262,144
221.40.0.0/14 AS17676 Japan Nation-wide Network of Softbank Corp. 262,144
221.170.0.0/15 AS2518 BIGLOBE Inc. 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
221.130.0.0/15 AS56042 China Mobile Communications Corporation 131,072
221.130.0.0/15 AS56041 China Mobile Communications Corporation 131,072
221.44.0.0/15 AS17676 Japan Nation-wide Network of Softbank Corp. 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

Hosted domains

There are 1,815 domain names hosted across 884 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address Domain Domains on this IP

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

534,013 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address ASN Details
221.145.168.173 AS4766 Korea Telecom 3.33ms from Incheon, KR
221.145.206.37 AS4766 Korea Telecom 3.30ms from Seoul, KR
221.145.135.107 AS4766 Korea Telecom 5.21ms from Seoul, KR
221.145.198.1 AS4766 Korea Telecom 3.84ms from Seoul, KR
221.145.111.44 AS4766 Korea Telecom 1.36ms from Seoul, KR
221.145.245.243 AS4766 Korea Telecom 3.28ms from Seoul, KR
221.145.157.18 AS4766 Korea Telecom 4.57ms from Seoul, KR
221.146.6.254 AS4766 Korea Telecom 1.53ms from Seoul, KR
221.146.25.94 AS4766 Korea Telecom 1.45ms from Seoul, KR
221.145.117.59 AS4766 Korea Telecom 1.56ms from Seoul, KR
221.145.205.41 AS4766 Korea Telecom 3.55ms from Seoul, KR
221.146.10.145 AS4766 Korea Telecom 1.56ms from Seoul, KR
221.146.30.142 AS4766 Korea Telecom 1.45ms from Seoul, KR
221.146.23.3 AS4766 Korea Telecom 1.19ms from Seoul, KR
221.145.167.6 AS4766 Korea Telecom 4.73ms from Seoul, KR
221.145.190.207 AS4766 Korea Telecom 5.26ms from Seoul, KR
221.145.152.161 AS4766 Korea Telecom 4.19ms from Seoul, KR
221.145.225.42 AS4766 Korea Telecom 2.67ms from Seoul, KR
221.145.134.241 AS4766 Korea Telecom 5.81ms from Seoul, KR
221.145.202.107 AS4766 Korea Telecom 3.59ms from Seoul, KR
221.146.0.146 AS4766 Korea Telecom 1.53ms from Seoul, KR
221.145.101.92 AS4766 Korea Telecom 1.60ms from Seoul, KR
221.146.14.234 AS4766 Korea Telecom 1.53ms from Seoul, KR
221.145.103.254 AS4766 Korea Telecom 1.51ms from Seoul, KR
221.145.125.76 AS4766 Korea Telecom 1.30ms 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
222.154.68.28 AS4771 Spark New Zealand Trading Ltd. 6.31ms from Auckland, NZ
23.194.46.204 AS38040 TOT Public Company Limited 1.05ms from Bangkok, TH
101.23.139.204 AS4837 CHINA UNICOM China169 Backbone 15.44ms from Beijing, CN
35.166.196.220 AS16509 Amazon.com, Inc. 0.17ms from Boardman, US
186.98.67.76 AS3816 COLOMBIA TELECOMUNICACIONES S.A. ESP BIC 2.41ms from Bogota, CO
190.177.238.92 AS22927 Telefonica de Argentina 1.65ms from Buenos Aires, AR
95.90.70.252 AS3209 Vodafone GmbH 2.52ms from Hamburg, DE
117.4.138.188 AS7552 Viettel Group 4.58ms from Hanoi, VN
90.190.119.188 AS3249 Telia Eesti AS 3.02ms from Jõhvi, EE
54.147.111.60 AS14618 Amazon.com, Inc. 0.20ms from Reston, US
91.203.161.252 AS47467 Griffel AB 0.54ms from Växjö, SE
221.232.11.28 AS4134 CHINANET-BACKBONE 2.64ms from Wuhan, CN
144.217.240.76 AS16276 OVH SAS 0.13ms from Beauharnois, CA
141.30.228.28 AS680 Verein zur Foerderung eines Deutschen Forschungsnetzes e.V. 3.41ms from Berlin, DE
74.125.140.108 AS15169 Google LLC 0.21ms from Brussels, BE
108.253.242.44 AS7018 AT&T Enterprises, LLC 6.55ms from Dallas, US
194.39.62.252 AS3320 Deutsche Telekom AG 4.80ms from Duesseldorf, DE
64.34.85.124 AS396356 Latitude.sh 0.19ms from Frankfurt am Main, DE
176.224.7.60 AS35819 Etihad Etisalat, a joint stock company 3.82ms from Jeddah, SA
105.216.111.60 AS16637 MTN SA 4.20ms from Johannesburg, ZA
79.126.16.236 AS12389 PJSC Rostelecom 6.37ms from Kazan, RU
73.205.157.92 AS7922 Comcast Cable Communications, LLC 8.61ms from Miami, US
87.15.238.172 AS3269 Telecom Italia S.p.A. 9.18ms from Milan, IT
37.235.210.220 AS41268 Sesameware FZ-LLC 8.56ms from Moscow, RU
108.60.236.28 AS8014 Bahamas Telecommunications Corporation 2.88ms from Nassau, BS

Traceroute

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

$
traceroute -a -n -q1 221.151.205.226
traceroute to 221.151.205.226 (221.151.205.226): 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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