All IP Ranges
221.0.0.0/8
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
221.160.0.0/13	AS4766	Korea Telecom	524,288
221.176.0.0/13	AS56048	China Mobile Communications Corporation	524,288
221.224.0.0/13	AS137697	CHINANET jiangsu province network	524,288
221.224.0.0/13	AS23650	CHINANET jiangsu 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
221.176.0.0/13	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
221.176.0.0/13	AS132510	China Mobile Communications Corporation	524,288
221.224.0.0/13	AS4134	CHINANET jiangsu province network	524,288
221.224.0.0/13	AS140292	CHINANET jiangsu province network	524,288
221.176.0.0/13	AS56042	China Mobile Communications Corporation	524,288
221.224.0.0/13	AS146966	CHINANET jiangsu province network	524,288
221.176.0.0/13	AS24445	China Mobile Communications Corporation	524,288
221.224.0.0/13	AS134770	CHINANET jiangsu province network	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
221.176.0.0/13	AS56044	China Mobile Communications Corporation	524,288
221.176.0.0/13	AS56040	China Mobile Communications Corporation	524,288
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	AS4809	CHINANET jiangsu province network	524,288
221.184.0.0/13	AS4713	NTT DOCOMO BUSINESS,Inc.	524,288
221.124.0.0/14	AS9304	HGC Global Communications Limited	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
221.232.0.0/14	AS58563	CHINANET Hubei province network	262,144
221.232.0.0/14	AS4134	CHINANET Hubei province network	262,144
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
221.130.0.0/15	AS9808	China Mobile Communications Corporation	131,072
221.138.0.0/15	AS9318	SK Broadband Co Ltd	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
221.10.0.0/16	AS4837	China Unicom SiChuan province network	65,536
221.169.0.0/16	AS4780	Digital United I	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
221.206.0.0/16	AS4837	China Unicom Heilongjiang Province Network	65,536
221.137.0.0/16	AS9812	Oriental Cable Network Co., Ltd.	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
221.117.0.0/16	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

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
221.157.242.138	AS4766 Korea Telecom	`6.51ms` from Seoul, KR
221.158.36.65	AS4766 Korea Telecom	`3.37ms` from Seoul, KR
221.157.232.205	AS4766 Korea Telecom	`5.53ms` from Seoul, KR
221.158.7.97	AS4766 Korea Telecom	`3.81ms` from Seoul, KR
221.158.16.1	AS4766 Korea Telecom	`3.25ms` from Seoul, KR
221.158.121.6	AS4766 Korea Telecom	`5.04ms` from Seoul, KR
221.158.27.57	AS4766 Korea Telecom	`3.72ms` from Seoul, KR
221.158.130.11	AS4766 Korea Telecom	`4.23ms` from Seoul, KR
221.158.151.1	AS4766 Korea Telecom	`3.77ms` from Seoul, KR
221.158.14.59	AS4766 Korea Telecom	`3.23ms` from Seoul, KR
221.157.253.47	AS4766 Korea Telecom	`5.58ms` from Seoul, KR
221.158.41.1	AS4766 Korea Telecom	`3.31ms` from Seoul, KR
221.158.62.211	AS4766 Korea Telecom	`4.52ms` from Seoul, KR
221.158.9.129	AS4766 Korea Telecom	`3.26ms` from Seoul, KR
221.157.244.190	AS4766 Korea Telecom	`5.92ms` from Seoul, KR
221.158.17.121	AS4766 Korea Telecom	`3.33ms` from Seoul, KR
221.158.8.64	AS4766 Korea Telecom	`3.23ms` from Seoul, KR
221.158.11.214	AS4766 Korea Telecom	`3.45ms` from Seoul, KR
221.157.231.25	AS4766 Korea Telecom	`5.75ms` from Seoul, KR
221.158.101.121	AS4766 Korea Telecom	`2.99ms` from Seoul, KR
221.157.203.60	AS4766 Korea Telecom	`5.64ms` from Seoul, KR
221.158.149.129	AS4766 Korea Telecom	`2.94ms` from Seoul, KR
221.158.61.1	AS4766 Korea Telecom	`3.32ms` from Seoul, KR
221.158.141.185	AS4766 Korea Telecom	`3.15ms` from Seoul, KR
221.158.12.1	AS4766 Korea Telecom	`3.17ms` 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
185.148.29.220	AS42707 e-Quest IT Projecten B.V.	`1.79ms` from Amsterdam, NL
36.64.108.204	AS7713 PT Telekomunikasi Indonesia	`0.87ms` from Batam, ID
51.68.224.124	AS16276 OVH SAS	`0.15ms` from Gravelines, FR
220.176.39.92	AS4134 CHINANET-BACKBONE	`8.75ms` from Nanchang, CN
207.65.32.188	AS62713 PubMatic, Inc.	`0.59ms` from New York City, US
120.221.88.28	AS24444 Shandong Mobile Communication Company Limited	`0.80ms` from Qingdao, CN
211.115.88.188	AS3786 LG DACOM Corporation	`0.71ms` from Seoul, KR
180.172.159.156	AS4812 China Telecom (Group)	`5.24ms` from Shanghai, CN
206.189.152.220	AS14061 DigitalOcean, LLC	`0.28ms` from Singapore, SG
173.206.12.76	AS6407 Primus Telecommunications Canada Inc.	`6.17ms` from Toronto, CA
94.111.74.188	AS47377 Orange Belgium SA	`14.22ms` from Amsterdam, NL
176.238.56.12	AS16135 Turkcell A.S.	`18.20ms` from Ankara, TR
111.166.85.220	AS4837 CHINA UNICOM China169 Backbone	`5.35ms` from Beijing, CN
52.34.150.76	AS16509 Amazon.com, Inc.	`0.16ms` from Boardman, US
88.132.219.108	AS47159 Celldomolki Kabeltelevizio Kft.	`11.37ms` from Budapest, HU
102.98.91.76	AS36925 MEDITELECOM	`4.33ms` from Casablanca, MA
207.140.129.156	AS7018 AT&T Enterprises, LLC	`9.23ms` from Chicago, US
204.207.249.172	AS7421 Sprint	`0.71ms` from Chicago, US
194.39.62.252	AS3320 Deutsche Telekom AG	`4.79ms` from Duesseldorf, DE
91.66.233.252	AS3209 Vodafone GmbH	`6.10ms` from Frankfurt am Main, DE
59.34.148.76	AS4134 CHINANET-BACKBONE	`10.15ms` from Guangzhou, CN
49.79.121.28	AS4134 CHINANET-BACKBONE	`8.82ms` from Huai'an, CN
196.201.214.76	AS33771 Safaricom Limited	`2.11ms` from Nairobi, KE
88.123.62.124	AS12322 Free SAS	`6.24ms` from Paris, FR
97.215.163.12	AS6167 Verizon Business	`13.69ms` from San Jose, US

Traceroute

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

traceroute -a -n -q1 -m6 221.159.243.177

traceroute to 221.159.243.177 (221.159.243.177): 6 hops max, 52 byte packets

1 [AS15169] 74.125.37.114 100.258 ms

2 *

3 [AS4766] 112.174.84.170 130.024 ms

4 *

5 *

6 *

Measurement taken from

IPinfo ProbeNet in Los Angeles, US

On November 22nd 2025

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