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

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	AS56040	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
221.176.0.0/13	AS56044	China Mobile Communications Corporation	524,288
221.176.0.0/13	AS56046	China Mobile Communications Corporation	524,288
221.224.0.0/13	AS4809	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
221.176.0.0/13	AS9808	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
221.160.0.0/13	AS4766	Korea Telecom	524,288
221.224.0.0/13	AS23650	CHINANET jiangsu province network	524,288
221.224.0.0/13	AS134756	CHINANET jiangsu province network	524,288
221.160.0.0/13	AS9780	Korea Telecom	524,288
221.160.0.0/13	AS131101	Korea Telecom	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	AS138950	CHINANET jiangsu province network	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	AS132510	China Mobile Communications Corporation	524,288
221.184.0.0/13	AS4713	NTT DOCOMO BUSINESS,Inc.	524,288
221.160.0.0/13	AS18323	Korea Telecom	524,288
221.160.0.0/13	AS38422	Korea Telecom	524,288
221.160.0.0/13	AS9631	Korea Telecom	524,288
221.224.0.0/13	AS146966	CHINANET jiangsu province network	524,288
221.176.0.0/13	AS141425	China Mobile Communications Corporation	524,288
221.216.0.0/13	AS4808	China Unicom Beijing province network	524,288
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
221.140.0.0/14	AS38695	SK Broadband Co Ltd	262,144
221.140.0.0/14	AS131812	SK Broadband Co Ltd	262,144

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
221.155.23.51	AS4766 Korea Telecom	`1.44ms` from Seoul, KR
221.155.39.126	AS4766 Korea Telecom	`1.93ms` from Seoul, KR
221.155.79.92	AS4766 Korea Telecom	`2.21ms` from Seoul, KR
221.155.78.114	AS4766 Korea Telecom	`1.54ms` from Seoul, KR
221.154.180.147	AS4766 Korea Telecom	`1.25ms` from Seoul, KR
221.154.195.144	AS4766 Korea Telecom	`1.24ms` from Seoul, KR
221.155.57.140	AS4766 Korea Telecom	`1.52ms` from Seoul, KR
221.155.50.130	AS4766 Korea Telecom	`1.56ms` from Seoul, KR
221.155.0.24	AS4766 Korea Telecom	`1.30ms` from Seoul, KR
221.154.225.28	AS4766 Korea Telecom	`1.51ms` from Seoul, KR
221.155.41.52	AS4766 Korea Telecom	`1.46ms` from Seoul, KR
221.155.84.254	AS4766 Korea Telecom	`1.55ms` from Seoul, KR
221.155.18.241	AS4766 Korea Telecom	`1.50ms` from Seoul, KR
221.155.82.31	AS4766 Korea Telecom	`1.79ms` from Seoul, KR
221.154.252.69	AS4766 Korea Telecom	`1.41ms` from Seoul, KR
221.154.228.32	AS4766 Korea Telecom	`1.41ms` from Seoul, KR
221.155.22.18	AS4766 Korea Telecom	`1.52ms` from Seoul, KR
221.155.15.5	AS4766 Korea Telecom	`1.72ms` from Seoul, KR
221.155.49.103	AS4766 Korea Telecom	`1.50ms` from Seoul, KR
221.155.12.254	AS4766 Korea Telecom	`1.74ms` from Seoul, KR
221.155.96.30	AS4766 Korea Telecom	`1.72ms` from Seoul, KR
221.154.212.4	AS4766 Korea Telecom	`1.24ms` from Seoul, KR
221.154.230.235	AS4766 Korea Telecom	`1.28ms` from Seoul, KR
221.154.244.1	AS4766 Korea Telecom	`1.69ms` from Seoul, KR
221.155.86.207	AS4766 Korea Telecom	`1.27ms` 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
139.180.126.172	AS55850 Mercury NZ Limited	`1.38ms` from Auckland, NZ
217.250.164.76	AS3320 Deutsche Telekom AG	`5.47ms` from Frankfurt am Main, DE
112.89.160.76	AS17816 China Unicom IP network China169 Guangdong province	`5.17ms` from Guangzhou, CN
24.167.16.140	AS11427 Charter Communications Inc	`12.44ms` from Houston, US
104.37.221.60	AS393640 Otava, LLC	`0.67ms` from Indianapolis, US
123.233.17.124	AS4837 CHINA UNICOM China169 Backbone	`2.36ms` from Jinan, CN
181.140.237.124	AS13489 UNE EPM TELECOMUNICACIONES S.A.	`8.58ms` from Medellin, CO
199.231.105.252	AS16908 Advanced Technologies Research Group, Inc.	`0.33ms` from New York City, US
90.26.72.124	AS3215 Orange S.A.	`1.33ms` from Paris, FR
92.133.45.252	AS3215 Orange S.A.	`9.32ms` from Paris, FR
163.192.50.12	AS31898 Oracle Corporation	`0.21ms` from San Jose, US
176.238.56.12	AS16135 Turkcell A.S.	`18.20ms` from Ankara, TR
75.91.66.60	AS7029 Windstream Communications LLC	`14.23ms` from Atlanta, US
95.86.157.124	AS34876 smart systems	`1.53ms` from Baku, AZ
190.174.107.236	AS22927 Telefonica de Argentina	`2.63ms` from Buenos Aires, AR
169.53.35.60	AS36351 IBM Cloud	`0.96ms` from Dallas, US
93.187.60.252	AS48097 nobilia-Werke J. Stickling GmbH & Co. KG	`13.15ms` from Duesseldorf, 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
174.4.94.140	AS6327 Shaw Communications	`4.49ms` from Kelowna, CA
202.184.61.60	AS9930 TTNET-MY	`1.66ms` from Kuala Lumpur, MY
190.223.63.236	AS12252 America Movil Peru S.A.C.	`0.76ms` from Lima, PE
114.162.204.252	AS4713 NTT DOCOMO BUSINESS,Inc.	`17.67ms` from Tokyo, JP
153.189.162.108	AS4713 NTT DOCOMO BUSINESS,Inc.	`2.87ms` from Tokyo, JP
188.22.13.204	AS8447 A1 Telekom Austria AG	`9.09ms` from Vienna, AT

Traceroute

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

traceroute -a -n -q1 -f7 221.158.34.251

traceroute to 221.158.34.251 (221.158.34.251): 64 hops max, 52 byte packets

7 [AS4766] 112.174.117.86 3.704 ms

8 [AS4766] 112.188.145.74 4.363 ms

9 *

10 [AS4766] 221.158.34.251 4.042 ms

Measurement taken from

IPinfo ProbeNet in Seoul, KR

On November 22nd 2025

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