All IP Ranges
221.0.0.0/8
AS4766 | 221.152.0.0/13

221.152.0.0/13

AS4766 · Korea Telecom

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Summary

Country	South Korea
Domain	kt.com
ASN	AS4766
Parent Range	221.144.0.0/12
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 contain 221.152.0.0/13

Range	ASN	Company	Num of IPs
221.144.0.0/12	AS9856	Korea Telecom	1,048,576
221.144.0.0/12	AS4766	Korea Telecom	1,048,576
221.144.0.0/12	AS152214	Korea Telecom	1,048,576

BGP prefixes that are contained by 221.152.0.0/13

Range	ASN	Company	Num of IPs
221.159.187.0/24	AS4766	Jeonjubijeondaehak	256
221.159.210.0/24	AS55622	Chuncheongyoyukdaehak	256
221.158.73.0/24	AS17576	Jaedanbeopin hangukyeongujaedan	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
221.157.127.0/24	AS4766	Gyeongbukgwahakdaehakgyo	256
221.159.130.0/24	AS4766	Jeonbukdaehakgyo pyeongsaenggyoyukwon	256
221.159.186.0/24	AS4766	Jeonjubijeondaehak	256

Nearby Ranges

BGP prefixes that overlap with 221.0.0.0/8

Range	ASN	Company	Num of IPs
221.144.0.0/12	AS152214	Korea Telecom	1,048,576
221.144.0.0/12	AS4766	Korea Telecom	1,048,576
221.240.0.0/12	AS17506	ARTERIA Networks Corporation	1,048,576
221.144.0.0/12	AS9856	Korea Telecom	1,048,576
221.224.0.0/13	AS4134	CHINANET jiangsu province network	524,288
221.160.0.0/13	AS4766	Korea Telecom	524,288
221.176.0.0/13	AS139080	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	AS9808	China Mobile Communications Corporation	524,288
221.184.0.0/13	AS4713	NTT DOCOMO BUSINESS,Inc.	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
221.224.0.0/13	AS134770	CHINANET jiangsu province network	524,288
221.224.0.0/13	AS23650	CHINANET jiangsu province network	524,288
221.176.0.0/13	AS56044	China Mobile Communications Corporation	524,288
221.176.0.0/13	AS56046	China Mobile Communications Corporation	524,288
221.176.0.0/13	AS24445	China Mobile Communications Corporation	524,288
221.224.0.0/13	AS134756	CHINANET jiangsu province network	524,288
221.176.0.0/13	AS56040	China Mobile Communications Corporation	524,288
221.176.0.0/13	AS141425	China Mobile Communications Corporation	524,288
221.176.0.0/13	AS132510	China Mobile Communications Corporation	524,288
221.224.0.0/13	AS4809	CHINANET jiangsu province network	524,288
221.224.0.0/13	AS146966	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
221.224.0.0/13	AS140292	CHINANET jiangsu province network	524,288
221.216.0.0/13	AS4808	China Unicom Beijing 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
221.232.0.0/14	AS58777	CHINANET Hubei province network	262,144
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	AS56041	China Mobile Communications Corporation	131,072
221.130.0.0/15	AS9808	China Mobile Communications Corporation	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
221.117.0.0/16	AS17506	ARTERIA Networks Corporation	65,536

Hosted domains

There are 720 domain names hosted across 330 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	richgo.kr	131
221.156.137.138	kimtaehwan.org	14
221.156.152.185	namusup.com	8
221.156.137.102	ldb.or.kr	7
221.152.133.203	songwol-mall.com	5
221.155.112.97	msgs.kr	5
221.157.125.130	omniherb.co.kr	5
221.154.161.76	xn--lu5bv5y.com	4
221.157.239.2	psmh.kr	4
221.153.209.246	archivement.com	4
221.155.158.12	yahokids.kr	3
221.158.29.2	petnoorim.com	3
221.153.6.251	futuremobile.net	3
221.153.36.241	xn--ob0bxi88ly0jowblqha413xcfx83b.xn--3e0b707e	3
221.156.137.136	hlssu.or.kr	3
221.159.102.58	classign.co.kr	3
221.156.110.248	hwan.cloud	2
221.156.241.86	snaptoonwarehouse.com	2
221.159.106.234	forhackathon.site	2
221.154.98.205	kdccl.com	2

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

302,742 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address	ASN	Details
221.158.109.77	AS4766 Korea Telecom	`3.02ms` from Seoul, KR
221.158.245.208	AS4766 Korea Telecom	`5.00ms` from Seoul, KR
221.158.167.28	AS4766 Korea Telecom	`5.12ms` from Seoul, KR
221.158.211.251	AS4766 Korea Telecom	`3.56ms` from Seoul, KR
221.158.14.59	AS4766 Korea Telecom	`3.55ms` from Seoul, KR
221.158.225.180	AS4766 Korea Telecom	`4.40ms` from Seoul, KR
221.158.79.26	AS4766 Korea Telecom	`3.55ms` from Seoul, KR
221.158.231.129	AS4766 Korea Telecom	`4.69ms` from Seoul, KR
221.158.65.213	AS4766 Korea Telecom	`3.30ms` from Seoul, KR
221.158.97.1	AS4766 Korea Telecom	`5.81ms` from Seoul, KR
221.158.151.1	AS4766 Korea Telecom	`3.91ms` from Seoul, KR
221.158.100.129	AS4766 Korea Telecom	`2.98ms` from Seoul, KR
221.158.50.30	AS4766 Korea Telecom	`3.37ms` from Seoul, KR
221.158.51.74	AS4766 Korea Telecom	`6.69ms` from Seoul, KR
221.158.115.1	AS4766 Korea Telecom	`4.85ms` from Seoul, KR
221.158.135.129	AS4766 Korea Telecom	`5.00ms` from Seoul, KR
221.158.27.209	AS4766 Korea Telecom	`3.91ms` from Seoul, KR
221.158.98.135	AS4766 Korea Telecom	`3.60ms` from Seoul, KR
221.158.143.199	AS4766 Korea Telecom	`3.52ms` from Seoul, KR
221.158.67.115	AS4766 Korea Telecom	`4.27ms` from Seoul, KR
221.158.52.51	AS4766 Korea Telecom	`3.24ms` from Seoul, KR
221.157.255.114	AS4766 Korea Telecom	`6.29ms` from Seoul, KR
221.158.28.75	AS4766 Korea Telecom	`3.16ms` from Seoul, KR
221.158.162.185	AS4766 Korea Telecom	`5.31ms` from Seoul, KR
221.158.19.141	AS4766 Korea Telecom	`3.42ms` 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
194.109.11.77	AS3265 KPN B.V.	`0.62ms` from Amsterdam, NL
154.177.97.253	AS8452 TE-AS	`7.64ms` from Cairo, EG
35.228.122.221	AS396982 Google LLC	`0.15ms` from Hamina, FI
188.52.6.205	AS25019 Saudi Telecom Company JSC	`12.94ms` from Jeddah, SA
195.99.82.45	AS2856 British Telecommunications PLC	`0.79ms` from London, GB
75.85.212.189	AS20001 Charter Communications Inc	`9.54ms` from Los Angeles, US
12.54.119.221	AS7018 AT&T Enterprises, LLC	`3.13ms` from Los Angeles, US
189.251.167.109	AS8151 UNINET	`2.42ms` from Mexico City, MX
95.191.91.29	AS12389 PJSC Rostelecom	`17.06ms` from Moscow, RU
91.243.251.61	AS47531 GorPTUs OOO	`10.25ms` from Moscow, RU
39.85.250.237	AS4837 CHINA UNICOM China169 Backbone	`8.21ms` from Qingdao, CN
61.2.58.125	AS9829 National Internet Backbone	`8.95ms` from Saint Thomas Mount, IN
14.53.85.29	AS4766 Korea Telecom	`1.59ms` from Seoul, KR
121.133.65.157	AS4766 Korea Telecom	`1.57ms` from Seoul, KR
212.37.6.61	AS12552 GlobalConnect AB	`0.43ms` from Stockholm, SE
99.227.59.61	AS812 Rogers Communications Canada Inc.	`4.36ms` from Toronto, CA
44.208.223.141	AS14618 Amazon.com, Inc.	`0.54ms` from Ashburn, US
44.211.197.189	AS14618 Amazon.com, Inc.	`0.52ms` from Ashburn, US
3.231.139.173	AS14618 Amazon.com, Inc.	`0.52ms` from Ashburn, US
84.37.215.205	AS22773 Cox Communications Inc.	`2.16ms` from Ashburn, US
223.70.193.125	AS56048 China Mobile Communicaitons Corporation	`1.08ms` from Beijing, CN
88.251.45.157	AS9121 Turk Telekomunikasyon Anonim Sirketi	`14.89ms` from Bursa, TR
107.134.87.13	AS7018 AT&T Enterprises, LLC	`17.83ms` from Chicago, US
69.67.67.253	AS13745 Ventus Networks, LLC	`0.42ms` from Dallas, US
94.202.37.173	AS15802 Emirates Integrated Telecommunications Company PJSC	`2.83ms` from Dubai, AE

Traceroute

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

traceroute -a -n -q1 221.159.220.137

traceroute to 221.159.220.137 (221.159.220.137): 64 hops max, 52 byte packets

1 [AS15169] 172.253.64.138 1.606 ms

2 *

3 *

4 *

5 *

6 [AS4766] 112.189.207.26 24.374 ms

7 [AS4766] 221.159.220.137 7.005 ms

Measurement taken from

IPinfo ProbeNet in Seoul, KR

On December 28th 2025

What are IP address ranges?

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