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
221.176.0.0/13	AS9808	China Mobile Communications Corporation	524,288
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	AS56046	China Mobile Communications Corporation	524,288
221.216.0.0/13	AS4808	China Unicom Beijing province network	524,288
221.176.0.0/13	AS56044	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
221.184.0.0/13	AS4713	NTT DOCOMO BUSINESS,Inc.	524,288
221.160.0.0/13	AS4766	Korea Telecom	524,288
221.224.0.0/13	AS23650	CHINANET jiangsu province network	524,288
221.176.0.0/13	AS132510	China Mobile Communications Corporation	524,288
221.176.0.0/13	AS141425	China Mobile Communications Corporation	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
221.224.0.0/13	AS4134	CHINANET jiangsu province network	524,288
221.224.0.0/13	AS131325	CHINANET jiangsu province network	524,288
221.224.0.0/13	AS137702	CHINANET jiangsu province network	524,288
221.224.0.0/13	AS137697	CHINANET jiangsu province network	524,288
221.176.0.0/13	AS139080	China Mobile Communications Corporation	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
221.224.0.0/13	AS146966	CHINANET jiangsu province network	524,288
221.224.0.0/13	AS134756	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
221.200.0.0/14	AS4837	China Unicom Liaoning Province Network	262,144
221.124.0.0/14	AS9304	HGC Global Communications Limited	262,144
221.130.0.0/15	AS56042	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
221.130.0.0/15	AS9808	China Mobile Communications Corporation	131,072
221.204.0.0/15	AS4837	China Unicom Shanxi Province Network	131,072
221.8.0.0/15	AS4837	China Unicom JILIN province network	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
221.168.0.0/16	AS4766	Korea Telecom	65,536
221.116.0.0/16	AS17506	ARTERIA Networks Corporation	65,536
221.117.0.0/16	AS17506	ARTERIA Networks Corporation	65,536
221.115.0.0/16	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 1,776 domain names hosted across 840 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	mydocu.kr	129
221.148.143.109	kdtop.co.kr	110
221.156.137.137	lsmunion.co.kr	34
221.149.135.231	desco.co.kr	31
221.148.193.72	flandersdog.com	27
221.147.192.243	ceoclub.or.kr	24
221.144.12.64	massagejob.kr	15
221.156.137.138	kpnojo.or.kr	14
221.150.76.99	orientgenia.com	13
221.150.239.84	chahealthcare.co.kr	13
221.146.177.180	adtseoul.com	12
221.150.239.83	scro.co.kr	11
221.156.137.103	anffis.co.kr	11
221.157.125.147	bonghwarun.kr	11
221.152.146.148	cheongplant.com	10
221.144.86.1	xn--om3bv0hite4qt.com	9
221.157.125.140	goldchain.co.kr	9
221.155.253.133	360tour.kr	9
221.146.142.41	babysos.co.kr	9
221.151.187.148	ctaskpy.org	8

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

540,093 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address	ASN	Details
221.153.208.8	AS4766 Korea Telecom	`1.90ms` from Seoul, KR
221.153.194.241	AS4766 Korea Telecom	`1.34ms` from Seoul, KR
221.153.155.1	AS4766 Korea Telecom	`1.49ms` from Seoul, KR
221.153.214.50	AS4766 Korea Telecom	`1.98ms` from Seoul, KR
221.153.103.145	AS4766 Korea Telecom	`1.35ms` from Seoul, KR
221.153.203.116	AS4766 Korea Telecom	`1.31ms` from Seoul, KR
221.153.205.241	AS4766 Korea Telecom	`1.44ms` from Seoul, KR
221.153.74.171	AS4766 Korea Telecom	`1.48ms` from Seoul, KR
221.153.116.14	AS4766 Korea Telecom	`1.59ms` from Seoul, KR
221.153.105.116	AS4766 Korea Telecom	`1.46ms` from Seoul, KR
221.153.125.210	AS4766 Korea Telecom	`1.97ms` from Seoul, KR
221.153.183.2	AS4766 Korea Telecom	`2.06ms` from Seoul, KR
221.153.100.1	AS4766 Korea Telecom	`1.27ms` from Seoul, KR
221.153.114.106	AS4766 Korea Telecom	`1.65ms` from Seoul, KR
221.153.50.140	AS4766 Korea Telecom	`1.44ms` from Seoul, KR
221.153.147.81	AS4766 Korea Telecom	`1.59ms` from Seoul, KR
221.153.72.31	AS4766 Korea Telecom	`1.58ms` from Seoul, KR
221.153.199.98	AS4766 Korea Telecom	`2.06ms` from Seoul, KR
221.153.188.81	AS4766 Korea Telecom	`1.42ms` from Seoul, KR
221.153.14.23	AS4766 Korea Telecom	`1.60ms` from Seoul, KR
221.153.185.64	AS4766 Korea Telecom	`1.43ms` from Seoul, KR
221.153.148.221	AS4766 Korea Telecom	`1.42ms` from Seoul, KR
221.153.76.185	AS4766 Korea Telecom	`1.39ms` from Seoul, KR
221.153.32.99	AS4766 Korea Telecom	`2.48ms` from Seoul, KR
221.153.162.151	AS4766 Korea Telecom	`2.59ms` 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
24.247.122.124	AS20115 Charter Communications LLC	`9.97ms` from Chicago, US
119.147.154.12	AS134763 CHINANET Guangdong province network	`2.70ms` from Guangzhou, CN
47.75.146.204	AS45102 Alibaba (US) Technology Co., Ltd.	`1.32ms` from Hong Kong, HK
125.16.122.124	AS9498 BHARTI Airtel Ltd.	`0.88ms` from Hyderabad, IN
109.62.8.108	AS20776 Outremer Telecom SAS	`0.72ms` from Le Lamentin, MQ
134.213.218.12	AS15395 Rackspace Ltd.	`1.15ms` from London, GB
193.237.184.108	AS5378 Vodafone Limited	`4.36ms` from London, GB
174.92.222.204	AS577 Bell Canada	`1.42ms` from Montreal, CA
126.85.164.172	AS17676 SoftBank Corp.	`10.72ms` from Osaka, JP
88.123.62.124	AS12322 Free SAS	`6.27ms` from Paris, FR
18.204.166.204	AS14618 Amazon.com, Inc.	`0.17ms` from Reston, US
131.226.216.204	AS12213 Centersquare	`0.53ms` from San Jose, US
166.108.102.76	AS30103 Zoom Video Communications, Inc	`0.66ms` from San Jose, US
116.46.78.252	AS17858 LG POWERCOMM	`3.31ms` from Seoul, KR
195.200.29.188	AS216071 SERVERS TECH FZCO	`0.57ms` from Amsterdam, NL
190.173.246.188	AS22927 Telefonica de Argentina	`10.05ms` from Buenos Aires, AR
208.54.86.44	AS21928 T-Mobile USA, Inc.	`0.99ms` from Dallas, US
71.204.157.60	AS7922 Comcast Cable Communications, LLC	`3.22ms` from Fremont, US
188.193.104.252	AS3209 Vodafone GmbH	`3.06ms` from Hamburg, DE
47.52.214.124	AS45102 Alibaba (US) Technology Co., Ltd.	`1.30ms` from Hong Kong, HK
190.106.250.76	AS27839 Comteco Ltda	`5.01ms` from La Paz, BO
188.199.131.124	AS5603 Telekom Slovenije, d.d.	`9.62ms` from Ljubljana, SI
196.201.214.76	AS33771 Safaricom Limited	`2.08ms` from Nairobi, KE
67.87.221.252	AS6128 Cablevision Systems Corp.	`7.11ms` from Piscataway, US
54.147.111.60	AS14618 Amazon.com, Inc.	`0.20ms` from Reston, US

Traceroute

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

traceroute -a -n -q1 -f5 -m13 221.154.83.116

traceroute to 221.154.83.116 (221.154.83.116): 13 hops max, 52 byte packets

5 [AS6939] 64.71.165.22 5.906 ms

6 [AS4766] 112.174.88.213 120.323 ms

7 [AS4766] 112.174.86.129 127.367 ms

8 [AS4766] 112.174.47.18 128.887 ms

9 *

10 [AS4766] 121.172.172.62 142.966 ms

11 *

12 *

13 *

Measurement taken from

IPinfo ProbeNet in Fremont, US

On November 28th 2025

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