All IP Ranges
221.0.0.0/8
AS4766 | 221.144.0.0/12

221.144.0.0/12

AS4766 · Korea Telecom

Need more data or want to access it via API or data downloads? Sign up to get free access

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
221.160.0.0/13	AS9780	Korea Telecom	524,288
221.160.0.0/13	AS9631	Korea Telecom	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
221.176.0.0/13	AS56044	China Mobile Communications Corporation	524,288
221.176.0.0/13	AS56042	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	AS4134	CHINANET jiangsu province network	524,288
221.224.0.0/13	AS138950	CHINANET jiangsu province network	524,288
221.224.0.0/13	AS131325	CHINANET jiangsu province network	524,288
221.224.0.0/13	AS134770	CHINANET jiangsu province network	524,288
221.160.0.0/13	AS4766	Korea Telecom	524,288
221.224.0.0/13	AS4809	CHINANET jiangsu province network	524,288
221.224.0.0/13	AS134756	CHINANET jiangsu province network	524,288
221.176.0.0/13	AS24445	China Mobile Communications Corporation	524,288
221.184.0.0/13	AS4713	NTT DOCOMO BUSINESS,Inc.	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
221.160.0.0/13	AS18323	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
221.160.0.0/13	AS38422	Korea Telecom	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
221.224.0.0/13	AS146966	CHINANET jiangsu province network	524,288
221.176.0.0/13	AS141425	China Mobile Communications Corporation	524,288
221.160.0.0/13	AS131101	Korea Telecom	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
221.232.0.0/14	AS58563	CHINANET Hubei province network	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
221.145.165.1	AS4766 Korea Telecom	`5.33ms` from Seoul, KR
221.146.2.185	AS4766 Korea Telecom	`0.99ms` from Seoul, KR
221.145.216.100	AS4766 Korea Telecom	`4.07ms` from Seoul, KR
221.145.162.81	AS4766 Korea Telecom	`4.79ms` from Seoul, KR
221.145.147.66	AS4766 Korea Telecom	`4.73ms` from Seoul, KR
221.146.13.224	AS4766 Korea Telecom	`1.37ms` from Seoul, KR
221.146.32.193	AS4766 Korea Telecom	`1.48ms` from Seoul, KR
221.146.31.218	AS4766 Korea Telecom	`1.35ms` from Seoul, KR
221.145.111.19	AS4766 Korea Telecom	`1.23ms` from Seoul, KR
221.145.135.6	AS4766 Korea Telecom	`5.45ms` from Seoul, KR
221.145.159.1	AS4766 Korea Telecom	`4.20ms` from Seoul, KR
221.145.154.209	AS4766 Korea Telecom	`4.88ms` from Seoul, KR
221.145.115.126	AS4766 Korea Telecom	`1.53ms` from Seoul, KR
221.145.129.188	AS4766 Korea Telecom	`5.50ms` from Seoul, KR
221.145.183.69	AS4766 Korea Telecom	`2.89ms` from Seoul, KR
221.146.26.210	AS4766 Korea Telecom	`1.34ms` from Seoul, KR
221.145.171.245	AS4766 Korea Telecom	`3.56ms` from Seoul, KR
221.145.181.75	AS4766 Korea Telecom	`3.77ms` from Seoul, KR
221.146.19.38	AS4766 Korea Telecom	`1.02ms` from Seoul, KR
221.145.189.129	AS4766 Korea Telecom	`4.94ms` from Seoul, KR
221.145.248.142	AS4766 Korea Telecom	`3.33ms` from Seoul, KR
221.146.33.3	AS4766 Korea Telecom	`1.45ms` from Seoul, KR
221.145.130.161	AS4766 Korea Telecom	`5.31ms` from Seoul, KR
221.145.125.115	AS4766 Korea Telecom	`1.55ms` from Seoul, KR
221.145.107.62	AS4766 Korea Telecom	`1.44ms` 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
36.64.108.204	AS7713 PT Telekomunikasi Indonesia	`0.87ms` from Batam, ID
35.166.196.220	AS16509 Amazon.com, Inc.	`0.15ms` from Boardman, US
175.22.67.188	AS4837 CHINA UNICOM China169 Backbone	`3.53ms` from Changchun, CN
217.80.207.188	AS3320 Deutsche Telekom AG	`3.20ms` from Frankfurt am Main, DE
113.167.125.12	AS45899 VNPT Corp	`5.97ms` from Hanoi, VN
185.173.114.60	AS51522 ONLINE LLC	`12.83ms` from Krasnodar, RU
134.213.218.12	AS15395 Rackspace Ltd.	`1.16ms` from London, GB
172.114.115.236	AS20001 Charter Communications Inc	`4.36ms` from Los Angeles, US
80.27.215.140	AS3352 TELEFONICA DE ESPANA S.A.U.	`17.33ms` from Madrid, ES
5.40.212.140	AS6739 VODAFONE ONO, S.A.	`8.38ms` from Madrid, ES
72.185.149.76	AS33363 Charter Communications, Inc	`9.46ms` from Orlando, US
115.37.28.92	AS18126 Chubu Telecommunications Company, Inc.	`4.10ms` from Osaka, JP
68.98.229.92	AS22773 Cox Communications Inc.	`1.86ms` from Phoenix, US
14.72.48.28	AS4766 Korea Telecom	`1.18ms` from Seoul, KR
85.230.20.172	AS8434 Telenor Sverige AB	`3.89ms` from Stockholm, SE
178.42.214.188	AS5617 Orange Polska Spolka Akcyjna	`2.96ms` from Warsaw, PL
178.225.124.140	AS31615 Odido Netherlands B.V.	`11.45ms` from Amsterdam, NL
51.8.76.172	AS8075 Microsoft Corporation	`0.41ms` from Ashburn, US
187.53.35.172	AS8167 V tal	`5.18ms` from Brasilia, BR
78.166.195.188	AS47331 TTNet A.S.	`13.26ms` from Bursa, TR
142.251.186.108	AS15169 Google LLC	`0.33ms` from Dallas, US
85.183.21.108	AS6805 Telefonica Germany GmbH & Co.OHG	`4.76ms` from Hamburg, DE
84.91.125.12	AS13156 NOWO COMMUNICATIONS, S.A.	`8.80ms` from Lisbon, PT
130.93.152.92	AS25540 Alphalink SASU	`0.54ms` from Paris, FR
81.167.206.188	AS29695 Altibox AS	`9.42ms` from Sandefjord, NO

Traceroute

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

traceroute -a -n -q1 221.154.238.5

traceroute to 221.154.238.5 (221.154.238.5): 64 hops max, 52 byte packets

1 [AS15169] 172.253.64.138 0.958 ms

2 *

3 *

4 [AS4766] 112.174.57.62 2.641 ms

5 *

6 [AS4766] 112.190.99.42 3.368 ms

7 [AS4766] 221.154.3.34 4.216 ms

8 [AS4766] 221.154.238.5 1.95 ms

Measurement taken from

IPinfo ProbeNet in Seoul, KR

On November 22nd 2025

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.

An API built with users in mind: reliable, accurate, and easy-to-use

Discover why industry-leading companies around the globe love our data. IPinfo's accurate insights fuel use cases from cybersecurity, data enrichment, web personalization, and much more.

Get Started for Free Contact Sales