221.157.125.0/24

AS152232 · kt cloud Co., Ltd

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Summary

Country	South Korea
Domain	kt.com
ASN	AS152232
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 221.157.125.0/24

Range	ASN	Company	Num of IPs
221.144.0.0/12	AS131842	Korea Telecom	1,048,576
221.144.0.0/12	AS152214	Korea Telecom	1,048,576
221.144.0.0/12	AS152232	Korea Telecom	1,048,576
221.144.0.0/12	AS4766	Korea Telecom	1,048,576
221.144.0.0/12	AS9856	Korea Telecom	1,048,576

Nearby Ranges

BGP prefixes that overlap with 221.157.0.0/16

Range	ASN	Company	Num of IPs
221.144.0.0/12	AS131842	Korea Telecom	1,048,576
221.144.0.0/12	AS152214	Korea Telecom	1,048,576
221.144.0.0/12	AS152232	Korea Telecom	1,048,576
221.144.0.0/12	AS4766	Korea Telecom	1,048,576
221.144.0.0/12	AS9856	Korea Telecom	1,048,576
221.157.126.0/24	AS4766	Gyeongbukgwahakdaehakgyo	256
221.157.127.0/24	AS4766	Gyeongbukgwahakdaehakgyo	256
221.157.116.0/24	AS4766	Gyemyeongmunhwadaehakgyojang	256

Hosted domains

There are 44 domain names hosted across 13 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address	Domain	Domains on this IP
221.157.125.147	najumbnmarathon.com	11
221.157.125.140	mbumper.com	9
221.157.125.135	dblueny.com	7
221.157.125.130	omniherb.co.kr	5
221.157.125.163	gjsam.or.kr	2
221.157.125.198	hedu.kr	2
221.157.125.41	aitom.co.kr	2
221.157.125.56	aino1.co.kr	2
221.157.125.228	xpe.kr	2
221.157.125.164	cexpo.or.kr	1
221.157.125.229	ipe.kr	1
221.157.125.162	cexpo.or.kr	1
221.157.125.158	superyesweb.com	1

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

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

IP Address	ASN	Details
221.157.125.162	AS152232 kt cloud Co., Ltd	`6.97ms` 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
9.163.72.168	AS8075 Microsoft Corporation	`0.28ms` from Amsterdam, NL
43.210.90.24	AS16509 Amazon.com, Inc.	`1.58ms` from Bangkok, TH
124.43.12.8	AS9329 Sri Lanka Telecom Internet	`2.37ms` from Colombo, LK
37.3.204.88	AS1257 Tele2 Sverige AB	`1.39ms` from Copenhagen, DK
74.197.122.104	AS19108 Optimum	`19.01ms` from Dallas, US
91.6.179.216	AS3320 Deutsche Telekom AG	`4.33ms` from Frankfurt am Main, DE
86.169.233.104	AS2856 British Telecommunications PLC	`2.01ms` from London, GB
91.233.192.216	AS9009 M247 Europe SRL	`0.43ms` from New York City, US
97.101.221.248	AS33363 Charter Communications, Inc	`8.09ms` from Orlando, US
100.26.1.120	AS14618 Amazon.com, Inc.	`0.18ms` from Reston, US
130.204.33.40	AS13124 A1 Bulgaria EAD	`3.08ms` from Sofia, BG
31.149.184.248	AS1136 KPN B.V.	`0.62ms` from Amsterdam, NL
217.217.112.56	AS137409 GSL Networks Pty LTD	`6.48ms` from Buffalo, US
197.221.3.136	AS37153 Xneelo (Pty) Ltd	`1.66ms` from Cape Town, ZA
34.28.60.200	AS396982 Google LLC	`0.12ms` from Council Bluffs, US
18.184.67.248	AS16509 Amazon.com, Inc.	`0.19ms` from Frankfurt am Main, DE
1.59.203.104	AS4837 CHINA UNICOM China169 Backbone	`6.98ms` from Harbin, CN
125.148.252.72	AS4766 Korea Telecom	`2.02ms` from Incheon, KR
216.16.112.8	AS20412 Clarity Telecom LLC	`6.85ms` from Minneapolis, US
113.15.107.72	AS4134 CHINANET-BACKBONE	`3.64ms` from Nanning, CN
114.188.48.232	AS4713 NTT DOCOMO BUSINESS,Inc.	`9.81ms` from Osaka, JP
27.198.97.120	AS4837 CHINA UNICOM China169 Backbone	`8.16ms` from Qingdao, CN
61.41.151.104	AS3786 LG DACOM Corporation	`1.62ms` from Seoul, KR
118.51.164.104	AS4766 Korea Telecom	`2.49ms` from Seoul, KR
115.120.124.8	AS55990 Huawei Cloud Service data center	`6.99ms` from Shanghai, CN

Traceroute

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

traceroute -a -n -q1 221.157.125.129

traceroute to 221.157.125.129 (221.157.125.129): 64 hops max, 52 byte packets

1 [AS15169] 172.253.64.138 0.57 ms

2 *

3 *

4 [AS4766] 112.174.100.66 7.544 ms

5 *

6 [AS4766] 121.150.185.114 8.356 ms

7 [AS152232] 221.157.125.129 8.549 ms

Measurement taken from

IPinfo ProbeNet in Seoul, KR

On January 30th 2026

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.

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