203.251.0.0/17

AS4766 · Korea Telecom

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Summary

Country	South Korea
Domain	kt.com
ASN	AS4766
Registry	APNIC
ID	KORNET

WHOIS Details

inetnum:        203.251.0.0 - 203.251.127.255
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:  2025-11-03T08:14:06Z
source:         APNIC

irt:            IRT-KRNIC-KR
address:        9, Jinheung-gil, Naju-si, Jeollanam-do
e-mail:         [email protected]
abuse-mailbox:  [email protected]
admin-c:        IM574-AP
tech-c:         IM574-AP
auth:           # Filtered
remarks:        [email protected] 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:         [email protected]
nic-hdl:        IM667-AP
mnt-by:         MNT-KRNIC-AP
last-modified:  2017-03-28T06:37:04Z
source:         APNIC

inetnum:        203.251.0.0 - 203.251.127.255
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:         [email protected]
nic-hdl:        IA9-KR
mnt-by:         MNT-KRNIC-AP
changed:        [email protected] 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:         [email protected]
nic-hdl:        IM9-KR
mnt-by:         MNT-KRNIC-AP
changed:        [email protected] 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 203.251.0.0/17

Range	ASN	Company	Num of IPs
203.251.77.0/24	AS38124	Korea Telecom	256
203.251.112.0/24	AS4766	Busanjangsindaehakgyo	256
203.251.7.0/24	AS4766	Hangukcheoldosiseolgongdan	256

Nearby Ranges

BGP prefixes that overlap with 203.251.0.0/16

Range	ASN	Company	Num of IPs
203.251.192.0/18	AS9848	SEJONG NETWORKS	16,384
203.251.192.0/18	AS4670	SEJONG NETWORKS	16,384
203.251.128.0/18	AS4766	Korea Telecom	16,384
203.251.192.0/18	AS4664	SEJONG NETWORKS	16,384
203.251.205.0/24	AS4670	SEJONG NETWORKS	256
203.251.112.0/24	AS4766	Busanjangsindaehakgyo	256
203.251.135.0/24	AS4766	Korea Telecom	256
203.251.136.0/24	AS4766	Korea Telecom	256
203.251.137.0/24	AS4766	Korea Telecom	256
203.251.7.0/24	AS4766	Hangukcheoldosiseolgongdan	256
203.251.207.0/24	AS7562	Hyundai Department	256
203.251.237.0/24	AS7562	Hyundai Department	256
203.251.246.0/24	AS9848	SEJONG NETWORKS	256
203.251.249.0/24	AS9848	SEJONG NETWORKS	256
203.251.250.0/24	AS9848	SEJONG NETWORKS	256
203.251.210.0/24	AS9980	Hyundai Information Technology Co. Ltd.	256
203.251.251.0/24	AS9980	Hyundai Information Technology Co. Ltd.	256
203.251.77.0/24	AS38124	Korea Telecom	256
203.251.152.0/24	AS45399	Hanjinjeongbotongsin(ju)	256
203.251.154.0/24	AS45399	Hanjinjeongbotongsin(ju)	256
203.251.201.0/24	AS4670	SEJONG NETWORKS	256
203.251.202.0/24	AS4670	SEJONG NETWORKS	256

Hosted domains

There are 458 domain names hosted across 68 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address	Domain	Domains on this IP
203.251.109.225	dkinnobiz.or.kr	12
203.251.57.109	saemul.or.kr	8
203.251.83.210	toolstec.co.kr	5
203.251.109.230	eco-unmunsan.kr	5
203.251.109.231	unicord.co.kr	5
203.251.57.106	amlease.co.kr	4
203.251.114.66	jdcsoft.com	4
203.251.73.6	xn--ob0bp8ivsaf07c.com	3
203.251.114.67	jinjuhg.kr	3
203.251.73.18	daedong.com.cn	3
203.251.109.226	inply.net	3
203.251.60.232	kwangjubank.co.kr	3
203.251.29.52	changoo.xyz	2
203.251.57.107	soriview.or.kr	2
203.251.24.15	mirae.co.kr	2
203.251.21.9	hanonsystems.com	2
203.251.72.50	son10.me	2
203.251.109.196	singgreen.kr	2
203.251.73.252	coddi.com	2
203.251.120.150	soombiseafood.co.kr	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

11,611 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address	ASN	Details
203.251.81.3	AS152232 kt cloud Co., Ltd	`6.82ms` from Seoul, KR
203.251.80.88	AS152232 kt cloud Co., Ltd	`6.96ms` from Seoul, KR
203.251.1.166	AS4766 Korea Telecom	`3.85ms` from Seoul, KR
203.251.50.169	AS4766 Korea Telecom	`5.11ms` from Seoul, KR
203.251.118.5	AS4766 Korea Telecom	`6.35ms` from Seoul, KR
203.251.48.154	AS4766 Korea Telecom	`5.48ms` from Seoul, KR
203.251.57.108	AS4766 Korea Telecom	`4.78ms` from Seoul, KR
203.251.41.161	AS4766 Korea Telecom	`4.33ms` from Seoul, KR
203.251.45.10	AS4766 Korea Telecom	`4.02ms` from Seoul, KR
203.251.30.114	AS4766 Korea Telecom	`2.83ms` from Incheon, KR
203.251.32.48	AS4766 Korea Telecom	`3.11ms` from Seoul, KR
203.251.13.49	AS4766 Korea Telecom	`9.82ms` from Seoul, KR
203.251.110.230	AS4766 Korea Telecom	`4.35ms` from Seoul, KR
203.251.16.71	AS4766 Korea Telecom	`3.80ms` from Seoul, KR
203.251.26.119	AS4766 Korea Telecom	`3.00ms` from Incheon, KR
203.251.73.254	AS4766 Korea Telecom	`4.43ms` from Seoul, KR
203.251.127.195	AS4766 Korea Telecom	`6.63ms` from Seoul, KR
203.251.15.250	AS4766 Korea Telecom	`10.10ms` from Seoul, KR
203.251.42.226	AS4766 Korea Telecom	`4.30ms` from Incheon, KR
203.251.33.117	AS4766 Korea Telecom	`3.15ms` from Seoul, KR
203.251.70.89	AS4766 Korea Telecom	`5.81ms` from Seoul, KR
203.251.62.10	AS4766 Korea Telecom	`5.55ms` from Seoul, KR
203.251.104.33	AS4766 Korea Telecom	`6.14ms` from Seoul, KR
203.251.108.1	AS4766 Korea Telecom	`8.91ms` from Seoul, KR
203.251.78.126	AS4766 Korea Telecom	`4.88ms` 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
84.106.240.1	AS33915 Vodafone Libertel B.V.	`5.71ms` from Amsterdam, NL
162.254.231.129	AS19684 Latigo, LLC	`5.97ms` from Atlanta, US
12.154.215.225	AS7018 AT&T Enterprises, LLC	`3.48ms` from Atlanta, US
36.64.79.97	AS7713 PT Telekomunikasi Indonesia	`7.60ms` from Batam, ID
110.240.125.1	AS4837 CHINA UNICOM China169 Backbone	`7.05ms` from Beijing, CN
170.223.168.145	AS40831 Mass General Brigham Incorporated	`1.96ms` from Boston, US
84.197.108.17	AS6848 Telenet BV	`6.07ms` from Brussels, BE
201.213.136.1	AS7303 Telecom Argentina S.A.	`6.57ms` from Buenos Aires, AR
191.97.192.1	AS7303 Telecom Argentina S.A.	`1.37ms` from Buenos Aires, AR
197.46.32.1	AS8452 TE-AS	`1.98ms` from Cairo, EG
102.39.244.1	AS11845 Vox Telecom Ltd	`1.90ms` from Cape Town, ZA
175.31.39.1	AS4134 CHINANET-BACKBONE	`18.44ms` from Changchun, CN
218.9.123.1	AS4837 CHINA UNICOM China169 Backbone	`7.48ms` from Changchun, CN
24.247.54.1	AS20115 Charter Communications LLC	`10.76ms` from Chicago, US
77.233.230.1	AS31027 GlobalConnect A/S	`0.52ms` from Copenhagen, DK
97.80.45.49	AS20115 Charter Communications LLC	`16.18ms` from Dallas, US
122.176.77.1	AS24560 Bharti Airtel Ltd., Telemedia Services	`1.25ms` from Delhi, IN
62.215.104.145	AS21050 Fast Communication Company Ltd	`15.27ms` from Dubai, AE
195.38.27.1	AS15590 Atruvia AG	`3.06ms` from Duesseldorf, DE
184.75.240.17	AS6939 Hurricane Electric LLC	`0.24ms` from Fremont, US
110.86.17.193	AS4134 CHINANET-BACKBONE	`5.47ms` from Fuzhou, CN
114.67.198.177	AS58466 CHINANET Guangdong province network	`2.40ms` from Guangzhou, CN
46.253.241.161	AS201035 LueneCom Kommunikationsloesungen GmbH	`0.96ms` from Hamburg, DE
222.167.31.1	AS9908 HK Cable TV Ltd	`1.20ms` from Hong Kong, HK
162.235.134.145	AS7018 AT&T Enterprises, LLC	`2.36ms` from Houston, 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 203.251.3.38

traceroute to 203.251.3.38 (203.251.3.38): 64 hops max, 52 byte packets

5 [AS4766] 112.188.144.86 4.701 ms

6 *

7 *

8 *

9 [AS4766] 203.251.3.38 4.887 ms

Measurement taken from

IPinfo ProbeNet in Seoul, KR

On January 30th 2026

What are IP address ranges?

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