203.251.0.0/17

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	KRNIC
ID	KORNET-KR

WHOIS Details

inetnum:        203.251.0.0 - 203.251.191.255
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
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:        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 203.251.0.0/16

Range	ASN	Company	Num of IPs
203.251.192.0/18	AS4664	SEJONG NETWORKS	16,384
203.251.192.0/18	AS4670	SEJONG NETWORKS	16,384
203.251.192.0/18	AS7562	SEJONG NETWORKS	16,384
203.251.192.0/18	AS9848	SEJONG NETWORKS	16,384
203.251.192.0/18	AS9980	SEJONG NETWORKS	16,384

Hosted domains

There are 469 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
203.251.80.85	mfa0117.or.kr	136
203.251.81.155	jymotonics.co.kr	68
203.251.81.76	podotravel.kr	35
203.251.81.78	mchon.kr	32
203.251.81.11	yonseimoon.kr	22
203.251.80.131	needget.net	16
203.251.81.79	cowoojoo.com	13
203.251.109.225	mxc.kr	12
203.251.81.77	u-tas.com	8
203.251.57.109	gj1080.co.kr	8
203.251.109.230	eco-unmunsan.kr	7
203.251.81.7	edualgo20.com	5
203.251.81.82	kcfarm.kr	5
203.251.109.231	oceang.kr	5
203.251.83.210	kbone.co.kr	5
203.251.57.106	amp.farm	4
203.251.81.216	yhmetal.net	4
203.251.80.15	wjun.co.kr	4
203.251.114.66	hompi.info	4
203.251.81.15	printvill.net	3

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

11,427 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address	ASN	Details
203.251.21.77	AS4766 Korea Telecom	`1.82ms` from Seoul, KR
203.251.12.126	AS4766 Korea Telecom	`10.17ms` from Seoul, KR
203.251.97.102	AS4766 Korea Telecom	`4.53ms` from Seoul, KR
203.251.109.225	AS4766 Korea Telecom	`4.36ms` from Seoul, KR
203.251.71.134	AS4766 Korea Telecom	`6.34ms` from Seoul, KR
203.251.23.1	AS4766 Korea Telecom	`3.29ms` from Seoul, KR
203.251.55.198	AS4766 Korea Telecom	`5.70ms` from Seoul, KR
203.251.11.114	AS4766 Korea Telecom	`9.85ms` from Seoul, KR
203.251.41.13	AS4766 Korea Telecom	`4.45ms` from Seoul, KR
203.251.35.222	AS4766 Korea Telecom	`3.73ms` from Seoul, KR
203.251.63.251	AS4766 Korea Telecom	`5.14ms` from Seoul, KR
203.251.0.1	AS4766 Korea Telecom	`4.28ms` from Seoul, KR
203.251.114.190	AS4766 Korea Telecom	`6.66ms` from Seoul, KR
203.251.49.126	AS4766 Korea Telecom	`5.40ms` from Seoul, KR
203.251.126.50	AS4766 Korea Telecom	`6.44ms` from Seoul, KR
203.251.105.99	AS4766 Korea Telecom	`6.51ms` from Seoul, KR
203.251.78.200	AS4766 Korea Telecom	`4.76ms` from Seoul, KR
203.251.20.132	AS4766 Korea Telecom	`2.98ms` from Seoul, KR
203.251.31.1	AS4766 Korea Telecom	`4.82ms` from Seoul, KR
203.251.112.100	AS4766 Korea Telecom	`7.06ms` from Seoul, KR
203.251.58.230	AS4766 Korea Telecom	`5.25ms` from Seoul, KR
203.251.6.25	AS4766 Korea Telecom	`3.61ms` from Seoul, KR
203.251.15.206	AS4766 Korea Telecom	`10.28ms` from Seoul, KR
203.251.66.190	AS4766 Korea Telecom	`6.86ms` from Seoul, KR
203.251.115.254	AS4766 Korea Telecom	`6.64ms` 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
146.50.250.65	AS1124 Universiteit van Amsterdam	`0.71ms` from Amsterdam, NL
87.215.103.1	AS13127 Odido Netherlands B.V.	`2.69ms` from Amsterdam, NL
194.245.71.1	AS5517 CSL Computer Service Langenbach GmbH	`8.34ms` from Amsterdam, NL
209.150.101.1	AS7055 Quantum Internet Services, Inc.	`0.42ms` from Ashburn, US
128.92.161.225	AS20115 Charter Communications LLC	`0.57ms` from Atlanta, US
123.123.23.17	AS4808 China Unicom Beijing Province Network	`3.57ms` from Beijing, CN
188.74.188.1	AS59532 COMETEINET TELECOM SRL	`7.85ms` from Bucharest, RO
190.19.71.1	AS7303 Telecom Argentina S.A.	`1.05ms` from Buenos Aires, AR
173.95.156.177	AS11426 Charter Communications Inc	`15.34ms` from Charlotte, US
182.141.2.1	AS4134 CHINANET-BACKBONE	`11.62ms` from Chengdu, CN
69.25.148.209	AS19024 Unitas Global	`0.43ms` from Chicago, US
50.82.233.1	AS30036 Mediacom Communications Corp	`7.83ms` from Chicago, US
173.18.64.1	AS30036 Mediacom Communications Corp	`3.65ms` from Chicago, US
37.34.114.1	AS43925 MOLDCELL S.A.	`0.66ms` from Chisinau, MD
74.215.196.1	AS6181 Cincinnati Bell Telephone Company LLC	`1.36ms` from Cincinnati, US
81.225.134.1	AS3301 Telia Company AB	`4.21ms` from Copenhagen, DK
45.225.172.49	AS266940 RNR Servicos de Internet Ltda	`3.38ms` from Curitiba, BR
42.53.70.1	AS4837 CHINA UNICOM China169 Backbone	`14.87ms` from Dalian, CN
104.152.244.1	AS13404 GoFIBER	`2.63ms` from Dallas, US
68.235.167.1	AS18859 GVEC.net, LLC	`7.77ms` from Dallas, US
74.113.58.1	AS31893 H5 Colo Associates LLC	`1.55ms` from Dallas, US
185.120.20.1	AS398397 QuickCentralNetworks	`0.17ms` from Dallas, US
195.38.27.1	AS15590 Atruvia AG	`3.06ms` from Duesseldorf, DE
176.198.71.81	AS3209 Vodafone GmbH	`7.21ms` from Duesseldorf, DE
62.20.102.177	AS3301 Telia Company AB	`0.90ms` from Goeteborg, SE

Traceroute

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

traceroute -a -n -q1 203.251.31.1

traceroute to 203.251.31.1 (203.251.31.1): 64 hops max, 52 byte packets

1 [AS31898] 140.91.214.46 0.072 ms

2 [AS4766] 218.145.32.254 0.761 ms

3 *

4 *

5 [AS4766] 112.174.117.106 3.495 ms

6 [AS4766] 112.188.165.70 3.982 ms

7 [AS4766] 112.188.170.202 5.772 ms

8 [AS4766] 203.251.31.1 5.348 ms

Measurement taken from

IPinfo ProbeNet in Seoul, KR

On October 30th 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