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:         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:        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:         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 203.251.0.0/17

Range ASN Company Num of IPs
203.251.112.0/24 AS4766 Busanjangsindaehakgyo 256
203.251.7.0/24 AS4766 Hangukcheoldosiseolgongdan 256
203.251.77.0/24 AS38124 Korea Telecom 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 0537907000.com 12
203.251.57.109 saemul.or.kr 8
203.251.109.230 eco-unmunsan.kr 5
203.251.109.231 oceang.kr 5
203.251.83.210 kbone.co.kr 5
203.251.57.106 amlease.co.kr 4
203.251.114.66 jdcsoft.co.kr 4
203.251.60.232 kjbank.co.kr 3
203.251.73.18 xn--j7q32d91g3ur.com 3
203.251.109.226 inply.net 3
203.251.114.67 dhgroove.com 3
203.251.73.6 xn--ob0bp8ivsaf07c.com 3
203.251.29.52 changoo.site 2
203.251.21.9 hanonsystems.com 2
203.251.72.50 jejo.info 2
203.251.109.196 singgreen.kr 2
203.251.73.252 coddi.com 2
203.251.57.107 soriview.or.kr 2
203.251.24.15 mirae.com 2
203.251.79.177 3star.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

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
203.251.94.58 AS4766 Korea Telecom 6.44ms from Incheon, KR
203.251.29.43 AS4766 Korea Telecom 3.31ms from Seoul, KR
203.251.124.236 AS4766 Korea Telecom 8.18ms from Seoul, KR
203.251.32.48 AS4766 Korea Telecom 3.11ms from Seoul, KR
203.251.116.71 AS4766 Korea Telecom 6.73ms from Seoul, KR
203.251.4.225 AS4766 Korea Telecom 3.35ms from Seoul, KR
203.251.81.3 AS152232 kt cloud Co., Ltd 6.82ms from Seoul, KR
203.251.1.166 AS4766 Korea Telecom 3.85ms from Seoul, KR
203.251.44.84 AS4766 Korea Telecom 4.24ms from Seoul, KR
203.251.100.254 AS4766 Korea Telecom 6.41ms from Seoul, KR
203.251.45.10 AS4766 Korea Telecom 4.02ms from Seoul, KR
203.251.73.254 AS4766 Korea Telecom 4.43ms from Seoul, KR
203.251.120.150 AS4766 Korea Telecom 7.20ms from Seoul, KR
203.251.121.142 AS4766 Korea Telecom 6.70ms from Seoul, KR
203.251.5.252 AS4766 Korea Telecom 2.57ms from Seoul, KR
203.251.19.1 AS4766 Korea Telecom 3.51ms from Seoul, KR
203.251.58.144 AS4766 Korea Telecom 4.97ms from Seoul, KR
203.251.79.154 AS4766 Korea Telecom 4.30ms from Seoul, KR
203.251.36.206 AS4766 Korea Telecom 3.34ms from Seoul, KR
203.251.3.6 AS4766 Korea Telecom 3.47ms from Seoul, KR
203.251.39.66 AS4766 Korea Telecom 3.37ms from Seoul, KR
203.251.18.188 AS4766 Korea Telecom 3.10ms from Seoul, KR
203.251.118.5 AS4766 Korea Telecom 6.35ms from Seoul, KR
203.251.115.254 AS4766 Korea Telecom 6.47ms from Seoul, KR
203.251.91.121 AS4766 Korea Telecom 5.22ms 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
86.97.222.1 AS5384 Emirates Internet 5.38ms from Al Fujairah City, AE
217.62.216.1 AS33915 Vodafone Libertel B.V. 4.21ms from Amsterdam, NL
24.132.119.1 AS33915 Vodafone Libertel B.V. 3.39ms from Amsterdam, NL
84.106.240.1 AS33915 Vodafone Libertel B.V. 5.71ms from Amsterdam, NL
64.47.204.161 AS19855 Masergy Communications, Inc. 0.49ms from Ashburn, US
72.83.60.1 AS701 Verizon Business 1.45ms from Ashburn, US
96.115.136.209 AS7922 Comcast Cable Communications, LLC 0.74ms from Ashburn, US
24.236.96.145 AS12083 WideOpenWest Finance LLC 4.09ms from Atlanta, US
140.248.239.49 AS54113 Fastly, Inc. 0.17ms from Atlanta, US
36.64.79.97 AS7713 PT Telekomunikasi Indonesia 7.60ms from Batam, ID
223.72.182.49 AS56048 China Mobile Communicaitons Corporation 7.01ms from Beijing, CN
190.13.83.145 AS262186 TV AZTECA SUCURSAL COLOMBIA 5.13ms from Bogotá, CO
204.199.2.161 AS3549 Level 3 Parent, LLC 0.25ms from Buenos Aires, AR
181.228.141.1 AS7303 Telecom Argentina S.A. 14.20ms from Buenos Aires, AR
108.159.18.241 AS16509 Amazon.com, Inc. 0.36ms from Chennai, IN
75.133.27.1 AS20115 Charter Communications LLC 9.75ms from Chicago, US
12.167.247.65 AS7018 AT&T Enterprises, LLC 11.77ms from Chicago, US
99.99.242.1 AS7018 AT&T Enterprises, LLC 9.77ms from Chicago, US
14.111.230.1 AS4134 CHINANET-BACKBONE 1.23ms from Chongqing, CN
148.139.183.81 AS16839 SERVICENOW, INC. 5.21ms from Dallas, US
68.235.167.1 AS18859 GVEC.net, LLC 7.68ms from Dallas, US
147.243.71.225 AS8075 Microsoft Corporation 0.36ms from Duesseldorf, DE
67.71.187.1 AS577 Bell Canada 8.25ms from Edmonton, CA
217.216.167.1 AS152179 GLOBAL COMMUNICATION NETWORK LIMITED 0.51ms from Frankfurt am Main, DE
59.61.160.1 AS4134 CHINANET-BACKBONE 10.51ms from Fuzhou, CN

Traceroute

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

$
traceroute -a -n -q1 203.251.50.169
traceroute to 203.251.50.169 (203.251.50.169): 64 hops max, 52 byte packets
2 *
3 *
4 *
5 [AS4766] 112.174.57.26 6.123 ms
Measurement taken from IPinfo ProbeNet in Seoul, KR
On

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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