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
203.251.7.0/24 AS4766 Hangukcheoldosiseolgongdan 256
203.251.77.0/24 AS38124 Korea Telecom 256
203.251.112.0/24 AS4766 Busanjangsindaehakgyo 256

Nearby Ranges

BGP prefixes that overlap with 203.251.0.0/16

Range ASN Company Num of IPs
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
203.251.192.0/18 AS9848 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
203.251.77.0/24 AS38124 Korea Telecom 256
203.251.251.0/24 AS9980 Hyundai Information Technology Co. Ltd. 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 460 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 k-metal.org 137
203.251.81.155 jymotonics.co.kr 67
203.251.81.76 ysomija.kr 35
203.251.81.78 xn--950b43dh5volb.kr 32
203.251.81.11 leebongju.com 20
203.251.80.131 kbsrd.or.kr 13
203.251.81.79 viablevision.or.kr 13
203.251.109.225 mogyefund.co.kr 12
203.251.81.77 u-tas.com 8
203.251.57.109 qxo.kr 8
203.251.109.230 cdws.or.kr 7
203.251.83.210 kb-one.co.kr 5
203.251.81.82 ycherbs.com 5
203.251.81.7 edualgo20.com 5
203.251.109.231 oceang.kr 5
203.251.57.106 amp.farm 4
203.251.114.66 hompi.info 4
203.251.80.15 totalleisureone.co.kr 4
203.251.81.216 dosanim.net 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

Pingable IPs

11,624 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address ASN Details
203.251.100.254 AS4766 Korea Telecom 6.28ms from Seoul, KR
203.251.74.222 AS4766 Korea Telecom 4.68ms from Seoul, KR
203.251.47.118 AS4766 Korea Telecom 4.54ms from Seoul, KR
203.251.96.18 AS4766 Korea Telecom 5.82ms from Seoul, KR
203.251.51.70 AS4766 Korea Telecom 6.39ms from Seoul, KR
203.251.113.13 AS4766 Korea Telecom 6.77ms from Seoul, KR
203.251.50.17 AS4766 Korea Telecom 5.11ms from Seoul, KR
203.251.24.116 AS4766 Korea Telecom 4.16ms from Seoul, KR
203.251.118.136 AS4766 Korea Telecom 6.47ms from Seoul, KR
203.251.33.100 AS4766 Korea Telecom 3.10ms from Seoul, KR
203.251.110.230 AS4766 Korea Telecom 4.35ms from Seoul, KR
203.251.54.97 AS4766 Korea Telecom 5.39ms from Seoul, KR
203.251.64.147 AS4766 Korea Telecom 5.94ms from Seoul, KR
203.251.81.148 AS4766 Korea Telecom 6.62ms from Seoul, KR
203.251.114.190 AS4766 Korea Telecom 6.42ms from Seoul, KR
203.251.103.1 AS4766 Korea Telecom 6.72ms from Seoul, KR
203.251.4.225 AS4766 Korea Telecom 3.00ms from Seoul, KR
203.251.63.62 AS4766 Korea Telecom 5.24ms from Seoul, KR
203.251.34.29 AS4766 Korea Telecom 3.04ms from Seoul, KR
203.251.14.171 AS4766 Korea Telecom 10.24ms from Seoul, KR
203.251.73.254 AS4766 Korea Telecom 4.45ms from Seoul, KR
203.251.106.193 AS4766 Korea Telecom 6.65ms from Seoul, KR
203.251.68.46 AS4766 Korea Telecom 5.01ms from Seoul, KR
203.251.44.84 AS4766 Korea Telecom 4.23ms from Seoul, KR
203.251.35.222 AS4766 Korea Telecom 3.62ms 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
217.104.89.1 AS33915 Vodafone Libertel B.V. 4.95ms from Amsterdam, NL
24.216.60.81 AS20115 Charter Communications LLC 5.28ms from Atlanta, US
69.61.34.97 AS22653 Cyber Wurx LLC 0.24ms from Atlanta, US
36.129.80.1 AS56044 China Mobile communications corporation 19.61ms from Beijing, CN
92.82.221.1 AS9050 Orange Romania S.A. 11.52ms from Bucharest, RO
64.237.119.81 AS53828 NETWORK INNOVATIONS, LLC 0.53ms from Chicago, US
172.99.176.129 AS63083 Chapin Long Distance, Inc. 8.60ms from Chicago, US
98.226.101.241 AS7922 Comcast Cable Communications, LLC 9.55ms from Chicago, US
82.3.180.1 AS5089 Virgin Media Limited 2.40ms from Erith, GB
217.216.167.1 AS152179 GLOBAL COMMUNICATION NETWORK LIMITED 0.48ms from Frankfurt am Main, DE
204.141.85.1 AS275 NTT America, Inc. 0.43ms from Frankfurt am Main, DE
2.200.128.1 AS3209 Vodafone GmbH 5.77ms from Frankfurt am Main, DE
183.238.63.177 AS9808 China Mobile Communications Group Co., Ltd. 4.24ms from Guangzhou, CN
190.95.185.81 AS27947 Telconet S.A 1.41ms from Guayaquil, EC
183.129.38.1 AS4134 CHINANET-BACKBONE 4.34ms from Hangzhou, CN
1.55.244.241 AS18403 FPT Telecom Company 0.51ms from Hanoi, VN
72.234.154.1 AS36149 Hawaiian Telcom Services Company, Inc. 0.83ms from Honolulu, US
114.232.29.1 AS4134 CHINANET-BACKBONE 9.15ms from Huai'an, CN
125.167.148.1 AS7713 PT Telekomunikasi Indonesia 6.64ms from Jakarta, ID
112.9.64.1 AS24444 Shandong Mobile Communication Company Limited 6.51ms from Jinan, CN
122.129.77.193 AS17911 Brain Telecommunication Ltd. 17.49ms from Karachi, PK
60.164.131.1 AS4134 CHINANET-BACKBONE 4.58ms from Lanzhou, CN
209.21.78.33 AS4965 Vision Bahn Corp 0.24ms from Las Vegas, US
190.81.58.97 AS12252 America Movil Peru S.A.C. 0.76ms from Lima, PE
194.72.218.97 AS2856 British Telecommunications PLC 4.04ms from London, GB

Traceroute

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

$
traceroute -a -n -q1 203.251.13.57
traceroute to 203.251.13.57 (203.251.13.57): 64 hops max, 52 byte packets
2 *
3 *
4 *
5 [AS4766] 112.174.56.190 11.539 ms
6 [AS4766] 203.251.13.57 10.45 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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