203.242.4.0/24

AS17841 · NATIONAL INFORMATION RESOURCES SERVICE

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Summary

Country	South Korea
Domain	kt.com
ASN	AS17841
Parent Range	203.242.0.0/19
Registry	KRNIC
ID	KORNET-KR

WHOIS Details

inetnum:        203.242.0.0 - 203.242.31.255
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

Overlapping Ranges

BGP prefixes that contain 203.242.4.0/24

Range	ASN	Company	Num of IPs
203.242.0.0/19	AS45400	Korea Telecom	8,192
203.242.0.0/19	AS17841	Korea Telecom	8,192
203.242.0.0/19	AS4766	Korea Telecom	8,192

Nearby Ranges

BGP prefixes that overlap with 203.242.0.0/16

Range	ASN	Company	Num of IPs
203.242.0.0/19	AS4766	Korea Telecom	8,192
203.242.0.0/19	AS17841	Korea Telecom	8,192
203.242.0.0/19	AS45400	Korea Telecom	8,192
203.242.32.0/20	AS10189	Hyundai Movex	4,096
203.242.80.0/20	AS10049	SK Co.,	4,096
203.242.48.0/21	AS10189	Hyundai Movex	2,048
203.242.56.0/22	AS10189	Hyundai Movex	1,024
203.242.60.0/23	AS10189	Hyundai Movex	512
203.242.207.0/24	AS7557	KTNETDRDAEJEONBACKBONE	256
203.242.62.0/24	AS10189	Hyundai Movex	256
203.242.202.0/24	AS7557	KTNETDRSERVICENETWORK	256

Hosted domains

There are no domains currently hosted on this ASN.

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

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

IP Address	ASN	Details
203.242.4.177	AS17841 NATIONAL INFORMATION RESOURCES SERVICE	`3.38ms` 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
77.170.112.184	AS1136 KPN B.V.	`3.05ms` from Amsterdam, NL
211.27.131.24	AS9443 Vocus Retail	`1.79ms` from Brisbane, AU
88.246.151.88	AS9121 Turk Telekomunikasyon Anonim Sirketi	`8.46ms` from Bursa, TR
109.76.71.152	AS15502 Vodafone Ireland Limited	`3.21ms` from Dublin, IE
141.239.97.216	AS36149 Hawaiian Telcom Services Company, Inc.	`2.60ms` from Honolulu, US
45.249.165.184	AS23860 Alliance Broadband Services Pvt. Ltd.	`0.20ms` from Kolkata, IN
92.57.180.104	AS12479 Orange Espagne SA	`7.56ms` from Madrid, ES
80.47.188.8	AS13285 TalkTalk Communications Limited	`2.64ms` from Manchester, GB
71.251.209.232	AS701 Verizon Business	`1.64ms` from New York City, US
61.127.243.152	AS4713 NTT DOCOMO BUSINESS,Inc.	`7.04ms` from Osaka, JP
3.221.236.88	AS14618 Amazon.com, Inc.	`0.22ms` from Reston, US
73.92.37.56	AS7922 Comcast Cable Communications, LLC	`6.18ms` from San Jose, US
73.252.131.232	AS7922 Comcast Cable Communications, LLC	`5.98ms` from San Jose, US
189.123.81.120	AS28573 Claro NXT Telecomunicacoes Ltda	`8.26ms` from Sao Paulo, BR
221.71.225.216	AS17676 SoftBank Corp.	`3.59ms` from Tokyo, JP
60.100.113.120	AS17676 SoftBank Corp.	`3.39ms` from Tokyo, JP
91.220.82.40	AS31477 Duocast B.V.	`3.80ms` from Amsterdam, NL
180.183.248.152	AS45758 Triple T Broadband Public Company Limited	`2.27ms` from Bangkok, TH
120.61.46.216	AS9829 National Internet Backbone	`11.96ms` from Bengaluru, IN
186.119.135.88	AS3816 COLOMBIA TELECOMUNICACIONES S.A. ESP BIC	`3.62ms` from Bogota, CO
3.134.203.168	AS16509 Amazon.com, Inc.	`0.12ms` from Columbus, US
93.226.169.120	AS3320 Deutsche Telekom AG	`5.25ms` from Duesseldorf, DE
91.33.102.152	AS3320 Deutsche Telekom AG	`7.03ms` from Frankfurt am Main, DE
87.173.78.120	AS3320 Deutsche Telekom AG	`8.43ms` from Frankfurt am Main, DE
175.225.145.88	AS4766 Korea Telecom	`2.27ms` from Incheon, KR

Traceroute

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

traceroute -a -n -q1 203.242.4.193

traceroute to 203.242.4.193 (203.242.4.193): 64 hops max, 52 byte packets

1 [AS31898] 140.91.214.47 0.076 ms

2 [AS3786] 211.118.152.142 1.077 ms

3 *

4 *

5 *

6 *

7 [AS3786] 1.213.113.138 1.757 ms

8 [AS3786] 1.208.179.138 2.797 ms

9 [AS3786] 210.107.53.202 3.9 ms

10 *

11 *

12 *

13 [AS17841] 203.238.168.166 4.64 ms

14 [AS17841] 203.242.4.193 4.209 ms

Measurement taken from

IPinfo ProbeNet in Seoul, KR

On January 19th 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.

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