203.242.0.0/23

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 203.242.0.0/23

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

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

IP Address	ASN	Details
203.242.0.161	AS17841 NATIONAL INFORMATION RESOURCES SERVICE	`1.53ms` from Seoul, KR
203.242.1.57	AS17841 NATIONAL INFORMATION RESOURCES SERVICE	`1.58ms` from Incheon, 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
154.242.92.55	AS36947 Telecom Algeria	`15.25ms` from Algiers, DZ
123.123.140.247	AS4808 China Unicom Beijing Province Network	`3.66ms` from Beijing, CN
96.172.193.247	AS53297 Comcast Cable Communications, LLC	`0.05ms` from Chicago, US
218.66.219.55	AS4134 CHINANET-BACKBONE	`4.20ms` from Fuzhou, CN
222.236.180.55	AS9318 SK Broadband Co Ltd	`5.17ms` from Incheon, KR
66.9.33.55	AS23260 Midcontinent Communications	`2.80ms` from Minneapolis, US
217.72.156.183	AS29388 Best Telecom ISP	`2.26ms` from Moscow, RU
80.72.112.39	AS34467 JSC Telephone Company "Sotcom"	`4.31ms` from Moscow, RU
68.202.178.55	AS33363 Charter Communications, Inc	`6.63ms` from Orlando, US
73.25.193.7	AS7922 Comcast Cable Communications, LLC	`3.52ms` from Portland, US
39.72.252.55	AS4837 CHINA UNICOM China169 Backbone	`3.75ms` from Qingdao, CN
34.194.215.215	AS14618 Amazon.com, Inc.	`0.20ms` from Reston, US
23.41.84.135	AS16625 Akamai Technologies, Inc.	`0.96ms` from Seoul, KR
1.240.190.87	AS9318 SK Broadband Co Ltd	`2.00ms` from Seoul, KR
111.53.157.7	AS56042 China Mobile communications corporation	`7.30ms` from Taiyuan, CN
118.151.184.55	AS2497 Internet Initiative Japan Inc.	`1.95ms` from Tokyo, JP
102.24.61.71	AS327934 SOCIETE NATIONALE DES TELECOMMUNICATIONS (Tunisie Telecom)	`12.12ms` from Tunis, TN
83.175.65.215	AS31510 Innsbrucker Kommunalbetriebe AG	`8.45ms` from Vienna, AT
141.20.25.7	AS680 Verein zur Foerderung eines Deutschen Forschungsnetzes e.V.	`1.19ms` from Berlin, DE
32.96.86.199	AS7018 AT&T Enterprises, LLC	`2.65ms` from Denver, US
222.232.149.135	AS9318 SK Broadband Co Ltd	`6.98ms` from Incheon, KR
94.174.207.23	AS5089 Virgin Media Limited	`5.23ms` from London, GB
194.9.18.247	AS200497 WAVECOM SRL	`0.34ms` from Milan, IT
112.232.7.247	AS4837 CHINA UNICOM China169 Backbone	`6.17ms` from Qingdao, CN
121.157.204.71	AS4766 Korea Telecom	`1.67ms` from Seoul, KR

Traceroute

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

traceroute -a -n -q1 -f5 203.242.1.145

traceroute to 203.242.1.145 (203.242.1.145): 64 hops max, 52 byte packets

5 [AS8447] 195.3.64.165 6.452 ms

6 *

7 *

8 [] 80.81.193.16 17.829 ms

9 *

10 *

11 [AS3786] 1.208.107.218 224.774 ms

12 [AS3786] 211.40.2.250 260.407 ms

13 *

14 *

15 *

16 [AS17841] 152.99.71.66 272.441 ms

17 [AS17841] 203.242.1.145 265.962 ms

Measurement taken from

IPinfo ProbeNet in Ljubljana, SI

On January 19th 2026

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