203.237.103.0/24

AS9754 · CHOSUN UNIVERSITY

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Summary

Country	South Korea
Domain	kren.kr
ASN	AS9754
Parent Range	203.237.96.0/19
Registry	APNIC
ID	KREN

WHOIS Details

inetnum:        203.237.96.0 - 203.237.127.255
netname:        KREN
descr:          Korean Education Network
admin-c:        IM70-AP
tech-c:         IM70-AP
country:        KR
status:         ALLOCATED PORTABLE
mnt-by:         MNT-KRNIC-AP
mnt-irt:        IRT-KRNIC-KR
last-modified:  2017-02-02T04:55:26Z
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:        57 Daehak-ro, Jongno-gu, Seoul
country:        KR
phone:          +82-2-882-5363
e-mail:         kindman@kren.kr
nic-hdl:        IM70-AP
mnt-by:         MNT-KRNIC-AP
last-modified:  2025-11-17T00:10:02Z
source:         APNIC

inetnum:        203.237.96.0 - 203.237.127.255
netname:        KREN-KR
descr:          Korean Education Network
country:        KR
admin-c:        IA142-KR
tech-c:         IM142-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:        57 Daehak-ro, Jongno-gu, Seoul
address:        1
country:        KR
phone:          +82-2-882-5363
e-mail:         kindman@kren.kr
nic-hdl:        IA142-KR
mnt-by:         MNT-KRNIC-AP
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:        57 Daehak-ro, Jongno-gu, Seoul
address:        1
country:        KR
phone:          +82-2-882-5363
e-mail:         kindman@kren.kr
nic-hdl:        IM142-KR
mnt-by:         MNT-KRNIC-AP
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 203.237.103.0/24

Range	ASN	Company	Num of IPs
203.237.96.0/19	AS9754	Korean Education Network	8,192

Nearby Ranges

BGP prefixes that overlap with 203.237.0.0/16

Range	ASN	Company	Num of IPs
203.237.128.0/17	AS3786	Korean Education Network	32,768
203.237.128.0/17	AS23983	Korean Education Network	32,768
203.237.128.0/17	AS4766	Korean Education Network	32,768
203.237.32.0/19	AS18297	Gwangju Institute of Science and Technology	8,192
203.237.96.0/19	AS9754	Korean Education Network	8,192
203.237.64.0/19	AS9778	KISTI	8,192
203.237.0.0/19	AS10166	Korea Water Resources Corporation	8,192
203.237.202.0/23	AS18026	CHEJU NATIONAL UNIVERSITY	512
203.237.173.0/24	AS18031	SANGMYUNG UNIVERSITY	256
203.237.161.0/24	AS3786	Dongyang Technical College	256
203.237.164.0/24	AS3786	Dongyang Technical College	256
203.237.163.0/24	AS3786	Dongyang Technical College	256
203.237.166.0/24	AS3786	Dongyang Technical College	256
203.237.162.0/24	AS3786	Dongyang Technical College	256
203.237.167.0/24	AS3786	Dongyang Technical College	256
203.237.165.0/24	AS3786	Dongyang Technical College	256
203.237.172.0/24	AS3786	SANGMYUNG UNIVERSITY	256
203.237.160.0/24	AS3786	Dongyang Technical College	256
203.237.254.0/24	AS38694	CHEONGJU NATIONAL UNIVERSITY OF EDUCATION	256
203.237.255.0/24	AS38694	CHEONGJU NATIONAL UNIVERSITY OF EDUCATION	256
203.237.210.0/24	AS4766	useokUniversity	256
203.237.207.0/24	AS4766	useokUniversity	256
203.237.213.0/24	AS4766	useokUniversity	256
203.237.215.0/24	AS4766	useokUniversity	256
203.237.212.0/24	AS4766	useokUniversity	256
203.237.211.0/24	AS4766	useokUniversity	256
203.237.205.0/24	AS4766	useokUniversity	256
203.237.214.0/24	AS4766	useokUniversity	256
203.237.250.0/24	AS4766	Chungang University	256
203.237.158.0/24	AS4766	DAEJEON UNIVERSITY	256
203.237.157.0/24	AS4766	DAEJEON UNIVERSITY	256
203.237.156.0/24	AS4766	DAEJEON UNIVERSITY	256
203.237.191.0/24	AS4766	daekuUniversity of Education	256
203.237.209.0/24	AS4766	useokUniversity	256
203.237.206.0/24	AS4766	useokUniversity	256
203.237.159.0/24	AS4766	DAEJEON UNIVERSITY	256
203.237.204.0/24	AS4766	useokUniversity	256
203.237.225.0/24	AS4766	HALLYM COLLEGE	256
203.237.224.0/24	AS4766	DANKOOK UNIVERSITY	256
203.237.208.0/24	AS4766	useokUniversity	256
203.237.231.0/24	AS4766	HALLYM COLLEGE	256
203.237.223.0/24	AS9318	DANKOOK UNIVERSITY	256
203.237.219.0/24	AS9318	DANKOOK UNIVERSITY	256
203.237.190.0/24	AS9318	Shinhan University	256
203.237.222.0/24	AS9318	DANKOOK UNIVERSITY	256
203.237.221.0/24	AS9318	DANKOOK UNIVERSITY	256
203.237.218.0/24	AS9318	DANKOOK UNIVERSITY	256
203.237.226.0/24	AS9318	DANKOOK UNIVERSITY	256
203.237.216.0/24	AS9318	DANKOOK UNIVERSITY	256
203.237.217.0/24	AS9318	DANKOOK UNIVERSITY	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

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

IP Address	ASN	Details
203.237.103.91	AS9754 CHOSUN UNIVERSITY	`6.16ms` 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
94.68.72.88	AS6799 Ote SA (Hellenic Telecommunications Organisation)	`9.83ms` from Athens, GR
184.185.200.168	AS22773 Cox Communications Inc.	`0.38ms` from Atlanta, US
216.131.114.216	AS62240 Clouvider	`0.23ms` from Frankfurt am Main, DE
81.156.215.120	AS2856 British Telecommunications PLC	`1.69ms` from London, GB
64.167.222.104	AS7018 AT&T Enterprises, LLC	`1.81ms` from Los Angeles, US
15.161.92.184	AS16509 Amazon.com, Inc.	`0.13ms` from Milan, IT
70.119.75.168	AS11427 Charter Communications Inc	`4.52ms` from Richardson, US
203.125.220.104	AS3758 SingNet	`2.27ms` from Singapore, SG
188.186.183.120	AS41682 JSC "ER-Telecom Holding"	`12.54ms` from Yekaterinburg, RU
222.210.73.72	AS4134 CHINANET-BACKBONE	`2.21ms` from Chengdu, CN
76.150.134.152	AS7922 Comcast Cable Communications, LLC	`3.31ms` from Chicago, US
218.38.233.168	AS9318 SK Broadband Co Ltd	`1.30ms` from Incheon, KR
159.224.22.232	AS13188 CONTENT DELIVERY NETWORK LTD	`1.30ms` from Kharkiv, UA
89.117.130.56	AS46475 Limestone Networks, Inc.	`0.66ms` from Los Angeles, US
15.216.75.56	AS16509 Amazon.com, Inc.	`5.59ms` from Madrid, ES
108.219.45.40	AS7018 AT&T Enterprises, LLC	`2.77ms` from Miami, US
47.41.106.8	AS20115 Charter Communications LLC	`9.35ms` from Minneapolis, US
37.18.104.8	AS3284 ServiceCloud Ltd.	`1.08ms` from Moscow, RU
121.241.23.72	AS4755 TATA Communications formerly VSNL is Leading ISP	`0.97ms` from Mumbai, IN
217.244.143.8	AS3320 Deutsche Telekom AG	`3.94ms` from Nuernberg, DE
84.187.7.104	AS3320 Deutsche Telekom AG	`7.60ms` from Nuernberg, DE
90.79.25.88	AS3215 Orange S.A.	`1.67ms` from Paris, FR
198.38.16.40	AS3140 The Thomas Jefferson High School for Science and Tech.	`2.56ms` from Ashburn, US
44.245.36.232	AS16509 Amazon.com, Inc.	`0.15ms` from Boardman, US
90.132.12.8	AS1257 Tele2 Sverige AB	`1.58ms` from Copenhagen, DK

Traceroute

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

traceroute -a -n -q1 203.237.103.91

traceroute to 203.237.103.91 (203.237.103.91): 64 hops max, 52 byte packets

1 [AS31898] 140.91.214.43 0.065 ms

2 [AS4766] 218.145.32.254 0.884 ms

3 *

4 *

5 [AS4766] 112.174.103.38 5.858 ms

6 [AS4766] 112.190.198.18 5.383 ms

7 [AS4766] 218.157.75.226 5.658 ms

8 [AS9754] 203.237.127.76 7.94 ms

9 *

10 *

11 *

12 [AS9754] 203.237.103.91 6.608 ms

Measurement taken from

IPinfo ProbeNet in Seoul, KR

On March 29th 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.

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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