203.237.128.0/20

AS23983 · Daejeon University

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Summary

Country	South Korea
Domain	kren.kr
ASN	AS23983
Parent Range	203.237.128.0/17
Registry	APNIC
ID	KREN

WHOIS Details

inetnum:        203.237.128.0 - 203.237.255.255
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:  2017-02-02T04:55:27Z
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:        57 Daehak-ro, Jongno-gu, Seoul
country:        KR
phone:          +82-2-882-5363
e-mail:         [email protected]
nic-hdl:        IM70-AP
mnt-by:         MNT-KRNIC-AP
last-modified:  2025-11-17T00:10:02Z
source:         APNIC

inetnum:        203.237.128.0 - 203.237.255.255
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:        [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:        57 Daehak-ro, Jongno-gu, Seoul
address:        1
country:        KR
phone:          +82-2-882-5363
e-mail:         [email protected]
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:         [email protected]
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 203.237.128.0/20

Range	ASN	Company	Num of IPs
203.237.128.0/17	AS4766	Korean Education Network	32,768
203.237.128.0/17	AS3786	Korean Education Network	32,768
203.237.128.0/17	AS23983	Korean Education Network	32,768

Nearby Ranges

BGP prefixes that overlap with 203.237.0.0/16

Range	ASN	Company	Num of IPs
203.237.128.0/17	AS23983	Korean Education Network	32,768
203.237.128.0/17	AS4766	Korean Education Network	32,768
203.237.128.0/17	AS3786	Korean Education Network	32,768
203.237.64.0/19	AS9778	KISTI	8,192
203.237.32.0/19	AS18297	Gwangju Institute of Science and Technology	8,192
203.237.0.0/19	AS10166	Korea Water Resources Corporation	8,192
203.237.96.0/19	AS9754	Korean Education Network	8,192
203.237.202.0/23	AS18026	CHEJU NATIONAL UNIVERSITY	512
203.237.175.0/24	AS18031	SANGMYUNG UNIVERSITY	256
203.237.160.0/24	AS3786	Dongyang Technical College	256
203.237.161.0/24	AS3786	Dongyang Technical College	256
203.237.162.0/24	AS3786	Dongyang Technical College	256
203.237.163.0/24	AS3786	Dongyang Technical College	256
203.237.164.0/24	AS3786	Dongyang Technical College	256
203.237.165.0/24	AS3786	Dongyang Technical College	256
203.237.166.0/24	AS3786	Dongyang Technical College	256
203.237.167.0/24	AS3786	Dongyang Technical College	256
203.237.172.0/24	AS3786	SANGMYUNG UNIVERSITY	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
203.237.154.0/24	AS4766	DAEJEON UNIVERSITY	256
203.237.156.0/24	AS4766	DAEJEON UNIVERSITY	256
203.237.157.0/24	AS4766	DAEJEON UNIVERSITY	256
203.237.158.0/24	AS4766	DAEJEON UNIVERSITY	256
203.237.159.0/24	AS4766	DAEJEON UNIVERSITY	256
203.237.191.0/24	AS4766	daekuUniversity of Education	256
203.237.204.0/24	AS4766	useokUniversity	256
203.237.205.0/24	AS4766	useokUniversity	256
203.237.206.0/24	AS4766	useokUniversity	256
203.237.207.0/24	AS4766	useokUniversity	256
203.237.208.0/24	AS4766	useokUniversity	256
203.237.209.0/24	AS4766	useokUniversity	256
203.237.210.0/24	AS4766	useokUniversity	256
203.237.211.0/24	AS4766	useokUniversity	256
203.237.212.0/24	AS4766	useokUniversity	256
203.237.213.0/24	AS4766	useokUniversity	256
203.237.214.0/24	AS4766	useokUniversity	256
203.237.215.0/24	AS4766	useokUniversity	256
203.237.224.0/24	AS4766	DANKOOK UNIVERSITY	256
203.237.225.0/24	AS4766	HALLYM COLLEGE	256
203.237.231.0/24	AS4766	HALLYM COLLEGE	256
203.237.250.0/24	AS4766	Chungang University	256
203.237.190.0/24	AS9318	Shinhan University	256
203.237.216.0/24	AS9318	DANKOOK UNIVERSITY	256
203.237.217.0/24	AS9318	DANKOOK UNIVERSITY	256
203.237.218.0/24	AS9318	DANKOOK UNIVERSITY	256
203.237.220.0/24	AS9318	DANKOOK UNIVERSITY	256
203.237.221.0/24	AS9318	DANKOOK UNIVERSITY	256
203.237.222.0/24	AS9318	DANKOOK UNIVERSITY	256
203.237.223.0/24	AS9318	DANKOOK UNIVERSITY	256

Hosted domains

There is 1 domain name hosted across 1 IP address on this ASN. Checkout our API to access full domain hosting information.

IP Address	Domain	Domains on this IP
203.237.128.80	dju.ac.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

Read more

Pingable IPs

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

IP Address	ASN	Details
203.237.134.230	AS23983 Daejeon University	`3.96ms` from Seoul, KR
203.237.131.30	AS23983 Daejeon University	`3.76ms` from Seoul, KR
203.237.128.80	AS23983 Daejeon University	`4.63ms` 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
23.126.63.36	AS7018 AT&T Enterprises, LLC	`13.01ms` from Atlanta, US
108.251.159.100	AS7018 AT&T Enterprises, LLC	`5.75ms` from Atlanta, US
50.237.65.196	AS7922 Comcast Cable Communications, LLC	`1.22ms` from Boston, US
191.82.68.52	AS22927 Telefonica de Argentina	`18.62ms` from Buenos Aires, AR
72.16.45.20	AS7029 Windstream Communications LLC	`0.81ms` from Chicago, US
95.9.212.52	AS9121 Turk Telekomunikasyon Anonim Sirketi	`13.10ms` from Denizli, TR
161.156.94.212	AS36351 IBM Cloud	`0.72ms` from Frankfurt am Main, DE
139.199.175.180	AS45090 Shenzhen Tencent Computer Systems Company Limited	`1.97ms` from Guangzhou, CN
186.43.154.20	AS27668 ETAPA EP	`6.52ms` from Guayaquil, EC
121.203.245.4	AS17924 SmarTone Mobile Communications Ltd	`1.33ms` from Hong Kong, HK
144.202.165.52	AS17378 TierPoint, LLC	`3.39ms` from New York City, US
217.112.53.196	AS34949 IDLINE SAS	`5.33ms` from Paris, FR
221.144.108.100	AS4766 Korea Telecom	`5.67ms` from Seoul, KR
194.223.98.148	AS138384 Rakuten Mobile Network, Inc.	`2.75ms` from Tokyo, JP
163.143.124.68	AS2907 Research Organization of Information and Systems, National Institute of Informatics	`6.03ms` from Tokyo, JP
209.227.175.52	AS11814 Distributel Communications Limited	`0.92ms` from Toronto, CA
37.251.12.68	AS1136 KPN B.V.	`2.06ms` from Amsterdam, NL
50.80.218.180	AS30036 Mediacom Communications Corp	`14.74ms` from Atlanta, US
24.60.251.68	AS7922 Comcast Cable Communications, LLC	`9.84ms` from Boston, US
91.242.91.4	AS62281 VIDEOMAG SRL	`3.80ms` from Chisinau, MD
52.98.124.164	AS8075 Microsoft Corporation	`0.23ms` from Dongnae, KR
212.44.180.212	AS12579 Xenologics Networks & Communications GmbH	`1.96ms` from Duesseldorf, DE
84.168.247.244	AS3320 Deutsche Telekom AG	`4.48ms` from Duesseldorf, DE
136.185.211.116	AS24560 Bharti Airtel Ltd., Telemedia Services	`1.98ms` from Hyderabad, IN
176.38.114.100	AS39608 Lanet Network Ltd	`0.73ms` from Kyiv, UA

Traceroute

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

traceroute -a -n -q1 -m4 203.237.136.61

traceroute to 203.237.136.61 (203.237.136.61): 4 hops max, 52 byte packets

1 [AS136258] 23.95.79.3 6.72 ms

2 *

3 *

4 *

Measurement taken from

IPinfo ProbeNet in Miami, US

On December 6th 2025

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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