210.121.16.0/21

AS45374 · CCS

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Summary

Country	South Korea
Domain	sejongnetworks.com
ASN	AS45374
Parent Range	210.121.0.0/17
Registry	APNIC
ID	SHINBIRO

WHOIS Details

inetnum:        210.121.0.0 - 210.121.127.255
netname:        SEJONG
descr:          SEJONG NETWORKS
country:        KR
admin-c:        IM686-AP
tech-c:         IM686-AP
status:         ALLOCATED PORTABLE
mnt-by:         MNT-KRNIC-AP
mnt-irt:        IRT-KRNIC-KR
last-modified:  2024-09-10T08:50:08Z
source:         APNIC

irt:            IRT-KRNIC-KR
address:        Jeollanam-do Naju-si Jinheung-gil
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:  2021-06-15T06:21:49Z
source:         APNIC

person:         IP Manager
address:        12 Gwacheon-daero 7-gil, Gwacheon-si, Gyeonggi-do
country:        KR
phone:          +82-2-1688-2200
e-mail:         [email protected]
nic-hdl:        IM686-AP
mnt-by:         MNT-KRNIC-AP
last-modified:  2024-09-10T08:42:02Z
source:         APNIC

Overlapping Ranges

BGP prefixes that contain 210.121.16.0/21

Range	ASN	Company	Num of IPs
210.121.0.0/17	AS45374	SEJONG NETWORKS	32,768
210.121.0.0/17	AS9848	SEJONG NETWORKS	32,768

Nearby Ranges

BGP prefixes that overlap with 210.121.0.0/16

Range	ASN	Company	Num of IPs
210.121.128.0/17	AS10058	Korea Telecom	32,768
210.121.128.0/17	AS152290	Korea Telecom	32,768
210.121.128.0/17	AS18176	Korea Telecom	32,768
210.121.128.0/17	AS38676	Korea Telecom	32,768
210.121.0.0/17	AS45374	SEJONG NETWORKS	32,768
210.121.128.0/17	AS4766	Korea Telecom	32,768
210.121.128.0/17	AS55627	Korea Telecom	32,768
210.121.0.0/17	AS9848	SEJONG NETWORKS	32,768

Hosted domains

There are no domains currently hosted on this ASN.

Hosted domains API

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Useful for Cybersecurity

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Pingable IPs

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

IP Address	ASN	Details
210.121.17.1	AS45374 CCS	`6.85ms` from Incheon, KR
210.121.23.148	AS45374 CCS	`3.71ms` from Incheon, KR
210.121.21.111	AS45374 CCS	`3.87ms` from Incheon, KR
210.121.20.117	AS45374 CCS	`4.61ms` from Incheon, KR
210.121.18.1	AS45374 CCS	`4.01ms` from Incheon, KR
210.121.22.121	AS45374 CCS	`3.86ms` 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
86.80.179.53	AS1136 KPN B.V.	`1.27ms` from Amsterdam, NL
222.129.247.5	AS4808 China Unicom Beijing Province Network	`3.17ms` from Beijing, CN
54.214.214.181	AS16509 Amazon.com, Inc.	`0.21ms` from Boardman, US
62.235.238.53	AS5432 Proximus NV	`1.23ms` from Brussels, BE
47.185.62.149	AS5650 Frontier Communications of America, Inc.	`1.48ms` from Dallas, US
116.40.81.101	AS17858 LG POWERCOMM	`1.75ms` from Incheon, KR
37.10.183.133	AS3352 TELEFONICA DE ESPANA S.A.U.	`18.12ms` from Madrid, ES
68.218.163.69	AS8075 Microsoft Corporation	`0.42ms` from Melbourne, AU
172.69.63.69	AS13335 Cloudflare, Inc.	`0.26ms` from Osaka, JP
170.245.102.181	AS28270 Alares_Internet	`4.52ms` from Osasco, BR
111.35.135.37	AS24444 Shandong Mobile Communication Company Limited	`8.60ms` from Qingdao, CN
186.205.243.69	AS28573 Claro NXT Telecomunicacoes Ltda	`8.59ms` from Rio de Janeiro, BR
114.69.96.149	AS2519 ARTERIA Networks Corporation	`3.40ms` from Tokyo, JP
107.197.25.229	AS7018 AT&T Enterprises, LLC	`3.60ms` from Atlanta, US
204.155.192.37	AS394927 Affinion Group, Inc.	`5.69ms` from Cincinnati, US
136.119.74.229	AS396982 Google LLC	`0.11ms` from Council Bluffs, US
14.254.8.117	AS45899 VNPT Corp	`2.30ms` from Da Nang, VN
198.166.123.101	AS852 TELUS Communications Inc.	`1.95ms` from Edmonton, CA
103.8.46.21	AS131317 TTSL-ISP DIVISION	`1.49ms` from Hyderabad, IN
212.166.158.117	AS12430 VODAFONE ESPANA S.A.U.	`0.58ms` from Madrid, ES
159.196.222.101	AS4764 Aussie Broadband	`0.84ms` from Melbourne, AU
174.166.174.229	AS7922 Comcast Cable Communications, LLC	`5.82ms` from New York City, US
35.247.192.229	AS396982 Google LLC	`0.11ms` from Sao Paulo, BR
65.61.127.85	AS17378 TierPoint, LLC	`7.90ms` from Seattle, US
118.158.51.101	AS2516 KDDI CORPORATION	`8.00ms` from Tokyo, JP

Traceroute

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

traceroute -a -n -q1 -m7 210.121.16.61

traceroute to 210.121.16.61 (210.121.16.61): 7 hops max, 52 byte packets

1 [AS400810] 23.26.227.1 0.12 ms

2 *

3 *

4 [AS30456] 23.136.28.203 9.469 ms

5 *

6 *

7 *

Measurement taken from

IPinfo ProbeNet in Charlotte, US

On January 30th 2026

What are IP address ranges?

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