121.55.128.0/20

AS9781 · GREEN CABLE TELEVISION STATION

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Summary

Country	South Korea
Domain	gcs.co.kr
ASN	AS9781
Parent Range	121.55.128.0/18
Registry	APNIC
ID	GCS-KR

WHOIS Details

inetnum:        121.55.128.0 - 121.55.191.255
netname:        GCS
descr:          GREEN CABLE TELEVISION STATION
country:        KR
admin-c:        IM706-AP
tech-c:         IM706-AP
status:         ALLOCATED PORTABLE
mnt-by:         MNT-KRNIC-AP
mnt-irt:        IRT-KRNIC-KR
last-modified:  2025-11-03T06:34:05Z
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:        Daegu Dalseo-gu Dalgubeol-daero 1611
country:        KR
phone:          +82-53-551-2009
e-mail:         [email protected]
nic-hdl:        IM706-AP
mnt-by:         MNT-KRNIC-AP
last-modified:  2024-11-15T08:44:04Z
source:         APNIC

inetnum:        121.55.128.0 - 121.55.191.255
netname:        GCS-KR
descr:          GREEN CABLE TELEVISION STATION
country:        KR
admin-c:        KW472-KR
tech-c:         KD472-KR
status:         ALLOCATED PORTABLE
mnt-by:         MNT-KRNIC-AP
mnt-irt:        IRT-KRNIC-KR
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:        Daegu Dalseo-gu Dalgubeol-daero 1611
address:        gamsamdong
country:        KR
phone:          +82-53-551-2009
e-mail:         [email protected]
nic-hdl:        KD472-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:        Daegu Dalseo-gu Dalgubeol-daero 1611
address:        gamsamdong
country:        KR
phone:          +82-53-551-2009
e-mail:         [email protected]
nic-hdl:        KW472-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 121.55.128.0/20

Range	ASN	Company	Num of IPs
121.55.128.0/18	AS9781	GREEN CABLE TELEVISION STATION	16,384

Nearby Ranges

BGP prefixes that overlap with 121.55.0.0/16

Range	ASN	Company	Num of IPs
121.55.192.0/18	AS3605	Kuentos Communications	16,384
121.55.0.0/18	AS45061	Shanghai Information Network Co.,Ltd.	16,384
121.55.128.0/18	AS9781	GREEN CABLE TELEVISION STATION	16,384
121.55.64.0/18	AS9781	GREEN CABLE TELEVISION STATION	16,384
121.55.192.0/19	AS3605	Kuentos Communications, Inc.	8,192
121.55.224.0/19	AS3605	Kuentos Communications, Inc.	8,192

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

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

IP Address	ASN	Details
121.55.128.255	AS9781 GREEN CABLE TELEVISION STATION	`5.55ms` from Seoul, KR
121.55.129.0	AS9781 GREEN CABLE TELEVISION STATION	`5.46ms` from Seoul, KR
121.55.133.255	AS9781 GREEN CABLE TELEVISION STATION	`5.84ms` from Seoul, KR
121.55.135.255	AS9781 GREEN CABLE TELEVISION STATION	`5.66ms` from Seoul, KR
121.55.136.255	AS9781 GREEN CABLE TELEVISION STATION	`5.97ms` from Seoul, KR
121.55.132.255	AS9781 GREEN CABLE TELEVISION STATION	`6.03ms` from Seoul, KR
121.55.130.0	AS9781 GREEN CABLE TELEVISION STATION	`5.71ms` from Seoul, KR
121.55.142.255	AS9781 GREEN CABLE TELEVISION STATION	`5.65ms` from Seoul, KR
121.55.140.1	AS9781 GREEN CABLE TELEVISION STATION	`6.10ms` from Seoul, KR
121.55.141.1	AS9781 GREEN CABLE TELEVISION STATION	`5.77ms` from Seoul, KR
121.55.137.0	AS9781 GREEN CABLE TELEVISION STATION	`5.82ms` from Seoul, KR
121.55.139.255	AS9781 GREEN CABLE TELEVISION STATION	`5.64ms` from Seoul, KR
121.55.143.255	AS9781 GREEN CABLE TELEVISION STATION	`5.51ms` from Seoul, KR
121.55.131.0	AS9781 GREEN CABLE TELEVISION STATION	`5.43ms` from Seoul, KR
121.55.134.0	AS9781 GREEN CABLE TELEVISION STATION	`5.57ms` from Seoul, KR
121.55.138.255	AS9781 GREEN CABLE TELEVISION STATION	`5.76ms` 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
197.48.90.84	AS8452 TE-AS	`7.47ms` from Cairo, EG
13.245.157.84	AS16509 Amazon.com, Inc.	`0.12ms` from Cape Town, ZA
40.131.181.212	AS7029 Windstream Communications LLC	`12.46ms` from Dallas, US
63.35.125.36	AS16509 Amazon.com, Inc.	`0.10ms` from Dublin, IE
185.206.58.180	AS209854 Cyberzone S.A.	`0.30ms` from Frankfurt am Main, DE
189.231.108.116	AS8151 UNINET	`15.04ms` from Phoenix, US
27.200.110.212	AS4837 CHINA UNICOM China169 Backbone	`5.54ms` from Qingdao, CN
112.242.9.196	AS4837 CHINA UNICOM China169 Backbone	`7.40ms` from Qingdao, CN
143.225.206.180	AS137 Consortium GARR	`6.46ms` from Rome, IT
146.190.175.228	AS14061 DigitalOcean, LLC	`0.25ms` from Santa Clara, US
107.213.152.212	AS7018 AT&T Enterprises, LLC	`18.32ms` from Santa Clara, US
39.119.39.212	AS9318 SK Broadband Co Ltd	`3.66ms` from Seoul, KR
202.204.52.116	AS4538 China Education and Research Network Center	`3.28ms` from Beijing, CN
185.2.56.36	AS34219 Arche NetVision GmbH	`4.13ms` from Berlin, DE
99.91.204.20	AS7018 AT&T Enterprises, LLC	`9.91ms` from Chicago, US
3.134.105.52	AS16509 Amazon.com, Inc.	`0.97ms` from Columbus, US
79.206.195.4	AS3320 Deutsche Telekom AG	`2.05ms` from Frankfurt am Main, DE
223.17.105.244	AS9304 HGC Global Communications Limited	`1.42ms` from Hong Kong, HK
160.30.38.36	AS139490 Aspt Networks Pvt Ltd	`1.21ms` from Hyderabad, IN
124.82.123.180	AS4788 TM TECHNOLOGY SERVICES SDN. BHD.	`5.62ms` from Kuala Lumpur, MY
109.86.69.100	AS13188 CONTENT DELIVERY NETWORK LTD	`0.72ms` from Kyiv, UA
64.86.244.20	AS6453 TATA COMMUNICATIONS (AMERICA) INC	`0.72ms` from Montreal, CA
79.125.110.180	AS16509 Amazon.com, Inc.	`0.21ms` from Dublin, IE
84.175.138.132	AS3320 Deutsche Telekom AG	`4.19ms` from Hamburg, DE
123.203.74.84	AS9269 Hong Kong Broadband Network Ltd.	`1.06ms` from Hong Kong, HK

Traceroute

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

traceroute -a -n -q1 -f2 121.55.139.51

traceroute to 121.55.139.51 (121.55.139.51): 64 hops max, 52 byte packets

2 [AS9848] 61.250.82.93 1.341 ms

3 [AS9848] 211.115.193.78 2.199 ms

4 [AS9848] 211.115.200.107 6.943 ms

5 *

6 *

7 [AS9781] 121.55.64.100 6.807 ms

8 *

9 *

10 [AS9781] 121.55.139.51 13.038 ms

Measurement taken from

IPinfo ProbeNet in Seoul, KR

On December 14th 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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