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

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

IP Address	ASN	Details
121.55.138.255	AS9781 GREEN CABLE TELEVISION STATION	`5.75ms` from Seoul, KR
121.55.141.1	AS9781 GREEN CABLE TELEVISION STATION	`5.74ms` from Seoul, KR
121.55.142.0	AS9781 GREEN CABLE TELEVISION STATION	`5.92ms` from Seoul, KR
121.55.137.0	AS9781 GREEN CABLE TELEVISION STATION	`5.85ms` from Seoul, KR
121.55.135.1	AS9781 GREEN CABLE TELEVISION STATION	`5.64ms` from Seoul, KR
121.55.143.255	AS9781 GREEN CABLE TELEVISION STATION	`5.55ms` from Seoul, KR
121.55.132.0	AS9781 GREEN CABLE TELEVISION STATION	`5.16ms` from Seoul, KR
121.55.140.0	AS9781 GREEN CABLE TELEVISION STATION	`5.46ms` from Seoul, KR
121.55.136.1	AS9781 GREEN CABLE TELEVISION STATION	`5.82ms` from Seoul, KR
121.55.130.0	AS9781 GREEN CABLE TELEVISION STATION	`5.66ms` from Seoul, KR
121.55.139.0	AS9781 GREEN CABLE TELEVISION STATION	`5.88ms` from Seoul, KR
121.55.128.255	AS9781 GREEN CABLE TELEVISION STATION	`5.52ms` from Seoul, KR
121.55.133.0	AS9781 GREEN CABLE TELEVISION STATION	`5.45ms` from Seoul, KR
121.55.134.1	AS9781 GREEN CABLE TELEVISION STATION	`5.56ms` from Seoul, KR
121.55.131.0	AS9781 GREEN CABLE TELEVISION STATION	`5.42ms` from Seoul, KR
121.55.129.1	AS9781 GREEN CABLE TELEVISION STATION	`5.46ms` 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
75.68.206.20	AS7922 Comcast Cable Communications, LLC	`9.86ms` from Boston, US
3.68.126.52	AS16509 Amazon.com, Inc.	`0.12ms` from Frankfurt am Main, DE
41.181.127.20	AS16637 MTN SA	`1.20ms` from Johannesburg, ZA
62.57.185.100	AS6739 VODAFONE ONO, S.A.	`7.89ms` from Madrid, ES
97.102.61.164	AS33363 Charter Communications, Inc	`10.27ms` from Orlando, US
218.155.75.36	AS4766 Korea Telecom	`1.70ms` from Seoul, KR
52.221.202.4	AS16509 Amazon.com, Inc.	`0.13ms` from Singapore, SG
114.35.15.180	AS3462 Data Communication Business Group	`3.06ms` from Taipei, TW
86.81.83.164	AS1136 KPN B.V.	`1.70ms` from Amsterdam, NL
108.243.61.212	AS7018 AT&T Enterprises, LLC	`11.08ms` from Atlanta, US
177.43.20.4	AS18881 TELEFÔNICA BRASIL S.A	`0.49ms` from Brasilia, BR
34.35.44.36	AS396982 Google LLC	`0.18ms` from Johannesburg, ZA
91.103.131.4	AS3213 Bogons Ltd	`0.42ms` from London, GB
181.204.214.180	AS27831 Colombia Móvil	`14.71ms` from Medellin, CO
201.145.67.116	AS8151 UNINET	`1.52ms` from Mexico City, MX
216.71.229.68	AS18780 Reservation Telephone Coop.	`19.45ms` from Minneapolis, US
60.103.28.68	AS17676 SoftBank Corp.	`18.38ms` from Osaka, JP
71.185.171.132	AS701 Verizon Business	`2.09ms` from Philadelphia, US
49.173.113.164	AS17858 LG POWERCOMM	`1.85ms` from Seoul, KR
58.110.245.196	AS4804 Microplex PTY LTD	`5.44ms` from Sydney, AU
62.47.245.100	AS8447 A1 Telekom Austria AG	`0.58ms` from Vienna, AT
185.220.224.180	AS202468 AbrArvan CDN and IaaS	`14.80ms` from Yerevan, AM
156.45.99.244	AS30103 Zoom Video Communications, Inc	`0.20ms` from Ashburn, US
20.173.71.180	AS8075 Microsoft Corporation	`0.15ms` from Az Za`ayin, QA
45.93.3.68	AS203061 UAB code200	`0.30ms` from Dallas, US

Traceroute

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

traceroute -a -n -q1 -f4 121.55.136.1

traceroute to 121.55.136.1 (121.55.136.1): 64 hops max, 52 byte packets

4 [AS9848] 211.115.200.107 6.585 ms

5 *

6 [AS9781] 121.55.64.254 6.333 ms

7 [AS9781] 121.55.136.1 6.112 ms

Measurement taken from

IPinfo ProbeNet in Seoul, KR

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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