121.55.136.0/21

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:         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:        Daegu Dalseo-gu Dalgubeol-daero 1611
country:        KR
phone:          +82-53-551-2009
e-mail:         ys0964@gcs.co.kr
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:         ys0964@gcs.co.kr
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:         ys0964@gcs.co.kr
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 121.55.136.0/21

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

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

IP Address	ASN	Details
121.55.139.0	AS9781 GREEN CABLE TELEVISION STATION	`5.23ms` from Seoul, KR
121.55.142.255	AS9781 GREEN CABLE TELEVISION STATION	`5.74ms` from Seoul, KR
121.55.141.1	AS9781 GREEN CABLE TELEVISION STATION	`5.77ms` from Seoul, KR
121.55.140.0	AS9781 GREEN CABLE TELEVISION STATION	`5.93ms` from Seoul, KR
121.55.136.1	AS9781 GREEN CABLE TELEVISION STATION	`5.33ms` from Seoul, KR
121.55.138.255	AS9781 GREEN CABLE TELEVISION STATION	`5.80ms` from Seoul, KR
121.55.137.0	AS9781 GREEN CABLE TELEVISION STATION	`5.70ms` from Seoul, KR
121.55.143.255	AS9781 GREEN CABLE TELEVISION STATION	`5.54ms` 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
77.46.164.181	AS8400 TELEKOM SRBIJA a.d.	`0.44ms` from Belgrade, RS
92.52.237.37	AS20845 DIGI Tavkozlesi es Szolgaltato Kft.	`1.55ms` from Budapest, HU
118.251.44.165	AS4134 CHINANET-BACKBONE	`2.29ms` from Changsha, CN
165.166.89.53	AS2711 Spirit Communications	`0.84ms` from Charlotte, US
74.139.152.53	AS10796 Charter Communications Inc	`13.37ms` from Columbus, US
195.179.17.37	AS61157 PlusServer GmbH	`6.57ms` from Duesseldorf, DE
121.33.143.21	AS4134 CHINANET-BACKBONE	`3.31ms` from Guangzhou, CN
217.41.76.149	AS2856 British Telecommunications PLC	`2.39ms` from London, GB
86.171.254.197	AS2856 British Telecommunications PLC	`3.33ms` from London, GB
88.9.146.245	AS3352 TELEFONICA DE ESPANA S.A.U.	`7.94ms` from Madrid, ES
112.209.223.149	AS9299 Philippine Long Distance Telephone Company	`4.22ms` from Manila, PH
176.179.123.5	AS5410 Bouygues Telecom SA	`6.93ms` from Paris, FR
65.62.39.197	AS8011 MongoDB, Inc.	`0.12ms` from Paris, FR
54.91.74.69	AS14618 Amazon.com, Inc.	`0.24ms` from Reston, US
203.229.38.133	AS9689 SK Broadband Co Ltd	`2.39ms` from Seoul, KR
52.105.23.53	AS8075 Microsoft Corporation	`0.25ms` from Amsterdam, NL
124.207.162.245	AS4808 China Unicom Beijing Province Network	`5.19ms` from Beijing, CN
35.238.87.53	AS396982 Google LLC	`0.12ms` from Council Bluffs, US
83.8.231.101	AS5617 Orange Polska Spolka Akcyjna	`6.13ms` from Gdansk, PL
212.144.99.133	AS3209 Vodafone GmbH	`1.16ms` from Hamburg, DE
212.11.163.37	AS42428 Gulf Computer Services Co Ldt	`5.57ms` from Jeddah, SA
154.63.9.117	AS174 Cogent Communications, LLC	`11.36ms` from Madrid, ES
176.85.46.101	AS3352 TELEFONICA DE ESPANA S.A.U.	`11.93ms` from Madrid, ES
64.135.90.229	AS13645 BroadbandONE, LLC	`1.81ms` from Miami, US
35.243.252.133	AS396982 Google LLC	`0.14ms` from Moncks Corner, US

Traceroute

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

traceroute -a -n -q1 121.55.136.1

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

1 [AS15169] 172.253.64.143 1.137 ms

2 [AS9848] 61.250.82.93 1.174 ms

3 [AS9848] 211.115.197.13 1.194 ms

4 [AS9848] 211.239.208.130 6.517 ms

5 [AS9848] 203.231.94.198 6.031 ms

6 [AS9781] 121.55.64.246 6.159 ms

7 [AS9781] 121.55.136.1 6.231 ms

Measurement taken from

IPinfo ProbeNet in Seoul, KR

On November 14th 2025

What are IP address ranges?

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