121.55.128.0/21

AS9781 · GREEN CABLE TELEVISION STATION

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Summary

Country	South Korea
Domain	gcs.co.kr
ASN	AS9781
Registry	APNIC
ID	GCS

WHOIS Details

inetnum:        121.55.64.0 - 121.55.191.255
netname:        GCS
descr:          GREEN CABLE TELEVISION STATION
admin-c:        IM706-AP
tech-c:         IM706-AP
country:        KR
status:         ALLOCATED PORTABLE
mnt-by:         MNT-KRNIC-AP
mnt-irt:        IRT-KRNIC-KR
last-modified:  2017-02-02T01:24:38Z
source:         APNIC

irt:            IRT-KRNIC-KR
address:        Jeollanam-do Naju-si Jinheung-gil
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:  2021-06-15T06:21:49Z
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:        121.55.64.0 - 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.
changed:        hostmaster@nic.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
changed:        hostmaster@nic.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
changed:        hostmaster@nic.or.kr
source:         KRNIC

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

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

IP Address	ASN	Details
121.55.130.1	AS9781 GREEN CABLE TELEVISION STATION	`5.54ms` from Seoul, KR
121.55.131.1	AS9781 GREEN CABLE TELEVISION STATION	`5.95ms` from Seoul, KR
121.55.134.1	AS9781 GREEN CABLE TELEVISION STATION	`5.71ms` from Seoul, KR
121.55.132.0	AS9781 GREEN CABLE TELEVISION STATION	`5.47ms` from Seoul, KR
121.55.135.0	AS9781 GREEN CABLE TELEVISION STATION	`5.39ms` from Seoul, KR
121.55.128.255	AS9781 GREEN CABLE TELEVISION STATION	`5.68ms` from Seoul, KR
121.55.129.255	AS9781 GREEN CABLE TELEVISION STATION	`5.58ms` from Seoul, KR
121.55.133.0	AS9781 GREEN CABLE TELEVISION STATION	`5.55ms` 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
105.108.57.245	AS36947 Telecom Algeria	`15.42ms` from Algiers, DZ
51.158.30.21	AS12876 SCALEWAY S.A.S.	`0.24ms` from Amsterdam, NL
100.15.217.213	AS701 Verizon Business	`1.90ms` from Ashburn, US
185.231.64.245	AS212086 Bazovaya Set LLP	`3.93ms` from Astana, KZ
162.151.216.181	AS7922 Comcast Cable Communications, LLC	`0.94ms` from Boston, US
174.71.85.5	AS22773 Cox Communications Inc.	`13.77ms` from Chicago, US
13.69.213.85	AS8075 Microsoft Corporation	`0.31ms` from Dublin, IE
152.228.161.149	AS16276 OVH SAS	`0.10ms` from Gravelines, FR
16.162.148.229	AS16509 Amazon.com, Inc.	`0.11ms` from Hong Kong, HK
5.138.235.197	AS12389 PJSC Rostelecom	`1.20ms` from Krasnodar, RU
86.180.91.53	AS2856 British Telecommunications PLC	`6.41ms` from London, GB
174.78.168.5	AS22773 Cox Communications Inc.	`1.82ms` from Los Angeles, US
12.124.106.213	AS7018 AT&T Enterprises, LLC	`1.31ms` from Los Angeles, US
37.195.132.101	AS31200 Novotelecom Ltd	`1.28ms` from Novosibirsk, RU
202.229.97.197	AS2514 NTT PC Communications, Inc.	`4.61ms` from Osaka, JP
44.224.128.69	AS16509 Amazon.com, Inc.	`4.48ms` from Portland, US
34.195.138.213	AS14618 Amazon.com, Inc.	`0.16ms` from Reston, US
167.105.211.37	AS8075 Microsoft Corporation	`1.34ms` from Taipei, TW
85.185.206.149	AS58224 Iran Telecommunication Company PJS	`8.55ms` from Yerevan, AM
210.213.22.245	AS7470 TRUE INTERNET Co.,Ltd.	`2.72ms` from Bangkok, TH
1.119.56.69	AS58851 Priority of Fashion(Beijing)Information Technology Co.,Ltd	`5.22ms` from Beijing, CN
76.191.18.5	AS33097 Volo Broadband	`2.85ms` from Chicago, US
12.23.103.117	AS7018 AT&T Enterprises, LLC	`3.60ms` from Chicago, US
74.134.252.85	AS10796 Charter Communications Inc	`19.23ms` from Columbus, US
199.36.137.53	AS26405 HORIZON DATA SOLUTIONS, LLC	`1.71ms` 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 121.55.134.50

traceroute to 121.55.134.50 (121.55.134.50): 64 hops max, 52 byte packets

1 [AS15169] 172.253.64.143 0.818 ms

2 [AS9848] 61.250.82.89 1.114 ms

3 [AS9848] 211.116.176.72 1.1 ms

4 [AS9848] 211.239.208.139 6.504 ms

5 [AS9848] 203.231.94.198 6.209 ms

6 [AS9781] 121.55.64.250 6.393 ms

7 [AS9781] 121.55.64.100 6.457 ms

8 [AS9781] 121.55.134.50 14.516 ms

Measurement taken from

IPinfo ProbeNet in Seoul, KR

On September 11th 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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