121.254.56.0/23

AS23563 · SK Broadband Co Ltd

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Summary

Country	South Korea
Domain	skbroadband.com
ASN	AS23563
Registry	APNIC
ID	TBROAD

WHOIS Details

inetnum:        121.254.0.0 - 121.254.63.255
netname:        broadNnet
descr:          SK Broadband Co Ltd
country:        KR
admin-c:        IM670-AP
tech-c:         IM670-AP
status:         ALLOCATED PORTABLE
mnt-by:         MNT-KRNIC-AP
mnt-irt:        IRT-KRNIC-KR
last-modified:  2020-12-29T05:46:12Z
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:        Seoul Jung-gu Toegye-ro 24
country:        KR
phone:          +82-80-828-2106
e-mail:         ip-adm@skbroadband.com
nic-hdl:        IM670-AP
mnt-by:         MNT-KRNIC-AP
last-modified:  2021-10-05T05:20:03Z
source:         APNIC

inetnum:        121.254.0.0 - 121.254.63.255
netname:        broadNnet-KR
descr:          SK Broadband Co Ltd
country:        KR
admin-c:        IM12-KR
tech-c:         IM12-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:        Seoul Jung-gu Toegye-ro 24
address:        SK Namsan Green Bldg.
country:        KR
phone:          +82-80-828-2106
e-mail:         ip-adm@skbroadband.com
nic-hdl:        IM12-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

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Useful for Cybersecurity

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Pingable IPs

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

IP Address	ASN	Details
121.254.56.1	AS23563 SK Broadband Co Ltd	`1.53ms` from Seoul, KR
121.254.57.1	AS23563 SK Broadband Co Ltd	`1.53ms` 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
20.120.58.151	AS8075 Microsoft Corporation	`0.33ms` from Ashburn, US
154.114.44.7	AS2018 TENET (The UNINET Project)	`1.24ms` from Cape Town, ZA
98.3.38.135	AS11351 Charter Communications Inc	`19.31ms` from Chicago, US
176.130.54.119	AS5410 Bouygues Telecom SA	`9.26ms` from Frankfurt am Main, DE
113.226.105.215	AS4837 CHINA UNICOM China169 Backbone	`10.52ms` from Liaoyang, CN
78.141.196.39	AS20473 The Constant Company, LLC	`0.12ms` from London, GB
52.39.166.7	AS16509 Amazon.com, Inc.	`4.59ms` from Portland, US
3.81.53.7	AS14618 Amazon.com, Inc.	`0.59ms` from Reston, US
47.123.209.55	AS37963 Hangzhou Alibaba Advertising Co.,Ltd.	`2.62ms` from Shanghai, CN
106.105.146.87	AS131602 Hsin Yeong An Cable TV Co., Ltd.	`15.80ms` from Taipei, TW
46.149.222.7	AS52195 AP-MEDIA Spolka z ograniczona odpowiedzalnoscia	`7.05ms` from Warsaw, PL
121.63.123.247	AS4134 CHINANET-BACKBONE	`7.12ms` from Wuhan, CN
193.206.158.87	AS137 Consortium GARR	`3.83ms` from Arezzo, IT
76.215.136.167	AS7018 AT&T Enterprises, LLC	`3.67ms` from Atlanta, US
223.206.211.39	AS45758 Triple T Broadband Public Company Limited	`10.48ms` from Bangkok, TH
190.27.129.103	AS19429 ETB - Colombia	`1.08ms` from Bogota, CO
195.62.90.247	AS49935 SmartEye B.V	`1.97ms` from Brussels, BE
146.148.81.39	AS396982 Google LLC	`0.13ms` from Council Bluffs, US
91.7.227.119	AS3320 Deutsche Telekom AG	`2.69ms` from Duesseldorf, DE
121.40.152.151	AS37963 Hangzhou Alibaba Advertising Co.,Ltd.	`4.40ms` from Hangzhou, CN
121.202.125.231	AS17924 SmarTone Mobile Communications Ltd	`10.71ms` from Hong Kong, HK
156.251.150.7	AS40065 CNSERVERS LLC	`0.93ms` from Hong Kong, HK
202.60.15.7	AS24298 Apollo Global Net AS, Application Service Provider, Manila	`0.47ms` from Manila, PH
54.245.29.231	AS16509 Amazon.com, Inc.	`4.59ms` from Portland, US
46.174.111.23	AS49505 JSC Selectel	`0.94ms` from Saint Petersburg, RU

Traceroute

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

traceroute -a -n -q1 -f5 121.254.57.216

traceroute to 121.254.57.216 (121.254.57.216): 64 hops max, 52 byte packets

5 [AS9318] 110.9.3.45 22.43 ms

6 *

7 *

8 *

9 *

10 [AS23563] 121.254.57.216 10.472 ms

Measurement taken from

IPinfo ProbeNet in Seoul, KR

On August 28th 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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