210.121.221.0/24

AS38676 · flexnetworks

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Summary

Country	South Korea
Domain	kt.com
ASN	AS38676
Parent Range	210.121.128.0/17
Registry	KRNIC
ID	KORNET-KR

WHOIS Details

inetnum:        210.121.128.0 - 210.121.255.255
netname:        KORNET-KR
descr:          Korea Telecom
country:        KR
admin-c:        IA9-KR
tech-c:         IM9-KR
status:         ALLOCATED PORTABLE
mnt-by:         MNT-KRNIC-AP
mnt-irt:        IRT-KRNIC-KR
changed:        hostmaster@nic.or.kr 20240912
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:        Gyeonggi-do Bundang-gu, Seongnam-si Buljeong-ro 90
address:        KT Head Office
country:        KR
phone:          +82-2-500-6630
e-mail:         kornet_ip@kt.com
nic-hdl:        IM9-KR
mnt-by:         MNT-KRNIC-AP
changed:        hostmaster@nic.or.kr 20240912
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:        Gyeonggi-do Bundang-gu, Seongnam-si Buljeong-ro 90
address:        KT Head Office
country:        KR
phone:          +82-2-500-6630
e-mail:         kornet_ip@kt.com
nic-hdl:        IA9-KR
mnt-by:         MNT-KRNIC-AP
changed:        hostmaster@nic.or.kr 20240912
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 210.121.221.0/24

Range	ASN	Company	Num of IPs
210.121.128.0/17	AS38676	Korea Telecom	32,768
210.121.128.0/17	AS152290	Korea Telecom	32,768
210.121.128.0/17	AS18176	Korea Telecom	32,768
210.121.128.0/17	AS10058	Korea Telecom	32,768
210.121.128.0/17	AS55627	Korea Telecom	32,768
210.121.128.0/17	AS4766	Korea Telecom	32,768

Nearby Ranges

BGP prefixes that overlap with 210.121.0.0/16

Range	ASN	Company	Num of IPs
210.121.128.0/17	AS10058	Korea Telecom	32,768
210.121.128.0/17	AS152290	Korea Telecom	32,768
210.121.128.0/17	AS18176	Korea Telecom	32,768
210.121.128.0/17	AS38676	Korea Telecom	32,768
210.121.0.0/17	AS45374	SEJONG NETWORKS	32,768
210.121.128.0/17	AS4766	Korea Telecom	32,768
210.121.128.0/17	AS55627	Korea Telecom	32,768
210.121.0.0/17	AS9848	SEJONG NETWORKS	32,768

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

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

IP Address	ASN	Details
210.121.221.11	AS38676 flexnetworks	`0.69ms` from Incheon, 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
196.12.199.104	AS36884 Wana Corporate	`2.88ms` from Casablanca, MA
162.172.119.168	AS21928 T-Mobile USA, Inc.	`18.25ms` from Chicago, US
184.18.134.120	AS5650 Frontier Communications of America, Inc.	`5.36ms` from Chicago, US
192.183.90.216	AS5650 Frontier Communications of America, Inc.	`6.18ms` from Chicago, US
149.111.203.168	AS10879 Unitedhealthcare	`5.76ms` from Des Moines, US
34.159.141.152	AS396982 Google LLC	`0.10ms` from Frankfurt am Main, DE
61.238.172.40	AS9269 Hong Kong Broadband Network Ltd.	`0.47ms` from Hong Kong, HK
64.174.221.152	AS7018 AT&T Enterprises, LLC	`1.70ms` from Los Angeles, US
47.32.60.152	AS20115 Charter Communications LLC	`7.12ms` from Minneapolis, US
209.240.97.200	AS40244 Turnkey Internet Inc.	`3.75ms` from New York City, US
68.2.39.72	AS22773 Cox Communications Inc.	`6.05ms` from Phoenix, US
110.155.195.56	AS4134 CHINANET-BACKBONE	`3.54ms` from UEruemqi, CN
152.52.66.216	AS9498 BHARTI Airtel Ltd.	`1.90ms` from Bengaluru, IN
76.16.96.248	AS7922 Comcast Cable Communications, LLC	`5.18ms` from Chicago, US
109.159.254.24	AS2856 British Telecommunications PLC	`0.73ms` from Erith, GB
114.132.228.72	AS45090 Shenzhen Tencent Computer Systems Company Limited	`1.92ms` from Guangzhou, CN
88.148.146.104	AS16086 DNA Oyj	`0.82ms` from Helsinki, FI
73.155.183.120	AS7922 Comcast Cable Communications, LLC	`9.42ms` from Houston, US
121.142.10.8	AS4766 Korea Telecom	`0.62ms` from Incheon, KR
82.219.108.72	AS30740 Exa Networks Limited	`0.57ms` from London, GB
141.92.97.216	AS8435 Lloyds Banking Group Internet Edge	`3.70ms` from London, GB
151.71.35.184	AS1267 WIND TRE S.P.A.	`6.90ms` from Milan, IT
82.185.23.56	AS3269 Telecom Italia S.p.A.	`7.16ms` from Milan, IT
69.201.82.184	AS11351 Charter Communications Inc	`19.31ms` from Piscataway, US
64.18.1.88	AS394699 ZenFi Networks LLC	`0.79ms` from Secaucus, US

Traceroute

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

traceroute -a -n -q1 210.121.221.15

traceroute to 210.121.221.15 (210.121.221.15): 64 hops max, 52 byte packets

1 [AS15169] 172.253.64.138 1.456 ms

2 *

3 *

4 [AS4766] 112.174.120.210 1.313 ms

5 *

6 [AS4766] 211.55.89.206 1.649 ms

7 *

8 [AS38676] 210.121.221.15 1.309 ms

Measurement taken from

IPinfo ProbeNet in Seoul, KR

On March 20th 2026

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.

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