121.128.219.0/24

AS9647 · Seoul Metropolitan Government

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Summary

Country	South Korea
Domain	kt.com
ASN	AS9647
Parent Range	121.128.0.0/11
Registry	KRNIC
ID	121.128.219.0-121.128.219.255

WHOIS Details

inetnum:            121.128.219.0 - 121.128.219.255
descr:              Korea Telecom
network-type:       CUSTOMER
address:            90 Buljeongro Bundang-Gu Seongnam-Si Gyeonggi-Do
zip-code:           13606
created:            2023-03-22
admin:              GENERATED-KRNIC-IP-MANAGER-KORNETIP
country:            KR
source:             KRNIC

nic-hdl:            GENERATED-KRNIC-IP-MANAGER-KORNETIP
person:             IP Manager
name:               IP Manager
phone:              +82-2-500-6630
e-mail:             kornet_ip@kt.com
source:             KRNIC

Overlapping Ranges

BGP prefixes that contain 121.128.219.0/24

Range	ASN	Company	Num of IPs
121.128.0.0/11	AS17588	Korea Telecom	2,097,152
121.128.0.0/11	AS18333	Korea Telecom	2,097,152
121.128.0.0/11	AS38122	Korea Telecom	2,097,152
121.128.0.0/11	AS4766	Korea Telecom	2,097,152
121.128.0.0/11	AS9647	Korea Telecom	2,097,152
121.128.0.0/11	AS9856	Korea Telecom	2,097,152

Nearby Ranges

BGP prefixes that overlap with 121.128.0.0/16

Range	ASN	Company	Num of IPs
121.128.0.0/11	AS9856	Korea Telecom	2,097,152
121.128.0.0/11	AS17588	Korea Telecom	2,097,152
121.128.0.0/11	AS18333	Korea Telecom	2,097,152
121.128.0.0/11	AS38122	Korea Telecom	2,097,152
121.128.0.0/11	AS4766	Korea Telecom	2,097,152
121.128.0.0/11	AS9647	Korea Telecom	2,097,152
121.128.97.0/24	AS152214	Korea Telecom	256

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

No IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

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
54.80.176.232	AS14618 Amazon.com, Inc.	`0.55ms` from Ashburn, US
190.127.131.184	AS26611 COMUNICACIÓN CELULAR S.A. COMCEL S.A.	`15.04ms` from Bogota, CO
122.137.113.120	AS4837 CHINA UNICOM China169 Backbone	`3.50ms` from Changchun, CN
124.162.24.72	AS4837 CHINA UNICOM China169 Backbone	`1.38ms` from Chongqing, CN
52.212.74.24	AS16509 Amazon.com, Inc.	`0.21ms` from Dublin, IE
123.23.89.152	AS45899 VNPT Corp	`2.80ms` from Ho Chi Minh City, VN
156.246.196.104	AS44559 IT HOSTLINE LTD	`0.32ms` from Istanbul, TR
35.177.216.104	AS16509 Amazon.com, Inc.	`0.16ms` from London, GB
13.235.207.72	AS16509 Amazon.com, Inc.	`0.16ms` from Mumbai, IN
37.41.54.40	AS28885 OmanTel NAP	`2.88ms` from Muscat, OM
13.93.153.8	AS8075 Microsoft Corporation	`0.60ms` from San Jose, US
211.46.80.120	AS55615 DOUZONEBIZON	`3.02ms` from Seoul, KR
39.122.238.88	AS9318 SK Broadband Co Ltd	`2.14ms` from Seoul, KR
8.214.177.88	AS45102 Alibaba (US) Technology Co., Ltd.	`1.49ms` from Singapore, SG
222.251.63.216	AS131142 Asia Pacific On-Line Service Inc.	`0.61ms` from Taipei, TW
153.144.103.232	AS4713 NTT DOCOMO BUSINESS,Inc.	`15.27ms` from Tokyo, JP
180.52.4.56	AS4713 NTT DOCOMO BUSINESS,Inc.	`7.52ms` from Tokyo, JP
76.223.19.24	AS16509 Amazon.com, Inc.	`0.04ms` from Bangkok, TH
128.127.121.136	AS8953 Orange Romania S.A.	`13.43ms` from Bucharest, RO
105.72.201.104	AS36884 Wana Corporate	`5.29ms` from Casablanca, MA
47.189.48.88	AS5650 Frontier Communications of America, Inc.	`1.72ms` from Dallas, US
67.63.60.232	AS16509 Amazon.com, Inc.	`1.72ms` from Frankfurt am Main, DE
47.83.192.40	AS45102 Alibaba (US) Technology Co., Ltd.	`0.42ms` from Hong Kong, HK
16.79.19.168	AS16509 Amazon.com, Inc.	`0.13ms` from Jakarta, ID
52.239.232.104	AS8075 Microsoft Corporation	`0.33ms` from Johannesburg, ZA

Traceroute

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

traceroute -a -n -q1 -f2 -m14 121.128.219.71

traceroute to 121.128.219.71 (121.128.219.71): 14 hops max, 52 byte packets

2 [AS7578] 206.148.22.141 148.228 ms

3 *

4 [] 27.111.229.142 0.927 ms

5 [AS4766] 112.174.87.137 59.817 ms

6 [AS4766] 112.174.91.205 59.471 ms

7 *

8 *

9 *

10 [AS4766] 211.217.66.82 67.946 ms

11 [AS9647] 202.14.90.137 66.437 ms

12 *

13 *

14 *

Measurement taken from

IPinfo ProbeNet in Singapore, SG

On December 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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