121.129.0.0/16

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Summary

IP address summary information
ASNs	2
Countries	1
BGP Prefixes	2
Routers	24
Pingable IPs	35,896

South Korea
100.00%


121.129.0.0/24	South Korea100.00%	1	1	0
121.129.1.0/24	South Korea100.00%	1	1	0
121.129.2.0/24	South Korea100.00%	1	1	0
121.129.3.0/24	South Korea100.00%	1	1	0
121.129.4.0/24	South Korea100.00%	1	1	1
121.129.5.0/24	South Korea100.00%	1	1	1
121.129.6.0/24	South Korea100.00%	1	1	0
121.129.7.0/24	South Korea100.00%	1	1	0
121.129.8.0/24	South Korea100.00%	1	1	0
121.129.9.0/24	South Korea100.00%	1	1	0

Sub-ranges

Important routers in 121.129.0.0/16


121.129.56.1	Seoul, South Korea	AS4766Korea Telecom
121.129.32.219	Seoul, South Korea	AS4766Korea Telecom
121.129.187.2	Seoul, South Korea	AS4766Korea Telecom
121.129.104.254	Bucheon-si, South Korea	AS4766Korea Telecom
121.129.9.75	Seoul, South Korea	AS4766Korea Telecom
121.129.74.53	Seoul, South Korea	AS4766Korea Telecom
121.129.23.72	Seoul, South Korea	AS4766Korea Telecom
121.129.111.47	Seoul, South Korea	AS4766Korea Telecom
121.129.27.15	Seoul, South Korea	AS4766Korea Telecom
121.129.29.237	Incheon, South Korea	AS4766Korea Telecom

Important routers in 121.129.0.0/16

Pingable IPs

35,896 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.


121.129.167.74	AS4766Korea Telecom	1.53ms from Incheon, KR
121.129.252.209	AS4766Korea Telecom	1.41ms from Incheon, KR
121.129.245.208	AS4766Korea Telecom	1.29ms from Incheon, KR
121.129.234.62	AS4766Korea Telecom	1.56ms from Incheon, KR
121.129.143.58	AS4766Korea Telecom	1.41ms from Incheon, KR
121.129.196.254	AS4766Korea Telecom	1.44ms from Incheon, KR
121.129.165.122	AS4766Korea Telecom	1.47ms from Incheon, KR
121.129.248.195	AS4766Korea Telecom	1.40ms from Incheon, KR
121.129.201.143	AS4766Korea Telecom	1.33ms from Incheon, KR
121.129.205.206	AS4766Korea Telecom	1.43ms 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.


3.136.206.16	AS16509Amazon.com, Inc.	0.13ms from Columbus, US
151.81.114.80	AS1267WIND TRE S.P.A.	11.33ms from Milan, IT
45.73.189.64	AS54103MOD Mission Critical, LLC	0.51ms from New York City, US
193.156.42.240	AS224Sikt - Kunnskapssektorens Tjenesteleverandor	1.65ms from Sandefjord, NO
18.139.109.0	AS16509Amazon.com, Inc.	0.16ms from Singapore, SG
175.174.122.0	AS4837CHINA UNICOM China169 Backbone	8.38ms from Tieling, CN
52.83.244.112	AS135629Ningxia West Cloud Data Technology Co.Ltd.	1.20ms from Zhongwei, CN
3.143.171.224	AS16509Amazon.com, Inc.	0.17ms from Columbus, US
34.42.232.48	AS396982Google LLC	0.15ms from Council Bluffs, US
204.14.108.80	AS47007Colocation America Corporation	0.76ms from Los Angeles, US

Pingable IPs

Traceroute

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

$ traceroute -a -n -q1 -f3 -m18 121.129.254.2

traceroute to 121.129.254.2 (121.129.254.2): 18 hops max, 52 byte packets

3 [AS174] 154.24.44.85 4.365 ms

4 [AS174] 154.54.29.178 16.687 ms

5 [AS174] 154.54.171.234 15.802 ms

6 [AS174] 154.54.170.161 25.829 ms

7 [AS174] 154.54.165.30 36.444 ms

8 [AS174] 154.54.166.70 45.084 ms

9 [AS174] 154.54.45.162 55.39 ms

10 [AS174] 154.54.3.70 55.522 ms

11 [AS174] 144.223.171.102 57.739 ms

12 [AS4766] 112.174.80.21 67.215 ms

13 [AS4766] 112.174.88.213 188.264 ms

14 [AS4766] 112.174.91.29 187.794 ms

15 [AS4766] 112.174.49.214 200.403 ms

16 *

17 *

18 *

Measurement taken from

IPinfo ProbeNet in Guadalajara, MX

On July 22, 2026

Traceroute

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121.129.0.0/16

Summary

Sub-ranges

Important routers in 121.129.0.0/16

Important routers in 121.129.0.0/16

Pingable IPs

Other Pingable IPs

Pingable IPs

Traceroute

Traceroute

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Important routers in 121.129.0.0/16

Pingable IPs

Other Pingable IPs

Traceroute

121.129.0.0/16

Summary

Statistics

Statistics

Sub-ranges

Sub-ranges

Important routers in 121.129.0.0/16

Important routers in 121.129.0.0/16

Pingable IPs

Other Pingable IPs

Pingable IPs

Traceroute

Traceroute

An API built with users in mind: reliable, accurate, and easy-to-use

Our IP tools

What is my IP?

Map IPs

Summarize IPs

Statistics

Sub-ranges

Important routers in 121.129.0.0/16

Pingable IPs

Other Pingable IPs

Traceroute