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CIDR Range

121.154.0.0/16

65.5K IPs /16 Korea Telecom AS4766 South Korea APNIC
Addresses
65,536
65.5K
IP Range
121.154.0.0
→ 121.154.255.255
Sub-ranges
17+
within this block
PTR Density
0.0%
1 of 65.5K IPs have PTR

Reputation · trust score

A transparent 0–100 signal. Every entity starts at a neutral baseline of 65; threat-intel blocklists, exposure, reverse-DNS, routing and allocation each adjust it up or down. Higher is more trustworthy.

81/100
Trusted
How this score is built

Experimental · trust-vectors model v1.1.0 — a transparent heuristic, not a definitive verdict. How it works →

Ranges inside 121.154.0.0/16

CIDRIPsOrganizationASNCountry
121.154.0.0/19 8.2K Korea Telecom AS4766 KR
121.154.32.0/19 8.2K Korea Telecom AS4766 KR
121.154.96.0/19 8.2K Korea Telecom AS4766 KR
121.154.224.0/20 4.1K Korea Telecom AS4766 KR
121.154.208.0/20 4.1K Korea Telecom AS4766 KR
121.154.192.0/20 4.1K Korea Telecom AS4766 KR
121.154.176.0/20 4.1K Korea Telecom AS4766 KR
121.154.160.0/20 4.1K Korea Telecom AS4766 KR
121.154.144.0/20 4.1K Korea Telecom AS4766 KR
121.154.128.0/20 4.1K Korea Telecom AS4766 KR
121.154.112.0/20 4.1K Korea Telecom AS4766 KR
121.154.96.0/20 4.1K Korea Telecom AS4766 KR
121.154.80.0/20 4.1K Korea Telecom AS4766 KR
121.154.64.0/20 4.1K Korea Telecom AS4766 KR
121.154.240.0/20 4.1K Korea Telecom AS4766 KR
121.154.192.0/21 2.0K Korea Telecom AS4766 KR
121.154.200.0/21 2.0K Korea Telecom AS4766 KR

Geolocation

First 256 of 65,536 IP addresses in 121.154.0.0/16

121.154.0.0 121.154.0.1 121.154.0.2 121.154.0.3 121.154.0.4 121.154.0.5 121.154.0.6 121.154.0.7 121.154.0.8 121.154.0.9 121.154.0.10 121.154.0.11 121.154.0.12 121.154.0.13 121.154.0.14 121.154.0.15 121.154.0.16 121.154.0.17 121.154.0.18 121.154.0.19 121.154.0.20 121.154.0.21 121.154.0.22 121.154.0.23 121.154.0.24 121.154.0.25 121.154.0.26 121.154.0.27 121.154.0.28 121.154.0.29 121.154.0.30 121.154.0.31 121.154.0.32 121.154.0.33 121.154.0.34 121.154.0.35 121.154.0.36 121.154.0.37 121.154.0.38 121.154.0.39 121.154.0.40 121.154.0.41 121.154.0.42 121.154.0.43 121.154.0.44 121.154.0.45 121.154.0.46 121.154.0.47 121.154.0.48 121.154.0.49 121.154.0.50 121.154.0.51 121.154.0.52 121.154.0.53 121.154.0.54 121.154.0.55 121.154.0.56 121.154.0.57 121.154.0.58 121.154.0.59 121.154.0.60 121.154.0.61 121.154.0.62 121.154.0.63 121.154.0.64 121.154.0.65 121.154.0.66 121.154.0.67 121.154.0.68 121.154.0.69 121.154.0.70 121.154.0.71 121.154.0.72 121.154.0.73 121.154.0.74 121.154.0.75 121.154.0.76 121.154.0.77 121.154.0.78 121.154.0.79 121.154.0.80 121.154.0.81 121.154.0.82 121.154.0.83 121.154.0.84 121.154.0.85 121.154.0.86 121.154.0.87 121.154.0.88 121.154.0.89 121.154.0.90 121.154.0.91 121.154.0.92 121.154.0.93 121.154.0.94 121.154.0.95 121.154.0.96 121.154.0.97 121.154.0.98 121.154.0.99 121.154.0.100 121.154.0.101 121.154.0.102 121.154.0.103 121.154.0.104 121.154.0.105 121.154.0.106 121.154.0.107 121.154.0.108 121.154.0.109 121.154.0.110 121.154.0.111 121.154.0.112 121.154.0.113 121.154.0.114 121.154.0.115 121.154.0.116 121.154.0.117 121.154.0.118 121.154.0.119 121.154.0.120 121.154.0.121 121.154.0.122 121.154.0.123 121.154.0.124 121.154.0.125 121.154.0.126 121.154.0.127 121.154.0.128 121.154.0.129 121.154.0.130 121.154.0.131 121.154.0.132 121.154.0.133 121.154.0.134 121.154.0.135 121.154.0.136 121.154.0.137 121.154.0.138 121.154.0.139 121.154.0.140 121.154.0.141 121.154.0.142 121.154.0.143 121.154.0.144 121.154.0.145 121.154.0.146 121.154.0.147 121.154.0.148 121.154.0.149 121.154.0.150 121.154.0.151 121.154.0.152 121.154.0.153 121.154.0.154 121.154.0.155 121.154.0.156 121.154.0.157 121.154.0.158 121.154.0.159 121.154.0.160 121.154.0.161 121.154.0.162 121.154.0.163 121.154.0.164 121.154.0.165 121.154.0.166 121.154.0.167 121.154.0.168 121.154.0.169 121.154.0.170 121.154.0.171 121.154.0.172 121.154.0.173 121.154.0.174 121.154.0.175 121.154.0.176 121.154.0.177 121.154.0.178 121.154.0.179 121.154.0.180 121.154.0.181 121.154.0.182 121.154.0.183 121.154.0.184 121.154.0.185 121.154.0.186 121.154.0.187 121.154.0.188 121.154.0.189 121.154.0.190 121.154.0.191 121.154.0.192 121.154.0.193 121.154.0.194 121.154.0.195 121.154.0.196 121.154.0.197 121.154.0.198 121.154.0.199 121.154.0.200 121.154.0.201 121.154.0.202 121.154.0.203 121.154.0.204 121.154.0.205 121.154.0.206 121.154.0.207 121.154.0.208 121.154.0.209 121.154.0.210 121.154.0.211 121.154.0.212 121.154.0.213 121.154.0.214 121.154.0.215 121.154.0.216 121.154.0.217 121.154.0.218 121.154.0.219 121.154.0.220 121.154.0.221 121.154.0.222 121.154.0.223 121.154.0.224 121.154.0.225 121.154.0.226 121.154.0.227 121.154.0.228 121.154.0.229 121.154.0.230 121.154.0.231 121.154.0.232 121.154.0.233 121.154.0.234 121.154.0.235 121.154.0.236 121.154.0.237 121.154.0.238 121.154.0.239 121.154.0.240 121.154.0.241 121.154.0.242 121.154.0.243 121.154.0.244 121.154.0.245 121.154.0.246 121.154.0.247 121.154.0.248 121.154.0.249 121.154.0.250 121.154.0.251 121.154.0.252 121.154.0.253 121.154.0.254 121.154.0.255 + 65.3K more (range too large to list inline)

BGP Routing

Live BGP anomalies →

Not announced as an exact prefix — covered by the announced supernet 121.144.0.0/12.

Announced prefix
121.144.0.0/12
Origin AS
AS4766
Announcement samples
6,791
Last seen
2026-07-18 10:52:50

RIR Ownership History

Atom feed ⇲

Allocation changes captured weekly from regional internet registry (RIR) delegation files.

Date Event From To
2026-05-10 New Allocation — KR

Frequently Asked Questions

What is 121.154.0.0/16?

121.154.0.0/16 is a CIDR network block containing 65,536 IPv4 addresses (from 121.154.0.0 to 121.154.255.255). CIDR notation combines an IP address with a prefix length to define a range of addresses.

Who owns the 121.154.0.0/16 network?

The 121.154.0.0/16 range is allocated to Korea Telecom and announced via AS4766 from South Korea.

Last updated: 2026-07-18 11:25:31 UTC
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