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CIDR Range

221.153.0.0/16

65.5K IPs /16 Korea Telecom AS4766 South Korea APNIC
Addresses
65,536
65.5K
IP Range
221.153.0.0
→ 221.153.255.255
Sub-ranges
15+
within this block
PTR Density
0.0%
17 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 v1.2.1 — a transparent heuristic, not a definitive verdict. How it works →

Ranges inside 221.153.0.0/16

CIDRIPsOrganizationASNCountry
221.153.96.0/19 8.2K Korea Telecom AS4766 KR
221.153.0.0/20 4.1K Korea Telecom AS4766 KR
221.153.224.0/20 4.1K Korea Telecom AS4766 KR
221.153.208.0/20 4.1K Korea Telecom AS4766 KR
221.153.192.0/20 4.1K Korea Telecom AS4766 KR
221.153.176.0/20 4.1K Korea Telecom AS4766 KR
221.153.160.0/20 4.1K Korea Telecom AS4766 KR
221.153.144.0/20 4.1K Korea Telecom AS4766 KR
221.153.128.0/20 4.1K Korea Telecom AS4766 KR
221.153.80.0/20 4.1K Korea Telecom AS4766 KR
221.153.64.0/20 4.1K Korea Telecom AS4766 KR
221.153.48.0/20 4.1K Korea Telecom AS4766 KR
221.153.32.0/20 4.1K Korea Telecom AS4766 KR
221.153.16.0/20 4.1K Korea Telecom AS4766 KR
221.153.240.0/20 4.1K Korea Telecom AS4766 KR

First 256 of 65,536 IP addresses in 221.153.0.0/16

221.153.0.0 221.153.0.1 221.153.0.2 221.153.0.3 221.153.0.4 221.153.0.5 221.153.0.6 221.153.0.7 221.153.0.8 221.153.0.9 221.153.0.10 221.153.0.11 221.153.0.12 221.153.0.13 221.153.0.14 221.153.0.15 221.153.0.16 221.153.0.17 221.153.0.18 221.153.0.19 221.153.0.20 221.153.0.21 221.153.0.22 221.153.0.23 221.153.0.24 221.153.0.25 221.153.0.26 221.153.0.27 221.153.0.28 221.153.0.29 221.153.0.30 221.153.0.31 221.153.0.32 221.153.0.33 221.153.0.34 221.153.0.35 221.153.0.36 221.153.0.37 221.153.0.38 221.153.0.39 221.153.0.40 221.153.0.41 221.153.0.42 221.153.0.43 221.153.0.44 221.153.0.45 221.153.0.46 221.153.0.47 221.153.0.48 221.153.0.49 221.153.0.50 221.153.0.51 221.153.0.52 221.153.0.53 221.153.0.54 221.153.0.55 221.153.0.56 221.153.0.57 221.153.0.58 221.153.0.59 221.153.0.60 221.153.0.61 221.153.0.62 221.153.0.63 221.153.0.64 221.153.0.65 221.153.0.66 221.153.0.67 221.153.0.68 221.153.0.69 221.153.0.70 221.153.0.71 221.153.0.72 221.153.0.73 221.153.0.74 221.153.0.75 221.153.0.76 221.153.0.77 221.153.0.78 221.153.0.79 221.153.0.80 221.153.0.81 221.153.0.82 221.153.0.83 221.153.0.84 221.153.0.85 221.153.0.86 221.153.0.87 221.153.0.88 221.153.0.89 221.153.0.90 221.153.0.91 221.153.0.92 221.153.0.93 221.153.0.94 221.153.0.95 221.153.0.96 221.153.0.97 221.153.0.98 221.153.0.99 221.153.0.100 221.153.0.101 221.153.0.102 221.153.0.103 221.153.0.104 221.153.0.105 221.153.0.106 221.153.0.107 221.153.0.108 221.153.0.109 221.153.0.110 221.153.0.111 221.153.0.112 221.153.0.113 221.153.0.114 221.153.0.115 221.153.0.116 221.153.0.117 221.153.0.118 221.153.0.119 221.153.0.120 221.153.0.121 221.153.0.122 221.153.0.123 221.153.0.124 221.153.0.125 221.153.0.126 221.153.0.127 221.153.0.128 221.153.0.129 221.153.0.130 221.153.0.131 221.153.0.132 221.153.0.133 221.153.0.134 221.153.0.135 221.153.0.136 221.153.0.137 221.153.0.138 221.153.0.139 221.153.0.140 221.153.0.141 221.153.0.142 221.153.0.143 221.153.0.144 221.153.0.145 221.153.0.146 221.153.0.147 221.153.0.148 221.153.0.149 221.153.0.150 221.153.0.151 221.153.0.152 221.153.0.153 221.153.0.154 221.153.0.155 221.153.0.156 221.153.0.157 221.153.0.158 221.153.0.159 221.153.0.160 221.153.0.161 221.153.0.162 221.153.0.163 221.153.0.164 221.153.0.165 221.153.0.166 221.153.0.167 221.153.0.168 221.153.0.169 221.153.0.170 221.153.0.171 221.153.0.172 221.153.0.173 221.153.0.174 221.153.0.175 221.153.0.176 221.153.0.177 221.153.0.178 221.153.0.179 221.153.0.180 221.153.0.181 221.153.0.182 221.153.0.183 221.153.0.184 221.153.0.185 221.153.0.186 221.153.0.187 221.153.0.188 221.153.0.189 221.153.0.190 221.153.0.191 221.153.0.192 221.153.0.193 221.153.0.194 221.153.0.195 221.153.0.196 221.153.0.197 221.153.0.198 221.153.0.199 221.153.0.200 221.153.0.201 221.153.0.202 221.153.0.203 221.153.0.204 221.153.0.205 221.153.0.206 221.153.0.207 221.153.0.208 221.153.0.209 221.153.0.210 221.153.0.211 221.153.0.212 221.153.0.213 221.153.0.214 221.153.0.215 221.153.0.216 221.153.0.217 221.153.0.218 221.153.0.219 221.153.0.220 221.153.0.221 221.153.0.222 221.153.0.223 221.153.0.224 221.153.0.225 221.153.0.226 221.153.0.227 221.153.0.228 221.153.0.229 221.153.0.230 221.153.0.231 221.153.0.232 221.153.0.233 221.153.0.234 221.153.0.235 221.153.0.236 221.153.0.237 221.153.0.238 221.153.0.239 221.153.0.240 221.153.0.241 221.153.0.242 221.153.0.243 221.153.0.244 221.153.0.245 221.153.0.246 221.153.0.247 221.153.0.248 221.153.0.249 221.153.0.250 221.153.0.251 221.153.0.252 221.153.0.253 221.153.0.254 221.153.0.255 + 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 221.144.0.0/12.

Announced prefix
221.144.0.0/12
Origin AS
AS4766
Announcement samples
20,348
Last seen
2026-10-13 23:11:55

Frequently Asked Questions

What is 221.153.0.0/16?

221.153.0.0/16 is a CIDR network block containing 65,536 IPv4 addresses (from 221.153.0.0 to 221.153.255.255). CIDR notation combines an IP address with a prefix length to define a range of addresses.

Who owns the 221.153.0.0/16 network?

The 221.153.0.0/16 range is allocated to Korea Telecom and announced via AS4766 from South Korea.

Last updated: 2026-10-13 23:54:04 UTC
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