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CIDR Range

210.138.216.0/21

2.0K IPs /21 Internet Initiative Japan Inc. AS2497 Japan APNIC
Addresses
2,048
2.0K
IP Range
210.138.216.0
→ 210.138.223.255
Sub-ranges
0+
within this block
PTR Density
50.5%
1.0K of 2.0K 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.

76/100
Moderate
How this score is built

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

Geolocation

First 256 of 2,048 IP addresses in 210.138.216.0/21

210.138.216.0 210.138.216.1 210.138.216.2 210.138.216.3 210.138.216.4 210.138.216.5 210.138.216.6 210.138.216.7 210.138.216.8 210.138.216.9 210.138.216.10 210.138.216.11 210.138.216.12 210.138.216.13 210.138.216.14 210.138.216.15 210.138.216.16 210.138.216.17 210.138.216.18 210.138.216.19 210.138.216.20 210.138.216.21 210.138.216.22 210.138.216.23 210.138.216.24 210.138.216.25 210.138.216.26 210.138.216.27 210.138.216.28 210.138.216.29 210.138.216.30 210.138.216.31 210.138.216.32 210.138.216.33 210.138.216.34 210.138.216.35 210.138.216.36 210.138.216.37 210.138.216.38 210.138.216.39 210.138.216.40 210.138.216.41 210.138.216.42 210.138.216.43 210.138.216.44 210.138.216.45 210.138.216.46 210.138.216.47 210.138.216.48 210.138.216.49 210.138.216.50 210.138.216.51 210.138.216.52 210.138.216.53 210.138.216.54 210.138.216.55 210.138.216.56 210.138.216.57 210.138.216.58 210.138.216.59 210.138.216.60 210.138.216.61 210.138.216.62 210.138.216.63 210.138.216.64 210.138.216.65 210.138.216.66 210.138.216.67 210.138.216.68 210.138.216.69 210.138.216.70 210.138.216.71 210.138.216.72 210.138.216.73 210.138.216.74 210.138.216.75 210.138.216.76 210.138.216.77 210.138.216.78 210.138.216.79 210.138.216.80 210.138.216.81 210.138.216.82 210.138.216.83 210.138.216.84 210.138.216.85 210.138.216.86 210.138.216.87 210.138.216.88 210.138.216.89 210.138.216.90 210.138.216.91 210.138.216.92 210.138.216.93 210.138.216.94 210.138.216.95 210.138.216.96 210.138.216.97 210.138.216.98 210.138.216.99 210.138.216.100 210.138.216.101 210.138.216.102 210.138.216.103 210.138.216.104 210.138.216.105 210.138.216.106 210.138.216.107 210.138.216.108 210.138.216.109 210.138.216.110 210.138.216.111 210.138.216.112 210.138.216.113 210.138.216.114 210.138.216.115 210.138.216.116 210.138.216.117 210.138.216.118 210.138.216.119 210.138.216.120 210.138.216.121 210.138.216.122 210.138.216.123 210.138.216.124 210.138.216.125 210.138.216.126 210.138.216.127 210.138.216.128 210.138.216.129 210.138.216.130 210.138.216.131 210.138.216.132 210.138.216.133 210.138.216.134 210.138.216.135 210.138.216.136 210.138.216.137 210.138.216.138 210.138.216.139 210.138.216.140 210.138.216.141 210.138.216.142 210.138.216.143 210.138.216.144 210.138.216.145 210.138.216.146 210.138.216.147 210.138.216.148 210.138.216.149 210.138.216.150 210.138.216.151 210.138.216.152 210.138.216.153 210.138.216.154 210.138.216.155 210.138.216.156 210.138.216.157 210.138.216.158 210.138.216.159 210.138.216.160 210.138.216.161 210.138.216.162 210.138.216.163 210.138.216.164 210.138.216.165 210.138.216.166 210.138.216.167 210.138.216.168 210.138.216.169 210.138.216.170 210.138.216.171 210.138.216.172 210.138.216.173 210.138.216.174 210.138.216.175 210.138.216.176 210.138.216.177 210.138.216.178 210.138.216.179 210.138.216.180 210.138.216.181 210.138.216.182 210.138.216.183 210.138.216.184 210.138.216.185 210.138.216.186 210.138.216.187 210.138.216.188 210.138.216.189 210.138.216.190 210.138.216.191 210.138.216.192 210.138.216.193 210.138.216.194 210.138.216.195 210.138.216.196 210.138.216.197 210.138.216.198 210.138.216.199 210.138.216.200 210.138.216.201 210.138.216.202 210.138.216.203 210.138.216.204 210.138.216.205 210.138.216.206 210.138.216.207 210.138.216.208 210.138.216.209 210.138.216.210 210.138.216.211 210.138.216.212 210.138.216.213 210.138.216.214 210.138.216.215 210.138.216.216 210.138.216.217 210.138.216.218 210.138.216.219 210.138.216.220 210.138.216.221 210.138.216.222 210.138.216.223 210.138.216.224 210.138.216.225 210.138.216.226 210.138.216.227 210.138.216.228 210.138.216.229 210.138.216.230 210.138.216.231 210.138.216.232 210.138.216.233 210.138.216.234 210.138.216.235 210.138.216.236 210.138.216.237 210.138.216.238 210.138.216.239 210.138.216.240 210.138.216.241 210.138.216.242 210.138.216.243 210.138.216.244 210.138.216.245 210.138.216.246 210.138.216.247 210.138.216.248 210.138.216.249 210.138.216.250 210.138.216.251 210.138.216.252 210.138.216.253 210.138.216.254 210.138.216.255 + 1.8K more (range too large to list inline)

BGP Routing

Live BGP anomalies →

Not announced as an exact prefix — covered by the announced supernet 210.138.0.0/16.

Announced prefix
210.138.0.0/16
Origin AS
AS2497
Announcement samples
3,920
Last seen
2026-07-23 14:36:45

Frequently Asked Questions

What is 210.138.216.0/21?

210.138.216.0/21 is a CIDR network block containing 2,048 IPv4 addresses (from 210.138.216.0 to 210.138.223.255). CIDR notation combines an IP address with a prefix length to define a range of addresses.

Who owns the 210.138.216.0/21 network?

The 210.138.216.0/21 range is allocated to Internet Initiative Japan Inc. and announced via AS2497 from Japan.

Last updated: 2026-07-23 15:25:31 UTC
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