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CIDR Range

18.18.4.0/23

512 IPs /23 Massachusetts Institute of Technology AS3 United States ARIN
Addresses
512
512
IP Range
18.18.4.0
→ 18.18.5.255
Sub-ranges
0+
within this block
PTR Density
0.0%
0 of 512 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.

71/100
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 512 IP addresses in 18.18.4.0/23

18.18.4.0 18.18.4.1 18.18.4.2 18.18.4.3 18.18.4.4 18.18.4.5 18.18.4.6 18.18.4.7 18.18.4.8 18.18.4.9 18.18.4.10 18.18.4.11 18.18.4.12 18.18.4.13 18.18.4.14 18.18.4.15 18.18.4.16 18.18.4.17 18.18.4.18 18.18.4.19 18.18.4.20 18.18.4.21 18.18.4.22 18.18.4.23 18.18.4.24 18.18.4.25 18.18.4.26 18.18.4.27 18.18.4.28 18.18.4.29 18.18.4.30 18.18.4.31 18.18.4.32 18.18.4.33 18.18.4.34 18.18.4.35 18.18.4.36 18.18.4.37 18.18.4.38 18.18.4.39 18.18.4.40 18.18.4.41 18.18.4.42 18.18.4.43 18.18.4.44 18.18.4.45 18.18.4.46 18.18.4.47 18.18.4.48 18.18.4.49 18.18.4.50 18.18.4.51 18.18.4.52 18.18.4.53 18.18.4.54 18.18.4.55 18.18.4.56 18.18.4.57 18.18.4.58 18.18.4.59 18.18.4.60 18.18.4.61 18.18.4.62 18.18.4.63 18.18.4.64 18.18.4.65 18.18.4.66 18.18.4.67 18.18.4.68 18.18.4.69 18.18.4.70 18.18.4.71 18.18.4.72 18.18.4.73 18.18.4.74 18.18.4.75 18.18.4.76 18.18.4.77 18.18.4.78 18.18.4.79 18.18.4.80 18.18.4.81 18.18.4.82 18.18.4.83 18.18.4.84 18.18.4.85 18.18.4.86 18.18.4.87 18.18.4.88 18.18.4.89 18.18.4.90 18.18.4.91 18.18.4.92 18.18.4.93 18.18.4.94 18.18.4.95 18.18.4.96 18.18.4.97 18.18.4.98 18.18.4.99 18.18.4.100 18.18.4.101 18.18.4.102 18.18.4.103 18.18.4.104 18.18.4.105 18.18.4.106 18.18.4.107 18.18.4.108 18.18.4.109 18.18.4.110 18.18.4.111 18.18.4.112 18.18.4.113 18.18.4.114 18.18.4.115 18.18.4.116 18.18.4.117 18.18.4.118 18.18.4.119 18.18.4.120 18.18.4.121 18.18.4.122 18.18.4.123 18.18.4.124 18.18.4.125 18.18.4.126 18.18.4.127 18.18.4.128 18.18.4.129 18.18.4.130 18.18.4.131 18.18.4.132 18.18.4.133 18.18.4.134 18.18.4.135 18.18.4.136 18.18.4.137 18.18.4.138 18.18.4.139 18.18.4.140 18.18.4.141 18.18.4.142 18.18.4.143 18.18.4.144 18.18.4.145 18.18.4.146 18.18.4.147 18.18.4.148 18.18.4.149 18.18.4.150 18.18.4.151 18.18.4.152 18.18.4.153 18.18.4.154 18.18.4.155 18.18.4.156 18.18.4.157 18.18.4.158 18.18.4.159 18.18.4.160 18.18.4.161 18.18.4.162 18.18.4.163 18.18.4.164 18.18.4.165 18.18.4.166 18.18.4.167 18.18.4.168 18.18.4.169 18.18.4.170 18.18.4.171 18.18.4.172 18.18.4.173 18.18.4.174 18.18.4.175 18.18.4.176 18.18.4.177 18.18.4.178 18.18.4.179 18.18.4.180 18.18.4.181 18.18.4.182 18.18.4.183 18.18.4.184 18.18.4.185 18.18.4.186 18.18.4.187 18.18.4.188 18.18.4.189 18.18.4.190 18.18.4.191 18.18.4.192 18.18.4.193 18.18.4.194 18.18.4.195 18.18.4.196 18.18.4.197 18.18.4.198 18.18.4.199 18.18.4.200 18.18.4.201 18.18.4.202 18.18.4.203 18.18.4.204 18.18.4.205 18.18.4.206 18.18.4.207 18.18.4.208 18.18.4.209 18.18.4.210 18.18.4.211 18.18.4.212 18.18.4.213 18.18.4.214 18.18.4.215 18.18.4.216 18.18.4.217 18.18.4.218 18.18.4.219 18.18.4.220 18.18.4.221 18.18.4.222 18.18.4.223 18.18.4.224 18.18.4.225 18.18.4.226 18.18.4.227 18.18.4.228 18.18.4.229 18.18.4.230 18.18.4.231 18.18.4.232 18.18.4.233 18.18.4.234 18.18.4.235 18.18.4.236 18.18.4.237 18.18.4.238 18.18.4.239 18.18.4.240 18.18.4.241 18.18.4.242 18.18.4.243 18.18.4.244 18.18.4.245 18.18.4.246 18.18.4.247 18.18.4.248 18.18.4.249 18.18.4.250 18.18.4.251 18.18.4.252 18.18.4.253 18.18.4.254 18.18.4.255 + 256 more (range too large to list inline)

BGP Routing

Live BGP anomalies →

Not announced as an exact prefix — covered by the announced supernet 18.18.0.0/16.

Announced prefix
18.18.0.0/16
Origin AS
AS3
Announcement samples
3,845
Last seen
2026-07-20 05:36:10

Frequently Asked Questions

What is 18.18.4.0/23?

18.18.4.0/23 is a CIDR network block containing 512 IPv4 addresses (from 18.18.4.0 to 18.18.5.255). CIDR notation combines an IP address with a prefix length to define a range of addresses.

Who owns the 18.18.4.0/23 network?

The 18.18.4.0/23 range is allocated to Massachusetts Institute of Technology and announced via AS3 from United States.

Last updated: 2026-07-20 07:10:35 UTC
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