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CIDR Range

161.31.64.0/20

4.1K IPs /20 Arkansas Research and Education Optical Network AS40581 United States ARIN
Addresses
4,096
4.1K
IP Range
161.31.64.0
→ 161.31.79.255
Sub-ranges
2+
within this block
PTR Density
0.0%
0 of 4.1K 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 →

Ranges inside 161.31.64.0/20

CIDRIPsOrganizationASNCountry
161.31.64.0/21 2.0K Arkansas Research and Education Optical Network AS40581 US
161.31.72.0/21 2.0K Arkansas Research and Education Optical Network AS40581 US

Geolocation

First 256 of 4,096 IP addresses in 161.31.64.0/20

161.31.64.0 161.31.64.1 161.31.64.2 161.31.64.3 161.31.64.4 161.31.64.5 161.31.64.6 161.31.64.7 161.31.64.8 161.31.64.9 161.31.64.10 161.31.64.11 161.31.64.12 161.31.64.13 161.31.64.14 161.31.64.15 161.31.64.16 161.31.64.17 161.31.64.18 161.31.64.19 161.31.64.20 161.31.64.21 161.31.64.22 161.31.64.23 161.31.64.24 161.31.64.25 161.31.64.26 161.31.64.27 161.31.64.28 161.31.64.29 161.31.64.30 161.31.64.31 161.31.64.32 161.31.64.33 161.31.64.34 161.31.64.35 161.31.64.36 161.31.64.37 161.31.64.38 161.31.64.39 161.31.64.40 161.31.64.41 161.31.64.42 161.31.64.43 161.31.64.44 161.31.64.45 161.31.64.46 161.31.64.47 161.31.64.48 161.31.64.49 161.31.64.50 161.31.64.51 161.31.64.52 161.31.64.53 161.31.64.54 161.31.64.55 161.31.64.56 161.31.64.57 161.31.64.58 161.31.64.59 161.31.64.60 161.31.64.61 161.31.64.62 161.31.64.63 161.31.64.64 161.31.64.65 161.31.64.66 161.31.64.67 161.31.64.68 161.31.64.69 161.31.64.70 161.31.64.71 161.31.64.72 161.31.64.73 161.31.64.74 161.31.64.75 161.31.64.76 161.31.64.77 161.31.64.78 161.31.64.79 161.31.64.80 161.31.64.81 161.31.64.82 161.31.64.83 161.31.64.84 161.31.64.85 161.31.64.86 161.31.64.87 161.31.64.88 161.31.64.89 161.31.64.90 161.31.64.91 161.31.64.92 161.31.64.93 161.31.64.94 161.31.64.95 161.31.64.96 161.31.64.97 161.31.64.98 161.31.64.99 161.31.64.100 161.31.64.101 161.31.64.102 161.31.64.103 161.31.64.104 161.31.64.105 161.31.64.106 161.31.64.107 161.31.64.108 161.31.64.109 161.31.64.110 161.31.64.111 161.31.64.112 161.31.64.113 161.31.64.114 161.31.64.115 161.31.64.116 161.31.64.117 161.31.64.118 161.31.64.119 161.31.64.120 161.31.64.121 161.31.64.122 161.31.64.123 161.31.64.124 161.31.64.125 161.31.64.126 161.31.64.127 161.31.64.128 161.31.64.129 161.31.64.130 161.31.64.131 161.31.64.132 161.31.64.133 161.31.64.134 161.31.64.135 161.31.64.136 161.31.64.137 161.31.64.138 161.31.64.139 161.31.64.140 161.31.64.141 161.31.64.142 161.31.64.143 161.31.64.144 161.31.64.145 161.31.64.146 161.31.64.147 161.31.64.148 161.31.64.149 161.31.64.150 161.31.64.151 161.31.64.152 161.31.64.153 161.31.64.154 161.31.64.155 161.31.64.156 161.31.64.157 161.31.64.158 161.31.64.159 161.31.64.160 161.31.64.161 161.31.64.162 161.31.64.163 161.31.64.164 161.31.64.165 161.31.64.166 161.31.64.167 161.31.64.168 161.31.64.169 161.31.64.170 161.31.64.171 161.31.64.172 161.31.64.173 161.31.64.174 161.31.64.175 161.31.64.176 161.31.64.177 161.31.64.178 161.31.64.179 161.31.64.180 161.31.64.181 161.31.64.182 161.31.64.183 161.31.64.184 161.31.64.185 161.31.64.186 161.31.64.187 161.31.64.188 161.31.64.189 161.31.64.190 161.31.64.191 161.31.64.192 161.31.64.193 161.31.64.194 161.31.64.195 161.31.64.196 161.31.64.197 161.31.64.198 161.31.64.199 161.31.64.200 161.31.64.201 161.31.64.202 161.31.64.203 161.31.64.204 161.31.64.205 161.31.64.206 161.31.64.207 161.31.64.208 161.31.64.209 161.31.64.210 161.31.64.211 161.31.64.212 161.31.64.213 161.31.64.214 161.31.64.215 161.31.64.216 161.31.64.217 161.31.64.218 161.31.64.219 161.31.64.220 161.31.64.221 161.31.64.222 161.31.64.223 161.31.64.224 161.31.64.225 161.31.64.226 161.31.64.227 161.31.64.228 161.31.64.229 161.31.64.230 161.31.64.231 161.31.64.232 161.31.64.233 161.31.64.234 161.31.64.235 161.31.64.236 161.31.64.237 161.31.64.238 161.31.64.239 161.31.64.240 161.31.64.241 161.31.64.242 161.31.64.243 161.31.64.244 161.31.64.245 161.31.64.246 161.31.64.247 161.31.64.248 161.31.64.249 161.31.64.250 161.31.64.251 161.31.64.252 161.31.64.253 161.31.64.254 161.31.64.255 + 3.8K more (range too large to list inline)

BGP Routing

Live BGP anomalies →

Not announced as an exact prefix — covered by the announced supernet 161.31.0.0/16.

Announced prefix
161.31.0.0/16
Origin AS
AS40581
Announcement samples
7,165
Last seen
2026-07-23 06:42:16

Frequently Asked Questions

What is 161.31.64.0/20?

161.31.64.0/20 is a CIDR network block containing 4,096 IPv4 addresses (from 161.31.64.0 to 161.31.79.255). CIDR notation combines an IP address with a prefix length to define a range of addresses.

Who owns the 161.31.64.0/20 network?

The 161.31.64.0/20 range is allocated to Arkansas Research and Education Optical Network and announced via AS40581 from United States.

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