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CIDR Range

131.221.236.0/23

512 IPs /23 OuriNet TELECOM AS264439 Brazil ARIN
Addresses
512
512
IP Range
131.221.236.0
→ 131.221.237.255
Sub-ranges
7+
within this block
PTR Density
99.8%
511 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.

78/100
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 131.221.236.0/23

CIDRIPsOrganizationASNCountry
131.221.237.0/24 256 OuriNet TELECOM AS264439 BR
131.221.236.0/25 128 OuriNet TELECOM AS264439 BR
131.221.236.192/26 64 OuriNet TELECOM AS264439 BR
131.221.236.128/27 32 OuriNet TELECOM AS264439 BR
131.221.236.176/28 16 OuriNet TELECOM AS264439 BR
131.221.236.160/29 8 OuriNet TELECOM AS264439 BR
131.221.236.168/29 8 OuriNet TELECOM AS264439 BR

First 256 of 512 IP addresses in 131.221.236.0/23

131.221.236.0 131.221.236.1 131.221.236.2 131.221.236.3 131.221.236.4 131.221.236.5 131.221.236.6 131.221.236.7 131.221.236.8 131.221.236.9 131.221.236.10 131.221.236.11 131.221.236.12 131.221.236.13 131.221.236.14 131.221.236.15 131.221.236.16 131.221.236.17 131.221.236.18 131.221.236.19 131.221.236.20 131.221.236.21 131.221.236.22 131.221.236.23 131.221.236.24 131.221.236.25 131.221.236.26 131.221.236.27 131.221.236.28 131.221.236.29 131.221.236.30 131.221.236.31 131.221.236.32 131.221.236.33 131.221.236.34 131.221.236.35 131.221.236.36 131.221.236.37 131.221.236.38 131.221.236.39 131.221.236.40 131.221.236.41 131.221.236.42 131.221.236.43 131.221.236.44 131.221.236.45 131.221.236.46 131.221.236.47 131.221.236.48 131.221.236.49 131.221.236.50 131.221.236.51 131.221.236.52 131.221.236.53 131.221.236.54 131.221.236.55 131.221.236.56 131.221.236.57 131.221.236.58 131.221.236.59 131.221.236.60 131.221.236.61 131.221.236.62 131.221.236.63 131.221.236.64 131.221.236.65 131.221.236.66 131.221.236.67 131.221.236.68 131.221.236.69 131.221.236.70 131.221.236.71 131.221.236.72 131.221.236.73 131.221.236.74 131.221.236.75 131.221.236.76 131.221.236.77 131.221.236.78 131.221.236.79 131.221.236.80 131.221.236.81 131.221.236.82 131.221.236.83 131.221.236.84 131.221.236.85 131.221.236.86 131.221.236.87 131.221.236.88 131.221.236.89 131.221.236.90 131.221.236.91 131.221.236.92 131.221.236.93 131.221.236.94 131.221.236.95 131.221.236.96 131.221.236.97 131.221.236.98 131.221.236.99 131.221.236.100 131.221.236.101 131.221.236.102 131.221.236.103 131.221.236.104 131.221.236.105 131.221.236.106 131.221.236.107 131.221.236.108 131.221.236.109 131.221.236.110 131.221.236.111 131.221.236.112 131.221.236.113 131.221.236.114 131.221.236.115 131.221.236.116 131.221.236.117 131.221.236.118 131.221.236.119 131.221.236.120 131.221.236.121 131.221.236.122 131.221.236.123 131.221.236.124 131.221.236.125 131.221.236.126 131.221.236.127 131.221.236.128 131.221.236.129 131.221.236.130 131.221.236.131 131.221.236.132 131.221.236.133 131.221.236.134 131.221.236.135 131.221.236.136 131.221.236.137 131.221.236.138 131.221.236.139 131.221.236.140 131.221.236.141 131.221.236.142 131.221.236.143 131.221.236.144 131.221.236.145 131.221.236.146 131.221.236.147 131.221.236.148 131.221.236.149 131.221.236.150 131.221.236.151 131.221.236.152 131.221.236.153 131.221.236.154 131.221.236.155 131.221.236.156 131.221.236.157 131.221.236.158 131.221.236.159 131.221.236.160 131.221.236.161 131.221.236.162 131.221.236.163 131.221.236.164 131.221.236.165 131.221.236.166 131.221.236.167 131.221.236.168 131.221.236.169 131.221.236.170 131.221.236.171 131.221.236.172 131.221.236.173 131.221.236.174 131.221.236.175 131.221.236.176 131.221.236.177 131.221.236.178 131.221.236.179 131.221.236.180 131.221.236.181 131.221.236.182 131.221.236.183 131.221.236.184 131.221.236.185 131.221.236.186 131.221.236.187 131.221.236.188 131.221.236.189 131.221.236.190 131.221.236.191 131.221.236.192 131.221.236.193 131.221.236.194 131.221.236.195 131.221.236.196 131.221.236.197 131.221.236.198 131.221.236.199 131.221.236.200 131.221.236.201 131.221.236.202 131.221.236.203 131.221.236.204 131.221.236.205 131.221.236.206 131.221.236.207 131.221.236.208 131.221.236.209 131.221.236.210 131.221.236.211 131.221.236.212 131.221.236.213 131.221.236.214 131.221.236.215 131.221.236.216 131.221.236.217 131.221.236.218 131.221.236.219 131.221.236.220 131.221.236.221 131.221.236.222 131.221.236.223 131.221.236.224 131.221.236.225 131.221.236.226 131.221.236.227 131.221.236.228 131.221.236.229 131.221.236.230 131.221.236.231 131.221.236.232 131.221.236.233 131.221.236.234 131.221.236.235 131.221.236.236 131.221.236.237 131.221.236.238 131.221.236.239 131.221.236.240 131.221.236.241 131.221.236.242 131.221.236.243 131.221.236.244 131.221.236.245 131.221.236.246 131.221.236.247 131.221.236.248 131.221.236.249 131.221.236.250 131.221.236.251 131.221.236.252 131.221.236.253 131.221.236.254 131.221.236.255 + 256 more (range too large to list inline)

BGP Routing

Live BGP anomalies →

Not announced as an exact prefix — covered by the announced supernet 131.221.236.0/22.

Announced prefix
131.221.236.0/22
Origin AS
AS264439
Announcement samples
45,988
Last seen
2026-07-23 02:57:39

RIR Ownership History

Atom feed ⇲

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

Date Event From To
2026-05-10 RIR Transfer arin lacnic

Frequently Asked Questions

What is 131.221.236.0/23?

131.221.236.0/23 is a CIDR network block containing 512 IPv4 addresses (from 131.221.236.0 to 131.221.237.255). CIDR notation combines an IP address with a prefix length to define a range of addresses.

Who owns the 131.221.236.0/23 network?

The 131.221.236.0/23 range is allocated to OuriNet TELECOM and announced via AS264439 from Brazil.

Last updated: 2026-07-23 02:55:32 UTC
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