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CIDR Range

191.53.16.0/21

2.0K IPs /21 MASTER S/A AS28202 Brazil LACNIC
Addresses
2,048
2.0K
IP Range
191.53.16.0
→ 191.53.23.255
Sub-ranges
4+
within this block
PTR Density
99.6%
2.0K 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.

77/100
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 191.53.16.0/21

CIDRIPsOrganizationASNCountry
191.53.20.0/22 1.0K MASTER S/A AS28202 BR
191.53.16.0/23 512 MASTER S/A AS28202 BR
191.53.18.0/24 256 MASTER S/A AS28202 BR
191.53.19.0/24 256 MASTER S/A AS28202 BR

First 256 of 2,048 IP addresses in 191.53.16.0/21

191.53.16.0 191.53.16.1 191.53.16.2 191.53.16.3 191.53.16.4 191.53.16.5 191.53.16.6 191.53.16.7 191.53.16.8 191.53.16.9 191.53.16.10 191.53.16.11 191.53.16.12 191.53.16.13 191.53.16.14 191.53.16.15 191.53.16.16 191.53.16.17 191.53.16.18 191.53.16.19 191.53.16.20 191.53.16.21 191.53.16.22 191.53.16.23 191.53.16.24 191.53.16.25 191.53.16.26 191.53.16.27 191.53.16.28 191.53.16.29 191.53.16.30 191.53.16.31 191.53.16.32 191.53.16.33 191.53.16.34 191.53.16.35 191.53.16.36 191.53.16.37 191.53.16.38 191.53.16.39 191.53.16.40 191.53.16.41 191.53.16.42 191.53.16.43 191.53.16.44 191.53.16.45 191.53.16.46 191.53.16.47 191.53.16.48 191.53.16.49 191.53.16.50 191.53.16.51 191.53.16.52 191.53.16.53 191.53.16.54 191.53.16.55 191.53.16.56 191.53.16.57 191.53.16.58 191.53.16.59 191.53.16.60 191.53.16.61 191.53.16.62 191.53.16.63 191.53.16.64 191.53.16.65 191.53.16.66 191.53.16.67 191.53.16.68 191.53.16.69 191.53.16.70 191.53.16.71 191.53.16.72 191.53.16.73 191.53.16.74 191.53.16.75 191.53.16.76 191.53.16.77 191.53.16.78 191.53.16.79 191.53.16.80 191.53.16.81 191.53.16.82 191.53.16.83 191.53.16.84 191.53.16.85 191.53.16.86 191.53.16.87 191.53.16.88 191.53.16.89 191.53.16.90 191.53.16.91 191.53.16.92 191.53.16.93 191.53.16.94 191.53.16.95 191.53.16.96 191.53.16.97 191.53.16.98 191.53.16.99 191.53.16.100 191.53.16.101 191.53.16.102 191.53.16.103 191.53.16.104 191.53.16.105 191.53.16.106 191.53.16.107 191.53.16.108 191.53.16.109 191.53.16.110 191.53.16.111 191.53.16.112 191.53.16.113 191.53.16.114 191.53.16.115 191.53.16.116 191.53.16.117 191.53.16.118 191.53.16.119 191.53.16.120 191.53.16.121 191.53.16.122 191.53.16.123 191.53.16.124 191.53.16.125 191.53.16.126 191.53.16.127 191.53.16.128 191.53.16.129 191.53.16.130 191.53.16.131 191.53.16.132 191.53.16.133 191.53.16.134 191.53.16.135 191.53.16.136 191.53.16.137 191.53.16.138 191.53.16.139 191.53.16.140 191.53.16.141 191.53.16.142 191.53.16.143 191.53.16.144 191.53.16.145 191.53.16.146 191.53.16.147 191.53.16.148 191.53.16.149 191.53.16.150 191.53.16.151 191.53.16.152 191.53.16.153 191.53.16.154 191.53.16.155 191.53.16.156 191.53.16.157 191.53.16.158 191.53.16.159 191.53.16.160 191.53.16.161 191.53.16.162 191.53.16.163 191.53.16.164 191.53.16.165 191.53.16.166 191.53.16.167 191.53.16.168 191.53.16.169 191.53.16.170 191.53.16.171 191.53.16.172 191.53.16.173 191.53.16.174 191.53.16.175 191.53.16.176 191.53.16.177 191.53.16.178 191.53.16.179 191.53.16.180 191.53.16.181 191.53.16.182 191.53.16.183 191.53.16.184 191.53.16.185 191.53.16.186 191.53.16.187 191.53.16.188 191.53.16.189 191.53.16.190 191.53.16.191 191.53.16.192 191.53.16.193 191.53.16.194 191.53.16.195 191.53.16.196 191.53.16.197 191.53.16.198 191.53.16.199 191.53.16.200 191.53.16.201 191.53.16.202 191.53.16.203 191.53.16.204 191.53.16.205 191.53.16.206 191.53.16.207 191.53.16.208 191.53.16.209 191.53.16.210 191.53.16.211 191.53.16.212 191.53.16.213 191.53.16.214 191.53.16.215 191.53.16.216 191.53.16.217 191.53.16.218 191.53.16.219 191.53.16.220 191.53.16.221 191.53.16.222 191.53.16.223 191.53.16.224 191.53.16.225 191.53.16.226 191.53.16.227 191.53.16.228 191.53.16.229 191.53.16.230 191.53.16.231 191.53.16.232 191.53.16.233 191.53.16.234 191.53.16.235 191.53.16.236 191.53.16.237 191.53.16.238 191.53.16.239 191.53.16.240 191.53.16.241 191.53.16.242 191.53.16.243 191.53.16.244 191.53.16.245 191.53.16.246 191.53.16.247 191.53.16.248 191.53.16.249 191.53.16.250 191.53.16.251 191.53.16.252 191.53.16.253 191.53.16.254 191.53.16.255 + 1.8K more (range too large to list inline)

BGP Routing

Live BGP anomalies →

This block is announced in BGP, observed across our RIPE RIS collectors.

Announced prefix
191.53.16.0/21
Origin AS
AS28202
Announcement samples
32,948
Last seen
2026-07-23 09:34:09

Frequently Asked Questions

What is 191.53.16.0/21?

191.53.16.0/21 is a CIDR network block containing 2,048 IPv4 addresses (from 191.53.16.0 to 191.53.23.255). CIDR notation combines an IP address with a prefix length to define a range of addresses.

Who owns the 191.53.16.0/21 network?

The 191.53.16.0/21 range is allocated to MASTER S/A and announced via AS28202 from Brazil.

Last updated: 2026-07-23 09:40:31 UTC
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