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CIDR Range

51.81.0.0/17

32.8K IPs /17 OVH SAS AS16276 United States RIPE
Addresses
32,768
32.8K
IP Range
51.81.0.0
→ 51.81.127.255
Sub-ranges
50+
within this block
PTR Density
70.1%
23.0K of 32.8K 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.

70/100
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 51.81.0.0/17

CIDRIPsOrganizationASNCountry
51.81.120.0/21 2.0K OVH SAS AS16276 US
51.81.88.0/22 1.0K OVH SAS AS16276 US
51.81.52.0/22 1.0K OVH SAS AS16276 US
51.81.16.0/22 1.0K OVH SAS AS16276 US
51.81.12.0/22 1.0K OVH SAS AS16276 US
51.81.60.0/22 1.0K OVH SAS AS16276 US
51.81.68.0/22 1.0K OVH SAS AS16276 US
51.81.4.0/22 1.0K OVH SAS AS16276 US
51.81.72.0/22 1.0K OVH SAS AS16276 US
51.81.36.0/22 1.0K OVH SAS AS16276 US
51.81.80.0/22 1.0K OVH SAS AS16276 US
51.81.112.0/22 1.0K OVH SAS AS16276 US
51.81.104.0/23 512 OVH SAS AS16276 US
51.81.98.0/23 512 OVH SAS AS16276 US
51.81.100.0/23 512 OVH SAS AS16276 US
51.81.32.0/23 512 OVH SAS AS16276 US
51.81.94.0/23 512 OVH SAS AS16276 US
51.81.26.0/23 512 OVH SAS AS16276 US
51.81.64.0/23 512 OVH SAS AS16276 US
51.81.22.0/23 512 OVH SAS AS16276 US
51.81.40.0/23 512 OVH SAS AS16276 US
51.81.118.0/23 512 OVH SAS AS16276 US
51.81.48.0/23 512 OVH SAS AS16276 US
51.81.110.0/23 512 OVH SAS AS16276 US
51.81.2.0/23 512 OVH SAS AS16276 US
51.81.44.0/23 512 OVH SAS AS16276 US
51.81.86.0/23 512 OVH SAS AS16276 US
51.81.8.0/23 512 OVH SAS AS16276 US
51.81.76.0/24 256 OVH SAS AS16276 US
51.81.85.0/24 256 OVH SAS AS16276 US
51.81.42.0/24 256 OVH SAS AS16276 US
51.81.50.0/24 256 OVH SAS AS16276 US
51.81.67.0/24 256 OVH SAS AS16276 US
51.81.47.0/24 256 OVH SAS AS16276 US
51.81.78.0/24 256 OVH SAS AS16276 US
51.81.31.0/24 256 OVH SAS AS16276 US
51.81.59.0/24 256 OVH SAS AS16276 US
51.81.34.0/24 256 OVH SAS AS16276 US
51.81.57.0/24 256 OVH SAS AS16276 US
51.81.46.0/24 256 OVH SAS AS16276 US
51.81.92.0/24 256 OVH SAS AS16276 US
51.81.107.0/24 256 OVH SAS AS16276 US
51.81.97.0/24 256 OVH SAS AS16276 US
51.81.10.0/24 256 OVH SAS AS16276 US
51.81.24.0/24 256 OVH SAS AS16276 US
51.81.11.0/24 256 OVH SAS AS16276 US
51.81.20.0/24 256 OVH SAS AS16276 US
51.81.103.0/24 256 OVH SAS AS16276 US
51.81.108.0/24 256 OVH SAS AS16276 US
51.81.1.0/24 256 OVH SAS AS16276 US

First 256 of 32,768 IP addresses in 51.81.0.0/17

51.81.0.0 51.81.0.1 51.81.0.2 51.81.0.3 51.81.0.4 51.81.0.5 51.81.0.6 51.81.0.7 51.81.0.8 51.81.0.9 51.81.0.10 51.81.0.11 51.81.0.12 51.81.0.13 51.81.0.14 51.81.0.15 51.81.0.16 51.81.0.17 51.81.0.18 51.81.0.19 51.81.0.20 51.81.0.21 51.81.0.22 51.81.0.23 51.81.0.24 51.81.0.25 51.81.0.26 51.81.0.27 51.81.0.28 51.81.0.29 51.81.0.30 51.81.0.31 51.81.0.32 51.81.0.33 51.81.0.34 51.81.0.35 51.81.0.36 51.81.0.37 51.81.0.38 51.81.0.39 51.81.0.40 51.81.0.41 51.81.0.42 51.81.0.43 51.81.0.44 51.81.0.45 51.81.0.46 51.81.0.47 51.81.0.48 51.81.0.49 51.81.0.50 51.81.0.51 51.81.0.52 51.81.0.53 51.81.0.54 51.81.0.55 51.81.0.56 51.81.0.57 51.81.0.58 51.81.0.59 51.81.0.60 51.81.0.61 51.81.0.62 51.81.0.63 51.81.0.64 51.81.0.65 51.81.0.66 51.81.0.67 51.81.0.68 51.81.0.69 51.81.0.70 51.81.0.71 51.81.0.72 51.81.0.73 51.81.0.74 51.81.0.75 51.81.0.76 51.81.0.77 51.81.0.78 51.81.0.79 51.81.0.80 51.81.0.81 51.81.0.82 51.81.0.83 51.81.0.84 51.81.0.85 51.81.0.86 51.81.0.87 51.81.0.88 51.81.0.89 51.81.0.90 51.81.0.91 51.81.0.92 51.81.0.93 51.81.0.94 51.81.0.95 51.81.0.96 51.81.0.97 51.81.0.98 51.81.0.99 51.81.0.100 51.81.0.101 51.81.0.102 51.81.0.103 51.81.0.104 51.81.0.105 51.81.0.106 51.81.0.107 51.81.0.108 51.81.0.109 51.81.0.110 51.81.0.111 51.81.0.112 51.81.0.113 51.81.0.114 51.81.0.115 51.81.0.116 51.81.0.117 51.81.0.118 51.81.0.119 51.81.0.120 51.81.0.121 51.81.0.122 51.81.0.123 51.81.0.124 51.81.0.125 51.81.0.126 51.81.0.127 51.81.0.128 51.81.0.129 51.81.0.130 51.81.0.131 51.81.0.132 51.81.0.133 51.81.0.134 51.81.0.135 51.81.0.136 51.81.0.137 51.81.0.138 51.81.0.139 51.81.0.140 51.81.0.141 51.81.0.142 51.81.0.143 51.81.0.144 51.81.0.145 51.81.0.146 51.81.0.147 51.81.0.148 51.81.0.149 51.81.0.150 51.81.0.151 51.81.0.152 51.81.0.153 51.81.0.154 51.81.0.155 51.81.0.156 51.81.0.157 51.81.0.158 51.81.0.159 51.81.0.160 51.81.0.161 51.81.0.162 51.81.0.163 51.81.0.164 51.81.0.165 51.81.0.166 51.81.0.167 51.81.0.168 51.81.0.169 51.81.0.170 51.81.0.171 51.81.0.172 51.81.0.173 51.81.0.174 51.81.0.175 51.81.0.176 51.81.0.177 51.81.0.178 51.81.0.179 51.81.0.180 51.81.0.181 51.81.0.182 51.81.0.183 51.81.0.184 51.81.0.185 51.81.0.186 51.81.0.187 51.81.0.188 51.81.0.189 51.81.0.190 51.81.0.191 51.81.0.192 51.81.0.193 51.81.0.194 51.81.0.195 51.81.0.196 51.81.0.197 51.81.0.198 51.81.0.199 51.81.0.200 51.81.0.201 51.81.0.202 51.81.0.203 51.81.0.204 51.81.0.205 51.81.0.206 51.81.0.207 51.81.0.208 51.81.0.209 51.81.0.210 51.81.0.211 51.81.0.212 51.81.0.213 51.81.0.214 51.81.0.215 51.81.0.216 51.81.0.217 51.81.0.218 51.81.0.219 51.81.0.220 51.81.0.221 51.81.0.222 51.81.0.223 51.81.0.224 51.81.0.225 51.81.0.226 51.81.0.227 51.81.0.228 51.81.0.229 51.81.0.230 51.81.0.231 51.81.0.232 51.81.0.233 51.81.0.234 51.81.0.235 51.81.0.236 51.81.0.237 51.81.0.238 51.81.0.239 51.81.0.240 51.81.0.241 51.81.0.242 51.81.0.243 51.81.0.244 51.81.0.245 51.81.0.246 51.81.0.247 51.81.0.248 51.81.0.249 51.81.0.250 51.81.0.251 51.81.0.252 51.81.0.253 51.81.0.254 51.81.0.255 + 32.5K 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
51.81.0.0/17
Origin AS
AS16276
Announcement samples
24,209
Last seen
2026-07-18 11:34:49

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 ripe arin

Frequently Asked Questions

What is 51.81.0.0/17?

51.81.0.0/17 is a CIDR network block containing 32,768 IPv4 addresses (from 51.81.0.0 to 51.81.127.255). CIDR notation combines an IP address with a prefix length to define a range of addresses.

Who owns the 51.81.0.0/17 network?

The 51.81.0.0/17 range is allocated to OVH SAS and announced via AS16276 from United States.

Last updated: 2026-07-18 11:40:32 UTC
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