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CIDR Range

75.111.16.0/21

2.0K IPs /21 Optimum AS19108 United States ARIN
Addresses
2,048
2.0K
IP Range
75.111.16.0
→ 75.111.23.255
Sub-ranges
23+
within this block
PTR Density
0.0%
0 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.

71/100
Moderate
How this score is built

Experimental · trust-vectors model v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →

Ranges inside 75.111.16.0/21

CIDRIPsOrganizationASNCountry
75.111.16.0/22 1.0K Optimum AS19108 US
75.111.16.0/22 1.0K Optimum AS19108 US
75.111.20.0/23 512 Optimum AS19108 US
75.111.20.0/23 512 Optimum AS19108 US
75.111.23.0/24 256 Optimum AS19108 US
75.111.23.0/24 256 Optimum AS19108 US
75.111.22.128/25 128 Optimum AS19108 US
75.111.22.128/25 128 Optimum AS19108 US
75.111.22.0/26 64 Optimum AS19108 US
75.111.22.0/26 64 Optimum AS19108 US
75.111.22.96/27 32 Optimum AS19108 US
75.111.22.96/27 32 Optimum AS19108 US
75.111.22.80/28 16 Optimum AS19108 US
75.111.22.80/28 16 Optimum AS19108 US
75.111.22.72/29 8 Optimum AS19108 US
75.111.22.72/29 8 Optimum AS19108 US
75.111.22.68/30 4 Optimum AS19108 US
75.111.22.68/30 4 Optimum AS19108 US
75.111.22.66/31 2 Optimum AS19108 US
75.111.22.66/31 2 Optimum AS19108 US
75.111.22.65/32 1 Optimum AS19108 US
75.111.22.64/32 1 Optimum AS19108 US
75.111.22.64/32 1 Optimum AS19108 US

Geolocation

First 256 of 2,048 IP addresses in 75.111.16.0/21

75.111.16.0 75.111.16.1 75.111.16.2 75.111.16.3 75.111.16.4 75.111.16.5 75.111.16.6 75.111.16.7 75.111.16.8 75.111.16.9 75.111.16.10 75.111.16.11 75.111.16.12 75.111.16.13 75.111.16.14 75.111.16.15 75.111.16.16 75.111.16.17 75.111.16.18 75.111.16.19 75.111.16.20 75.111.16.21 75.111.16.22 75.111.16.23 75.111.16.24 75.111.16.25 75.111.16.26 75.111.16.27 75.111.16.28 75.111.16.29 75.111.16.30 75.111.16.31 75.111.16.32 75.111.16.33 75.111.16.34 75.111.16.35 75.111.16.36 75.111.16.37 75.111.16.38 75.111.16.39 75.111.16.40 75.111.16.41 75.111.16.42 75.111.16.43 75.111.16.44 75.111.16.45 75.111.16.46 75.111.16.47 75.111.16.48 75.111.16.49 75.111.16.50 75.111.16.51 75.111.16.52 75.111.16.53 75.111.16.54 75.111.16.55 75.111.16.56 75.111.16.57 75.111.16.58 75.111.16.59 75.111.16.60 75.111.16.61 75.111.16.62 75.111.16.63 75.111.16.64 75.111.16.65 75.111.16.66 75.111.16.67 75.111.16.68 75.111.16.69 75.111.16.70 75.111.16.71 75.111.16.72 75.111.16.73 75.111.16.74 75.111.16.75 75.111.16.76 75.111.16.77 75.111.16.78 75.111.16.79 75.111.16.80 75.111.16.81 75.111.16.82 75.111.16.83 75.111.16.84 75.111.16.85 75.111.16.86 75.111.16.87 75.111.16.88 75.111.16.89 75.111.16.90 75.111.16.91 75.111.16.92 75.111.16.93 75.111.16.94 75.111.16.95 75.111.16.96 75.111.16.97 75.111.16.98 75.111.16.99 75.111.16.100 75.111.16.101 75.111.16.102 75.111.16.103 75.111.16.104 75.111.16.105 75.111.16.106 75.111.16.107 75.111.16.108 75.111.16.109 75.111.16.110 75.111.16.111 75.111.16.112 75.111.16.113 75.111.16.114 75.111.16.115 75.111.16.116 75.111.16.117 75.111.16.118 75.111.16.119 75.111.16.120 75.111.16.121 75.111.16.122 75.111.16.123 75.111.16.124 75.111.16.125 75.111.16.126 75.111.16.127 75.111.16.128 75.111.16.129 75.111.16.130 75.111.16.131 75.111.16.132 75.111.16.133 75.111.16.134 75.111.16.135 75.111.16.136 75.111.16.137 75.111.16.138 75.111.16.139 75.111.16.140 75.111.16.141 75.111.16.142 75.111.16.143 75.111.16.144 75.111.16.145 75.111.16.146 75.111.16.147 75.111.16.148 75.111.16.149 75.111.16.150 75.111.16.151 75.111.16.152 75.111.16.153 75.111.16.154 75.111.16.155 75.111.16.156 75.111.16.157 75.111.16.158 75.111.16.159 75.111.16.160 75.111.16.161 75.111.16.162 75.111.16.163 75.111.16.164 75.111.16.165 75.111.16.166 75.111.16.167 75.111.16.168 75.111.16.169 75.111.16.170 75.111.16.171 75.111.16.172 75.111.16.173 75.111.16.174 75.111.16.175 75.111.16.176 75.111.16.177 75.111.16.178 75.111.16.179 75.111.16.180 75.111.16.181 75.111.16.182 75.111.16.183 75.111.16.184 75.111.16.185 75.111.16.186 75.111.16.187 75.111.16.188 75.111.16.189 75.111.16.190 75.111.16.191 75.111.16.192 75.111.16.193 75.111.16.194 75.111.16.195 75.111.16.196 75.111.16.197 75.111.16.198 75.111.16.199 75.111.16.200 75.111.16.201 75.111.16.202 75.111.16.203 75.111.16.204 75.111.16.205 75.111.16.206 75.111.16.207 75.111.16.208 75.111.16.209 75.111.16.210 75.111.16.211 75.111.16.212 75.111.16.213 75.111.16.214 75.111.16.215 75.111.16.216 75.111.16.217 75.111.16.218 75.111.16.219 75.111.16.220 75.111.16.221 75.111.16.222 75.111.16.223 75.111.16.224 75.111.16.225 75.111.16.226 75.111.16.227 75.111.16.228 75.111.16.229 75.111.16.230 75.111.16.231 75.111.16.232 75.111.16.233 75.111.16.234 75.111.16.235 75.111.16.236 75.111.16.237 75.111.16.238 75.111.16.239 75.111.16.240 75.111.16.241 75.111.16.242 75.111.16.243 75.111.16.244 75.111.16.245 75.111.16.246 75.111.16.247 75.111.16.248 75.111.16.249 75.111.16.250 75.111.16.251 75.111.16.252 75.111.16.253 75.111.16.254 75.111.16.255 + 1.8K more (range too large to list inline)

BGP Routing

Live BGP anomalies →

Not announced as an exact prefix — covered by the announced supernet 75.111.0.0/18.

Announced prefix
75.111.0.0/18
Origin AS
AS19108
Announcement samples
3,612
Last seen
2026-07-24 07:42:31

RIR Ownership History

Atom feed ⇲

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

Date Event From To
2026-05-10 New Allocation — US

Frequently Asked Questions

What is 75.111.16.0/21?

75.111.16.0/21 is a CIDR network block containing 2,048 IPv4 addresses (from 75.111.16.0 to 75.111.23.255). CIDR notation combines an IP address with a prefix length to define a range of addresses.

Who owns the 75.111.16.0/21 network?

The 75.111.16.0/21 range is allocated to Optimum and announced via AS19108 from United States.

Last updated: 2026-07-24 08:10:33 UTC
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