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CIDR Range

8.21.128.0/18

16.4K IPs /18 United States ARIN
Addresses
16,384
16.4K
IP Range
8.21.128.0
→ 8.21.191.255
Sub-ranges
41+
within this block
PTR Density
5.3%
870 of 16.4K 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.

76/100
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 8.21.128.0/18

CIDRIPsOrganizationASNCountry
8.21.160.0/19 8.2K — — US
8.21.128.0/20 4.1K — — US
8.21.176.0/20 4.1K Level 3 Parent, LLC AS3356 US
8.21.176.0/20 4.1K Level 3 Parent, LLC AS3356 US
8.21.144.0/20 4.1K — — US
8.21.136.0/21 2.0K — — US
8.21.136.0/21 2.0K Level 3 Parent, LLC AS3356 US
8.21.136.0/21 2.0K Level 3 Parent, LLC AS3356 US
8.21.168.0/21 2.0K Level 3 Parent, LLC AS3356 US
8.21.152.0/21 2.0K Level 3 Parent, LLC AS3356 US
8.21.152.0/21 2.0K Level 3 Parent, LLC AS3356 US
8.21.128.0/21 2.0K — — US
8.21.168.0/21 2.0K Level 3 Parent, LLC AS3356 US
8.21.160.0/22 1.0K Level 3 Parent, LLC AS3356 US
8.21.160.0/22 1.0K Level 3 Parent, LLC AS3356 US
8.21.144.0/22 1.0K Level 3 Parent, LLC AS3356 US
8.21.144.0/22 1.0K Level 3 Parent, LLC AS3356 US
8.21.136.0/22 1.0K Level 3 Parent, LLC AS3356 US
8.21.132.0/22 1.0K Level 3 Parent, LLC AS3356 US
8.21.132.0/22 1.0K Level 3 Parent, LLC AS3356 US
8.21.166.0/23 512 Level 3 Parent, LLC AS3356 US
8.21.130.0/23 512 Level 3 Parent, LLC AS3356 US
8.21.130.0/23 512 Level 3 Parent, LLC AS3356 US
8.21.148.0/23 512 Level 3 Parent, LLC AS3356 US
8.21.148.0/23 512 Level 3 Parent, LLC AS3356 US
8.21.166.0/23 512 Level 3 Parent, LLC AS3356 US
8.21.140.0/23 512 Level 3 Parent, LLC AS3356 US
8.21.165.0/24 256 Level 3 Parent, LLC AS3356 US
8.21.164.0/24 256 8x8, Inc. AS32308 US
8.21.129.0/24 256 CARLTON FIELDS, P.A. AS55136 US
8.21.165.0/24 256 Level 3 Parent, LLC AS3356 US
8.21.164.0/24 256 8x8, Inc. AS32308 US
8.21.151.0/24 256 Restaurant Supply Chain Solutions, LLC AS393762 US
8.21.151.0/24 256 Restaurant Supply Chain Solutions, LLC AS393762 US
8.21.150.0/24 256 Level 3 Parent, LLC AS3356 US
8.21.150.0/24 256 Level 3 Parent, LLC AS3356 US
8.21.142.0/24 256 Level 3 Parent, LLC AS3356 US
8.21.143.0/24 256 CORELINK JAPAN AS136796 US
8.21.128.0/24 256 Level 3 Parent, LLC AS3356 US
8.21.129.0/24 256 CARLTON FIELDS, P.A. AS55136 US
8.21.128.0/24 256 Level 3 Parent, LLC AS3356 US

Geolocation

First 256 of 16,384 IP addresses in 8.21.128.0/18

8.21.128.0 8.21.128.1 8.21.128.2 8.21.128.3 8.21.128.4 8.21.128.5 8.21.128.6 8.21.128.7 8.21.128.8 8.21.128.9 8.21.128.10 8.21.128.11 8.21.128.12 8.21.128.13 8.21.128.14 8.21.128.15 8.21.128.16 8.21.128.17 8.21.128.18 8.21.128.19 8.21.128.20 8.21.128.21 8.21.128.22 8.21.128.23 8.21.128.24 8.21.128.25 8.21.128.26 8.21.128.27 8.21.128.28 8.21.128.29 8.21.128.30 8.21.128.31 8.21.128.32 8.21.128.33 8.21.128.34 8.21.128.35 8.21.128.36 8.21.128.37 8.21.128.38 8.21.128.39 8.21.128.40 8.21.128.41 8.21.128.42 8.21.128.43 8.21.128.44 8.21.128.45 8.21.128.46 8.21.128.47 8.21.128.48 8.21.128.49 8.21.128.50 8.21.128.51 8.21.128.52 8.21.128.53 8.21.128.54 8.21.128.55 8.21.128.56 8.21.128.57 8.21.128.58 8.21.128.59 8.21.128.60 8.21.128.61 8.21.128.62 8.21.128.63 8.21.128.64 8.21.128.65 8.21.128.66 8.21.128.67 8.21.128.68 8.21.128.69 8.21.128.70 8.21.128.71 8.21.128.72 8.21.128.73 8.21.128.74 8.21.128.75 8.21.128.76 8.21.128.77 8.21.128.78 8.21.128.79 8.21.128.80 8.21.128.81 8.21.128.82 8.21.128.83 8.21.128.84 8.21.128.85 8.21.128.86 8.21.128.87 8.21.128.88 8.21.128.89 8.21.128.90 8.21.128.91 8.21.128.92 8.21.128.93 8.21.128.94 8.21.128.95 8.21.128.96 8.21.128.97 8.21.128.98 8.21.128.99 8.21.128.100 8.21.128.101 8.21.128.102 8.21.128.103 8.21.128.104 8.21.128.105 8.21.128.106 8.21.128.107 8.21.128.108 8.21.128.109 8.21.128.110 8.21.128.111 8.21.128.112 8.21.128.113 8.21.128.114 8.21.128.115 8.21.128.116 8.21.128.117 8.21.128.118 8.21.128.119 8.21.128.120 8.21.128.121 8.21.128.122 8.21.128.123 8.21.128.124 8.21.128.125 8.21.128.126 8.21.128.127 8.21.128.128 8.21.128.129 8.21.128.130 8.21.128.131 8.21.128.132 8.21.128.133 8.21.128.134 8.21.128.135 8.21.128.136 8.21.128.137 8.21.128.138 8.21.128.139 8.21.128.140 8.21.128.141 8.21.128.142 8.21.128.143 8.21.128.144 8.21.128.145 8.21.128.146 8.21.128.147 8.21.128.148 8.21.128.149 8.21.128.150 8.21.128.151 8.21.128.152 8.21.128.153 8.21.128.154 8.21.128.155 8.21.128.156 8.21.128.157 8.21.128.158 8.21.128.159 8.21.128.160 8.21.128.161 8.21.128.162 8.21.128.163 8.21.128.164 8.21.128.165 8.21.128.166 8.21.128.167 8.21.128.168 8.21.128.169 8.21.128.170 8.21.128.171 8.21.128.172 8.21.128.173 8.21.128.174 8.21.128.175 8.21.128.176 8.21.128.177 8.21.128.178 8.21.128.179 8.21.128.180 8.21.128.181 8.21.128.182 8.21.128.183 8.21.128.184 8.21.128.185 8.21.128.186 8.21.128.187 8.21.128.188 8.21.128.189 8.21.128.190 8.21.128.191 8.21.128.192 8.21.128.193 8.21.128.194 8.21.128.195 8.21.128.196 8.21.128.197 8.21.128.198 8.21.128.199 8.21.128.200 8.21.128.201 8.21.128.202 8.21.128.203 8.21.128.204 8.21.128.205 8.21.128.206 8.21.128.207 8.21.128.208 8.21.128.209 8.21.128.210 8.21.128.211 8.21.128.212 8.21.128.213 8.21.128.214 8.21.128.215 8.21.128.216 8.21.128.217 8.21.128.218 8.21.128.219 8.21.128.220 8.21.128.221 8.21.128.222 8.21.128.223 8.21.128.224 8.21.128.225 8.21.128.226 8.21.128.227 8.21.128.228 8.21.128.229 8.21.128.230 8.21.128.231 8.21.128.232 8.21.128.233 8.21.128.234 8.21.128.235 8.21.128.236 8.21.128.237 8.21.128.238 8.21.128.239 8.21.128.240 8.21.128.241 8.21.128.242 8.21.128.243 8.21.128.244 8.21.128.245 8.21.128.246 8.21.128.247 8.21.128.248 8.21.128.249 8.21.128.250 8.21.128.251 8.21.128.252 8.21.128.253 8.21.128.254 8.21.128.255 + 16.1K more (range too large to list inline)

BGP Routing

Live BGP anomalies →

Not announced as an exact prefix — covered by the announced supernet 8.16.0.0/12.

Announced prefix
8.16.0.0/12
Origin AS
AS3356
Announcement samples
3,842
Last seen
2026-07-23 06:19:57

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 8.21.128.0/18?

8.21.128.0/18 is a CIDR network block containing 16,384 IPv4 addresses (from 8.21.128.0 to 8.21.191.255). CIDR notation combines an IP address with a prefix length to define a range of addresses.

Who owns the 8.21.128.0/18 network?

The 8.21.128.0/18 range is allocated to an unknown organization from United States.

Last updated: 2026-07-23 07:10:32 UTC
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