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CIDR Range

137.164.0.0/19

8.2K IPs /19 CENIC AS2152 United States ARIN
Addresses
8,192
8.2K
IP Range
137.164.0.0
→ 137.164.31.255
Sub-ranges
26+
within this block
PTR Density
47.2%
3.9K of 8.2K 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.

80/100
Trusted
How this score is built

Experimental · trust-vectors model v1.1.0 — a transparent heuristic, not a definitive verdict. How it works →

Ranges inside 137.164.0.0/19

CIDRIPsOrganizationASNCountry
137.164.0.0/20 4.1K CENIC AS2152 US
137.164.0.0/20 4.1K CENIC AS2152 US
137.164.16.0/20 4.1K CENIC AS2152 US
137.164.0.0/21 2.0K CENIC AS2152 US
137.164.20.0/22 1.0K CENIC AS2152 US
137.164.8.0/22 1.0K CENIC AS2152 US
137.164.26.0/23 512 CENIC AS2153 US
137.164.18.0/23 512 CENIC AS2152 US
137.164.14.0/23 512 CENIC AS2152 US
137.164.30.0/23 512 CENIC AS2152 US
137.164.13.0/24 256 CENIC AS2152 US
137.164.25.0/24 256 CENIC AS2153 US
137.164.17.0/24 256 CENIC AS2153 US
137.164.16.0/24 256 CENIC AS2152 US
137.164.28.0/24 256 CENIC AS2153 US
137.164.29.0/24 256 CENIC AS2152 US
137.164.24.0/24 256 CENIC AS2152 US
137.164.12.128/25 128 CENIC AS2152 US
137.164.12.0/26 64 CENIC AS2152 US
137.164.12.64/27 32 CENIC AS2152 US
137.164.12.112/28 16 CENIC AS2152 US
137.164.12.96/29 8 CENIC AS2152 US
137.164.12.108/30 4 CENIC AS2152 US
137.164.12.104/31 2 CENIC AS2152 US
137.164.12.106/32 1 CENIC AS2152 US
137.164.12.107/32 1 CENIC AS2152 US

First 256 of 8,192 IP addresses in 137.164.0.0/19

137.164.0.0 137.164.0.1 137.164.0.2 137.164.0.3 137.164.0.4 137.164.0.5 137.164.0.6 137.164.0.7 137.164.0.8 137.164.0.9 137.164.0.10 137.164.0.11 137.164.0.12 137.164.0.13 137.164.0.14 137.164.0.15 137.164.0.16 137.164.0.17 137.164.0.18 137.164.0.19 137.164.0.20 137.164.0.21 137.164.0.22 137.164.0.23 137.164.0.24 137.164.0.25 137.164.0.26 137.164.0.27 137.164.0.28 137.164.0.29 137.164.0.30 137.164.0.31 137.164.0.32 137.164.0.33 137.164.0.34 137.164.0.35 137.164.0.36 137.164.0.37 137.164.0.38 137.164.0.39 137.164.0.40 137.164.0.41 137.164.0.42 137.164.0.43 137.164.0.44 137.164.0.45 137.164.0.46 137.164.0.47 137.164.0.48 137.164.0.49 137.164.0.50 137.164.0.51 137.164.0.52 137.164.0.53 137.164.0.54 137.164.0.55 137.164.0.56 137.164.0.57 137.164.0.58 137.164.0.59 137.164.0.60 137.164.0.61 137.164.0.62 137.164.0.63 137.164.0.64 137.164.0.65 137.164.0.66 137.164.0.67 137.164.0.68 137.164.0.69 137.164.0.70 137.164.0.71 137.164.0.72 137.164.0.73 137.164.0.74 137.164.0.75 137.164.0.76 137.164.0.77 137.164.0.78 137.164.0.79 137.164.0.80 137.164.0.81 137.164.0.82 137.164.0.83 137.164.0.84 137.164.0.85 137.164.0.86 137.164.0.87 137.164.0.88 137.164.0.89 137.164.0.90 137.164.0.91 137.164.0.92 137.164.0.93 137.164.0.94 137.164.0.95 137.164.0.96 137.164.0.97 137.164.0.98 137.164.0.99 137.164.0.100 137.164.0.101 137.164.0.102 137.164.0.103 137.164.0.104 137.164.0.105 137.164.0.106 137.164.0.107 137.164.0.108 137.164.0.109 137.164.0.110 137.164.0.111 137.164.0.112 137.164.0.113 137.164.0.114 137.164.0.115 137.164.0.116 137.164.0.117 137.164.0.118 137.164.0.119 137.164.0.120 137.164.0.121 137.164.0.122 137.164.0.123 137.164.0.124 137.164.0.125 137.164.0.126 137.164.0.127 137.164.0.128 137.164.0.129 137.164.0.130 137.164.0.131 137.164.0.132 137.164.0.133 137.164.0.134 137.164.0.135 137.164.0.136 137.164.0.137 137.164.0.138 137.164.0.139 137.164.0.140 137.164.0.141 137.164.0.142 137.164.0.143 137.164.0.144 137.164.0.145 137.164.0.146 137.164.0.147 137.164.0.148 137.164.0.149 137.164.0.150 137.164.0.151 137.164.0.152 137.164.0.153 137.164.0.154 137.164.0.155 137.164.0.156 137.164.0.157 137.164.0.158 137.164.0.159 137.164.0.160 137.164.0.161 137.164.0.162 137.164.0.163 137.164.0.164 137.164.0.165 137.164.0.166 137.164.0.167 137.164.0.168 137.164.0.169 137.164.0.170 137.164.0.171 137.164.0.172 137.164.0.173 137.164.0.174 137.164.0.175 137.164.0.176 137.164.0.177 137.164.0.178 137.164.0.179 137.164.0.180 137.164.0.181 137.164.0.182 137.164.0.183 137.164.0.184 137.164.0.185 137.164.0.186 137.164.0.187 137.164.0.188 137.164.0.189 137.164.0.190 137.164.0.191 137.164.0.192 137.164.0.193 137.164.0.194 137.164.0.195 137.164.0.196 137.164.0.197 137.164.0.198 137.164.0.199 137.164.0.200 137.164.0.201 137.164.0.202 137.164.0.203 137.164.0.204 137.164.0.205 137.164.0.206 137.164.0.207 137.164.0.208 137.164.0.209 137.164.0.210 137.164.0.211 137.164.0.212 137.164.0.213 137.164.0.214 137.164.0.215 137.164.0.216 137.164.0.217 137.164.0.218 137.164.0.219 137.164.0.220 137.164.0.221 137.164.0.222 137.164.0.223 137.164.0.224 137.164.0.225 137.164.0.226 137.164.0.227 137.164.0.228 137.164.0.229 137.164.0.230 137.164.0.231 137.164.0.232 137.164.0.233 137.164.0.234 137.164.0.235 137.164.0.236 137.164.0.237 137.164.0.238 137.164.0.239 137.164.0.240 137.164.0.241 137.164.0.242 137.164.0.243 137.164.0.244 137.164.0.245 137.164.0.246 137.164.0.247 137.164.0.248 137.164.0.249 137.164.0.250 137.164.0.251 137.164.0.252 137.164.0.253 137.164.0.254 137.164.0.255 + 7.9K more (range too large to list inline)

BGP Routing

Live BGP anomalies →

Not announced as an exact prefix — covered by the announced supernet 137.164.0.0/16.

Announced prefix
137.164.0.0/16
Origin AS
AS2152
Announcement samples
5,767
Last seen
2026-07-23 16:51:27

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 137.164.0.0/19?

137.164.0.0/19 is a CIDR network block containing 8,192 IPv4 addresses (from 137.164.0.0 to 137.164.31.255). CIDR notation combines an IP address with a prefix length to define a range of addresses.

Who owns the 137.164.0.0/19 network?

The 137.164.0.0/19 range is allocated to CENIC and announced via AS2152 from United States.

Last updated: 2026-07-23 16:55:32 UTC
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