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CIDR Range

166.181.0.0/20

4.1K IPs /20 T-Mobile USA, Inc. AS6614 United States ARIN
Addresses
4,096
4.1K
IP Range
166.181.0.0
→ 166.181.15.255
Sub-ranges
5+
within this block
PTR Density
0.0%
0 of 4.1K 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.

62/100
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 166.181.0.0/20

CIDRIPsOrganizationASNCountry
166.181.8.0/21 2.0K T-Mobile USA, Inc. AS6614 US
166.181.0.0/22 1.0K T-Mobile USA, Inc. AS6614 US
166.181.4.0/23 512 T-Mobile USA, Inc. AS6614 US
166.181.6.0/24 256 T-Mobile USA, Inc. AS6614 US
166.181.7.0/24 256 T-Mobile USA, Inc. AS6614 US

Geolocation

First 256 of 4,096 IP addresses in 166.181.0.0/20

166.181.0.0 166.181.0.1 166.181.0.2 166.181.0.3 166.181.0.4 166.181.0.5 166.181.0.6 166.181.0.7 166.181.0.8 166.181.0.9 166.181.0.10 166.181.0.11 166.181.0.12 166.181.0.13 166.181.0.14 166.181.0.15 166.181.0.16 166.181.0.17 166.181.0.18 166.181.0.19 166.181.0.20 166.181.0.21 166.181.0.22 166.181.0.23 166.181.0.24 166.181.0.25 166.181.0.26 166.181.0.27 166.181.0.28 166.181.0.29 166.181.0.30 166.181.0.31 166.181.0.32 166.181.0.33 166.181.0.34 166.181.0.35 166.181.0.36 166.181.0.37 166.181.0.38 166.181.0.39 166.181.0.40 166.181.0.41 166.181.0.42 166.181.0.43 166.181.0.44 166.181.0.45 166.181.0.46 166.181.0.47 166.181.0.48 166.181.0.49 166.181.0.50 166.181.0.51 166.181.0.52 166.181.0.53 166.181.0.54 166.181.0.55 166.181.0.56 166.181.0.57 166.181.0.58 166.181.0.59 166.181.0.60 166.181.0.61 166.181.0.62 166.181.0.63 166.181.0.64 166.181.0.65 166.181.0.66 166.181.0.67 166.181.0.68 166.181.0.69 166.181.0.70 166.181.0.71 166.181.0.72 166.181.0.73 166.181.0.74 166.181.0.75 166.181.0.76 166.181.0.77 166.181.0.78 166.181.0.79 166.181.0.80 166.181.0.81 166.181.0.82 166.181.0.83 166.181.0.84 166.181.0.85 166.181.0.86 166.181.0.87 166.181.0.88 166.181.0.89 166.181.0.90 166.181.0.91 166.181.0.92 166.181.0.93 166.181.0.94 166.181.0.95 166.181.0.96 166.181.0.97 166.181.0.98 166.181.0.99 166.181.0.100 166.181.0.101 166.181.0.102 166.181.0.103 166.181.0.104 166.181.0.105 166.181.0.106 166.181.0.107 166.181.0.108 166.181.0.109 166.181.0.110 166.181.0.111 166.181.0.112 166.181.0.113 166.181.0.114 166.181.0.115 166.181.0.116 166.181.0.117 166.181.0.118 166.181.0.119 166.181.0.120 166.181.0.121 166.181.0.122 166.181.0.123 166.181.0.124 166.181.0.125 166.181.0.126 166.181.0.127 166.181.0.128 166.181.0.129 166.181.0.130 166.181.0.131 166.181.0.132 166.181.0.133 166.181.0.134 166.181.0.135 166.181.0.136 166.181.0.137 166.181.0.138 166.181.0.139 166.181.0.140 166.181.0.141 166.181.0.142 166.181.0.143 166.181.0.144 166.181.0.145 166.181.0.146 166.181.0.147 166.181.0.148 166.181.0.149 166.181.0.150 166.181.0.151 166.181.0.152 166.181.0.153 166.181.0.154 166.181.0.155 166.181.0.156 166.181.0.157 166.181.0.158 166.181.0.159 166.181.0.160 166.181.0.161 166.181.0.162 166.181.0.163 166.181.0.164 166.181.0.165 166.181.0.166 166.181.0.167 166.181.0.168 166.181.0.169 166.181.0.170 166.181.0.171 166.181.0.172 166.181.0.173 166.181.0.174 166.181.0.175 166.181.0.176 166.181.0.177 166.181.0.178 166.181.0.179 166.181.0.180 166.181.0.181 166.181.0.182 166.181.0.183 166.181.0.184 166.181.0.185 166.181.0.186 166.181.0.187 166.181.0.188 166.181.0.189 166.181.0.190 166.181.0.191 166.181.0.192 166.181.0.193 166.181.0.194 166.181.0.195 166.181.0.196 166.181.0.197 166.181.0.198 166.181.0.199 166.181.0.200 166.181.0.201 166.181.0.202 166.181.0.203 166.181.0.204 166.181.0.205 166.181.0.206 166.181.0.207 166.181.0.208 166.181.0.209 166.181.0.210 166.181.0.211 166.181.0.212 166.181.0.213 166.181.0.214 166.181.0.215 166.181.0.216 166.181.0.217 166.181.0.218 166.181.0.219 166.181.0.220 166.181.0.221 166.181.0.222 166.181.0.223 166.181.0.224 166.181.0.225 166.181.0.226 166.181.0.227 166.181.0.228 166.181.0.229 166.181.0.230 166.181.0.231 166.181.0.232 166.181.0.233 166.181.0.234 166.181.0.235 166.181.0.236 166.181.0.237 166.181.0.238 166.181.0.239 166.181.0.240 166.181.0.241 166.181.0.242 166.181.0.243 166.181.0.244 166.181.0.245 166.181.0.246 166.181.0.247 166.181.0.248 166.181.0.249 166.181.0.250 166.181.0.251 166.181.0.252 166.181.0.253 166.181.0.254 166.181.0.255 + 3.8K more (range too large to list inline)

BGP Routing

Live BGP anomalies →

Not announced as an exact prefix — covered by the announced supernet 166.181.0.0/16.

Announced prefix
166.181.0.0/16
Origin AS
AS6614
Announcement samples
3,219
Last seen
2026-07-19 23:02:49

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 166.181.0.0/20?

166.181.0.0/20 is a CIDR network block containing 4,096 IPv4 addresses (from 166.181.0.0 to 166.181.15.255). CIDR notation combines an IP address with a prefix length to define a range of addresses.

Who owns the 166.181.0.0/20 network?

The 166.181.0.0/20 range is allocated to T-Mobile USA, Inc. and announced via AS6614 from United States.

Last updated: 2026-07-19 23:10:35 UTC
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