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CIDR Range

173.235.0.0/21

2.0K IPs /21 C Spire Fiber AS11272 United States ARIN
Addresses
2,048
2.0K
IP Range
173.235.0.0
→ 173.235.7.255
Sub-ranges
16+
within this block
PTR Density
62.1%
1.3K 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.

76/100
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 173.235.0.0/21

CIDRIPsOrganizationASNCountry
173.235.0.0/23 512 C Spire Fiber AS11272 US
173.235.2.0/23 512 C Spire Fiber AS11272 US
173.235.4.0/23 512 C Spire Fiber AS11272 US
173.235.6.0/23 512 C Spire Fiber AS11272 US
173.235.6.0/24 256 C Spire Fiber AS11272 US
173.235.7.128/25 128 C Spire Fiber AS11272 US
173.235.7.0/25 128 C Spire Fiber AS11272 US
173.235.7.128/26 64 C Spire Fiber AS11272 US
173.235.7.192/26 64 C Spire Fiber AS11272 US
173.235.7.0/26 64 C Spire Fiber AS11272 US
173.235.7.96/27 32 C Spire Fiber AS11272 US
173.235.7.128/27 32 C Spire Fiber AS11272 US
173.235.7.64/28 16 C Spire Fiber AS11272 US
173.235.7.160/28 16 C Spire Fiber AS11272 US
173.235.7.176/28 16 C Spire Fiber AS11272 US
173.235.7.80/28 16 C Spire Fiber AS11272 US

Geolocation

First 256 of 2,048 IP addresses in 173.235.0.0/21

173.235.0.0 173.235.0.1 173.235.0.2 173.235.0.3 173.235.0.4 173.235.0.5 173.235.0.6 173.235.0.7 173.235.0.8 173.235.0.9 173.235.0.10 173.235.0.11 173.235.0.12 173.235.0.13 173.235.0.14 173.235.0.15 173.235.0.16 173.235.0.17 173.235.0.18 173.235.0.19 173.235.0.20 173.235.0.21 173.235.0.22 173.235.0.23 173.235.0.24 173.235.0.25 173.235.0.26 173.235.0.27 173.235.0.28 173.235.0.29 173.235.0.30 173.235.0.31 173.235.0.32 173.235.0.33 173.235.0.34 173.235.0.35 173.235.0.36 173.235.0.37 173.235.0.38 173.235.0.39 173.235.0.40 173.235.0.41 173.235.0.42 173.235.0.43 173.235.0.44 173.235.0.45 173.235.0.46 173.235.0.47 173.235.0.48 173.235.0.49 173.235.0.50 173.235.0.51 173.235.0.52 173.235.0.53 173.235.0.54 173.235.0.55 173.235.0.56 173.235.0.57 173.235.0.58 173.235.0.59 173.235.0.60 173.235.0.61 173.235.0.62 173.235.0.63 173.235.0.64 173.235.0.65 173.235.0.66 173.235.0.67 173.235.0.68 173.235.0.69 173.235.0.70 173.235.0.71 173.235.0.72 173.235.0.73 173.235.0.74 173.235.0.75 173.235.0.76 173.235.0.77 173.235.0.78 173.235.0.79 173.235.0.80 173.235.0.81 173.235.0.82 173.235.0.83 173.235.0.84 173.235.0.85 173.235.0.86 173.235.0.87 173.235.0.88 173.235.0.89 173.235.0.90 173.235.0.91 173.235.0.92 173.235.0.93 173.235.0.94 173.235.0.95 173.235.0.96 173.235.0.97 173.235.0.98 173.235.0.99 173.235.0.100 173.235.0.101 173.235.0.102 173.235.0.103 173.235.0.104 173.235.0.105 173.235.0.106 173.235.0.107 173.235.0.108 173.235.0.109 173.235.0.110 173.235.0.111 173.235.0.112 173.235.0.113 173.235.0.114 173.235.0.115 173.235.0.116 173.235.0.117 173.235.0.118 173.235.0.119 173.235.0.120 173.235.0.121 173.235.0.122 173.235.0.123 173.235.0.124 173.235.0.125 173.235.0.126 173.235.0.127 173.235.0.128 173.235.0.129 173.235.0.130 173.235.0.131 173.235.0.132 173.235.0.133 173.235.0.134 173.235.0.135 173.235.0.136 173.235.0.137 173.235.0.138 173.235.0.139 173.235.0.140 173.235.0.141 173.235.0.142 173.235.0.143 173.235.0.144 173.235.0.145 173.235.0.146 173.235.0.147 173.235.0.148 173.235.0.149 173.235.0.150 173.235.0.151 173.235.0.152 173.235.0.153 173.235.0.154 173.235.0.155 173.235.0.156 173.235.0.157 173.235.0.158 173.235.0.159 173.235.0.160 173.235.0.161 173.235.0.162 173.235.0.163 173.235.0.164 173.235.0.165 173.235.0.166 173.235.0.167 173.235.0.168 173.235.0.169 173.235.0.170 173.235.0.171 173.235.0.172 173.235.0.173 173.235.0.174 173.235.0.175 173.235.0.176 173.235.0.177 173.235.0.178 173.235.0.179 173.235.0.180 173.235.0.181 173.235.0.182 173.235.0.183 173.235.0.184 173.235.0.185 173.235.0.186 173.235.0.187 173.235.0.188 173.235.0.189 173.235.0.190 173.235.0.191 173.235.0.192 173.235.0.193 173.235.0.194 173.235.0.195 173.235.0.196 173.235.0.197 173.235.0.198 173.235.0.199 173.235.0.200 173.235.0.201 173.235.0.202 173.235.0.203 173.235.0.204 173.235.0.205 173.235.0.206 173.235.0.207 173.235.0.208 173.235.0.209 173.235.0.210 173.235.0.211 173.235.0.212 173.235.0.213 173.235.0.214 173.235.0.215 173.235.0.216 173.235.0.217 173.235.0.218 173.235.0.219 173.235.0.220 173.235.0.221 173.235.0.222 173.235.0.223 173.235.0.224 173.235.0.225 173.235.0.226 173.235.0.227 173.235.0.228 173.235.0.229 173.235.0.230 173.235.0.231 173.235.0.232 173.235.0.233 173.235.0.234 173.235.0.235 173.235.0.236 173.235.0.237 173.235.0.238 173.235.0.239 173.235.0.240 173.235.0.241 173.235.0.242 173.235.0.243 173.235.0.244 173.235.0.245 173.235.0.246 173.235.0.247 173.235.0.248 173.235.0.249 173.235.0.250 173.235.0.251 173.235.0.252 173.235.0.253 173.235.0.254 173.235.0.255 + 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 173.235.0.0/16.

Announced prefix
173.235.0.0/16
Origin AS
AS11272
Announcement samples
24,570
Last seen
2026-09-12 08:05:05

Frequently Asked Questions

What is 173.235.0.0/21?

173.235.0.0/21 is a CIDR network block containing 2,048 IPv4 addresses (from 173.235.0.0 to 173.235.7.255). CIDR notation combines an IP address with a prefix length to define a range of addresses.

Who owns the 173.235.0.0/21 network?

The 173.235.0.0/21 range is allocated to C Spire Fiber and announced via AS11272 from United States.

Last updated: 2026-09-12 08:55:41 UTC
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