172.121.0.0/16
150 assigned ranges in this /16.
/24 breakdown
| Block | Top country | Countries | ASNs | Ranges |
|---|---|---|---|---|
| 172.121.0.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.1.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.2.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 172.121.3.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.4.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.5.0/24 | Malaysia (100%) | 1 | 1 | 1 |
| 172.121.6.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.7.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.8.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 172.121.9.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.10.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 172.121.11.0/24 | Romania (100%) | 1 | 1 | 1 |
| 172.121.13.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.14.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 172.121.16.0/24 | Romania (100%) | 1 | 1 | 1 |
| 172.121.18.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.19.0/24 | Romania (100%) | 1 | 1 | 1 |
| 172.121.20.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.22.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 172.121.23.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.24.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 172.121.25.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.26.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 172.121.27.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.28.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.29.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 172.121.32.0/24 | France (100%) | 1 | 1 | 1 |
| 172.121.33.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 172.121.34.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.36.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 172.121.37.0/24 | Romania (100%) | 1 | 1 | 1 |
| 172.121.39.0/24 | Japan (100%) | 1 | 1 | 1 |
| 172.121.40.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 172.121.41.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.42.0/24 | Cyprus (100%) | 1 | 1 | 1 |
| 172.121.43.0/24 | Romania (100%) | 1 | 1 | 1 |
| 172.121.44.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.48.0/24 | Cyprus (100%) | 1 | 1 | 1 |
| 172.121.49.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 172.121.50.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.52.0/24 | Cyprus (100%) | 1 | 1 | 1 |
| 172.121.53.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.54.0/24 | Romania (100%) | 1 | 1 | 1 |
| 172.121.56.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 172.121.57.0/24 | Romania (100%) | 1 | 1 | 1 |
| 172.121.58.0/24 | Cyprus (100%) | 1 | 1 | 1 |
| 172.121.60.0/24 | Romania (100%) | 1 | 1 | 1 |
| 172.121.61.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.62.0/24 | Romania (100%) | 1 | 1 | 1 |
| 172.121.64.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.65.0/24 | Romania (100%) | 1 | 1 | 1 |
| 172.121.66.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.67.0/24 | Cyprus (100%) | 1 | 1 | 1 |
| 172.121.68.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.72.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.73.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 172.121.74.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.77.0/24 | Cyprus (100%) | 1 | 1 | 1 |
| 172.121.78.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.79.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.80.0/24 | Cyprus (100%) | 1 | 1 | 1 |
| 172.121.81.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.82.0/24 | Cyprus (100%) | 1 | 1 | 1 |
| 172.121.84.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.85.0/24 | Cyprus (100%) | 1 | 1 | 1 |
| 172.121.86.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 172.121.87.0/24 | Romania (100%) | 1 | 1 | 1 |
| 172.121.88.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.96.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 172.121.97.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.98.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.104.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.105.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.107.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.109.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.110.0/24 | Seychelles (100%) | 1 | 1 | 1 |
| 172.121.111.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.112.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 172.121.113.0/24 | Romania (100%) | 1 | 1 | 1 |
| 172.121.114.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.115.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 172.121.116.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.119.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 172.121.120.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.122.0/24 | Romania (100%) | 1 | 1 | 1 |
| 172.121.123.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.124.0/24 | France (100%) | 1 | 1 | 1 |
| 172.121.125.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.126.0/24 | France (100%) | 1 | 1 | 1 |
| 172.121.127.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.128.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 172.121.129.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.130.0/24 | Romania (100%) | 1 | 1 | 1 |
| 172.121.131.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.132.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 172.121.133.0/24 | Romania (100%) | 1 | 1 | 1 |
| 172.121.134.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.136.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.138.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.139.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.141.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.143.0/24 | Romania (100%) | 1 | 1 | 1 |
| 172.121.144.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.145.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 172.121.147.0/24 | Romania (100%) | 1 | 1 | 1 |
| 172.121.148.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.150.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.151.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 172.121.152.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.155.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.156.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.157.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 172.121.158.0/24 | Romania (100%) | 1 | 1 | 1 |
| 172.121.159.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.160.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.161.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 172.121.162.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.170.0/24 | France (100%) | 1 | 1 | 1 |
| 172.121.171.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 172.121.172.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.175.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.176.0/24 | Dominican Republic (100%) | 1 | 1 | 1 |
| 172.121.178.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.179.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 172.121.181.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.182.0/24 | Japan (100%) | 1 | 1 | 1 |
| 172.121.183.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.184.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.185.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.188.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.189.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.190.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.191.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.192.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.224.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.232.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.234.0/24 | Romania (100%) | 1 | 1 | 1 |
| 172.121.235.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.236.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.241.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 172.121.242.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 172.121.243.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.244.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.248.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.249.0/24 | India (100%) | 1 | 1 | 1 |
| 172.121.250.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 172.121.251.0/24 | India (100%) | 1 | 1 | 1 |
| 172.121.252.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.121.254.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 172.121.255.0/24 | Romania (100%) | 1 | 1 | 1 |
Assigned ranges
| Range | ASN | Org | Country |
|---|---|---|---|
172.121.0.0 – 172.121.0.255 | AS18779 | EGIHosting | US |
172.121.1.0 – 172.121.1.255 | AS400536 | Nodestop LLC | US |
172.121.2.0 – 172.121.2.255 | AS212238 | Datacamp Limited | GB |
172.121.3.0 – 172.121.3.255 | AS397630 | Blazing SEO LLC | US |
172.121.4.0 – 172.121.4.255 | AS18779 | EGIHosting | US |
172.121.5.0 – 172.121.5.255 | AS149440 | Evoxt Sdn. Bhd. | MY |
172.121.6.0 – 172.121.6.255 | AS398781 | OCULUS NETWORKS INC | US |
172.121.7.0 – 172.121.7.255 | AS6939 | Hurricane Electric LLC | US |
172.121.8.0 – 172.121.8.255 | AS212238 | Datacamp Limited | GB |
172.121.9.0 – 172.121.9.255 | AS18779 | EGIHosting | US |
172.121.10.0 – 172.121.10.255 | AS212238 | Datacamp Limited | GB |
172.121.11.0 – 172.121.12.255 | AS9009 | M247 Europe SRL | RO |
172.121.13.0 – 172.121.13.255 | AS18779 | EGIHosting | US |
172.121.14.0 – 172.121.15.255 | AS212238 | Datacamp Limited | GB |
172.121.16.0 – 172.121.16.255 | AS9009 | M247 Europe SRL | RO |
135 more ranges in this block.