172.81.0.0/16
55 assigned ranges in this /16.
/24 breakdown
| Block | Top country | Countries | ASNs | Ranges |
|---|---|---|---|---|
| 172.81.0.0/24 | Canada (100%) | 1 | 1 | 1 |
| 172.81.4.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.8.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.9.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.10.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.14.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.16.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.20.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.24.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.28.0/24 | Canada (100%) | 1 | 1 | 1 |
| 172.81.32.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.36.0/24 | Canada (100%) | 1 | 1 | 1 |
| 172.81.37.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.38.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.44.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.48.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.50.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.52.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.56.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.60.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.64.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.75.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.76.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.79.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.80.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.86.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.88.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.92.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.96.0/24 | Singapore (100%) | 1 | 1 | 1 |
| 172.81.100.0/24 | Hong Kong (100%) | 1 | 1 | 1 |
| 172.81.102.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.103.0/24 | Hong Kong (100%) | 1 | 1 | 1 |
| 172.81.104.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.105.0/24 | Hong Kong (100%) | 1 | 1 | 1 |
| 172.81.108.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.109.0/24 | Hong Kong (100%) | 1 | 1 | 1 |
| 172.81.110.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.112.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.116.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.120.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.127.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.128.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.136.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.139.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.140.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.144.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 172.81.148.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.152.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.156.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.176.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.184.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.188.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.189.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.191.0/24 | United States (100%) | 1 | 1 | 1 |
| 172.81.192.0/24 | China (100%) | 1 | 1 | 1 |
Assigned ranges
| Range | ASN | Org | Country |
|---|---|---|---|
172.81.0.0 – 172.81.3.255 | AS14673 | FiberSpeed | CA |
172.81.4.0 – 172.81.7.255 | AS30417 | BTIG LLC | US |
172.81.8.0 – 172.81.8.255 | AS7819 | Global IP Networks INC | US |
172.81.9.0 – 172.81.9.255 | AS46480 | Pekin Insurance | US |
172.81.10.0 – 172.81.11.255 | AS25629 | Albemarle County Public Schools | US |
172.81.14.0 – 172.81.14.255 | AS399298 | HealthAxis Group LLC | US |
172.81.16.0 – 172.81.19.255 | AS18519 | MTC Technologies | US |
172.81.20.0 – 172.81.23.255 | AS399091 | Inter Data Link Inc | US |
172.81.24.0 – 172.81.27.255 | AS19528 | US Signal Company L.L.C. | US |
172.81.28.0 – 172.81.31.255 | AS399194 | Satronics Satellites Sales and Service | CA |
172.81.32.0 – 172.81.33.255 | AS17303 | Network Advisors LLC | US |
172.81.36.0 – 172.81.36.255 | AS399218 | R B & W CORPORATION OF CANADA | CA |
172.81.37.0 – 172.81.37.255 | AS62943 | Missouri Network Alliance LLC | US |
172.81.38.0 – 172.81.39.255 | AS397095 | Three Lanterns LLC | US |
172.81.44.0 – 172.81.47.255 | AS399290 | Infinilink Broadband | US |
40 more ranges in this block.