81.31.0.0/16
48 assigned ranges in this /16.
/24 breakdown
| Block | Top country | Countries | ASNs | Ranges |
|---|---|---|---|---|
| 81.31.0.0/24 | United States (100%) | 1 | 1 | 1 |
| 81.31.28.0/24 | France (100%) | 1 | 1 | 1 |
| 81.31.29.0/24 | United States (100%) | 1 | 1 | 1 |
| 81.31.32.0/24 | Czechia (100%) | 1 | 1 | 1 |
| 81.31.48.0/24 | Finland (100%) | 1 | 1 | 1 |
| 81.31.64.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 81.31.80.0/24 | Denmark (100%) | 1 | 1 | 1 |
| 81.31.96.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 81.31.128.0/24 | United States (100%) | 1 | 1 | 1 |
| 81.31.144.0/24 | Italy (100%) | 1 | 1 | 1 |
| 81.31.160.0/24 | Iran (100%) | 1 | 1 | 1 |
| 81.31.174.0/24 | Iran (100%) | 1 | 1 | 1 |
| 81.31.187.0/24 | Iran (100%) | 1 | 1 | 1 |
| 81.31.192.0/24 | United Arab Emirates (100%) | 1 | 1 | 1 |
| 81.31.193.0/24 | United States (100%) | 1 | 1 | 1 |
| 81.31.194.0/24 | Seychelles (100%) | 1 | 1 | 1 |
| 81.31.196.0/24 | Spain (100%) | 1 | 1 | 1 |
| 81.31.197.0/24 | Netherlands (100%) | 1 | 1 | 1 |
| 81.31.198.0/24 | Lithuania (100%) | 1 | 1 | 1 |
| 81.31.199.0/24 | Germany (100%) | 1 | 1 | 1 |
| 81.31.200.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 81.31.204.0/24 | France (100%) | 1 | 1 | 1 |
| 81.31.208.0/24 | Singapore (100%) | 1 | 1 | 1 |
| 81.31.209.0/24 | Ukraine (100%) | 1 | 1 | 1 |
| 81.31.210.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 81.31.212.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 81.31.213.0/24 | United States (100%) | 1 | 1 | 1 |
| 81.31.214.0/24 | Germany (100%) | 1 | 1 | 1 |
| 81.31.215.0/24 | Netherlands (100%) | 1 | 1 | 1 |
| 81.31.224.0/24 | Iran (100%) | 1 | 1 | 1 |
| 81.31.228.0/24 | Greece (100%) | 1 | 1 | 1 |
| 81.31.229.0/24 | Iran (100%) | 1 | 1 | 1 |
| 81.31.230.0/24 | Greece (100%) | 1 | 1 | 1 |
| 81.31.231.0/24 | United Kingdom (100%) | 1 | 1 | 1 |
| 81.31.232.0/24 | United States (100%) | 1 | 1 | 1 |
| 81.31.233.0/24 | Iran (100%) | 1 | 1 | 1 |
| 81.31.234.0/24 | Thailand (100%) | 1 | 1 | 1 |
| 81.31.235.0/24 | Lithuania (100%) | 1 | 1 | 1 |
| 81.31.236.0/24 | Iran (100%) | 1 | 1 | 1 |
| 81.31.238.0/24 | Greece (100%) | 1 | 1 | 1 |
| 81.31.239.0/24 | Iran (100%) | 1 | 1 | 1 |
| 81.31.242.0/24 | United States (100%) | 1 | 1 | 1 |
| 81.31.244.0/24 | Kazakhstan (100%) | 1 | 1 | 1 |
| 81.31.246.0/24 | Russia (100%) | 1 | 1 | 1 |
| 81.31.247.0/24 | Russia (100%) | 1 | 1 | 1 |
| 81.31.248.0/24 | Iran (100%) | 1 | 1 | 1 |
| 81.31.250.0/24 | Iran (100%) | 1 | 1 | 1 |
| 81.31.252.0/24 | Germany (100%) | 1 | 1 | 1 |
Assigned ranges
| Range | ASN | Org | Country |
|---|---|---|---|
81.31.0.0 – 81.31.27.255 | AS3257 | GTT Communications Inc. | US |
81.31.28.0 – 81.31.28.255 | AS397025 | Alstom Transport SA | FR |
81.31.29.0 – 81.31.31.255 | AS3257 | GTT Communications Inc. | US |
81.31.32.0 – 81.31.47.255 | AS24971 | MasterDC s.r.o. | CZ |
81.31.48.0 – 81.31.63.255 | AS41242 | Sofor Oy | FI |
81.31.64.0 – 81.31.79.255 | AS12519 | FastNet International Ltd | GB |
81.31.80.0 – 81.31.95.255 | AS3292 | TDC Holding A/S | DK |
81.31.96.0 – 81.31.127.255 | AS8468 | Cityfibre Limited | GB |
81.31.128.0 – 81.31.143.255 | AS7029 | Windstream Communications LLC | US |
81.31.144.0 – 81.31.159.255 | AS47242 | Host SpA | IT |
81.31.160.0 – 81.31.173.255 | AS12660 | Sharif University Of Technology | IR |
81.31.174.0 – 81.31.186.255 | AS12660 | Sharif University Of Technology | IR |
81.31.187.0 – 81.31.191.255 | AS12660 | Sharif University Of Technology | IR |
81.31.192.0 – 81.31.192.255 | AS215730 | H2NEXUS CLOUD SERVICES - FZCO | AE |
81.31.193.0 – 81.31.193.255 | AS398781 | OCULUS NETWORKS INC | US |
33 more ranges in this block.