81.237.252.128/26
PublicClass A — /26 prefix — 62 usable hosts
Network address — the base address of the block (81.237.252.128). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 81.237.252.191 are delivered to every device in the subnet. Also reserved — not assignable.
Usable hosts — the 62 addresses between those two that you can assign to servers, VMs, or interfaces.
Subnet mask — 255.255.255.192 is the dotted-decimal equivalent of /26. Older tools and Cisco configs use this format instead of CIDR slash notation.
Full Details
| CIDR Notation | 81.237.252.128/26 |
| Network Address | 81.237.252.128 |
| Broadcast Address | 81.237.252.191 |
| Subnet Mask | 255.255.255.192 |
| Wildcard Mask | 0.0.0.63 |
| Prefix Length | /26 |
| IP Address Class | Class A |
| Total IP Addresses | 64 |
| Usable Host Addresses | 62 |
| First Usable IP | 81.237.252.129 |
| Last Usable IP | 81.237.252.190 |
| Network (Hex) | 0x51EDFC80 |
| Broadcast (Hex) | 0x51EDFCBF |
| Address Type | Public / Globally Routable |
Binary Representation
The first 26 bits (1s in the mask) identify the network. The remaining 6 bits identify hosts within the network.
Split into Equal Subnets
Split 81.237.252.128/26 into 2 equal /27 subnets (30 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 81.237.252.128/27 | 81.237.252.128 | 81.237.252.129 | 81.237.252.158 | 81.237.252.159 | 30 |
| 2 | 81.237.252.160/27 | 81.237.252.160 | 81.237.252.161 | 81.237.252.190 | 81.237.252.191 | 30 |
Split 81.237.252.128/26 into 4 equal /28 subnets (14 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 81.237.252.128/28 | 81.237.252.128 | 81.237.252.129 | 81.237.252.142 | 81.237.252.143 | 14 |
| 2 | 81.237.252.144/28 | 81.237.252.144 | 81.237.252.145 | 81.237.252.158 | 81.237.252.159 | 14 |
| 3 | 81.237.252.160/28 | 81.237.252.160 | 81.237.252.161 | 81.237.252.174 | 81.237.252.175 | 14 |
| 4 | 81.237.252.176/28 | 81.237.252.176 | 81.237.252.177 | 81.237.252.190 | 81.237.252.191 | 14 |
Split 81.237.252.128/26 into 8 equal /29 subnets (6 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 81.237.252.128/29 | 81.237.252.128 | 81.237.252.129 | 81.237.252.134 | 81.237.252.135 | 6 |
| 2 | 81.237.252.136/29 | 81.237.252.136 | 81.237.252.137 | 81.237.252.142 | 81.237.252.143 | 6 |
| 3 | 81.237.252.144/29 | 81.237.252.144 | 81.237.252.145 | 81.237.252.150 | 81.237.252.151 | 6 |
| 4 | 81.237.252.152/29 | 81.237.252.152 | 81.237.252.153 | 81.237.252.158 | 81.237.252.159 | 6 |
| 5 | 81.237.252.160/29 | 81.237.252.160 | 81.237.252.161 | 81.237.252.166 | 81.237.252.167 | 6 |
| 6 | 81.237.252.168/29 | 81.237.252.168 | 81.237.252.169 | 81.237.252.174 | 81.237.252.175 | 6 |
| 7 | 81.237.252.176/29 | 81.237.252.176 | 81.237.252.177 | 81.237.252.182 | 81.237.252.183 | 6 |
| 8 | 81.237.252.184/29 | 81.237.252.184 | 81.237.252.185 | 81.237.252.190 | 81.237.252.191 | 6 |
Split 81.237.252.128/26 into 16 equal /30 subnets (2 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 81.237.252.128/30 | 81.237.252.128 | 81.237.252.129 | 81.237.252.130 | 81.237.252.131 | 2 |
| 2 | 81.237.252.132/30 | 81.237.252.132 | 81.237.252.133 | 81.237.252.134 | 81.237.252.135 | 2 |
| 3 | 81.237.252.136/30 | 81.237.252.136 | 81.237.252.137 | 81.237.252.138 | 81.237.252.139 | 2 |
| 4 | 81.237.252.140/30 | 81.237.252.140 | 81.237.252.141 | 81.237.252.142 | 81.237.252.143 | 2 |
| 5 | 81.237.252.144/30 | 81.237.252.144 | 81.237.252.145 | 81.237.252.146 | 81.237.252.147 | 2 |
| 6 | 81.237.252.148/30 | 81.237.252.148 | 81.237.252.149 | 81.237.252.150 | 81.237.252.151 | 2 |
| 7 | 81.237.252.152/30 | 81.237.252.152 | 81.237.252.153 | 81.237.252.154 | 81.237.252.155 | 2 |
| 8 | 81.237.252.156/30 | 81.237.252.156 | 81.237.252.157 | 81.237.252.158 | 81.237.252.159 | 2 |
| 9 | 81.237.252.160/30 | 81.237.252.160 | 81.237.252.161 | 81.237.252.162 | 81.237.252.163 | 2 |
| 10 | 81.237.252.164/30 | 81.237.252.164 | 81.237.252.165 | 81.237.252.166 | 81.237.252.167 | 2 |
| 11 | 81.237.252.168/30 | 81.237.252.168 | 81.237.252.169 | 81.237.252.170 | 81.237.252.171 | 2 |
| 12 | 81.237.252.172/30 | 81.237.252.172 | 81.237.252.173 | 81.237.252.174 | 81.237.252.175 | 2 |
| 13 | 81.237.252.176/30 | 81.237.252.176 | 81.237.252.177 | 81.237.252.178 | 81.237.252.179 | 2 |
| 14 | 81.237.252.180/30 | 81.237.252.180 | 81.237.252.181 | 81.237.252.182 | 81.237.252.183 | 2 |
| 15 | 81.237.252.184/30 | 81.237.252.184 | 81.237.252.185 | 81.237.252.186 | 81.237.252.187 | 2 |
| 16 | 81.237.252.188/30 | 81.237.252.188 | 81.237.252.189 | 81.237.252.190 | 81.237.252.191 | 2 |
IP Address Sample
Showing first 16 of 64 total IPs.