12.237.8.128/25
PublicClass A — /25 prefix — 126 usable hosts
Network address — the base address of the block (12.237.8.128). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 12.237.8.255 are delivered to every device in the subnet. Also reserved — not assignable.
Usable hosts — the 126 addresses between those two that you can assign to servers, VMs, or interfaces.
Subnet mask — 255.255.255.128 is the dotted-decimal equivalent of /25. Older tools and Cisco configs use this format instead of CIDR slash notation.
Full Details
| CIDR Notation | 12.237.8.128/25 |
| Network Address | 12.237.8.128 |
| Broadcast Address | 12.237.8.255 |
| Subnet Mask | 255.255.255.128 |
| Wildcard Mask | 0.0.0.127 |
| Prefix Length | /25 |
| IP Address Class | Class A |
| Total IP Addresses | 128 |
| Usable Host Addresses | 126 |
| First Usable IP | 12.237.8.129 |
| Last Usable IP | 12.237.8.254 |
| Network (Hex) | 0x0CED0880 |
| Broadcast (Hex) | 0x0CED08FF |
| Address Type | Public / Globally Routable |
Binary Representation
The first 25 bits (1s in the mask) identify the network. The remaining 7 bits identify hosts within the network.
Split into Equal Subnets
Split 12.237.8.128/25 into 2 equal /26 subnets (62 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 12.237.8.128/26 | 12.237.8.128 | 12.237.8.129 | 12.237.8.190 | 12.237.8.191 | 62 |
| 2 | 12.237.8.192/26 | 12.237.8.192 | 12.237.8.193 | 12.237.8.254 | 12.237.8.255 | 62 |
Split 12.237.8.128/25 into 4 equal /27 subnets (30 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 12.237.8.128/27 | 12.237.8.128 | 12.237.8.129 | 12.237.8.158 | 12.237.8.159 | 30 |
| 2 | 12.237.8.160/27 | 12.237.8.160 | 12.237.8.161 | 12.237.8.190 | 12.237.8.191 | 30 |
| 3 | 12.237.8.192/27 | 12.237.8.192 | 12.237.8.193 | 12.237.8.222 | 12.237.8.223 | 30 |
| 4 | 12.237.8.224/27 | 12.237.8.224 | 12.237.8.225 | 12.237.8.254 | 12.237.8.255 | 30 |
Split 12.237.8.128/25 into 8 equal /28 subnets (14 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 12.237.8.128/28 | 12.237.8.128 | 12.237.8.129 | 12.237.8.142 | 12.237.8.143 | 14 |
| 2 | 12.237.8.144/28 | 12.237.8.144 | 12.237.8.145 | 12.237.8.158 | 12.237.8.159 | 14 |
| 3 | 12.237.8.160/28 | 12.237.8.160 | 12.237.8.161 | 12.237.8.174 | 12.237.8.175 | 14 |
| 4 | 12.237.8.176/28 | 12.237.8.176 | 12.237.8.177 | 12.237.8.190 | 12.237.8.191 | 14 |
| 5 | 12.237.8.192/28 | 12.237.8.192 | 12.237.8.193 | 12.237.8.206 | 12.237.8.207 | 14 |
| 6 | 12.237.8.208/28 | 12.237.8.208 | 12.237.8.209 | 12.237.8.222 | 12.237.8.223 | 14 |
| 7 | 12.237.8.224/28 | 12.237.8.224 | 12.237.8.225 | 12.237.8.238 | 12.237.8.239 | 14 |
| 8 | 12.237.8.240/28 | 12.237.8.240 | 12.237.8.241 | 12.237.8.254 | 12.237.8.255 | 14 |
Split 12.237.8.128/25 into 16 equal /29 subnets (6 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 12.237.8.128/29 | 12.237.8.128 | 12.237.8.129 | 12.237.8.134 | 12.237.8.135 | 6 |
| 2 | 12.237.8.136/29 | 12.237.8.136 | 12.237.8.137 | 12.237.8.142 | 12.237.8.143 | 6 |
| 3 | 12.237.8.144/29 | 12.237.8.144 | 12.237.8.145 | 12.237.8.150 | 12.237.8.151 | 6 |
| 4 | 12.237.8.152/29 | 12.237.8.152 | 12.237.8.153 | 12.237.8.158 | 12.237.8.159 | 6 |
| 5 | 12.237.8.160/29 | 12.237.8.160 | 12.237.8.161 | 12.237.8.166 | 12.237.8.167 | 6 |
| 6 | 12.237.8.168/29 | 12.237.8.168 | 12.237.8.169 | 12.237.8.174 | 12.237.8.175 | 6 |
| 7 | 12.237.8.176/29 | 12.237.8.176 | 12.237.8.177 | 12.237.8.182 | 12.237.8.183 | 6 |
| 8 | 12.237.8.184/29 | 12.237.8.184 | 12.237.8.185 | 12.237.8.190 | 12.237.8.191 | 6 |
| 9 | 12.237.8.192/29 | 12.237.8.192 | 12.237.8.193 | 12.237.8.198 | 12.237.8.199 | 6 |
| 10 | 12.237.8.200/29 | 12.237.8.200 | 12.237.8.201 | 12.237.8.206 | 12.237.8.207 | 6 |
| 11 | 12.237.8.208/29 | 12.237.8.208 | 12.237.8.209 | 12.237.8.214 | 12.237.8.215 | 6 |
| 12 | 12.237.8.216/29 | 12.237.8.216 | 12.237.8.217 | 12.237.8.222 | 12.237.8.223 | 6 |
| 13 | 12.237.8.224/29 | 12.237.8.224 | 12.237.8.225 | 12.237.8.230 | 12.237.8.231 | 6 |
| 14 | 12.237.8.232/29 | 12.237.8.232 | 12.237.8.233 | 12.237.8.238 | 12.237.8.239 | 6 |
| 15 | 12.237.8.240/29 | 12.237.8.240 | 12.237.8.241 | 12.237.8.246 | 12.237.8.247 | 6 |
| 16 | 12.237.8.248/29 | 12.237.8.248 | 12.237.8.249 | 12.237.8.254 | 12.237.8.255 | 6 |
IP Address Sample
Showing first 16 of 128 total IPs.