10.21.118.128/25
Private (RFC 1918) RFC 1918Class A — /25 prefix — 126 usable hosts
Network address — the base address of the block (10.21.118.128). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 10.21.118.255 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 | 10.21.118.128/25 |
| Network Address | 10.21.118.128 |
| Broadcast Address | 10.21.118.255 |
| 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 | 10.21.118.129 |
| Last Usable IP | 10.21.118.254 |
| Network (Hex) | 0x0A157680 |
| Broadcast (Hex) | 0x0A1576FF |
| Governing RFC | RFC 1918 |
| Address Type | Private (RFC 1918) |
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 10.21.118.128/25 into 2 equal /26 subnets (62 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 10.21.118.128/26 | 10.21.118.128 | 10.21.118.129 | 10.21.118.190 | 10.21.118.191 | 62 |
| 2 | 10.21.118.192/26 | 10.21.118.192 | 10.21.118.193 | 10.21.118.254 | 10.21.118.255 | 62 |
Split 10.21.118.128/25 into 4 equal /27 subnets (30 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 10.21.118.128/27 | 10.21.118.128 | 10.21.118.129 | 10.21.118.158 | 10.21.118.159 | 30 |
| 2 | 10.21.118.160/27 | 10.21.118.160 | 10.21.118.161 | 10.21.118.190 | 10.21.118.191 | 30 |
| 3 | 10.21.118.192/27 | 10.21.118.192 | 10.21.118.193 | 10.21.118.222 | 10.21.118.223 | 30 |
| 4 | 10.21.118.224/27 | 10.21.118.224 | 10.21.118.225 | 10.21.118.254 | 10.21.118.255 | 30 |
Split 10.21.118.128/25 into 8 equal /28 subnets (14 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 10.21.118.128/28 | 10.21.118.128 | 10.21.118.129 | 10.21.118.142 | 10.21.118.143 | 14 |
| 2 | 10.21.118.144/28 | 10.21.118.144 | 10.21.118.145 | 10.21.118.158 | 10.21.118.159 | 14 |
| 3 | 10.21.118.160/28 | 10.21.118.160 | 10.21.118.161 | 10.21.118.174 | 10.21.118.175 | 14 |
| 4 | 10.21.118.176/28 | 10.21.118.176 | 10.21.118.177 | 10.21.118.190 | 10.21.118.191 | 14 |
| 5 | 10.21.118.192/28 | 10.21.118.192 | 10.21.118.193 | 10.21.118.206 | 10.21.118.207 | 14 |
| 6 | 10.21.118.208/28 | 10.21.118.208 | 10.21.118.209 | 10.21.118.222 | 10.21.118.223 | 14 |
| 7 | 10.21.118.224/28 | 10.21.118.224 | 10.21.118.225 | 10.21.118.238 | 10.21.118.239 | 14 |
| 8 | 10.21.118.240/28 | 10.21.118.240 | 10.21.118.241 | 10.21.118.254 | 10.21.118.255 | 14 |
Split 10.21.118.128/25 into 16 equal /29 subnets (6 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 10.21.118.128/29 | 10.21.118.128 | 10.21.118.129 | 10.21.118.134 | 10.21.118.135 | 6 |
| 2 | 10.21.118.136/29 | 10.21.118.136 | 10.21.118.137 | 10.21.118.142 | 10.21.118.143 | 6 |
| 3 | 10.21.118.144/29 | 10.21.118.144 | 10.21.118.145 | 10.21.118.150 | 10.21.118.151 | 6 |
| 4 | 10.21.118.152/29 | 10.21.118.152 | 10.21.118.153 | 10.21.118.158 | 10.21.118.159 | 6 |
| 5 | 10.21.118.160/29 | 10.21.118.160 | 10.21.118.161 | 10.21.118.166 | 10.21.118.167 | 6 |
| 6 | 10.21.118.168/29 | 10.21.118.168 | 10.21.118.169 | 10.21.118.174 | 10.21.118.175 | 6 |
| 7 | 10.21.118.176/29 | 10.21.118.176 | 10.21.118.177 | 10.21.118.182 | 10.21.118.183 | 6 |
| 8 | 10.21.118.184/29 | 10.21.118.184 | 10.21.118.185 | 10.21.118.190 | 10.21.118.191 | 6 |
| 9 | 10.21.118.192/29 | 10.21.118.192 | 10.21.118.193 | 10.21.118.198 | 10.21.118.199 | 6 |
| 10 | 10.21.118.200/29 | 10.21.118.200 | 10.21.118.201 | 10.21.118.206 | 10.21.118.207 | 6 |
| 11 | 10.21.118.208/29 | 10.21.118.208 | 10.21.118.209 | 10.21.118.214 | 10.21.118.215 | 6 |
| 12 | 10.21.118.216/29 | 10.21.118.216 | 10.21.118.217 | 10.21.118.222 | 10.21.118.223 | 6 |
| 13 | 10.21.118.224/29 | 10.21.118.224 | 10.21.118.225 | 10.21.118.230 | 10.21.118.231 | 6 |
| 14 | 10.21.118.232/29 | 10.21.118.232 | 10.21.118.233 | 10.21.118.238 | 10.21.118.239 | 6 |
| 15 | 10.21.118.240/29 | 10.21.118.240 | 10.21.118.241 | 10.21.118.246 | 10.21.118.247 | 6 |
| 16 | 10.21.118.248/29 | 10.21.118.248 | 10.21.118.249 | 10.21.118.254 | 10.21.118.255 | 6 |
IP Address Sample
Showing first 16 of 128 total IPs.