123.159.102.128/25
PublicClass A — /25 prefix — 126 usable hosts
Network address — the base address of the block (123.159.102.128). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 123.159.102.255 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 | 123.159.102.128/25 |
| Network Address | 123.159.102.128 |
| Broadcast Address | 123.159.102.255 |
| 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 | 123.159.102.129 |
| Last Usable IP | 123.159.102.254 |
| Network (Hex) | 0x7B9F6680 |
| Broadcast (Hex) | 0x7B9F66FF |
| 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 123.159.102.128/25 into 2 equal /26 subnets (62 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 123.159.102.128/26 | 123.159.102.128 | 123.159.102.129 | 123.159.102.190 | 123.159.102.191 | 62 |
| 2 | 123.159.102.192/26 | 123.159.102.192 | 123.159.102.193 | 123.159.102.254 | 123.159.102.255 | 62 |
Split 123.159.102.128/25 into 4 equal /27 subnets (30 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 123.159.102.128/27 | 123.159.102.128 | 123.159.102.129 | 123.159.102.158 | 123.159.102.159 | 30 |
| 2 | 123.159.102.160/27 | 123.159.102.160 | 123.159.102.161 | 123.159.102.190 | 123.159.102.191 | 30 |
| 3 | 123.159.102.192/27 | 123.159.102.192 | 123.159.102.193 | 123.159.102.222 | 123.159.102.223 | 30 |
| 4 | 123.159.102.224/27 | 123.159.102.224 | 123.159.102.225 | 123.159.102.254 | 123.159.102.255 | 30 |
Split 123.159.102.128/25 into 8 equal /28 subnets (14 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 123.159.102.128/28 | 123.159.102.128 | 123.159.102.129 | 123.159.102.142 | 123.159.102.143 | 14 |
| 2 | 123.159.102.144/28 | 123.159.102.144 | 123.159.102.145 | 123.159.102.158 | 123.159.102.159 | 14 |
| 3 | 123.159.102.160/28 | 123.159.102.160 | 123.159.102.161 | 123.159.102.174 | 123.159.102.175 | 14 |
| 4 | 123.159.102.176/28 | 123.159.102.176 | 123.159.102.177 | 123.159.102.190 | 123.159.102.191 | 14 |
| 5 | 123.159.102.192/28 | 123.159.102.192 | 123.159.102.193 | 123.159.102.206 | 123.159.102.207 | 14 |
| 6 | 123.159.102.208/28 | 123.159.102.208 | 123.159.102.209 | 123.159.102.222 | 123.159.102.223 | 14 |
| 7 | 123.159.102.224/28 | 123.159.102.224 | 123.159.102.225 | 123.159.102.238 | 123.159.102.239 | 14 |
| 8 | 123.159.102.240/28 | 123.159.102.240 | 123.159.102.241 | 123.159.102.254 | 123.159.102.255 | 14 |
Split 123.159.102.128/25 into 16 equal /29 subnets (6 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 123.159.102.128/29 | 123.159.102.128 | 123.159.102.129 | 123.159.102.134 | 123.159.102.135 | 6 |
| 2 | 123.159.102.136/29 | 123.159.102.136 | 123.159.102.137 | 123.159.102.142 | 123.159.102.143 | 6 |
| 3 | 123.159.102.144/29 | 123.159.102.144 | 123.159.102.145 | 123.159.102.150 | 123.159.102.151 | 6 |
| 4 | 123.159.102.152/29 | 123.159.102.152 | 123.159.102.153 | 123.159.102.158 | 123.159.102.159 | 6 |
| 5 | 123.159.102.160/29 | 123.159.102.160 | 123.159.102.161 | 123.159.102.166 | 123.159.102.167 | 6 |
| 6 | 123.159.102.168/29 | 123.159.102.168 | 123.159.102.169 | 123.159.102.174 | 123.159.102.175 | 6 |
| 7 | 123.159.102.176/29 | 123.159.102.176 | 123.159.102.177 | 123.159.102.182 | 123.159.102.183 | 6 |
| 8 | 123.159.102.184/29 | 123.159.102.184 | 123.159.102.185 | 123.159.102.190 | 123.159.102.191 | 6 |
| 9 | 123.159.102.192/29 | 123.159.102.192 | 123.159.102.193 | 123.159.102.198 | 123.159.102.199 | 6 |
| 10 | 123.159.102.200/29 | 123.159.102.200 | 123.159.102.201 | 123.159.102.206 | 123.159.102.207 | 6 |
| 11 | 123.159.102.208/29 | 123.159.102.208 | 123.159.102.209 | 123.159.102.214 | 123.159.102.215 | 6 |
| 12 | 123.159.102.216/29 | 123.159.102.216 | 123.159.102.217 | 123.159.102.222 | 123.159.102.223 | 6 |
| 13 | 123.159.102.224/29 | 123.159.102.224 | 123.159.102.225 | 123.159.102.230 | 123.159.102.231 | 6 |
| 14 | 123.159.102.232/29 | 123.159.102.232 | 123.159.102.233 | 123.159.102.238 | 123.159.102.239 | 6 |
| 15 | 123.159.102.240/29 | 123.159.102.240 | 123.159.102.241 | 123.159.102.246 | 123.159.102.247 | 6 |
| 16 | 123.159.102.248/29 | 123.159.102.248 | 123.159.102.249 | 123.159.102.254 | 123.159.102.255 | 6 |
IP Address Sample
Showing first 16 of 128 total IPs.