251.73.19.128/25
PublicClass E (Reserved) — /25 prefix — 126 usable hosts
Network address — the base address of the block (251.73.19.128). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 251.73.19.255 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 | 251.73.19.128/25 |
| Network Address | 251.73.19.128 |
| Broadcast Address | 251.73.19.255 |
| Subnet Mask | 255.255.255.128 |
| Wildcard Mask | 0.0.0.127 |
| Prefix Length | /25 |
| IP Address Class | Class E (Reserved) |
| Total IP Addresses | 128 |
| Usable Host Addresses | 126 |
| First Usable IP | 251.73.19.129 |
| Last Usable IP | 251.73.19.254 |
| Network (Hex) | 0xFB491380 |
| Broadcast (Hex) | 0xFB4913FF |
| 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 251.73.19.128/25 into 2 equal /26 subnets (62 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 251.73.19.128/26 | 251.73.19.128 | 251.73.19.129 | 251.73.19.190 | 251.73.19.191 | 62 |
| 2 | 251.73.19.192/26 | 251.73.19.192 | 251.73.19.193 | 251.73.19.254 | 251.73.19.255 | 62 |
Split 251.73.19.128/25 into 4 equal /27 subnets (30 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 251.73.19.128/27 | 251.73.19.128 | 251.73.19.129 | 251.73.19.158 | 251.73.19.159 | 30 |
| 2 | 251.73.19.160/27 | 251.73.19.160 | 251.73.19.161 | 251.73.19.190 | 251.73.19.191 | 30 |
| 3 | 251.73.19.192/27 | 251.73.19.192 | 251.73.19.193 | 251.73.19.222 | 251.73.19.223 | 30 |
| 4 | 251.73.19.224/27 | 251.73.19.224 | 251.73.19.225 | 251.73.19.254 | 251.73.19.255 | 30 |
Split 251.73.19.128/25 into 8 equal /28 subnets (14 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 251.73.19.128/28 | 251.73.19.128 | 251.73.19.129 | 251.73.19.142 | 251.73.19.143 | 14 |
| 2 | 251.73.19.144/28 | 251.73.19.144 | 251.73.19.145 | 251.73.19.158 | 251.73.19.159 | 14 |
| 3 | 251.73.19.160/28 | 251.73.19.160 | 251.73.19.161 | 251.73.19.174 | 251.73.19.175 | 14 |
| 4 | 251.73.19.176/28 | 251.73.19.176 | 251.73.19.177 | 251.73.19.190 | 251.73.19.191 | 14 |
| 5 | 251.73.19.192/28 | 251.73.19.192 | 251.73.19.193 | 251.73.19.206 | 251.73.19.207 | 14 |
| 6 | 251.73.19.208/28 | 251.73.19.208 | 251.73.19.209 | 251.73.19.222 | 251.73.19.223 | 14 |
| 7 | 251.73.19.224/28 | 251.73.19.224 | 251.73.19.225 | 251.73.19.238 | 251.73.19.239 | 14 |
| 8 | 251.73.19.240/28 | 251.73.19.240 | 251.73.19.241 | 251.73.19.254 | 251.73.19.255 | 14 |
Split 251.73.19.128/25 into 16 equal /29 subnets (6 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 251.73.19.128/29 | 251.73.19.128 | 251.73.19.129 | 251.73.19.134 | 251.73.19.135 | 6 |
| 2 | 251.73.19.136/29 | 251.73.19.136 | 251.73.19.137 | 251.73.19.142 | 251.73.19.143 | 6 |
| 3 | 251.73.19.144/29 | 251.73.19.144 | 251.73.19.145 | 251.73.19.150 | 251.73.19.151 | 6 |
| 4 | 251.73.19.152/29 | 251.73.19.152 | 251.73.19.153 | 251.73.19.158 | 251.73.19.159 | 6 |
| 5 | 251.73.19.160/29 | 251.73.19.160 | 251.73.19.161 | 251.73.19.166 | 251.73.19.167 | 6 |
| 6 | 251.73.19.168/29 | 251.73.19.168 | 251.73.19.169 | 251.73.19.174 | 251.73.19.175 | 6 |
| 7 | 251.73.19.176/29 | 251.73.19.176 | 251.73.19.177 | 251.73.19.182 | 251.73.19.183 | 6 |
| 8 | 251.73.19.184/29 | 251.73.19.184 | 251.73.19.185 | 251.73.19.190 | 251.73.19.191 | 6 |
| 9 | 251.73.19.192/29 | 251.73.19.192 | 251.73.19.193 | 251.73.19.198 | 251.73.19.199 | 6 |
| 10 | 251.73.19.200/29 | 251.73.19.200 | 251.73.19.201 | 251.73.19.206 | 251.73.19.207 | 6 |
| 11 | 251.73.19.208/29 | 251.73.19.208 | 251.73.19.209 | 251.73.19.214 | 251.73.19.215 | 6 |
| 12 | 251.73.19.216/29 | 251.73.19.216 | 251.73.19.217 | 251.73.19.222 | 251.73.19.223 | 6 |
| 13 | 251.73.19.224/29 | 251.73.19.224 | 251.73.19.225 | 251.73.19.230 | 251.73.19.231 | 6 |
| 14 | 251.73.19.232/29 | 251.73.19.232 | 251.73.19.233 | 251.73.19.238 | 251.73.19.239 | 6 |
| 15 | 251.73.19.240/29 | 251.73.19.240 | 251.73.19.241 | 251.73.19.246 | 251.73.19.247 | 6 |
| 16 | 251.73.19.248/29 | 251.73.19.248 | 251.73.19.249 | 251.73.19.254 | 251.73.19.255 | 6 |
IP Address Sample
Showing first 16 of 128 total IPs.