21.252.2.128/25
PublicClass A — /25 prefix — 126 usable hosts
Network address — the base address of the block (21.252.2.128). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 21.252.2.255 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 | 21.252.2.128/25 |
| Network Address | 21.252.2.128 |
| Broadcast Address | 21.252.2.255 |
| 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 | 21.252.2.129 |
| Last Usable IP | 21.252.2.254 |
| Network (Hex) | 0x15FC0280 |
| Broadcast (Hex) | 0x15FC02FF |
| 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 21.252.2.128/25 into 2 equal /26 subnets (62 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 21.252.2.128/26 | 21.252.2.128 | 21.252.2.129 | 21.252.2.190 | 21.252.2.191 | 62 |
| 2 | 21.252.2.192/26 | 21.252.2.192 | 21.252.2.193 | 21.252.2.254 | 21.252.2.255 | 62 |
Split 21.252.2.128/25 into 4 equal /27 subnets (30 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 21.252.2.128/27 | 21.252.2.128 | 21.252.2.129 | 21.252.2.158 | 21.252.2.159 | 30 |
| 2 | 21.252.2.160/27 | 21.252.2.160 | 21.252.2.161 | 21.252.2.190 | 21.252.2.191 | 30 |
| 3 | 21.252.2.192/27 | 21.252.2.192 | 21.252.2.193 | 21.252.2.222 | 21.252.2.223 | 30 |
| 4 | 21.252.2.224/27 | 21.252.2.224 | 21.252.2.225 | 21.252.2.254 | 21.252.2.255 | 30 |
Split 21.252.2.128/25 into 8 equal /28 subnets (14 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 21.252.2.128/28 | 21.252.2.128 | 21.252.2.129 | 21.252.2.142 | 21.252.2.143 | 14 |
| 2 | 21.252.2.144/28 | 21.252.2.144 | 21.252.2.145 | 21.252.2.158 | 21.252.2.159 | 14 |
| 3 | 21.252.2.160/28 | 21.252.2.160 | 21.252.2.161 | 21.252.2.174 | 21.252.2.175 | 14 |
| 4 | 21.252.2.176/28 | 21.252.2.176 | 21.252.2.177 | 21.252.2.190 | 21.252.2.191 | 14 |
| 5 | 21.252.2.192/28 | 21.252.2.192 | 21.252.2.193 | 21.252.2.206 | 21.252.2.207 | 14 |
| 6 | 21.252.2.208/28 | 21.252.2.208 | 21.252.2.209 | 21.252.2.222 | 21.252.2.223 | 14 |
| 7 | 21.252.2.224/28 | 21.252.2.224 | 21.252.2.225 | 21.252.2.238 | 21.252.2.239 | 14 |
| 8 | 21.252.2.240/28 | 21.252.2.240 | 21.252.2.241 | 21.252.2.254 | 21.252.2.255 | 14 |
Split 21.252.2.128/25 into 16 equal /29 subnets (6 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 21.252.2.128/29 | 21.252.2.128 | 21.252.2.129 | 21.252.2.134 | 21.252.2.135 | 6 |
| 2 | 21.252.2.136/29 | 21.252.2.136 | 21.252.2.137 | 21.252.2.142 | 21.252.2.143 | 6 |
| 3 | 21.252.2.144/29 | 21.252.2.144 | 21.252.2.145 | 21.252.2.150 | 21.252.2.151 | 6 |
| 4 | 21.252.2.152/29 | 21.252.2.152 | 21.252.2.153 | 21.252.2.158 | 21.252.2.159 | 6 |
| 5 | 21.252.2.160/29 | 21.252.2.160 | 21.252.2.161 | 21.252.2.166 | 21.252.2.167 | 6 |
| 6 | 21.252.2.168/29 | 21.252.2.168 | 21.252.2.169 | 21.252.2.174 | 21.252.2.175 | 6 |
| 7 | 21.252.2.176/29 | 21.252.2.176 | 21.252.2.177 | 21.252.2.182 | 21.252.2.183 | 6 |
| 8 | 21.252.2.184/29 | 21.252.2.184 | 21.252.2.185 | 21.252.2.190 | 21.252.2.191 | 6 |
| 9 | 21.252.2.192/29 | 21.252.2.192 | 21.252.2.193 | 21.252.2.198 | 21.252.2.199 | 6 |
| 10 | 21.252.2.200/29 | 21.252.2.200 | 21.252.2.201 | 21.252.2.206 | 21.252.2.207 | 6 |
| 11 | 21.252.2.208/29 | 21.252.2.208 | 21.252.2.209 | 21.252.2.214 | 21.252.2.215 | 6 |
| 12 | 21.252.2.216/29 | 21.252.2.216 | 21.252.2.217 | 21.252.2.222 | 21.252.2.223 | 6 |
| 13 | 21.252.2.224/29 | 21.252.2.224 | 21.252.2.225 | 21.252.2.230 | 21.252.2.231 | 6 |
| 14 | 21.252.2.232/29 | 21.252.2.232 | 21.252.2.233 | 21.252.2.238 | 21.252.2.239 | 6 |
| 15 | 21.252.2.240/29 | 21.252.2.240 | 21.252.2.241 | 21.252.2.246 | 21.252.2.247 | 6 |
| 16 | 21.252.2.248/29 | 21.252.2.248 | 21.252.2.249 | 21.252.2.254 | 21.252.2.255 | 6 |
IP Address Sample
Showing first 16 of 128 total IPs.