21.252.57.0/25
PublicClass A — /25 prefix — 126 usable hosts
Network address — the base address of the block (21.252.57.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 21.252.57.127 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 | 21.252.57.0/25 |
| Network Address | 21.252.57.0 |
| Broadcast Address | 21.252.57.127 |
| 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 | 21.252.57.1 |
| Last Usable IP | 21.252.57.126 |
| Network (Hex) | 0x15FC3900 |
| Broadcast (Hex) | 0x15FC397F |
| 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 21.252.57.0/25 into 2 equal /26 subnets (62 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 21.252.57.0/26 | 21.252.57.0 | 21.252.57.1 | 21.252.57.62 | 21.252.57.63 | 62 |
| 2 | 21.252.57.64/26 | 21.252.57.64 | 21.252.57.65 | 21.252.57.126 | 21.252.57.127 | 62 |
Split 21.252.57.0/25 into 4 equal /27 subnets (30 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 21.252.57.0/27 | 21.252.57.0 | 21.252.57.1 | 21.252.57.30 | 21.252.57.31 | 30 |
| 2 | 21.252.57.32/27 | 21.252.57.32 | 21.252.57.33 | 21.252.57.62 | 21.252.57.63 | 30 |
| 3 | 21.252.57.64/27 | 21.252.57.64 | 21.252.57.65 | 21.252.57.94 | 21.252.57.95 | 30 |
| 4 | 21.252.57.96/27 | 21.252.57.96 | 21.252.57.97 | 21.252.57.126 | 21.252.57.127 | 30 |
Split 21.252.57.0/25 into 8 equal /28 subnets (14 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 21.252.57.0/28 | 21.252.57.0 | 21.252.57.1 | 21.252.57.14 | 21.252.57.15 | 14 |
| 2 | 21.252.57.16/28 | 21.252.57.16 | 21.252.57.17 | 21.252.57.30 | 21.252.57.31 | 14 |
| 3 | 21.252.57.32/28 | 21.252.57.32 | 21.252.57.33 | 21.252.57.46 | 21.252.57.47 | 14 |
| 4 | 21.252.57.48/28 | 21.252.57.48 | 21.252.57.49 | 21.252.57.62 | 21.252.57.63 | 14 |
| 5 | 21.252.57.64/28 | 21.252.57.64 | 21.252.57.65 | 21.252.57.78 | 21.252.57.79 | 14 |
| 6 | 21.252.57.80/28 | 21.252.57.80 | 21.252.57.81 | 21.252.57.94 | 21.252.57.95 | 14 |
| 7 | 21.252.57.96/28 | 21.252.57.96 | 21.252.57.97 | 21.252.57.110 | 21.252.57.111 | 14 |
| 8 | 21.252.57.112/28 | 21.252.57.112 | 21.252.57.113 | 21.252.57.126 | 21.252.57.127 | 14 |
Split 21.252.57.0/25 into 16 equal /29 subnets (6 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 21.252.57.0/29 | 21.252.57.0 | 21.252.57.1 | 21.252.57.6 | 21.252.57.7 | 6 |
| 2 | 21.252.57.8/29 | 21.252.57.8 | 21.252.57.9 | 21.252.57.14 | 21.252.57.15 | 6 |
| 3 | 21.252.57.16/29 | 21.252.57.16 | 21.252.57.17 | 21.252.57.22 | 21.252.57.23 | 6 |
| 4 | 21.252.57.24/29 | 21.252.57.24 | 21.252.57.25 | 21.252.57.30 | 21.252.57.31 | 6 |
| 5 | 21.252.57.32/29 | 21.252.57.32 | 21.252.57.33 | 21.252.57.38 | 21.252.57.39 | 6 |
| 6 | 21.252.57.40/29 | 21.252.57.40 | 21.252.57.41 | 21.252.57.46 | 21.252.57.47 | 6 |
| 7 | 21.252.57.48/29 | 21.252.57.48 | 21.252.57.49 | 21.252.57.54 | 21.252.57.55 | 6 |
| 8 | 21.252.57.56/29 | 21.252.57.56 | 21.252.57.57 | 21.252.57.62 | 21.252.57.63 | 6 |
| 9 | 21.252.57.64/29 | 21.252.57.64 | 21.252.57.65 | 21.252.57.70 | 21.252.57.71 | 6 |
| 10 | 21.252.57.72/29 | 21.252.57.72 | 21.252.57.73 | 21.252.57.78 | 21.252.57.79 | 6 |
| 11 | 21.252.57.80/29 | 21.252.57.80 | 21.252.57.81 | 21.252.57.86 | 21.252.57.87 | 6 |
| 12 | 21.252.57.88/29 | 21.252.57.88 | 21.252.57.89 | 21.252.57.94 | 21.252.57.95 | 6 |
| 13 | 21.252.57.96/29 | 21.252.57.96 | 21.252.57.97 | 21.252.57.102 | 21.252.57.103 | 6 |
| 14 | 21.252.57.104/29 | 21.252.57.104 | 21.252.57.105 | 21.252.57.110 | 21.252.57.111 | 6 |
| 15 | 21.252.57.112/29 | 21.252.57.112 | 21.252.57.113 | 21.252.57.118 | 21.252.57.119 | 6 |
| 16 | 21.252.57.120/29 | 21.252.57.120 | 21.252.57.121 | 21.252.57.126 | 21.252.57.127 | 6 |
IP Address Sample
Showing first 16 of 128 total IPs.