81.252.74.0/25
PublicClass A — /25 prefix — 126 usable hosts
Network address — the base address of the block (81.252.74.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 81.252.74.127 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 | 81.252.74.0/25 |
| Network Address | 81.252.74.0 |
| Broadcast Address | 81.252.74.127 |
| 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 | 81.252.74.1 |
| Last Usable IP | 81.252.74.126 |
| Network (Hex) | 0x51FC4A00 |
| Broadcast (Hex) | 0x51FC4A7F |
| 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 81.252.74.0/25 into 2 equal /26 subnets (62 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 81.252.74.0/26 | 81.252.74.0 | 81.252.74.1 | 81.252.74.62 | 81.252.74.63 | 62 |
| 2 | 81.252.74.64/26 | 81.252.74.64 | 81.252.74.65 | 81.252.74.126 | 81.252.74.127 | 62 |
Split 81.252.74.0/25 into 4 equal /27 subnets (30 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 81.252.74.0/27 | 81.252.74.0 | 81.252.74.1 | 81.252.74.30 | 81.252.74.31 | 30 |
| 2 | 81.252.74.32/27 | 81.252.74.32 | 81.252.74.33 | 81.252.74.62 | 81.252.74.63 | 30 |
| 3 | 81.252.74.64/27 | 81.252.74.64 | 81.252.74.65 | 81.252.74.94 | 81.252.74.95 | 30 |
| 4 | 81.252.74.96/27 | 81.252.74.96 | 81.252.74.97 | 81.252.74.126 | 81.252.74.127 | 30 |
Split 81.252.74.0/25 into 8 equal /28 subnets (14 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 81.252.74.0/28 | 81.252.74.0 | 81.252.74.1 | 81.252.74.14 | 81.252.74.15 | 14 |
| 2 | 81.252.74.16/28 | 81.252.74.16 | 81.252.74.17 | 81.252.74.30 | 81.252.74.31 | 14 |
| 3 | 81.252.74.32/28 | 81.252.74.32 | 81.252.74.33 | 81.252.74.46 | 81.252.74.47 | 14 |
| 4 | 81.252.74.48/28 | 81.252.74.48 | 81.252.74.49 | 81.252.74.62 | 81.252.74.63 | 14 |
| 5 | 81.252.74.64/28 | 81.252.74.64 | 81.252.74.65 | 81.252.74.78 | 81.252.74.79 | 14 |
| 6 | 81.252.74.80/28 | 81.252.74.80 | 81.252.74.81 | 81.252.74.94 | 81.252.74.95 | 14 |
| 7 | 81.252.74.96/28 | 81.252.74.96 | 81.252.74.97 | 81.252.74.110 | 81.252.74.111 | 14 |
| 8 | 81.252.74.112/28 | 81.252.74.112 | 81.252.74.113 | 81.252.74.126 | 81.252.74.127 | 14 |
Split 81.252.74.0/25 into 16 equal /29 subnets (6 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 81.252.74.0/29 | 81.252.74.0 | 81.252.74.1 | 81.252.74.6 | 81.252.74.7 | 6 |
| 2 | 81.252.74.8/29 | 81.252.74.8 | 81.252.74.9 | 81.252.74.14 | 81.252.74.15 | 6 |
| 3 | 81.252.74.16/29 | 81.252.74.16 | 81.252.74.17 | 81.252.74.22 | 81.252.74.23 | 6 |
| 4 | 81.252.74.24/29 | 81.252.74.24 | 81.252.74.25 | 81.252.74.30 | 81.252.74.31 | 6 |
| 5 | 81.252.74.32/29 | 81.252.74.32 | 81.252.74.33 | 81.252.74.38 | 81.252.74.39 | 6 |
| 6 | 81.252.74.40/29 | 81.252.74.40 | 81.252.74.41 | 81.252.74.46 | 81.252.74.47 | 6 |
| 7 | 81.252.74.48/29 | 81.252.74.48 | 81.252.74.49 | 81.252.74.54 | 81.252.74.55 | 6 |
| 8 | 81.252.74.56/29 | 81.252.74.56 | 81.252.74.57 | 81.252.74.62 | 81.252.74.63 | 6 |
| 9 | 81.252.74.64/29 | 81.252.74.64 | 81.252.74.65 | 81.252.74.70 | 81.252.74.71 | 6 |
| 10 | 81.252.74.72/29 | 81.252.74.72 | 81.252.74.73 | 81.252.74.78 | 81.252.74.79 | 6 |
| 11 | 81.252.74.80/29 | 81.252.74.80 | 81.252.74.81 | 81.252.74.86 | 81.252.74.87 | 6 |
| 12 | 81.252.74.88/29 | 81.252.74.88 | 81.252.74.89 | 81.252.74.94 | 81.252.74.95 | 6 |
| 13 | 81.252.74.96/29 | 81.252.74.96 | 81.252.74.97 | 81.252.74.102 | 81.252.74.103 | 6 |
| 14 | 81.252.74.104/29 | 81.252.74.104 | 81.252.74.105 | 81.252.74.110 | 81.252.74.111 | 6 |
| 15 | 81.252.74.112/29 | 81.252.74.112 | 81.252.74.113 | 81.252.74.118 | 81.252.74.119 | 6 |
| 16 | 81.252.74.120/29 | 81.252.74.120 | 81.252.74.121 | 81.252.74.126 | 81.252.74.127 | 6 |
IP Address Sample
Showing first 16 of 128 total IPs.