31.81.168.0/25
PublicClass A — /25 prefix — 126 usable hosts
Network address — the base address of the block (31.81.168.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 31.81.168.127 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 | 31.81.168.0/25 |
| Network Address | 31.81.168.0 |
| Broadcast Address | 31.81.168.127 |
| 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 | 31.81.168.1 |
| Last Usable IP | 31.81.168.126 |
| Network (Hex) | 0x1F51A800 |
| Broadcast (Hex) | 0x1F51A87F |
| 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 31.81.168.0/25 into 2 equal /26 subnets (62 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 31.81.168.0/26 | 31.81.168.0 | 31.81.168.1 | 31.81.168.62 | 31.81.168.63 | 62 |
| 2 | 31.81.168.64/26 | 31.81.168.64 | 31.81.168.65 | 31.81.168.126 | 31.81.168.127 | 62 |
Split 31.81.168.0/25 into 4 equal /27 subnets (30 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 31.81.168.0/27 | 31.81.168.0 | 31.81.168.1 | 31.81.168.30 | 31.81.168.31 | 30 |
| 2 | 31.81.168.32/27 | 31.81.168.32 | 31.81.168.33 | 31.81.168.62 | 31.81.168.63 | 30 |
| 3 | 31.81.168.64/27 | 31.81.168.64 | 31.81.168.65 | 31.81.168.94 | 31.81.168.95 | 30 |
| 4 | 31.81.168.96/27 | 31.81.168.96 | 31.81.168.97 | 31.81.168.126 | 31.81.168.127 | 30 |
Split 31.81.168.0/25 into 8 equal /28 subnets (14 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 31.81.168.0/28 | 31.81.168.0 | 31.81.168.1 | 31.81.168.14 | 31.81.168.15 | 14 |
| 2 | 31.81.168.16/28 | 31.81.168.16 | 31.81.168.17 | 31.81.168.30 | 31.81.168.31 | 14 |
| 3 | 31.81.168.32/28 | 31.81.168.32 | 31.81.168.33 | 31.81.168.46 | 31.81.168.47 | 14 |
| 4 | 31.81.168.48/28 | 31.81.168.48 | 31.81.168.49 | 31.81.168.62 | 31.81.168.63 | 14 |
| 5 | 31.81.168.64/28 | 31.81.168.64 | 31.81.168.65 | 31.81.168.78 | 31.81.168.79 | 14 |
| 6 | 31.81.168.80/28 | 31.81.168.80 | 31.81.168.81 | 31.81.168.94 | 31.81.168.95 | 14 |
| 7 | 31.81.168.96/28 | 31.81.168.96 | 31.81.168.97 | 31.81.168.110 | 31.81.168.111 | 14 |
| 8 | 31.81.168.112/28 | 31.81.168.112 | 31.81.168.113 | 31.81.168.126 | 31.81.168.127 | 14 |
Split 31.81.168.0/25 into 16 equal /29 subnets (6 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 31.81.168.0/29 | 31.81.168.0 | 31.81.168.1 | 31.81.168.6 | 31.81.168.7 | 6 |
| 2 | 31.81.168.8/29 | 31.81.168.8 | 31.81.168.9 | 31.81.168.14 | 31.81.168.15 | 6 |
| 3 | 31.81.168.16/29 | 31.81.168.16 | 31.81.168.17 | 31.81.168.22 | 31.81.168.23 | 6 |
| 4 | 31.81.168.24/29 | 31.81.168.24 | 31.81.168.25 | 31.81.168.30 | 31.81.168.31 | 6 |
| 5 | 31.81.168.32/29 | 31.81.168.32 | 31.81.168.33 | 31.81.168.38 | 31.81.168.39 | 6 |
| 6 | 31.81.168.40/29 | 31.81.168.40 | 31.81.168.41 | 31.81.168.46 | 31.81.168.47 | 6 |
| 7 | 31.81.168.48/29 | 31.81.168.48 | 31.81.168.49 | 31.81.168.54 | 31.81.168.55 | 6 |
| 8 | 31.81.168.56/29 | 31.81.168.56 | 31.81.168.57 | 31.81.168.62 | 31.81.168.63 | 6 |
| 9 | 31.81.168.64/29 | 31.81.168.64 | 31.81.168.65 | 31.81.168.70 | 31.81.168.71 | 6 |
| 10 | 31.81.168.72/29 | 31.81.168.72 | 31.81.168.73 | 31.81.168.78 | 31.81.168.79 | 6 |
| 11 | 31.81.168.80/29 | 31.81.168.80 | 31.81.168.81 | 31.81.168.86 | 31.81.168.87 | 6 |
| 12 | 31.81.168.88/29 | 31.81.168.88 | 31.81.168.89 | 31.81.168.94 | 31.81.168.95 | 6 |
| 13 | 31.81.168.96/29 | 31.81.168.96 | 31.81.168.97 | 31.81.168.102 | 31.81.168.103 | 6 |
| 14 | 31.81.168.104/29 | 31.81.168.104 | 31.81.168.105 | 31.81.168.110 | 31.81.168.111 | 6 |
| 15 | 31.81.168.112/29 | 31.81.168.112 | 31.81.168.113 | 31.81.168.118 | 31.81.168.119 | 6 |
| 16 | 31.81.168.120/29 | 31.81.168.120 | 31.81.168.121 | 31.81.168.126 | 31.81.168.127 | 6 |
IP Address Sample
Showing first 16 of 128 total IPs.