65.1.20.0/25
PublicClass A — /25 prefix — 126 usable hosts
Network address — the base address of the block (65.1.20.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 65.1.20.127 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 | 65.1.20.0/25 |
| Network Address | 65.1.20.0 |
| Broadcast Address | 65.1.20.127 |
| 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 | 65.1.20.1 |
| Last Usable IP | 65.1.20.126 |
| Network (Hex) | 0x41011400 |
| Broadcast (Hex) | 0x4101147F |
| 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 65.1.20.0/25 into 2 equal /26 subnets (62 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 65.1.20.0/26 | 65.1.20.0 | 65.1.20.1 | 65.1.20.62 | 65.1.20.63 | 62 |
| 2 | 65.1.20.64/26 | 65.1.20.64 | 65.1.20.65 | 65.1.20.126 | 65.1.20.127 | 62 |
Split 65.1.20.0/25 into 4 equal /27 subnets (30 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 65.1.20.0/27 | 65.1.20.0 | 65.1.20.1 | 65.1.20.30 | 65.1.20.31 | 30 |
| 2 | 65.1.20.32/27 | 65.1.20.32 | 65.1.20.33 | 65.1.20.62 | 65.1.20.63 | 30 |
| 3 | 65.1.20.64/27 | 65.1.20.64 | 65.1.20.65 | 65.1.20.94 | 65.1.20.95 | 30 |
| 4 | 65.1.20.96/27 | 65.1.20.96 | 65.1.20.97 | 65.1.20.126 | 65.1.20.127 | 30 |
Split 65.1.20.0/25 into 8 equal /28 subnets (14 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 65.1.20.0/28 | 65.1.20.0 | 65.1.20.1 | 65.1.20.14 | 65.1.20.15 | 14 |
| 2 | 65.1.20.16/28 | 65.1.20.16 | 65.1.20.17 | 65.1.20.30 | 65.1.20.31 | 14 |
| 3 | 65.1.20.32/28 | 65.1.20.32 | 65.1.20.33 | 65.1.20.46 | 65.1.20.47 | 14 |
| 4 | 65.1.20.48/28 | 65.1.20.48 | 65.1.20.49 | 65.1.20.62 | 65.1.20.63 | 14 |
| 5 | 65.1.20.64/28 | 65.1.20.64 | 65.1.20.65 | 65.1.20.78 | 65.1.20.79 | 14 |
| 6 | 65.1.20.80/28 | 65.1.20.80 | 65.1.20.81 | 65.1.20.94 | 65.1.20.95 | 14 |
| 7 | 65.1.20.96/28 | 65.1.20.96 | 65.1.20.97 | 65.1.20.110 | 65.1.20.111 | 14 |
| 8 | 65.1.20.112/28 | 65.1.20.112 | 65.1.20.113 | 65.1.20.126 | 65.1.20.127 | 14 |
Split 65.1.20.0/25 into 16 equal /29 subnets (6 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 65.1.20.0/29 | 65.1.20.0 | 65.1.20.1 | 65.1.20.6 | 65.1.20.7 | 6 |
| 2 | 65.1.20.8/29 | 65.1.20.8 | 65.1.20.9 | 65.1.20.14 | 65.1.20.15 | 6 |
| 3 | 65.1.20.16/29 | 65.1.20.16 | 65.1.20.17 | 65.1.20.22 | 65.1.20.23 | 6 |
| 4 | 65.1.20.24/29 | 65.1.20.24 | 65.1.20.25 | 65.1.20.30 | 65.1.20.31 | 6 |
| 5 | 65.1.20.32/29 | 65.1.20.32 | 65.1.20.33 | 65.1.20.38 | 65.1.20.39 | 6 |
| 6 | 65.1.20.40/29 | 65.1.20.40 | 65.1.20.41 | 65.1.20.46 | 65.1.20.47 | 6 |
| 7 | 65.1.20.48/29 | 65.1.20.48 | 65.1.20.49 | 65.1.20.54 | 65.1.20.55 | 6 |
| 8 | 65.1.20.56/29 | 65.1.20.56 | 65.1.20.57 | 65.1.20.62 | 65.1.20.63 | 6 |
| 9 | 65.1.20.64/29 | 65.1.20.64 | 65.1.20.65 | 65.1.20.70 | 65.1.20.71 | 6 |
| 10 | 65.1.20.72/29 | 65.1.20.72 | 65.1.20.73 | 65.1.20.78 | 65.1.20.79 | 6 |
| 11 | 65.1.20.80/29 | 65.1.20.80 | 65.1.20.81 | 65.1.20.86 | 65.1.20.87 | 6 |
| 12 | 65.1.20.88/29 | 65.1.20.88 | 65.1.20.89 | 65.1.20.94 | 65.1.20.95 | 6 |
| 13 | 65.1.20.96/29 | 65.1.20.96 | 65.1.20.97 | 65.1.20.102 | 65.1.20.103 | 6 |
| 14 | 65.1.20.104/29 | 65.1.20.104 | 65.1.20.105 | 65.1.20.110 | 65.1.20.111 | 6 |
| 15 | 65.1.20.112/29 | 65.1.20.112 | 65.1.20.113 | 65.1.20.118 | 65.1.20.119 | 6 |
| 16 | 65.1.20.120/29 | 65.1.20.120 | 65.1.20.121 | 65.1.20.126 | 65.1.20.127 | 6 |
IP Address Sample
Showing first 16 of 128 total IPs.