1.89.18.0/25
PublicClass A — /25 prefix — 126 usable hosts
Network address — the base address of the block (1.89.18.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 1.89.18.127 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 | 1.89.18.0/25 |
| Network Address | 1.89.18.0 |
| Broadcast Address | 1.89.18.127 |
| 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 | 1.89.18.1 |
| Last Usable IP | 1.89.18.126 |
| Network (Hex) | 0x01591200 |
| Broadcast (Hex) | 0x0159127F |
| 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 1.89.18.0/25 into 2 equal /26 subnets (62 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 1.89.18.0/26 | 1.89.18.0 | 1.89.18.1 | 1.89.18.62 | 1.89.18.63 | 62 |
| 2 | 1.89.18.64/26 | 1.89.18.64 | 1.89.18.65 | 1.89.18.126 | 1.89.18.127 | 62 |
Split 1.89.18.0/25 into 4 equal /27 subnets (30 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 1.89.18.0/27 | 1.89.18.0 | 1.89.18.1 | 1.89.18.30 | 1.89.18.31 | 30 |
| 2 | 1.89.18.32/27 | 1.89.18.32 | 1.89.18.33 | 1.89.18.62 | 1.89.18.63 | 30 |
| 3 | 1.89.18.64/27 | 1.89.18.64 | 1.89.18.65 | 1.89.18.94 | 1.89.18.95 | 30 |
| 4 | 1.89.18.96/27 | 1.89.18.96 | 1.89.18.97 | 1.89.18.126 | 1.89.18.127 | 30 |
Split 1.89.18.0/25 into 8 equal /28 subnets (14 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 1.89.18.0/28 | 1.89.18.0 | 1.89.18.1 | 1.89.18.14 | 1.89.18.15 | 14 |
| 2 | 1.89.18.16/28 | 1.89.18.16 | 1.89.18.17 | 1.89.18.30 | 1.89.18.31 | 14 |
| 3 | 1.89.18.32/28 | 1.89.18.32 | 1.89.18.33 | 1.89.18.46 | 1.89.18.47 | 14 |
| 4 | 1.89.18.48/28 | 1.89.18.48 | 1.89.18.49 | 1.89.18.62 | 1.89.18.63 | 14 |
| 5 | 1.89.18.64/28 | 1.89.18.64 | 1.89.18.65 | 1.89.18.78 | 1.89.18.79 | 14 |
| 6 | 1.89.18.80/28 | 1.89.18.80 | 1.89.18.81 | 1.89.18.94 | 1.89.18.95 | 14 |
| 7 | 1.89.18.96/28 | 1.89.18.96 | 1.89.18.97 | 1.89.18.110 | 1.89.18.111 | 14 |
| 8 | 1.89.18.112/28 | 1.89.18.112 | 1.89.18.113 | 1.89.18.126 | 1.89.18.127 | 14 |
Split 1.89.18.0/25 into 16 equal /29 subnets (6 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 1.89.18.0/29 | 1.89.18.0 | 1.89.18.1 | 1.89.18.6 | 1.89.18.7 | 6 |
| 2 | 1.89.18.8/29 | 1.89.18.8 | 1.89.18.9 | 1.89.18.14 | 1.89.18.15 | 6 |
| 3 | 1.89.18.16/29 | 1.89.18.16 | 1.89.18.17 | 1.89.18.22 | 1.89.18.23 | 6 |
| 4 | 1.89.18.24/29 | 1.89.18.24 | 1.89.18.25 | 1.89.18.30 | 1.89.18.31 | 6 |
| 5 | 1.89.18.32/29 | 1.89.18.32 | 1.89.18.33 | 1.89.18.38 | 1.89.18.39 | 6 |
| 6 | 1.89.18.40/29 | 1.89.18.40 | 1.89.18.41 | 1.89.18.46 | 1.89.18.47 | 6 |
| 7 | 1.89.18.48/29 | 1.89.18.48 | 1.89.18.49 | 1.89.18.54 | 1.89.18.55 | 6 |
| 8 | 1.89.18.56/29 | 1.89.18.56 | 1.89.18.57 | 1.89.18.62 | 1.89.18.63 | 6 |
| 9 | 1.89.18.64/29 | 1.89.18.64 | 1.89.18.65 | 1.89.18.70 | 1.89.18.71 | 6 |
| 10 | 1.89.18.72/29 | 1.89.18.72 | 1.89.18.73 | 1.89.18.78 | 1.89.18.79 | 6 |
| 11 | 1.89.18.80/29 | 1.89.18.80 | 1.89.18.81 | 1.89.18.86 | 1.89.18.87 | 6 |
| 12 | 1.89.18.88/29 | 1.89.18.88 | 1.89.18.89 | 1.89.18.94 | 1.89.18.95 | 6 |
| 13 | 1.89.18.96/29 | 1.89.18.96 | 1.89.18.97 | 1.89.18.102 | 1.89.18.103 | 6 |
| 14 | 1.89.18.104/29 | 1.89.18.104 | 1.89.18.105 | 1.89.18.110 | 1.89.18.111 | 6 |
| 15 | 1.89.18.112/29 | 1.89.18.112 | 1.89.18.113 | 1.89.18.118 | 1.89.18.119 | 6 |
| 16 | 1.89.18.120/29 | 1.89.18.120 | 1.89.18.121 | 1.89.18.126 | 1.89.18.127 | 6 |
IP Address Sample
Showing first 16 of 128 total IPs.