123.89.64.0/18
PublicClass A — /18 prefix — 16,382 usable hosts
Network address — the base address of the block (123.89.64.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 123.89.127.255 are delivered to every device in the subnet. Also reserved — not assignable.
Usable hosts — the 16,382 addresses between those two that you can assign to servers, VMs, or interfaces.
Subnet mask — 255.255.192.0 is the dotted-decimal equivalent of /18. Older tools and Cisco configs use this format instead of CIDR slash notation.
Full Details
| CIDR Notation | 123.89.64.0/18 |
| Network Address | 123.89.64.0 |
| Broadcast Address | 123.89.127.255 |
| Subnet Mask | 255.255.192.0 |
| Wildcard Mask | 0.0.63.255 |
| Prefix Length | /18 |
| IP Address Class | Class A |
| Total IP Addresses | 16,384 |
| Usable Host Addresses | 16,382 |
| First Usable IP | 123.89.64.1 |
| Last Usable IP | 123.89.127.254 |
| Network (Hex) | 0x7B594000 |
| Broadcast (Hex) | 0x7B597FFF |
| Address Type | Public / Globally Routable |
Binary Representation
The first 18 bits (1s in the mask) identify the network. The remaining 14 bits identify hosts within the network.
Split into Equal Subnets
Split 123.89.64.0/18 into 2 equal /19 subnets (8,190 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 123.89.64.0/19 | 123.89.64.0 | 123.89.64.1 | 123.89.95.254 | 123.89.95.255 | 8,190 |
| 2 | 123.89.96.0/19 | 123.89.96.0 | 123.89.96.1 | 123.89.127.254 | 123.89.127.255 | 8,190 |
Split 123.89.64.0/18 into 4 equal /20 subnets (4,094 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 123.89.64.0/20 | 123.89.64.0 | 123.89.64.1 | 123.89.79.254 | 123.89.79.255 | 4,094 |
| 2 | 123.89.80.0/20 | 123.89.80.0 | 123.89.80.1 | 123.89.95.254 | 123.89.95.255 | 4,094 |
| 3 | 123.89.96.0/20 | 123.89.96.0 | 123.89.96.1 | 123.89.111.254 | 123.89.111.255 | 4,094 |
| 4 | 123.89.112.0/20 | 123.89.112.0 | 123.89.112.1 | 123.89.127.254 | 123.89.127.255 | 4,094 |
Split 123.89.64.0/18 into 8 equal /21 subnets (2,046 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 123.89.64.0/21 | 123.89.64.0 | 123.89.64.1 | 123.89.71.254 | 123.89.71.255 | 2,046 |
| 2 | 123.89.72.0/21 | 123.89.72.0 | 123.89.72.1 | 123.89.79.254 | 123.89.79.255 | 2,046 |
| 3 | 123.89.80.0/21 | 123.89.80.0 | 123.89.80.1 | 123.89.87.254 | 123.89.87.255 | 2,046 |
| 4 | 123.89.88.0/21 | 123.89.88.0 | 123.89.88.1 | 123.89.95.254 | 123.89.95.255 | 2,046 |
| 5 | 123.89.96.0/21 | 123.89.96.0 | 123.89.96.1 | 123.89.103.254 | 123.89.103.255 | 2,046 |
| 6 | 123.89.104.0/21 | 123.89.104.0 | 123.89.104.1 | 123.89.111.254 | 123.89.111.255 | 2,046 |
| 7 | 123.89.112.0/21 | 123.89.112.0 | 123.89.112.1 | 123.89.119.254 | 123.89.119.255 | 2,046 |
| 8 | 123.89.120.0/21 | 123.89.120.0 | 123.89.120.1 | 123.89.127.254 | 123.89.127.255 | 2,046 |
Split 123.89.64.0/18 into 16 equal /22 subnets (1,022 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 123.89.64.0/22 | 123.89.64.0 | 123.89.64.1 | 123.89.67.254 | 123.89.67.255 | 1,022 |
| 2 | 123.89.68.0/22 | 123.89.68.0 | 123.89.68.1 | 123.89.71.254 | 123.89.71.255 | 1,022 |
| 3 | 123.89.72.0/22 | 123.89.72.0 | 123.89.72.1 | 123.89.75.254 | 123.89.75.255 | 1,022 |
| 4 | 123.89.76.0/22 | 123.89.76.0 | 123.89.76.1 | 123.89.79.254 | 123.89.79.255 | 1,022 |
| 5 | 123.89.80.0/22 | 123.89.80.0 | 123.89.80.1 | 123.89.83.254 | 123.89.83.255 | 1,022 |
| 6 | 123.89.84.0/22 | 123.89.84.0 | 123.89.84.1 | 123.89.87.254 | 123.89.87.255 | 1,022 |
| 7 | 123.89.88.0/22 | 123.89.88.0 | 123.89.88.1 | 123.89.91.254 | 123.89.91.255 | 1,022 |
| 8 | 123.89.92.0/22 | 123.89.92.0 | 123.89.92.1 | 123.89.95.254 | 123.89.95.255 | 1,022 |
| 9 | 123.89.96.0/22 | 123.89.96.0 | 123.89.96.1 | 123.89.99.254 | 123.89.99.255 | 1,022 |
| 10 | 123.89.100.0/22 | 123.89.100.0 | 123.89.100.1 | 123.89.103.254 | 123.89.103.255 | 1,022 |
| 11 | 123.89.104.0/22 | 123.89.104.0 | 123.89.104.1 | 123.89.107.254 | 123.89.107.255 | 1,022 |
| 12 | 123.89.108.0/22 | 123.89.108.0 | 123.89.108.1 | 123.89.111.254 | 123.89.111.255 | 1,022 |
| 13 | 123.89.112.0/22 | 123.89.112.0 | 123.89.112.1 | 123.89.115.254 | 123.89.115.255 | 1,022 |
| 14 | 123.89.116.0/22 | 123.89.116.0 | 123.89.116.1 | 123.89.119.254 | 123.89.119.255 | 1,022 |
| 15 | 123.89.120.0/22 | 123.89.120.0 | 123.89.120.1 | 123.89.123.254 | 123.89.123.255 | 1,022 |
| 16 | 123.89.124.0/22 | 123.89.124.0 | 123.89.124.1 | 123.89.127.254 | 123.89.127.255 | 1,022 |