166.75.128.0/18
PublicClass B — /18 prefix — 16,382 usable hosts
Network address — the base address of the block (166.75.128.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 166.75.191.255 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 | 166.75.128.0/18 |
| Network Address | 166.75.128.0 |
| Broadcast Address | 166.75.191.255 |
| Subnet Mask | 255.255.192.0 |
| Wildcard Mask | 0.0.63.255 |
| Prefix Length | /18 |
| IP Address Class | Class B |
| Total IP Addresses | 16,384 |
| Usable Host Addresses | 16,382 |
| First Usable IP | 166.75.128.1 |
| Last Usable IP | 166.75.191.254 |
| Network (Hex) | 0xA64B8000 |
| Broadcast (Hex) | 0xA64BBFFF |
| 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 166.75.128.0/18 into 2 equal /19 subnets (8,190 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 166.75.128.0/19 | 166.75.128.0 | 166.75.128.1 | 166.75.159.254 | 166.75.159.255 | 8,190 |
| 2 | 166.75.160.0/19 | 166.75.160.0 | 166.75.160.1 | 166.75.191.254 | 166.75.191.255 | 8,190 |
Split 166.75.128.0/18 into 4 equal /20 subnets (4,094 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 166.75.128.0/20 | 166.75.128.0 | 166.75.128.1 | 166.75.143.254 | 166.75.143.255 | 4,094 |
| 2 | 166.75.144.0/20 | 166.75.144.0 | 166.75.144.1 | 166.75.159.254 | 166.75.159.255 | 4,094 |
| 3 | 166.75.160.0/20 | 166.75.160.0 | 166.75.160.1 | 166.75.175.254 | 166.75.175.255 | 4,094 |
| 4 | 166.75.176.0/20 | 166.75.176.0 | 166.75.176.1 | 166.75.191.254 | 166.75.191.255 | 4,094 |
Split 166.75.128.0/18 into 8 equal /21 subnets (2,046 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 166.75.128.0/21 | 166.75.128.0 | 166.75.128.1 | 166.75.135.254 | 166.75.135.255 | 2,046 |
| 2 | 166.75.136.0/21 | 166.75.136.0 | 166.75.136.1 | 166.75.143.254 | 166.75.143.255 | 2,046 |
| 3 | 166.75.144.0/21 | 166.75.144.0 | 166.75.144.1 | 166.75.151.254 | 166.75.151.255 | 2,046 |
| 4 | 166.75.152.0/21 | 166.75.152.0 | 166.75.152.1 | 166.75.159.254 | 166.75.159.255 | 2,046 |
| 5 | 166.75.160.0/21 | 166.75.160.0 | 166.75.160.1 | 166.75.167.254 | 166.75.167.255 | 2,046 |
| 6 | 166.75.168.0/21 | 166.75.168.0 | 166.75.168.1 | 166.75.175.254 | 166.75.175.255 | 2,046 |
| 7 | 166.75.176.0/21 | 166.75.176.0 | 166.75.176.1 | 166.75.183.254 | 166.75.183.255 | 2,046 |
| 8 | 166.75.184.0/21 | 166.75.184.0 | 166.75.184.1 | 166.75.191.254 | 166.75.191.255 | 2,046 |
Split 166.75.128.0/18 into 16 equal /22 subnets (1,022 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 166.75.128.0/22 | 166.75.128.0 | 166.75.128.1 | 166.75.131.254 | 166.75.131.255 | 1,022 |
| 2 | 166.75.132.0/22 | 166.75.132.0 | 166.75.132.1 | 166.75.135.254 | 166.75.135.255 | 1,022 |
| 3 | 166.75.136.0/22 | 166.75.136.0 | 166.75.136.1 | 166.75.139.254 | 166.75.139.255 | 1,022 |
| 4 | 166.75.140.0/22 | 166.75.140.0 | 166.75.140.1 | 166.75.143.254 | 166.75.143.255 | 1,022 |
| 5 | 166.75.144.0/22 | 166.75.144.0 | 166.75.144.1 | 166.75.147.254 | 166.75.147.255 | 1,022 |
| 6 | 166.75.148.0/22 | 166.75.148.0 | 166.75.148.1 | 166.75.151.254 | 166.75.151.255 | 1,022 |
| 7 | 166.75.152.0/22 | 166.75.152.0 | 166.75.152.1 | 166.75.155.254 | 166.75.155.255 | 1,022 |
| 8 | 166.75.156.0/22 | 166.75.156.0 | 166.75.156.1 | 166.75.159.254 | 166.75.159.255 | 1,022 |
| 9 | 166.75.160.0/22 | 166.75.160.0 | 166.75.160.1 | 166.75.163.254 | 166.75.163.255 | 1,022 |
| 10 | 166.75.164.0/22 | 166.75.164.0 | 166.75.164.1 | 166.75.167.254 | 166.75.167.255 | 1,022 |
| 11 | 166.75.168.0/22 | 166.75.168.0 | 166.75.168.1 | 166.75.171.254 | 166.75.171.255 | 1,022 |
| 12 | 166.75.172.0/22 | 166.75.172.0 | 166.75.172.1 | 166.75.175.254 | 166.75.175.255 | 1,022 |
| 13 | 166.75.176.0/22 | 166.75.176.0 | 166.75.176.1 | 166.75.179.254 | 166.75.179.255 | 1,022 |
| 14 | 166.75.180.0/22 | 166.75.180.0 | 166.75.180.1 | 166.75.183.254 | 166.75.183.255 | 1,022 |
| 15 | 166.75.184.0/22 | 166.75.184.0 | 166.75.184.1 | 166.75.187.254 | 166.75.187.255 | 1,022 |
| 16 | 166.75.188.0/22 | 166.75.188.0 | 166.75.188.1 | 166.75.191.254 | 166.75.191.255 | 1,022 |