172.19.176.0/20
Private (RFC 1918) RFC 1918Class B — /20 prefix — 4,094 usable hosts
Network address — the base address of the block (172.19.176.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 172.19.191.255 are delivered to every device in the subnet. Also reserved — not assignable.
Usable hosts — the 4,094 addresses between those two that you can assign to servers, VMs, or interfaces.
Subnet mask — 255.255.240.0 is the dotted-decimal equivalent of /20. Older tools and Cisco configs use this format instead of CIDR slash notation.
Full Details
| CIDR Notation | 172.19.176.0/20 |
| Network Address | 172.19.176.0 |
| Broadcast Address | 172.19.191.255 |
| Subnet Mask | 255.255.240.0 |
| Wildcard Mask | 0.0.15.255 |
| Prefix Length | /20 |
| IP Address Class | Class B |
| Total IP Addresses | 4,096 |
| Usable Host Addresses | 4,094 |
| First Usable IP | 172.19.176.1 |
| Last Usable IP | 172.19.191.254 |
| Network (Hex) | 0xAC13B000 |
| Broadcast (Hex) | 0xAC13BFFF |
| Governing RFC | RFC 1918 |
| Address Type | Private (RFC 1918) |
Binary Representation
The first 20 bits (1s in the mask) identify the network. The remaining 12 bits identify hosts within the network.
Split into Equal Subnets
Split 172.19.176.0/20 into 2 equal /21 subnets (2,046 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 172.19.176.0/21 | 172.19.176.0 | 172.19.176.1 | 172.19.183.254 | 172.19.183.255 | 2,046 |
| 2 | 172.19.184.0/21 | 172.19.184.0 | 172.19.184.1 | 172.19.191.254 | 172.19.191.255 | 2,046 |
Split 172.19.176.0/20 into 4 equal /22 subnets (1,022 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 172.19.176.0/22 | 172.19.176.0 | 172.19.176.1 | 172.19.179.254 | 172.19.179.255 | 1,022 |
| 2 | 172.19.180.0/22 | 172.19.180.0 | 172.19.180.1 | 172.19.183.254 | 172.19.183.255 | 1,022 |
| 3 | 172.19.184.0/22 | 172.19.184.0 | 172.19.184.1 | 172.19.187.254 | 172.19.187.255 | 1,022 |
| 4 | 172.19.188.0/22 | 172.19.188.0 | 172.19.188.1 | 172.19.191.254 | 172.19.191.255 | 1,022 |
Split 172.19.176.0/20 into 8 equal /23 subnets (510 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 172.19.176.0/23 | 172.19.176.0 | 172.19.176.1 | 172.19.177.254 | 172.19.177.255 | 510 |
| 2 | 172.19.178.0/23 | 172.19.178.0 | 172.19.178.1 | 172.19.179.254 | 172.19.179.255 | 510 |
| 3 | 172.19.180.0/23 | 172.19.180.0 | 172.19.180.1 | 172.19.181.254 | 172.19.181.255 | 510 |
| 4 | 172.19.182.0/23 | 172.19.182.0 | 172.19.182.1 | 172.19.183.254 | 172.19.183.255 | 510 |
| 5 | 172.19.184.0/23 | 172.19.184.0 | 172.19.184.1 | 172.19.185.254 | 172.19.185.255 | 510 |
| 6 | 172.19.186.0/23 | 172.19.186.0 | 172.19.186.1 | 172.19.187.254 | 172.19.187.255 | 510 |
| 7 | 172.19.188.0/23 | 172.19.188.0 | 172.19.188.1 | 172.19.189.254 | 172.19.189.255 | 510 |
| 8 | 172.19.190.0/23 | 172.19.190.0 | 172.19.190.1 | 172.19.191.254 | 172.19.191.255 | 510 |
Split 172.19.176.0/20 into 16 equal /24 subnets (254 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 172.19.176.0/24 | 172.19.176.0 | 172.19.176.1 | 172.19.176.254 | 172.19.176.255 | 254 |
| 2 | 172.19.177.0/24 | 172.19.177.0 | 172.19.177.1 | 172.19.177.254 | 172.19.177.255 | 254 |
| 3 | 172.19.178.0/24 | 172.19.178.0 | 172.19.178.1 | 172.19.178.254 | 172.19.178.255 | 254 |
| 4 | 172.19.179.0/24 | 172.19.179.0 | 172.19.179.1 | 172.19.179.254 | 172.19.179.255 | 254 |
| 5 | 172.19.180.0/24 | 172.19.180.0 | 172.19.180.1 | 172.19.180.254 | 172.19.180.255 | 254 |
| 6 | 172.19.181.0/24 | 172.19.181.0 | 172.19.181.1 | 172.19.181.254 | 172.19.181.255 | 254 |
| 7 | 172.19.182.0/24 | 172.19.182.0 | 172.19.182.1 | 172.19.182.254 | 172.19.182.255 | 254 |
| 8 | 172.19.183.0/24 | 172.19.183.0 | 172.19.183.1 | 172.19.183.254 | 172.19.183.255 | 254 |
| 9 | 172.19.184.0/24 | 172.19.184.0 | 172.19.184.1 | 172.19.184.254 | 172.19.184.255 | 254 |
| 10 | 172.19.185.0/24 | 172.19.185.0 | 172.19.185.1 | 172.19.185.254 | 172.19.185.255 | 254 |
| 11 | 172.19.186.0/24 | 172.19.186.0 | 172.19.186.1 | 172.19.186.254 | 172.19.186.255 | 254 |
| 12 | 172.19.187.0/24 | 172.19.187.0 | 172.19.187.1 | 172.19.187.254 | 172.19.187.255 | 254 |
| 13 | 172.19.188.0/24 | 172.19.188.0 | 172.19.188.1 | 172.19.188.254 | 172.19.188.255 | 254 |
| 14 | 172.19.189.0/24 | 172.19.189.0 | 172.19.189.1 | 172.19.189.254 | 172.19.189.255 | 254 |
| 15 | 172.19.190.0/24 | 172.19.190.0 | 172.19.190.1 | 172.19.190.254 | 172.19.190.255 | 254 |
| 16 | 172.19.191.0/24 | 172.19.191.0 | 172.19.191.1 | 172.19.191.254 | 172.19.191.255 | 254 |