19.16.128.0/17
PublicClass A — /17 prefix — 32,766 usable hosts
Network address — the base address of the block (19.16.128.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 19.16.255.255 are delivered to every device in the subnet. Also reserved — not assignable.
Usable hosts — the 32,766 addresses between those two that you can assign to servers, VMs, or interfaces.
Subnet mask — 255.255.128.0 is the dotted-decimal equivalent of /17. Older tools and Cisco configs use this format instead of CIDR slash notation.
Full Details
| CIDR Notation | 19.16.128.0/17 |
| Network Address | 19.16.128.0 |
| Broadcast Address | 19.16.255.255 |
| Subnet Mask | 255.255.128.0 |
| Wildcard Mask | 0.0.127.255 |
| Prefix Length | /17 |
| IP Address Class | Class A |
| Total IP Addresses | 32,768 |
| Usable Host Addresses | 32,766 |
| First Usable IP | 19.16.128.1 |
| Last Usable IP | 19.16.255.254 |
| Network (Hex) | 0x13108000 |
| Broadcast (Hex) | 0x1310FFFF |
| Address Type | Public / Globally Routable |
Binary Representation
The first 17 bits (1s in the mask) identify the network. The remaining 15 bits identify hosts within the network.
Split into Equal Subnets
Split 19.16.128.0/17 into 2 equal /18 subnets (16,382 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 19.16.128.0/18 | 19.16.128.0 | 19.16.128.1 | 19.16.191.254 | 19.16.191.255 | 16,382 |
| 2 | 19.16.192.0/18 | 19.16.192.0 | 19.16.192.1 | 19.16.255.254 | 19.16.255.255 | 16,382 |
Split 19.16.128.0/17 into 4 equal /19 subnets (8,190 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 19.16.128.0/19 | 19.16.128.0 | 19.16.128.1 | 19.16.159.254 | 19.16.159.255 | 8,190 |
| 2 | 19.16.160.0/19 | 19.16.160.0 | 19.16.160.1 | 19.16.191.254 | 19.16.191.255 | 8,190 |
| 3 | 19.16.192.0/19 | 19.16.192.0 | 19.16.192.1 | 19.16.223.254 | 19.16.223.255 | 8,190 |
| 4 | 19.16.224.0/19 | 19.16.224.0 | 19.16.224.1 | 19.16.255.254 | 19.16.255.255 | 8,190 |
Split 19.16.128.0/17 into 8 equal /20 subnets (4,094 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 19.16.128.0/20 | 19.16.128.0 | 19.16.128.1 | 19.16.143.254 | 19.16.143.255 | 4,094 |
| 2 | 19.16.144.0/20 | 19.16.144.0 | 19.16.144.1 | 19.16.159.254 | 19.16.159.255 | 4,094 |
| 3 | 19.16.160.0/20 | 19.16.160.0 | 19.16.160.1 | 19.16.175.254 | 19.16.175.255 | 4,094 |
| 4 | 19.16.176.0/20 | 19.16.176.0 | 19.16.176.1 | 19.16.191.254 | 19.16.191.255 | 4,094 |
| 5 | 19.16.192.0/20 | 19.16.192.0 | 19.16.192.1 | 19.16.207.254 | 19.16.207.255 | 4,094 |
| 6 | 19.16.208.0/20 | 19.16.208.0 | 19.16.208.1 | 19.16.223.254 | 19.16.223.255 | 4,094 |
| 7 | 19.16.224.0/20 | 19.16.224.0 | 19.16.224.1 | 19.16.239.254 | 19.16.239.255 | 4,094 |
| 8 | 19.16.240.0/20 | 19.16.240.0 | 19.16.240.1 | 19.16.255.254 | 19.16.255.255 | 4,094 |
Split 19.16.128.0/17 into 16 equal /21 subnets (2,046 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 19.16.128.0/21 | 19.16.128.0 | 19.16.128.1 | 19.16.135.254 | 19.16.135.255 | 2,046 |
| 2 | 19.16.136.0/21 | 19.16.136.0 | 19.16.136.1 | 19.16.143.254 | 19.16.143.255 | 2,046 |
| 3 | 19.16.144.0/21 | 19.16.144.0 | 19.16.144.1 | 19.16.151.254 | 19.16.151.255 | 2,046 |
| 4 | 19.16.152.0/21 | 19.16.152.0 | 19.16.152.1 | 19.16.159.254 | 19.16.159.255 | 2,046 |
| 5 | 19.16.160.0/21 | 19.16.160.0 | 19.16.160.1 | 19.16.167.254 | 19.16.167.255 | 2,046 |
| 6 | 19.16.168.0/21 | 19.16.168.0 | 19.16.168.1 | 19.16.175.254 | 19.16.175.255 | 2,046 |
| 7 | 19.16.176.0/21 | 19.16.176.0 | 19.16.176.1 | 19.16.183.254 | 19.16.183.255 | 2,046 |
| 8 | 19.16.184.0/21 | 19.16.184.0 | 19.16.184.1 | 19.16.191.254 | 19.16.191.255 | 2,046 |
| 9 | 19.16.192.0/21 | 19.16.192.0 | 19.16.192.1 | 19.16.199.254 | 19.16.199.255 | 2,046 |
| 10 | 19.16.200.0/21 | 19.16.200.0 | 19.16.200.1 | 19.16.207.254 | 19.16.207.255 | 2,046 |
| 11 | 19.16.208.0/21 | 19.16.208.0 | 19.16.208.1 | 19.16.215.254 | 19.16.215.255 | 2,046 |
| 12 | 19.16.216.0/21 | 19.16.216.0 | 19.16.216.1 | 19.16.223.254 | 19.16.223.255 | 2,046 |
| 13 | 19.16.224.0/21 | 19.16.224.0 | 19.16.224.1 | 19.16.231.254 | 19.16.231.255 | 2,046 |
| 14 | 19.16.232.0/21 | 19.16.232.0 | 19.16.232.1 | 19.16.239.254 | 19.16.239.255 | 2,046 |
| 15 | 19.16.240.0/21 | 19.16.240.0 | 19.16.240.1 | 19.16.247.254 | 19.16.247.255 | 2,046 |
| 16 | 19.16.248.0/21 | 19.16.248.0 | 19.16.248.1 | 19.16.255.254 | 19.16.255.255 | 2,046 |