30.8.128.0/19
PublicClass A — /19 prefix — 8,190 usable hosts
Network address — the base address of the block (30.8.128.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 30.8.159.255 are delivered to every device in the subnet. Also reserved — not assignable.
Usable hosts — the 8,190 addresses between those two that you can assign to servers, VMs, or interfaces.
Subnet mask — 255.255.224.0 is the dotted-decimal equivalent of /19. Older tools and Cisco configs use this format instead of CIDR slash notation.
Full Details
| CIDR Notation | 30.8.128.0/19 |
| Network Address | 30.8.128.0 |
| Broadcast Address | 30.8.159.255 |
| Subnet Mask | 255.255.224.0 |
| Wildcard Mask | 0.0.31.255 |
| Prefix Length | /19 |
| IP Address Class | Class A |
| Total IP Addresses | 8,192 |
| Usable Host Addresses | 8,190 |
| First Usable IP | 30.8.128.1 |
| Last Usable IP | 30.8.159.254 |
| Network (Hex) | 0x1E088000 |
| Broadcast (Hex) | 0x1E089FFF |
| Address Type | Public / Globally Routable |
Binary Representation
The first 19 bits (1s in the mask) identify the network. The remaining 13 bits identify hosts within the network.
Split into Equal Subnets
Split 30.8.128.0/19 into 2 equal /20 subnets (4,094 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 30.8.128.0/20 | 30.8.128.0 | 30.8.128.1 | 30.8.143.254 | 30.8.143.255 | 4,094 |
| 2 | 30.8.144.0/20 | 30.8.144.0 | 30.8.144.1 | 30.8.159.254 | 30.8.159.255 | 4,094 |
Split 30.8.128.0/19 into 4 equal /21 subnets (2,046 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 30.8.128.0/21 | 30.8.128.0 | 30.8.128.1 | 30.8.135.254 | 30.8.135.255 | 2,046 |
| 2 | 30.8.136.0/21 | 30.8.136.0 | 30.8.136.1 | 30.8.143.254 | 30.8.143.255 | 2,046 |
| 3 | 30.8.144.0/21 | 30.8.144.0 | 30.8.144.1 | 30.8.151.254 | 30.8.151.255 | 2,046 |
| 4 | 30.8.152.0/21 | 30.8.152.0 | 30.8.152.1 | 30.8.159.254 | 30.8.159.255 | 2,046 |
Split 30.8.128.0/19 into 8 equal /22 subnets (1,022 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 30.8.128.0/22 | 30.8.128.0 | 30.8.128.1 | 30.8.131.254 | 30.8.131.255 | 1,022 |
| 2 | 30.8.132.0/22 | 30.8.132.0 | 30.8.132.1 | 30.8.135.254 | 30.8.135.255 | 1,022 |
| 3 | 30.8.136.0/22 | 30.8.136.0 | 30.8.136.1 | 30.8.139.254 | 30.8.139.255 | 1,022 |
| 4 | 30.8.140.0/22 | 30.8.140.0 | 30.8.140.1 | 30.8.143.254 | 30.8.143.255 | 1,022 |
| 5 | 30.8.144.0/22 | 30.8.144.0 | 30.8.144.1 | 30.8.147.254 | 30.8.147.255 | 1,022 |
| 6 | 30.8.148.0/22 | 30.8.148.0 | 30.8.148.1 | 30.8.151.254 | 30.8.151.255 | 1,022 |
| 7 | 30.8.152.0/22 | 30.8.152.0 | 30.8.152.1 | 30.8.155.254 | 30.8.155.255 | 1,022 |
| 8 | 30.8.156.0/22 | 30.8.156.0 | 30.8.156.1 | 30.8.159.254 | 30.8.159.255 | 1,022 |
Split 30.8.128.0/19 into 16 equal /23 subnets (510 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 30.8.128.0/23 | 30.8.128.0 | 30.8.128.1 | 30.8.129.254 | 30.8.129.255 | 510 |
| 2 | 30.8.130.0/23 | 30.8.130.0 | 30.8.130.1 | 30.8.131.254 | 30.8.131.255 | 510 |
| 3 | 30.8.132.0/23 | 30.8.132.0 | 30.8.132.1 | 30.8.133.254 | 30.8.133.255 | 510 |
| 4 | 30.8.134.0/23 | 30.8.134.0 | 30.8.134.1 | 30.8.135.254 | 30.8.135.255 | 510 |
| 5 | 30.8.136.0/23 | 30.8.136.0 | 30.8.136.1 | 30.8.137.254 | 30.8.137.255 | 510 |
| 6 | 30.8.138.0/23 | 30.8.138.0 | 30.8.138.1 | 30.8.139.254 | 30.8.139.255 | 510 |
| 7 | 30.8.140.0/23 | 30.8.140.0 | 30.8.140.1 | 30.8.141.254 | 30.8.141.255 | 510 |
| 8 | 30.8.142.0/23 | 30.8.142.0 | 30.8.142.1 | 30.8.143.254 | 30.8.143.255 | 510 |
| 9 | 30.8.144.0/23 | 30.8.144.0 | 30.8.144.1 | 30.8.145.254 | 30.8.145.255 | 510 |
| 10 | 30.8.146.0/23 | 30.8.146.0 | 30.8.146.1 | 30.8.147.254 | 30.8.147.255 | 510 |
| 11 | 30.8.148.0/23 | 30.8.148.0 | 30.8.148.1 | 30.8.149.254 | 30.8.149.255 | 510 |
| 12 | 30.8.150.0/23 | 30.8.150.0 | 30.8.150.1 | 30.8.151.254 | 30.8.151.255 | 510 |
| 13 | 30.8.152.0/23 | 30.8.152.0 | 30.8.152.1 | 30.8.153.254 | 30.8.153.255 | 510 |
| 14 | 30.8.154.0/23 | 30.8.154.0 | 30.8.154.1 | 30.8.155.254 | 30.8.155.255 | 510 |
| 15 | 30.8.156.0/23 | 30.8.156.0 | 30.8.156.1 | 30.8.157.254 | 30.8.157.255 | 510 |
| 16 | 30.8.158.0/23 | 30.8.158.0 | 30.8.158.1 | 30.8.159.254 | 30.8.159.255 | 510 |