# /19 Subnet Mask (255.255.224.0) – Hosts, Range & FAQ

> The /19 subnet mask is 255.255.224.0. A /19 block holds 8,192 addresses with 8,190 usable hosts — ranges, wildcard, binary math and FAQs.

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# /19 Subnet Mask ReferenceIPv4

Thirty-two /24s and 8,190 usable hosts: the /19 (mask 255.255.224.0) is the quiet favorite of designers carving a /16 into departmental chunks without fragmenting the summary.

The /19 subnet mask is 255.255.224.0, equivalent to 0.0.31.255 as a wildcard. A /19 block contains 8,192 IP addresses (8,190 usable hosts).

## /19 facts at a glance

- **Subnet mask:** 255.255.224.0
- **Wildcard mask:** 0.0.31.255
- **Binary mask:** 11111111.11111111.11100000.00000000
- **Total addresses:** 8,192
- **Usable hosts:** 8,190 (excludes network & broadcast)
- **Block size:** 8,192 addresses (213)
- **Typical role:** Mid-size networks and ISP allocations

## Example /19 networks

Three consecutive /19 blocks, starting at the /19 boundary that contains 198.51.100.0:

| Network | Usable range | Usable hosts |
| --- | --- | --- |
| 198.51.96.0/19 | 198.51.96.1 – 198.51.127.254 | 8,190 |
| 198.51.128.0/19 | 198.51.128.1 – 198.51.159.254 | 8,190 |
| 198.51.160.0/19 | 198.51.160.1 – 198.51.191.254 | 8,190 |

## How to calculate a /19 mask

A /19 mask sets the first 19 bits of a 32-bit number to 1 and leaves the remaining 13 bits as 0. In binary that reads `11111111.11111111.11100000.00000000`, which converts to dotted decimal `255.255.224.0`. Each block covers a contiguous run of 213 = 8,192 addresses, and every block starts at a multiple of that size. The wildcard simply flips every bit, giving `0.0.31.255`.

## Where /19 is used

- Department-level VLAN blocks inside a corporate /16.
- Master subnets for medium businesses planning years of growth.
- Public allocation slices that still aggregate cleanly upstream.

Example: 192.168.32.0/19 covers 192.168.32.0 through 192.168.63.255. The third octet moves in multiples of 32, so eight /19s tile a /16 exactly.

## Frequently asked questions

**What is the subnet mask for a /19?**

255.255.224.0, wildcard 0.0.31.255.

**How many hosts are in a /19?**

8,190 usable of 8,192 total.

**How many /19s are in a /16?**

Eight. Their third octets start at 0, 32, 64, 96, 128, 160, 192, and 224.

## Open this block in a calculator

[Open the /19 block in the subnet calculator](https://itinsighthub.com/subnet-calculator/?q=198.51.96.0%2F19)

[Get the /19 wildcard mask →](https://itinsighthub.com/wildcard-mask-calculator/?q=%2F19)

### Related prefixes

[/18](https://itinsighthub.com/subnet/18/)[/20](https://itinsighthub.com/subnet/20/)[/24](https://itinsighthub.com/subnet/24/)[/26](https://itinsighthub.com/subnet/26/)[/28](https://itinsighthub.com/subnet/28/)[/30](https://itinsighthub.com/subnet/30/)

← /18 subnet mask
/20 subnet mask →

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