/19 Subnet Mask (255.255.224.0)
| Prefix | /19 |
|---|---|
| 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 |
| Host bits | 13 |
| Subnets of /19 in a /16 | 8 |
e.g. 10.0.0.5/22 or 10.0.0.5 255.255.252.0
| Network address | 172.16.0.0 | |
|---|---|---|
| Broadcast address | 172.16.31.255 | |
| First usable host | 172.16.0.1 | |
| Last usable host | 172.16.31.254 | |
| Total addresses | 8,192 | |
| Usable hosts | 8,190 | |
| Subnet mask | 255.255.224.0 | |
| Wildcard mask | 0.0.31.255 | |
| CIDR notation | 172.16.0.0/19 | |
| IP class | Class B (legacy) | |
| Address type | Private (RFC 1918) | |
| IP address (binary) | 10101100.00010000.00000000.00000000 | |
| Subnet mask (binary) | 11111111.11111111.11100000.00000000 |
■ network bits ■ host bits
| Requested hosts | CIDR | First host | Last host | Broadcast | Usable hosts |
|---|
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What is a /19 subnet?
A /19 subnet uses the first 19 bits of an IPv4 address for the network and leaves 13 bits for hosts. Its subnet mask is 255.255.224.0, and it contains 2¹³ = 8,192 addresses, of which 8,190 can be assigned to devices. Typical use: Eight /22s or 32 /24s; used for large data center segments or per-availability-zone blocks in a VPC. Use the subnet calculator above to check any /19 network.
/19 subnet example
For 172.16.0.0/19: network address 172.16.0.0, usable hosts 172.16.0.1 – 172.16.31.254, broadcast address 172.16.31.255, wildcard mask 0.0.31.255.
/19 networks in 172.16.0.0/16
A /16 holds 8 /19 networks:
- 172.16.0.0/19
- 172.16.32.0/19
- 172.16.64.0/19
- 172.16.96.0/19
- 172.16.128.0/19
- 172.16.160.0/19
- 172.16.192.0/19
- 172.16.224.0/19
Frequently asked questions
How many usable IPs are in a /19?
8,190. The block has 8,192 addresses; the first is the network address and the last is the broadcast address.
What is the subnet mask for /19?
255.255.224.0, or 11111111.11111111.11100000.00000000 in binary.
How many /19 subnets are in a /16?
8 (2³), because a /19 uses 3 more network bits than a /16.
What is the difference between /19 and /18?
A /18 (255.255.192.0) is twice as large: 16,384 addresses and 16,382 usable hosts, spanning two consecutive /19 blocks such as 172.16.0.0–172.16.63.255.