LoginSign Up

/19 Subnet Mask: 255.255.224.0

A /19 prefix fixes the first 19 bits of the address as the network, leaving 13 bits for hosts. That gives 8,192 addresses, of which 8,190 can be assigned to hosts.

CIDR notation/19
Subnet mask255.255.224.0
Wildcard mask0.0.31.255
Binary mask11111111.11111111.11100000.00000000
Hex mask0xFFFFE000
Total addresses8,192
Usable hosts8,190

Example: 172.16.0.0/19

  • Network address: 172.16.0.0
  • First usable host: 172.16.0.1
  • Last usable host: 172.16.31.254
  • Broadcast address: 172.16.31.255

When to use a /19 subnet

Entire VPCs or campus networks. /16 is the largest CIDR block AWS allows for a VPC.

  • 2,048 /19 subnets fit in a /8.
  • 8 /19 subnets fit in a /16.

Frequently Asked Questions

What is the subnet mask for /19?

The subnet mask for /19 is 255.255.224.0, and its wildcard (inverse) mask is 0.0.31.255.

How many hosts are in a /19?

A /19 contains 8,192 addresses. Subtracting the network and broadcast addresses leaves 8,190 usable hosts.