A notable /15 is 198.18.0.0/15, reserved by RFC 2544 for benchmarking network equipment. If you see 198.18.x.x or 198.19.x.x addresses, you’re probably looking at a lab, a test tool, or a VPN or proxy app that uses the range for internal routing. Some Mac apps that create virtual network interfaces do exactly that.
Facts
- Prefix
- /15
- Subnet mask
- 255.254.0.0
- Wildcard mask
- 0.1.255.255
- Binary mask
- 11111111.11111110.00000000.00000000
- Total addresses
- 131,072
- Usable hosts
- 131,070
- Example range
- 10.0.0.0/15: 10.0.0.0 – 10.1.255.255
- Typical use
- Large blocks; 198.18.0.0/15 is reserved for network benchmarking.
Try it
Try: , ,
- CIDR block
- 10.0.0.0/15
- IP range
- 10.0.0.0 – 10.1.255.255
- Addresses
- 131,072
- Usable hosts
- 131,070
- Subnet mask
- 255.254.0.0
- Wildcard mask
- 0.1.255.255
Frequently asked questions
How many hosts are in a /15?
A /15 has 131,072 addresses. Subtracting the network and broadcast addresses leaves 131,070 usable hosts.
What is the subnet mask for /15?
/15 is 255.254.0.0 (wildcard mask 0.1.255.255). In binary that’s 15 ones followed by 17 zeros.