IPRangeExplorer

/10 vs /11 — Subnet Comparison

A /10 subnet is 2× larger than a /11. Every additional bit in the prefix halves the address space — the 1-bit difference between these two means /10 has 21 = 2 times as many addresses.

/10

4 million IPs — quarter of a /8

Full reference →
Total IPs 4,194,304
Usable Hosts 4,194,302
Subnet Mask 255.192.0.0
Wildcard Mask 0.63.255.255

Typical Uses

  • →Major regional segment in enterprise
  • →Large cloud region allocation
/11
Full reference →
Total IPs 2,097,152
Usable Hosts 2,097,150
Subnet Mask 255.224.0.0
Wildcard Mask 0.31.255.255

Key Differences

2×
more IPs in /10 than /11
2
/11 subnets fit inside one /10
1
bit of difference in prefix length

How 2 /11 Subnets Divide a /10

Example using 10.0.0.0/10 as the parent block.

# CIDR Network First Usable Last Usable Broadcast Hosts
1 10.0.0.0/11 10.0.0.0 10.0.0.1 10.31.255.254 10.31.255.255 2,097,150
2 10.32.0.0/11 10.32.0.0 10.32.0.1 10.63.255.254 10.63.255.255 2,097,150

FAQ

What is the difference between /10 and /11?

A /10 has 4,194,302 usable hosts and a /11 has 2,097,150. The subnet masks differ: /10 uses 255.192.0.0 while /11 uses 255.224.0.0. Every additional bit in the prefix halves the number of addresses — so the 1-bit gap means /10 is exactly 2× larger.

How many /11 subnets fit in a /10?

Exactly 2 /11 subnets fit perfectly inside one /10 with no wasted space. To split a /10 into /11s, just increment the last 1 bit of the network address for each new subnet.

Which should I choose?

Choose based on how many hosts you need. Use the hosts → prefix calculator on the homepage to find the right size for your requirements.