10.0.0.0/8 IP Range
First and last address, mask and host count for 10.0.0.0/8.
The largest RFC 1918 private block, with over 16 million addresses.
| CIDR | 10.0.0.0/8 |
|---|---|
| Network address | 10.0.0.0 |
| Subnet mask | 255.0.0.0 |
| Wildcard mask | 0.255.255.255 |
| First usable IP | 10.0.0.1 |
| Last usable IP | 10.255.255.254 |
| Broadcast address | 10.255.255.255 |
| Total addresses | 16,777,216 |
| Usable hosts | 16,777,214 |
How it is used
Corporate networks and cloud private networks (VPC or VCN) commonly start from it and carve out smaller blocks such as a /16 per environment or a /24 per subnet. Allowing the whole /8 in a firewall rule is very broad; prefer the smallest block that covers your machines.
Allow this range in a firewall
sudo iptables -I INPUT 1 -p tcp -s 10.0.0.0/8 --dport 22 -j ACCEPT
This lets the whole range reach SSH. Change the port as needed, or build a complete rule set with the allow a port from specific IPs tool.
Calculate another range
Use the CIDR to IP range calculator for any other network.
FAQ
How many usable hosts are in 10.0.0.0/8?
16,777,214 usable addresses out of 16,777,216 total. The network and broadcast addresses are reserved.
How many /16 networks fit inside 10.0.0.0/8?
256 of them, from 10.0.0.0/16 to 10.255.0.0/16.
Is 10.0.0.0/8 a private range?
Yes. It belongs to the private address space defined in RFC 1918 and is not routed on the public internet.