CIDR prefix
/2
192.0.0.0
1,073,741,822 usable hosts · 1,073,741,824 addresses
The mask for /2 is 192.0.0.0 — 1,073,741,824 addresses, 1,073,741,822 usable hosts. Huge blocks used only by registries and carriers.
Mask
192.0.0.0
Wildcard
63.255.255.255
Addresses
1,073,741,824
Hosts
1,073,741,822
Worked example: 10.0.0.0/2
Network address0.0.0.0/2
Broadcast address63.255.255.255
First host0.0.0.1
Last host63.255.255.254
FAQ — /2
What is the subnet mask for /2?
The subnet mask for /2 is 192.0.0.0 (wildcard: 63.255.255.255). The first 2 bits are the network part, the remaining 30 are the host part.
How many hosts fit in a /2?
A /2 block holds 1,073,741,824 addresses, of which 1,073,741,822 are usable hosts (the network and broadcast addresses are excluded).
What is a /2 used for?
Huge blocks used only by registries and carriers.