192.0.0.0 Subnet Mask
192.0.0.0 is the subnet mask for a /2 network — 1,073,741,822 usable hosts out of 1,073,741,824 addresses.
CIDR Prefix
/2
Wildcard Mask
63.255.255.255
Total Addresses
1,073,741,824
Usable Hosts
1,073,741,822
Network Bits
2
Host Bits
30
192.0.0.0 in Binary
Each octet is eight bits. The highlighted bits are the 2 network bits; the rest are the 30 host bits that vary within the subnet.
192
0
0
0
Networks Using 192.0.0.0
| Network | Host Range | Broadcast |
|---|---|---|
| 0.0.0.0/2 | 0.0.0.1 – 63.255.255.254 | 63.255.255.255 |
| 128.0.0.0/2 | 128.0.0.1 – 191.255.255.254 | 191.255.255.255 |
| 192.0.0.0/2 | 192.0.0.1 – 255.255.255.254 | 255.255.255.255 |
Neighbouring Masks
Frequently Asked Questions
What CIDR prefix is 192.0.0.0?
192.0.0.0 is /2 in CIDR notation. The mask sets the first 2 of the 32 bits in an IPv4 address to 1, marking them as the network portion, and leaves the remaining 30 bits as 0 for hosts.
How many hosts does 192.0.0.0 allow?
A network with mask 192.0.0.0 holds 1,073,741,824 addresses, of which 1,073,741,822 are usable by hosts — the network address and the broadcast address are reserved.
What is the wildcard mask for 192.0.0.0?
The wildcard mask for 192.0.0.0 is 63.255.255.255. It is the bitwise inverse: every 1 in the subnet mask becomes a 0 and every 0 becomes a 1. Cisco access lists and OSPF network statements take the wildcard form rather than the subnet mask.
Standards
- RFC 950 — Internet Standard Subnetting Procedure
Defines the dotted-decimal subnet mask itself, and the rule that the network and broadcast addresses are not assignable to hosts.
- RFC 4632 — Classless Inter-Domain Routing (CIDR)
Establishes the /2 prefix notation that 192.0.0.0 is equivalent to, and requires masks to be contiguous — which is why exactly 33 of the 4.3 billion possible values are valid.