/30 Subnet
Subnet Mask
255.255.255.252
Wildcard Mask
0.0.0.3
Total IPs
4
Usable Hosts
2
Network Bits
30
Host Bits
2
About /30 Networks
Point-to-point link — connects two routers or devices (2 hosts). A /30 subnet uses the mask 255.255.255.252 and provides 2 usable host addresses out of 4 total IPs.
Example /30 Networks
| Network | Broadcast | First Host | Last Host |
|---|---|---|---|
| 10.0.0.0/30 | 10.0.0.3 | 10.0.0.1 | 10.0.0.2 |
| 172.16.0.0/30 | 172.16.0.3 | 172.16.0.1 | 172.16.0.2 |
| 192.168.0.0/30 | 192.168.0.3 | 192.168.0.1 | 192.168.0.2 |
| 192.168.1.0/30 | 192.168.1.3 | 192.168.1.1 | 192.168.1.2 |
| 8.8.8.0/30 | 8.8.8.3 | 8.8.8.1 | 8.8.8.2 |
Adjacent CIDRs
Frequently Asked Questions
What is a /30 subnet?
A /30 subnet uses the subnet mask 255.255.255.252 with 2 usable host addresses and 4 total IP addresses. It has 30 network bits and 2 host bits.
How many hosts in a /30 network?
A /30 network supports 2 usable hosts out of 4 total IP addresses. The usable range excludes the network address and broadcast address.
What subnet mask does /30 use?
A /30 subnet uses the mask 255.255.255.252 (wildcard mask 0.0.0.3). This means the first 30 bits identify the network and the remaining 2 bits identify hosts.