251.73.18.164/30
PublicClass E (Reserved) — /30 prefix — 2 usable hosts
Network Address
251.73.18.164
Broadcast Address
251.73.18.167
Subnet Mask
255.255.255.252
Usable Hosts
2
First Usable IP
251.73.18.165
Last Usable IP
251.73.18.166
Total IPs
4
Prefix Length
Network address — the base address of the block (251.73.18.164). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 251.73.18.167 are delivered to every device in the subnet. Also reserved — not assignable.
Usable hosts — the 2 addresses between those two that you can assign to servers, VMs, or interfaces.
Subnet mask — 255.255.255.252 is the dotted-decimal equivalent of /30. Older tools and Cisco configs use this format instead of CIDR slash notation.
Full Details
| CIDR Notation | 251.73.18.164/30 |
| Network Address | 251.73.18.164 |
| Broadcast Address | 251.73.18.167 |
| Subnet Mask | 255.255.255.252 |
| Wildcard Mask | 0.0.0.3 |
| Prefix Length | /30 |
| IP Address Class | Class E (Reserved) |
| Total IP Addresses | 4 |
| Usable Host Addresses | 2 |
| First Usable IP | 251.73.18.165 |
| Last Usable IP | 251.73.18.166 |
| Network (Hex) | 0xFB4912A4 |
| Broadcast (Hex) | 0xFB4912A7 |
| Address Type | Public / Globally Routable |
Binary Representation
Network Address
11111011.01001001.00010010
11111011.01001001.00010010.10100100
Subnet Mask
11111111.11111111.11111111.11111100
The first 30 bits (1s in the mask) identify the network. The remaining 2 bits identify hosts within the network.
All 4 IP Addresses in this Range
251.73.18.164
net
251.73.18.165
251.73.18.166
251.73.18.167
bcast
/30 Subnet Reference
Total IPs
4
Usable Hosts
2
Subnet Mask
255.255.255.252
Wildcard
0.0.0.3