121.2.251.128/27
PublicClass A — /27 prefix — 30 usable hosts
Network address — the base address of the block (121.2.251.128). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 121.2.251.159 are delivered to every device in the subnet. Also reserved — not assignable.
Usable hosts — the 30 addresses between those two that you can assign to servers, VMs, or interfaces.
Subnet mask — 255.255.255.224 is the dotted-decimal equivalent of /27. Older tools and Cisco configs use this format instead of CIDR slash notation.
Full Details
| CIDR Notation | 121.2.251.128/27 |
| Network Address | 121.2.251.128 |
| Broadcast Address | 121.2.251.159 |
| Subnet Mask | 255.255.255.224 |
| Wildcard Mask | 0.0.0.31 |
| Prefix Length | /27 |
| IP Address Class | Class A |
| Total IP Addresses | 32 |
| Usable Host Addresses | 30 |
| First Usable IP | 121.2.251.129 |
| Last Usable IP | 121.2.251.158 |
| Network (Hex) | 0x7902FB80 |
| Broadcast (Hex) | 0x7902FB9F |
| Address Type | Public / Globally Routable |
Binary Representation
The first 27 bits (1s in the mask) identify the network. The remaining 5 bits identify hosts within the network.
Split into Equal Subnets
Split 121.2.251.128/27 into 2 equal /28 subnets (14 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 121.2.251.128/28 | 121.2.251.128 | 121.2.251.129 | 121.2.251.142 | 121.2.251.143 | 14 |
| 2 | 121.2.251.144/28 | 121.2.251.144 | 121.2.251.145 | 121.2.251.158 | 121.2.251.159 | 14 |
Split 121.2.251.128/27 into 4 equal /29 subnets (6 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 121.2.251.128/29 | 121.2.251.128 | 121.2.251.129 | 121.2.251.134 | 121.2.251.135 | 6 |
| 2 | 121.2.251.136/29 | 121.2.251.136 | 121.2.251.137 | 121.2.251.142 | 121.2.251.143 | 6 |
| 3 | 121.2.251.144/29 | 121.2.251.144 | 121.2.251.145 | 121.2.251.150 | 121.2.251.151 | 6 |
| 4 | 121.2.251.152/29 | 121.2.251.152 | 121.2.251.153 | 121.2.251.158 | 121.2.251.159 | 6 |
Split 121.2.251.128/27 into 8 equal /30 subnets (2 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 121.2.251.128/30 | 121.2.251.128 | 121.2.251.129 | 121.2.251.130 | 121.2.251.131 | 2 |
| 2 | 121.2.251.132/30 | 121.2.251.132 | 121.2.251.133 | 121.2.251.134 | 121.2.251.135 | 2 |
| 3 | 121.2.251.136/30 | 121.2.251.136 | 121.2.251.137 | 121.2.251.138 | 121.2.251.139 | 2 |
| 4 | 121.2.251.140/30 | 121.2.251.140 | 121.2.251.141 | 121.2.251.142 | 121.2.251.143 | 2 |
| 5 | 121.2.251.144/30 | 121.2.251.144 | 121.2.251.145 | 121.2.251.146 | 121.2.251.147 | 2 |
| 6 | 121.2.251.148/30 | 121.2.251.148 | 121.2.251.149 | 121.2.251.150 | 121.2.251.151 | 2 |
| 7 | 121.2.251.152/30 | 121.2.251.152 | 121.2.251.153 | 121.2.251.154 | 121.2.251.155 | 2 |
| 8 | 121.2.251.156/30 | 121.2.251.156 | 121.2.251.157 | 121.2.251.158 | 121.2.251.159 | 2 |
IP Address Sample
Showing first 16 of 32 total IPs.