121.5.40.0/24
PublicClass A — /24 prefix — 254 usable hosts
Network address — the base address of the block (121.5.40.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 121.5.40.255 are delivered to every device in the subnet. Also reserved — not assignable.
Usable hosts — the 254 addresses between those two that you can assign to servers, VMs, or interfaces.
Subnet mask — 255.255.255.0 is the dotted-decimal equivalent of /24. Older tools and Cisco configs use this format instead of CIDR slash notation.
Full Details
| CIDR Notation | 121.5.40.0/24 |
| Network Address | 121.5.40.0 |
| Broadcast Address | 121.5.40.255 |
| Subnet Mask | 255.255.255.0 |
| Wildcard Mask | 0.0.0.255 |
| Prefix Length | /24 |
| IP Address Class | Class A |
| Total IP Addresses | 256 |
| Usable Host Addresses | 254 |
| First Usable IP | 121.5.40.1 |
| Last Usable IP | 121.5.40.254 |
| Network (Hex) | 0x79052800 |
| Broadcast (Hex) | 0x790528FF |
| Address Type | Public / Globally Routable |
Binary Representation
The first 24 bits (1s in the mask) identify the network. The remaining 8 bits identify hosts within the network.
Split into Equal Subnets
Split 121.5.40.0/24 into 2 equal /25 subnets (126 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 121.5.40.0/25 | 121.5.40.0 | 121.5.40.1 | 121.5.40.126 | 121.5.40.127 | 126 |
| 2 | 121.5.40.128/25 | 121.5.40.128 | 121.5.40.129 | 121.5.40.254 | 121.5.40.255 | 126 |
Split 121.5.40.0/24 into 4 equal /26 subnets (62 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 121.5.40.0/26 | 121.5.40.0 | 121.5.40.1 | 121.5.40.62 | 121.5.40.63 | 62 |
| 2 | 121.5.40.64/26 | 121.5.40.64 | 121.5.40.65 | 121.5.40.126 | 121.5.40.127 | 62 |
| 3 | 121.5.40.128/26 | 121.5.40.128 | 121.5.40.129 | 121.5.40.190 | 121.5.40.191 | 62 |
| 4 | 121.5.40.192/26 | 121.5.40.192 | 121.5.40.193 | 121.5.40.254 | 121.5.40.255 | 62 |
Split 121.5.40.0/24 into 8 equal /27 subnets (30 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 121.5.40.0/27 | 121.5.40.0 | 121.5.40.1 | 121.5.40.30 | 121.5.40.31 | 30 |
| 2 | 121.5.40.32/27 | 121.5.40.32 | 121.5.40.33 | 121.5.40.62 | 121.5.40.63 | 30 |
| 3 | 121.5.40.64/27 | 121.5.40.64 | 121.5.40.65 | 121.5.40.94 | 121.5.40.95 | 30 |
| 4 | 121.5.40.96/27 | 121.5.40.96 | 121.5.40.97 | 121.5.40.126 | 121.5.40.127 | 30 |
| 5 | 121.5.40.128/27 | 121.5.40.128 | 121.5.40.129 | 121.5.40.158 | 121.5.40.159 | 30 |
| 6 | 121.5.40.160/27 | 121.5.40.160 | 121.5.40.161 | 121.5.40.190 | 121.5.40.191 | 30 |
| 7 | 121.5.40.192/27 | 121.5.40.192 | 121.5.40.193 | 121.5.40.222 | 121.5.40.223 | 30 |
| 8 | 121.5.40.224/27 | 121.5.40.224 | 121.5.40.225 | 121.5.40.254 | 121.5.40.255 | 30 |
Split 121.5.40.0/24 into 16 equal /28 subnets (14 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 121.5.40.0/28 | 121.5.40.0 | 121.5.40.1 | 121.5.40.14 | 121.5.40.15 | 14 |
| 2 | 121.5.40.16/28 | 121.5.40.16 | 121.5.40.17 | 121.5.40.30 | 121.5.40.31 | 14 |
| 3 | 121.5.40.32/28 | 121.5.40.32 | 121.5.40.33 | 121.5.40.46 | 121.5.40.47 | 14 |
| 4 | 121.5.40.48/28 | 121.5.40.48 | 121.5.40.49 | 121.5.40.62 | 121.5.40.63 | 14 |
| 5 | 121.5.40.64/28 | 121.5.40.64 | 121.5.40.65 | 121.5.40.78 | 121.5.40.79 | 14 |
| 6 | 121.5.40.80/28 | 121.5.40.80 | 121.5.40.81 | 121.5.40.94 | 121.5.40.95 | 14 |
| 7 | 121.5.40.96/28 | 121.5.40.96 | 121.5.40.97 | 121.5.40.110 | 121.5.40.111 | 14 |
| 8 | 121.5.40.112/28 | 121.5.40.112 | 121.5.40.113 | 121.5.40.126 | 121.5.40.127 | 14 |
| 9 | 121.5.40.128/28 | 121.5.40.128 | 121.5.40.129 | 121.5.40.142 | 121.5.40.143 | 14 |
| 10 | 121.5.40.144/28 | 121.5.40.144 | 121.5.40.145 | 121.5.40.158 | 121.5.40.159 | 14 |
| 11 | 121.5.40.160/28 | 121.5.40.160 | 121.5.40.161 | 121.5.40.174 | 121.5.40.175 | 14 |
| 12 | 121.5.40.176/28 | 121.5.40.176 | 121.5.40.177 | 121.5.40.190 | 121.5.40.191 | 14 |
| 13 | 121.5.40.192/28 | 121.5.40.192 | 121.5.40.193 | 121.5.40.206 | 121.5.40.207 | 14 |
| 14 | 121.5.40.208/28 | 121.5.40.208 | 121.5.40.209 | 121.5.40.222 | 121.5.40.223 | 14 |
| 15 | 121.5.40.224/28 | 121.5.40.224 | 121.5.40.225 | 121.5.40.238 | 121.5.40.239 | 14 |
| 16 | 121.5.40.240/28 | 121.5.40.240 | 121.5.40.241 | 121.5.40.254 | 121.5.40.255 | 14 |
IP Address Sample
Showing first 16 of 256 total IPs.