251.72.100.0/22
PublicClass E (Reserved) — /22 prefix — 1,022 usable hosts
Network address — the base address of the block (251.72.100.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 251.72.103.255 are delivered to every device in the subnet. Also reserved — not assignable.
Usable hosts — the 1,022 addresses between those two that you can assign to servers, VMs, or interfaces.
Subnet mask — 255.255.252.0 is the dotted-decimal equivalent of /22. Older tools and Cisco configs use this format instead of CIDR slash notation.
Full Details
| CIDR Notation | 251.72.100.0/22 |
| Network Address | 251.72.100.0 |
| Broadcast Address | 251.72.103.255 |
| Subnet Mask | 255.255.252.0 |
| Wildcard Mask | 0.0.3.255 |
| Prefix Length | /22 |
| IP Address Class | Class E (Reserved) |
| Total IP Addresses | 1,024 |
| Usable Host Addresses | 1,022 |
| First Usable IP | 251.72.100.1 |
| Last Usable IP | 251.72.103.254 |
| Network (Hex) | 0xFB486400 |
| Broadcast (Hex) | 0xFB4867FF |
| Address Type | Public / Globally Routable |
Binary Representation
The first 22 bits (1s in the mask) identify the network. The remaining 10 bits identify hosts within the network.
Split into Equal Subnets
Split 251.72.100.0/22 into 2 equal /23 subnets (510 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 251.72.100.0/23 | 251.72.100.0 | 251.72.100.1 | 251.72.101.254 | 251.72.101.255 | 510 |
| 2 | 251.72.102.0/23 | 251.72.102.0 | 251.72.102.1 | 251.72.103.254 | 251.72.103.255 | 510 |
Split 251.72.100.0/22 into 4 equal /24 subnets (254 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 251.72.100.0/24 | 251.72.100.0 | 251.72.100.1 | 251.72.100.254 | 251.72.100.255 | 254 |
| 2 | 251.72.101.0/24 | 251.72.101.0 | 251.72.101.1 | 251.72.101.254 | 251.72.101.255 | 254 |
| 3 | 251.72.102.0/24 | 251.72.102.0 | 251.72.102.1 | 251.72.102.254 | 251.72.102.255 | 254 |
| 4 | 251.72.103.0/24 | 251.72.103.0 | 251.72.103.1 | 251.72.103.254 | 251.72.103.255 | 254 |
Split 251.72.100.0/22 into 8 equal /25 subnets (126 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 251.72.100.0/25 | 251.72.100.0 | 251.72.100.1 | 251.72.100.126 | 251.72.100.127 | 126 |
| 2 | 251.72.100.128/25 | 251.72.100.128 | 251.72.100.129 | 251.72.100.254 | 251.72.100.255 | 126 |
| 3 | 251.72.101.0/25 | 251.72.101.0 | 251.72.101.1 | 251.72.101.126 | 251.72.101.127 | 126 |
| 4 | 251.72.101.128/25 | 251.72.101.128 | 251.72.101.129 | 251.72.101.254 | 251.72.101.255 | 126 |
| 5 | 251.72.102.0/25 | 251.72.102.0 | 251.72.102.1 | 251.72.102.126 | 251.72.102.127 | 126 |
| 6 | 251.72.102.128/25 | 251.72.102.128 | 251.72.102.129 | 251.72.102.254 | 251.72.102.255 | 126 |
| 7 | 251.72.103.0/25 | 251.72.103.0 | 251.72.103.1 | 251.72.103.126 | 251.72.103.127 | 126 |
| 8 | 251.72.103.128/25 | 251.72.103.128 | 251.72.103.129 | 251.72.103.254 | 251.72.103.255 | 126 |
Split 251.72.100.0/22 into 16 equal /26 subnets (62 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 251.72.100.0/26 | 251.72.100.0 | 251.72.100.1 | 251.72.100.62 | 251.72.100.63 | 62 |
| 2 | 251.72.100.64/26 | 251.72.100.64 | 251.72.100.65 | 251.72.100.126 | 251.72.100.127 | 62 |
| 3 | 251.72.100.128/26 | 251.72.100.128 | 251.72.100.129 | 251.72.100.190 | 251.72.100.191 | 62 |
| 4 | 251.72.100.192/26 | 251.72.100.192 | 251.72.100.193 | 251.72.100.254 | 251.72.100.255 | 62 |
| 5 | 251.72.101.0/26 | 251.72.101.0 | 251.72.101.1 | 251.72.101.62 | 251.72.101.63 | 62 |
| 6 | 251.72.101.64/26 | 251.72.101.64 | 251.72.101.65 | 251.72.101.126 | 251.72.101.127 | 62 |
| 7 | 251.72.101.128/26 | 251.72.101.128 | 251.72.101.129 | 251.72.101.190 | 251.72.101.191 | 62 |
| 8 | 251.72.101.192/26 | 251.72.101.192 | 251.72.101.193 | 251.72.101.254 | 251.72.101.255 | 62 |
| 9 | 251.72.102.0/26 | 251.72.102.0 | 251.72.102.1 | 251.72.102.62 | 251.72.102.63 | 62 |
| 10 | 251.72.102.64/26 | 251.72.102.64 | 251.72.102.65 | 251.72.102.126 | 251.72.102.127 | 62 |
| 11 | 251.72.102.128/26 | 251.72.102.128 | 251.72.102.129 | 251.72.102.190 | 251.72.102.191 | 62 |
| 12 | 251.72.102.192/26 | 251.72.102.192 | 251.72.102.193 | 251.72.102.254 | 251.72.102.255 | 62 |
| 13 | 251.72.103.0/26 | 251.72.103.0 | 251.72.103.1 | 251.72.103.62 | 251.72.103.63 | 62 |
| 14 | 251.72.103.64/26 | 251.72.103.64 | 251.72.103.65 | 251.72.103.126 | 251.72.103.127 | 62 |
| 15 | 251.72.103.128/26 | 251.72.103.128 | 251.72.103.129 | 251.72.103.190 | 251.72.103.191 | 62 |
| 16 | 251.72.103.192/26 | 251.72.103.192 | 251.72.103.193 | 251.72.103.254 | 251.72.103.255 | 62 |