21.66.44.0/25
PublicClass A — /25 prefix — 126 usable hosts
Network address — the base address of the block (21.66.44.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 21.66.44.127 are delivered to every device in the subnet. Also reserved — not assignable.
Usable hosts — the 126 addresses between those two that you can assign to servers, VMs, or interfaces.
Subnet mask — 255.255.255.128 is the dotted-decimal equivalent of /25. Older tools and Cisco configs use this format instead of CIDR slash notation.
Full Details
| CIDR Notation | 21.66.44.0/25 |
| Network Address | 21.66.44.0 |
| Broadcast Address | 21.66.44.127 |
| Subnet Mask | 255.255.255.128 |
| Wildcard Mask | 0.0.0.127 |
| Prefix Length | /25 |
| IP Address Class | Class A |
| Total IP Addresses | 128 |
| Usable Host Addresses | 126 |
| First Usable IP | 21.66.44.1 |
| Last Usable IP | 21.66.44.126 |
| Network (Hex) | 0x15422C00 |
| Broadcast (Hex) | 0x15422C7F |
| Address Type | Public / Globally Routable |
Binary Representation
The first 25 bits (1s in the mask) identify the network. The remaining 7 bits identify hosts within the network.
Split into Equal Subnets
Split 21.66.44.0/25 into 2 equal /26 subnets (62 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 21.66.44.0/26 | 21.66.44.0 | 21.66.44.1 | 21.66.44.62 | 21.66.44.63 | 62 |
| 2 | 21.66.44.64/26 | 21.66.44.64 | 21.66.44.65 | 21.66.44.126 | 21.66.44.127 | 62 |
Split 21.66.44.0/25 into 4 equal /27 subnets (30 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 21.66.44.0/27 | 21.66.44.0 | 21.66.44.1 | 21.66.44.30 | 21.66.44.31 | 30 |
| 2 | 21.66.44.32/27 | 21.66.44.32 | 21.66.44.33 | 21.66.44.62 | 21.66.44.63 | 30 |
| 3 | 21.66.44.64/27 | 21.66.44.64 | 21.66.44.65 | 21.66.44.94 | 21.66.44.95 | 30 |
| 4 | 21.66.44.96/27 | 21.66.44.96 | 21.66.44.97 | 21.66.44.126 | 21.66.44.127 | 30 |
Split 21.66.44.0/25 into 8 equal /28 subnets (14 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 21.66.44.0/28 | 21.66.44.0 | 21.66.44.1 | 21.66.44.14 | 21.66.44.15 | 14 |
| 2 | 21.66.44.16/28 | 21.66.44.16 | 21.66.44.17 | 21.66.44.30 | 21.66.44.31 | 14 |
| 3 | 21.66.44.32/28 | 21.66.44.32 | 21.66.44.33 | 21.66.44.46 | 21.66.44.47 | 14 |
| 4 | 21.66.44.48/28 | 21.66.44.48 | 21.66.44.49 | 21.66.44.62 | 21.66.44.63 | 14 |
| 5 | 21.66.44.64/28 | 21.66.44.64 | 21.66.44.65 | 21.66.44.78 | 21.66.44.79 | 14 |
| 6 | 21.66.44.80/28 | 21.66.44.80 | 21.66.44.81 | 21.66.44.94 | 21.66.44.95 | 14 |
| 7 | 21.66.44.96/28 | 21.66.44.96 | 21.66.44.97 | 21.66.44.110 | 21.66.44.111 | 14 |
| 8 | 21.66.44.112/28 | 21.66.44.112 | 21.66.44.113 | 21.66.44.126 | 21.66.44.127 | 14 |
Split 21.66.44.0/25 into 16 equal /29 subnets (6 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 21.66.44.0/29 | 21.66.44.0 | 21.66.44.1 | 21.66.44.6 | 21.66.44.7 | 6 |
| 2 | 21.66.44.8/29 | 21.66.44.8 | 21.66.44.9 | 21.66.44.14 | 21.66.44.15 | 6 |
| 3 | 21.66.44.16/29 | 21.66.44.16 | 21.66.44.17 | 21.66.44.22 | 21.66.44.23 | 6 |
| 4 | 21.66.44.24/29 | 21.66.44.24 | 21.66.44.25 | 21.66.44.30 | 21.66.44.31 | 6 |
| 5 | 21.66.44.32/29 | 21.66.44.32 | 21.66.44.33 | 21.66.44.38 | 21.66.44.39 | 6 |
| 6 | 21.66.44.40/29 | 21.66.44.40 | 21.66.44.41 | 21.66.44.46 | 21.66.44.47 | 6 |
| 7 | 21.66.44.48/29 | 21.66.44.48 | 21.66.44.49 | 21.66.44.54 | 21.66.44.55 | 6 |
| 8 | 21.66.44.56/29 | 21.66.44.56 | 21.66.44.57 | 21.66.44.62 | 21.66.44.63 | 6 |
| 9 | 21.66.44.64/29 | 21.66.44.64 | 21.66.44.65 | 21.66.44.70 | 21.66.44.71 | 6 |
| 10 | 21.66.44.72/29 | 21.66.44.72 | 21.66.44.73 | 21.66.44.78 | 21.66.44.79 | 6 |
| 11 | 21.66.44.80/29 | 21.66.44.80 | 21.66.44.81 | 21.66.44.86 | 21.66.44.87 | 6 |
| 12 | 21.66.44.88/29 | 21.66.44.88 | 21.66.44.89 | 21.66.44.94 | 21.66.44.95 | 6 |
| 13 | 21.66.44.96/29 | 21.66.44.96 | 21.66.44.97 | 21.66.44.102 | 21.66.44.103 | 6 |
| 14 | 21.66.44.104/29 | 21.66.44.104 | 21.66.44.105 | 21.66.44.110 | 21.66.44.111 | 6 |
| 15 | 21.66.44.112/29 | 21.66.44.112 | 21.66.44.113 | 21.66.44.118 | 21.66.44.119 | 6 |
| 16 | 21.66.44.120/29 | 21.66.44.120 | 21.66.44.121 | 21.66.44.126 | 21.66.44.127 | 6 |
IP Address Sample
Showing first 16 of 128 total IPs.