172.178.100.0/25
PublicClass B — /25 prefix — 126 usable hosts
Network address — the base address of the block (172.178.100.0). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 172.178.100.127 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 | 172.178.100.0/25 |
| Network Address | 172.178.100.0 |
| Broadcast Address | 172.178.100.127 |
| Subnet Mask | 255.255.255.128 |
| Wildcard Mask | 0.0.0.127 |
| Prefix Length | /25 |
| IP Address Class | Class B |
| Total IP Addresses | 128 |
| Usable Host Addresses | 126 |
| First Usable IP | 172.178.100.1 |
| Last Usable IP | 172.178.100.126 |
| Network (Hex) | 0xACB26400 |
| Broadcast (Hex) | 0xACB2647F |
| 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 172.178.100.0/25 into 2 equal /26 subnets (62 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 172.178.100.0/26 | 172.178.100.0 | 172.178.100.1 | 172.178.100.62 | 172.178.100.63 | 62 |
| 2 | 172.178.100.64/26 | 172.178.100.64 | 172.178.100.65 | 172.178.100.126 | 172.178.100.127 | 62 |
Split 172.178.100.0/25 into 4 equal /27 subnets (30 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 172.178.100.0/27 | 172.178.100.0 | 172.178.100.1 | 172.178.100.30 | 172.178.100.31 | 30 |
| 2 | 172.178.100.32/27 | 172.178.100.32 | 172.178.100.33 | 172.178.100.62 | 172.178.100.63 | 30 |
| 3 | 172.178.100.64/27 | 172.178.100.64 | 172.178.100.65 | 172.178.100.94 | 172.178.100.95 | 30 |
| 4 | 172.178.100.96/27 | 172.178.100.96 | 172.178.100.97 | 172.178.100.126 | 172.178.100.127 | 30 |
Split 172.178.100.0/25 into 8 equal /28 subnets (14 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 172.178.100.0/28 | 172.178.100.0 | 172.178.100.1 | 172.178.100.14 | 172.178.100.15 | 14 |
| 2 | 172.178.100.16/28 | 172.178.100.16 | 172.178.100.17 | 172.178.100.30 | 172.178.100.31 | 14 |
| 3 | 172.178.100.32/28 | 172.178.100.32 | 172.178.100.33 | 172.178.100.46 | 172.178.100.47 | 14 |
| 4 | 172.178.100.48/28 | 172.178.100.48 | 172.178.100.49 | 172.178.100.62 | 172.178.100.63 | 14 |
| 5 | 172.178.100.64/28 | 172.178.100.64 | 172.178.100.65 | 172.178.100.78 | 172.178.100.79 | 14 |
| 6 | 172.178.100.80/28 | 172.178.100.80 | 172.178.100.81 | 172.178.100.94 | 172.178.100.95 | 14 |
| 7 | 172.178.100.96/28 | 172.178.100.96 | 172.178.100.97 | 172.178.100.110 | 172.178.100.111 | 14 |
| 8 | 172.178.100.112/28 | 172.178.100.112 | 172.178.100.113 | 172.178.100.126 | 172.178.100.127 | 14 |
Split 172.178.100.0/25 into 16 equal /29 subnets (6 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 172.178.100.0/29 | 172.178.100.0 | 172.178.100.1 | 172.178.100.6 | 172.178.100.7 | 6 |
| 2 | 172.178.100.8/29 | 172.178.100.8 | 172.178.100.9 | 172.178.100.14 | 172.178.100.15 | 6 |
| 3 | 172.178.100.16/29 | 172.178.100.16 | 172.178.100.17 | 172.178.100.22 | 172.178.100.23 | 6 |
| 4 | 172.178.100.24/29 | 172.178.100.24 | 172.178.100.25 | 172.178.100.30 | 172.178.100.31 | 6 |
| 5 | 172.178.100.32/29 | 172.178.100.32 | 172.178.100.33 | 172.178.100.38 | 172.178.100.39 | 6 |
| 6 | 172.178.100.40/29 | 172.178.100.40 | 172.178.100.41 | 172.178.100.46 | 172.178.100.47 | 6 |
| 7 | 172.178.100.48/29 | 172.178.100.48 | 172.178.100.49 | 172.178.100.54 | 172.178.100.55 | 6 |
| 8 | 172.178.100.56/29 | 172.178.100.56 | 172.178.100.57 | 172.178.100.62 | 172.178.100.63 | 6 |
| 9 | 172.178.100.64/29 | 172.178.100.64 | 172.178.100.65 | 172.178.100.70 | 172.178.100.71 | 6 |
| 10 | 172.178.100.72/29 | 172.178.100.72 | 172.178.100.73 | 172.178.100.78 | 172.178.100.79 | 6 |
| 11 | 172.178.100.80/29 | 172.178.100.80 | 172.178.100.81 | 172.178.100.86 | 172.178.100.87 | 6 |
| 12 | 172.178.100.88/29 | 172.178.100.88 | 172.178.100.89 | 172.178.100.94 | 172.178.100.95 | 6 |
| 13 | 172.178.100.96/29 | 172.178.100.96 | 172.178.100.97 | 172.178.100.102 | 172.178.100.103 | 6 |
| 14 | 172.178.100.104/29 | 172.178.100.104 | 172.178.100.105 | 172.178.100.110 | 172.178.100.111 | 6 |
| 15 | 172.178.100.112/29 | 172.178.100.112 | 172.178.100.113 | 172.178.100.118 | 172.178.100.119 | 6 |
| 16 | 172.178.100.120/29 | 172.178.100.120 | 172.178.100.121 | 172.178.100.126 | 172.178.100.127 | 6 |
IP Address Sample
Showing first 16 of 128 total IPs.