172.19.164.128/25
Private (RFC 1918) RFC 1918Class B — /25 prefix — 126 usable hosts
Network address — the base address of the block (172.19.164.128). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 172.19.164.255 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 | 172.19.164.128/25 |
| Network Address | 172.19.164.128 |
| Broadcast Address | 172.19.164.255 |
| 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 | 172.19.164.129 |
| Last Usable IP | 172.19.164.254 |
| Network (Hex) | 0xAC13A480 |
| Broadcast (Hex) | 0xAC13A4FF |
| Governing RFC | RFC 1918 |
| Address Type | Private (RFC 1918) |
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 172.19.164.128/25 into 2 equal /26 subnets (62 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 172.19.164.128/26 | 172.19.164.128 | 172.19.164.129 | 172.19.164.190 | 172.19.164.191 | 62 |
| 2 | 172.19.164.192/26 | 172.19.164.192 | 172.19.164.193 | 172.19.164.254 | 172.19.164.255 | 62 |
Split 172.19.164.128/25 into 4 equal /27 subnets (30 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 172.19.164.128/27 | 172.19.164.128 | 172.19.164.129 | 172.19.164.158 | 172.19.164.159 | 30 |
| 2 | 172.19.164.160/27 | 172.19.164.160 | 172.19.164.161 | 172.19.164.190 | 172.19.164.191 | 30 |
| 3 | 172.19.164.192/27 | 172.19.164.192 | 172.19.164.193 | 172.19.164.222 | 172.19.164.223 | 30 |
| 4 | 172.19.164.224/27 | 172.19.164.224 | 172.19.164.225 | 172.19.164.254 | 172.19.164.255 | 30 |
Split 172.19.164.128/25 into 8 equal /28 subnets (14 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 172.19.164.128/28 | 172.19.164.128 | 172.19.164.129 | 172.19.164.142 | 172.19.164.143 | 14 |
| 2 | 172.19.164.144/28 | 172.19.164.144 | 172.19.164.145 | 172.19.164.158 | 172.19.164.159 | 14 |
| 3 | 172.19.164.160/28 | 172.19.164.160 | 172.19.164.161 | 172.19.164.174 | 172.19.164.175 | 14 |
| 4 | 172.19.164.176/28 | 172.19.164.176 | 172.19.164.177 | 172.19.164.190 | 172.19.164.191 | 14 |
| 5 | 172.19.164.192/28 | 172.19.164.192 | 172.19.164.193 | 172.19.164.206 | 172.19.164.207 | 14 |
| 6 | 172.19.164.208/28 | 172.19.164.208 | 172.19.164.209 | 172.19.164.222 | 172.19.164.223 | 14 |
| 7 | 172.19.164.224/28 | 172.19.164.224 | 172.19.164.225 | 172.19.164.238 | 172.19.164.239 | 14 |
| 8 | 172.19.164.240/28 | 172.19.164.240 | 172.19.164.241 | 172.19.164.254 | 172.19.164.255 | 14 |
Split 172.19.164.128/25 into 16 equal /29 subnets (6 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 172.19.164.128/29 | 172.19.164.128 | 172.19.164.129 | 172.19.164.134 | 172.19.164.135 | 6 |
| 2 | 172.19.164.136/29 | 172.19.164.136 | 172.19.164.137 | 172.19.164.142 | 172.19.164.143 | 6 |
| 3 | 172.19.164.144/29 | 172.19.164.144 | 172.19.164.145 | 172.19.164.150 | 172.19.164.151 | 6 |
| 4 | 172.19.164.152/29 | 172.19.164.152 | 172.19.164.153 | 172.19.164.158 | 172.19.164.159 | 6 |
| 5 | 172.19.164.160/29 | 172.19.164.160 | 172.19.164.161 | 172.19.164.166 | 172.19.164.167 | 6 |
| 6 | 172.19.164.168/29 | 172.19.164.168 | 172.19.164.169 | 172.19.164.174 | 172.19.164.175 | 6 |
| 7 | 172.19.164.176/29 | 172.19.164.176 | 172.19.164.177 | 172.19.164.182 | 172.19.164.183 | 6 |
| 8 | 172.19.164.184/29 | 172.19.164.184 | 172.19.164.185 | 172.19.164.190 | 172.19.164.191 | 6 |
| 9 | 172.19.164.192/29 | 172.19.164.192 | 172.19.164.193 | 172.19.164.198 | 172.19.164.199 | 6 |
| 10 | 172.19.164.200/29 | 172.19.164.200 | 172.19.164.201 | 172.19.164.206 | 172.19.164.207 | 6 |
| 11 | 172.19.164.208/29 | 172.19.164.208 | 172.19.164.209 | 172.19.164.214 | 172.19.164.215 | 6 |
| 12 | 172.19.164.216/29 | 172.19.164.216 | 172.19.164.217 | 172.19.164.222 | 172.19.164.223 | 6 |
| 13 | 172.19.164.224/29 | 172.19.164.224 | 172.19.164.225 | 172.19.164.230 | 172.19.164.231 | 6 |
| 14 | 172.19.164.232/29 | 172.19.164.232 | 172.19.164.233 | 172.19.164.238 | 172.19.164.239 | 6 |
| 15 | 172.19.164.240/29 | 172.19.164.240 | 172.19.164.241 | 172.19.164.246 | 172.19.164.247 | 6 |
| 16 | 172.19.164.248/29 | 172.19.164.248 | 172.19.164.249 | 172.19.164.254 | 172.19.164.255 | 6 |
IP Address Sample
Showing first 16 of 128 total IPs.