🧮 IP Calculator
Subnet calculation, ranges, masks and CIDR notation
Subnet Mask Selector
Network
| CIDR Notation | 172.0.0.0/17 |
| Network Address | 172.0.0.0 |
| Broadcast Address | 172.0.127.255 |
| First Host | 172.0.0.1 |
| Last Host | 172.0.127.254 |
Mask & Stats
| Subnet Mask | 255.255.128.0 |
| Wildcard Mask | 0.0.127.255 |
| Total Hosts | 32,768 |
| Usable Hosts | 32,766 |
| IP Class | Class B |
| Address Type | Public |
Binary Representation
IP IP in Binary
10101100.00000000.00000000.00000000
█ network bits
█ host bits
Mask in Binary
11111111.11111111.10000000.00000000
Subnet Splitter
| # | Subnet (/21) | Range | Broadcast Address | Usable Hosts |
|---|---|---|---|---|
| 1 | 172.0.0.0/21 | 172.0.0.1 — 172.0.7.254 | 172.0.7.255 | 2,046 |
| 2 | 172.0.8.0/21 | 172.0.8.1 — 172.0.15.254 | 172.0.15.255 | 2,046 |
| 3 | 172.0.16.0/21 | 172.0.16.1 — 172.0.23.254 | 172.0.23.255 | 2,046 |
| 4 | 172.0.24.0/21 | 172.0.24.1 — 172.0.31.254 | 172.0.31.255 | 2,046 |
| 5 | 172.0.32.0/21 | 172.0.32.1 — 172.0.39.254 | 172.0.39.255 | 2,046 |
| 6 | 172.0.40.0/21 | 172.0.40.1 — 172.0.47.254 | 172.0.47.255 | 2,046 |
| 7 | 172.0.48.0/21 | 172.0.48.1 — 172.0.55.254 | 172.0.55.255 | 2,046 |
| 8 | 172.0.56.0/21 | 172.0.56.1 — 172.0.63.254 | 172.0.63.255 | 2,046 |
| 9 | 172.0.64.0/21 | 172.0.64.1 — 172.0.71.254 | 172.0.71.255 | 2,046 |
| 10 | 172.0.72.0/21 | 172.0.72.1 — 172.0.79.254 | 172.0.79.255 | 2,046 |
| 11 | 172.0.80.0/21 | 172.0.80.1 — 172.0.87.254 | 172.0.87.255 | 2,046 |
| 12 | 172.0.88.0/21 | 172.0.88.1 — 172.0.95.254 | 172.0.95.255 | 2,046 |
| 13 | 172.0.96.0/21 | 172.0.96.1 — 172.0.103.254 | 172.0.103.255 | 2,046 |
| 14 | 172.0.104.0/21 | 172.0.104.1 — 172.0.111.254 | 172.0.111.255 | 2,046 |
| 15 | 172.0.112.0/21 | 172.0.112.1 — 172.0.119.254 | 172.0.119.255 | 2,046 |
| 16 | 172.0.120.0/21 | 172.0.120.1 — 172.0.127.254 | 172.0.127.255 | 2,046 |
Converter
IP → Integer
2885681152
Mask → CIDR
/ 17
Range (hex)
0xAC000000 — 0xAC007FFF
Quick Converter (no reload)
IP → Integer
Integer → IP
📊 Subnet Visualization
172.0.0.0
172.0.127.255
Network
▲ 172.0.0.0
Broadcast
Usable hosts: 32,766
Reserved: 2
your_ip
📋 Subnet Cheat Sheet
| CIDR | Mask | Hosts | Usage |
|---|---|---|---|
| /8 | 255.0.0.0 | 16,777,214 | Large Class A networks |
| /16 | 255.255.0.0 | 65,534 | Medium corporate networks |
| /24 | 255.255.255.0 | 254 | Typical home/office network |
| /25 | 255.255.255.128 | 126 | Half of /24 |
| /26 | 255.255.255.192 | 62 | Small department |
| /27 | 255.255.255.224 | 30 | Small office |
| /28 | 255.255.255.240 | 14 | Micro-segment |
| /29 | 255.255.255.248 | 6 | Point-to-point with hosts |
| /30 | 255.255.255.252 | 2 | Point-to-point link |
| /31 | 255.255.255.254 | 2 | P2P (RFC 3021) |
| /32 | 255.255.255.255 | 1 | Single host route |