Browser-based utilities for network engineers. No install, no account, no rate limits.
The whole stack — subnetting to BGP to firewall audits to automation — with a copy-paste Claude prompt on every node. Track your progress right in the browser.
Open the roadmap →Enter any IP address with a CIDR prefix to get network address, broadcast, host range, subnet mask, and wildcard mask. Click any row in the prefix table to recalculate.
| Prefix | Hosts | Notes |
|---|---|---|
| /30 | 2 | Point-to-point |
| /29 | 6 | Small segment |
| /28 | 14 | 14 hosts |
| /27 | 30 | 30 hosts |
| /26 | 62 | 62 hosts |
| /25 | 126 | Half-C |
| /24 | 254 | /24 — class C |
| /23 | 510 | 2× /24 |
| /22 | 1,022 | 4× /24 |
| /21 | 2,046 | 8× /24 |
| /20 | 4,094 | 16× /24 |
| /16 | 65,534 | Class B |
Paste a subnet mask, a wildcard mask, or a CIDR prefix — get all three
plus a ready-to-paste Cisco ACL line. The wildcard is the bitwise
inverse the IOS ACL and OSPF network statements expect.
network statements expect.| Prefix | Subnet mask | Wildcard |
|---|---|---|
| /30 | 255.255.255.252 | 0.0.0.3 |
| /29 | 255.255.255.248 | 0.0.0.7 |
| /28 | 255.255.255.240 | 0.0.0.15 |
| /27 | 255.255.255.224 | 0.0.0.31 |
| /26 | 255.255.255.192 | 0.0.0.63 |
| /25 | 255.255.255.128 | 0.0.0.127 |
| /24 | 255.255.255.0 | 0.0.0.255 |
| /23 | 255.255.254.0 | 0.0.1.255 |
| /22 | 255.255.252.0 | 0.0.3.255 |
| /16 | 255.255.0.0 | 0.0.255.255 |
| /8 | 255.0.0.0 | 0.255.255.255 |
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