Build IP access control lists for web servers and firewalls with CIDR support and rule ordering.
IP ACL Builder turns IP-based access decisions into an ordered ACL draft for a web server or firewall. Add individual addresses or CIDR prefixes, assign the intended access action, and arrange rules in the sequence required by the destination system. The important surprise is that a prefix can cover many addresses, not just the address shown, and an overlapping rule can change meaning when moved. Because source ranges may reveal network structure, the in-browser operation keeps the entered list on the device rather than uploading it.
An entry can identify one address or a CIDR prefix. For IPv4, the prefix length states how many of 32 bits identify the network. A /24 leaves 8 variable bits and therefore covers 256 addresses. The builder applies that complete scope to the rule, so the prefix length must describe the entire range you intend to control.
Rules form an ordered list so broad network entries and narrow exceptions can be placed deliberately. If two entries can match the same source, their final effect depends on the evaluation model of the destination web server or firewall. Preserve the displayed sequence when transferring the result unless the target documentation specifies a different precedence scheme.
No. An IPv4 address followed by /32 identifies one address, while shorter prefixes identify blocks. For example, a /24 contains 256 addresses. For IPv6, /128 identifies one address. If you intend to match one source, use the full host prefix or an individual-address form accepted by the destination.
No, not without target-specific review. The builder can organize the requested entries, but it cannot know the surrounding configuration, default policy, platform version, or whether a management address would be locked out. Validate the syntax for the exact destination, inspect overlaps, test permitted and denied sources, and retain a recovery path.
The behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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