IP CIDR Matcher is a lightweight utility extension that checks whether a given IP address (IPv4 or IPv6) belongs to one or more CIDR ranges.

This component is designed for server-side use in OutSystems applications, especially when implementing IP-based access control, environment restrictions, or feature gating.

It supports common real-world scenarios such as:

• CIDR notation (e.g. 192.168.1.0/24, 2001:db8::/32)

• Single IP rules (treated as /32 for IPv4 or /128 for IPv6)

• IPv4 and IPv6 matching

• X-Forwarded-For style input (e.g. "client, proxy1, proxy2")

• IP strings with port numbers (e.g. "1.2.3.4:443", "[2001:db8::1]:443")

The extension focuses only on CIDR matching logic.
IP address retrieval (e.g. from request headers) is intentionally left to the application layer, allowing flexible integration with different deployment environments.