Module validation 

Domain validation and SSRF protection utilities

Functions

describe_reserved_ip

Returns a human-readable reason why an IP is blocked, or None if it is safe. Intended for error messages — callers should still use is_private_or_reserved_ip for the fast boolean check.

is_private_or_reserved_ip

Checks if an IP address is in a private or reserved range.

normalize_domain

Normalizes and validates a domain name.

validate_domain_safe

Validates that a domain is safe to query (SSRF protection).