export declare class SsrfBlockedError extends Error {
    code: string;
    constructor(message: string);
}
/**
 * If `ip` is an IPv4-mapped IPv6 address (`::ffff:0:0/96`), returns the
 * embedded IPv4 in dotted form. Otherwise returns undefined.
 *
 * Examples:
 * - `::ffff:1.2.3.4`   -> `'1.2.3.4'`
 * - `::ffff:a9fe:a9fe` -> `'169.254.169.254'`
 * - `::1`              -> `undefined`
 */
export declare function extractMappedIpv4(ip: string): string | undefined;
/**
 * True if `ip` (a literal IPv4/IPv6 string) is in a range unsafe to reach. Non-IP input is
 * treated as blocked (fail closed). Handles IPv4-mapped IPv6 by checking the embedded IPv4.
 */
export declare function isBlockedIp(ip: string): boolean;
/** True if `ip` (a literal IPv4/IPv6 string) is a loopback address. Non-IP input returns false. */
export declare function isLoopback(ip: string): boolean;
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