/**
 * extract FullyQualifiedDomainName of this computer
 */
export declare function extractFullyQualifiedDomainName(): Promise<string>;
export declare function prepareFQDN(): Promise<void>;
export declare function getFullyQualifiedDomainName(optional_max_length?: number): string;
export declare function getHostname(): string;
export declare function resolveFullyQualifiedDomainName(str: string): string;
/**
 * Return all non-internal IPv4 addresses detected on this host.
 *
 * The result is sorted for deterministic output.
 */
export declare function getIpAddresses(): string[];
/**
 * Check whether a string is an IP address (v4 or v6).
 *
 * Returns `4` for IPv4, `6` for IPv6, or `0` if the string
 * is a hostname (not an IP literal).
 *
 * Useful for segregating `alternateHostname` and
 * `advertisedEndpoints` values into SAN `dNSName` vs
 * `iPAddress` entries.
 */
export declare function isIPAddress(value: string): 0 | 4 | 6;
/**
 * Convert a dotted-decimal IPv4 address to a hex string.
 *
 * This matches the format returned by `exploreCertificate`'s
 * `iPAddress` SAN entries (e.g. `"192.168.1.69"` → `"c0a80145"`).
 */
export declare function ipv4ToHex(ip: string): string;