/**
 * Build the public multiaddrs of one hosted node from the host's current
 * understanding of its dialable surface.
 *
 * Pure so it's trivial to unit-test, and so `NatService` is the only place
 * that turns settings and routes into addresses. The addresses carry no
 * `/p2p/` suffix: the node appends its own (cadre-core `normalizeSelfAddrs`,
 * libp2p for announce addresses). The node's own LAN addresses are not here
 * either — libp2p reports those itself.
 */
import type { PortRoute } from './types.js';
export interface PublicAddressInput {
    ddnsHostname: string | null;
    /** Last known public IPv4; null when unknown. */
    externalIp: string | null;
    cgnatDetected: boolean;
    tcp: PortRoute;
    ws: PortRoute | null;
}
export declare function buildPublicAddresses(input: PublicAddressInput): string[];
/** True for a hostname of dot-separated RFC 1123 labels, at most 253 characters. */
export declare function isDnsHostname(s: string): boolean;
/** True for a dotted-quad IPv4 outside every non-public range above. */
export declare function isPublicIpv4(s: string): boolean;