Add CLI script for domain lookup and create package-lock.json; update README and package.json for clarity and dependencies

src/utils.ts

@@ -1,3 +1,5 @@
+import psl from "psl";
+
 // Lightweight date parsing helpers to avoid external dependencies.
 // We aim to parse common RDAP and WHOIS date representations and return a UTC ISO string.
 export function toISO(
@@ -189,6 +191,19 @@ export function sleep(ms: number): Promise<void> {
 
 export function extractTld(domain: string): string {
   const lower = domain.trim().toLowerCase();
+  try {
+    const parsed = psl.parse?.(lower);
+    if (!("tld" in parsed)) {
+      return lower;
+    }
+    const suffix = parsed?.tld;
+    if (suffix) {
+      const labels = String(suffix).split(".").filter(Boolean);
+      if (labels.length) return labels[labels.length - 1];
+    }
+  } catch {
+    // ignore and fall back
+  }
   const parts = lower.split(".").filter(Boolean);
   return parts[parts.length - 1] ?? lower;
 }

src/whois-fallbacks.ts

@@ -1,84 +0,0 @@
-// Centralized WHOIS server fallbacks by TLD.
-// These are used when IANA's TLD page does not list a server or is unreachable.
-export const WHOIS_FALLBACKS: Record<string, string> = {
-  // gTLDs
-  com: "whois.verisign-grs.com",
-  net: "whois.verisign-grs.com",
-  org: "whois.pir.org",
-  info: "whois.afilias.net",
-  biz: "whois.nic.biz",
-  xyz: "whois.nic.xyz",
-  top: "whois.nic.top",
-  club: "whois.nic.club",
-  site: "whois.nic.site",
-  online: "whois.nic.online",
-  shop: "whois.nic.shop",
-  store: "whois.nic.store",
-  tech: "whois.nic.tech",
-  space: "whois.nic.space",
-  link: "whois.nic.link",
-  guru: "whois.nic.guru",
-  mobi: "whois.nic.mobi",
-  name: "whois.nic.name",
-  pro: "whois.nic.pro",
-  tel: "whois.nic.tel",
-  travel: "whois.nic.travel",
-  aero: "whois.aero",
-  jobs: "whois.nic.jobs",
-  cat: "whois.nic.cat",
-  museum: "whois.museum",
-  coop: "whois.nic.coop",
-  asia: "whois.nic.asia",
-  app: "whois.nic.google",
-  dev: "whois.nic.google",
-  page: "whois.nic.google",
-  blog: "whois.nic.blog",
-  // ccTLDs (port 43 policy varies by registry)
-  us: "whois.nic.us",
-  uk: "whois.nic.uk",
-  co: "whois.nic.co",
-  me: "whois.nic.me",
-  tv: "whois.nic.tv",
-  io: "whois.nic.io",
-  ai: "whois.nic.ai",
-  de: "whois.denic.de",
-  fr: "whois.nic.fr",
-  nl: "whois.domain-registry.nl",
-  ru: "whois.tcinet.ru",
-  pl: "whois.dns.pl",
-  br: "whois.registro.br",
-  it: "whois.nic.it",
-  es: "whois.nic.es",
-  se: "whois.iis.se",
-  no: "whois.norid.no",
-  dk: "whois.dk-hostmaster.dk",
-  fi: "whois.fi",
-  ch: "whois.nic.ch",
-  at: "whois.nic.at",
-  be: "whois.dns.be",
-  cz: "whois.nic.cz",
-  sk: "whois.sk-nic.sk",
-  hu: "whois.nic.hu",
-  ro: "whois.rotld.ro",
-  bg: "whois.register.bg",
-  gr: "whois.ics.forth.gr",
-  tr: "whois.trabis.gov.tr",
-  il: "whois.isoc.org.il",
-  za: "whois.registry.net.za",
-  nz: "whois.srs.net.nz",
-  jp: "whois.jprs.jp",
-  cn: "whois.cnnic.cn",
-  kr: "whois.kr",
-  tw: "whois.twnic.net.tw",
-  sg: "whois.sgnic.sg",
-  hk: "whois.hkirc.hk",
-  id: "whois.id",
-  my: "whois.mynic.my",
-  ph: "whois.dot.ph",
-  th: "whois.thnic.co.th",
-  vn: "whois.vnnic.vn",
-  mx: "whois.mx",
-  ar: "whois.nic.ar",
-  cl: "whois.nic.cl",
-  pe: "kero.yachay.pe",
-};

src/whois.ts

@@ -2,7 +2,6 @@ import { createConnection } from "node:net";
 import { DEFAULT_TIMEOUT_MS } from "./config.js";
 import type { LookupOptions } from "./types.js";
 import { withTimeout } from "./utils.js";
-import { WHOIS_FALLBACKS } from "./whois-fallbacks.js";
 
 export interface WhoisQueryResult {
   serverQueried: string;
@@ -73,6 +72,11 @@ export async function ianaWhoisServerForTld(
   tld: string,
   options?: LookupOptions,
 ): Promise<string | undefined> {
+  const EXCEPTIONS: Record<string, string> = {
+    com: "whois.verisign-grs.com",
+    net: "whois.verisign-grs.com",
+    org: "whois.pir.org",
+  };
   const url = `https://www.iana.org/domains/root/db/${encodeURIComponent(tld)}.html`;
   try {
     const res = await withTimeout(
@@ -86,14 +90,10 @@ export async function ianaWhoisServerForTld(
       html.match(/Whois Server:\s*([^<\n]+)/i);
     const server = m?.[1]?.trim();
     if (!server)
-      return (
-        WHOIS_FALLBACKS[tld.toLowerCase()] ?? `whois.nic.${tld.toLowerCase()}`
-      );
+      return EXCEPTIONS[tld.toLowerCase()] ?? `whois.nic.${tld.toLowerCase()}`;
     return server.replace(/^https?:\/\//i, "").replace(/\/$/, "");
   } catch {
-    return (
-      WHOIS_FALLBACKS[tld.toLowerCase()] ?? `whois.nic.${tld.toLowerCase()}`
-    );
+    return EXCEPTIONS[tld.toLowerCase()] ?? `whois.nic.${tld.toLowerCase()}`;
   }
 }