🔍 DNS Lookup

Quick DNS record checks — A, AAAA, MX, CNAME, TXT, NS

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\n\n \n\n`;\n}\n",[],[161,179],{"_105":188,"_97":189,"_162":190,"_164":163,"_165":147,"_166":146,"_168":120,"_107":191,"_102":167,"_170":183,"_172":192,"_173":22,"_174":-5,"_175":193,"_100":194},"df59ed5a-f2f8-11f0-b5a9-42dde27851f2","resolver.ts","c765a19a-f2f7-11f0-ad56-42dde27851f2",["D",1768581116129],"import type { RecordType, RecordResult, LookupResult, MXRecord } from \"./types.ts\";\n\n// Use Cloudflare DNS-over-HTTPS for reliable, consistent results\nasync function dohQuery(domain: string, type: RecordType): Promise {\n const url = `https://cloudflare-dns.com/dns-query?name=${encodeURIComponent(domain)}&type=${type}`;\n \n try {\n const res = await fetch(url, {\n headers: { Accept: \"application/dns-json\" },\n });\n \n if (!res.ok) {\n return { type, records: [], error: `DNS query failed: ${res.status}` };\n }\n \n const data = await res.json();\n \n // Status codes: 0 = NOERROR, 3 = NXDOMAIN\n if (data.Status === 3) {\n return { type, records: [], error: \"Domain not found (NXDOMAIN)\" };\n }\n \n if (!data.Answer || data.Answer.length === 0) {\n return { type, records: [] };\n }\n \n // Filter answers to only the requested type\n // DoH returns type as number: A=1, AAAA=28, CNAME=5, MX=15, TXT=16, NS=2\n const typeMap: Record = {\n A: 1, AAAA: 28, CNAME: 5, MX: 15, TXT: 16, NS: 2\n };\n const typeNum = typeMap[type];\n \n const filtered = data.Answer.filter((a: any) => a.type === typeNum);\n \n if (filtered.length === 0) {\n return { type, records: [] };\n }\n \n if (type === \"MX\") {\n const mxRecords: MXRecord[] = filtered.map((a: any) => {\n // MX data format: \"priority exchange\" e.g. \"10 mail.example.com.\"\n const parts = a.data.split(\" \");\n return {\n preference: parseInt(parts[0], 10),\n exchange: parts.slice(1).join(\" \").replace(/\\.$/, \"\"),\n };\n });\n mxRecords.sort((a, b) => a.preference - b.preference);\n return { type, records: mxRecords };\n }\n \n // Clean trailing dots from records\n const records = filtered.map((a: any) => \n String(a.data).replace(/\\.$/, \"\").replace(/^\"|\"$/g, \"\")\n );\n \n return { type, records };\n } catch (e) {\n return { type, records: [], error: e instanceof Error ? e.message : String(e) };\n }\n}\n\nexport async function resolveDns(\n domain: string,\n types: RecordType[]\n): Promise {\n const cleanDomain = domain.trim().toLowerCase()\n .replace(/^https?:\\/\\//, \"\")\n .replace(/\\/.*$/, \"\")\n .replace(/\\.$/, \"\"); // remove trailing dot if present\n \n if (!cleanDomain || !/^[a-z0-9]([a-z0-9-]*[a-z0-9])?(\\.[a-z0-9]([a-z0-9-]*[a-z0-9])?)*$/i.test(cleanDomain)) {\n return {\n domain: cleanDomain,\n timestamp: new Date().toISOString(),\n results: [{ type: \"A\", records: [], error: \"Invalid domain format\" }],\n };\n }\n\n const results = await Promise.all(types.map(type => dohQuery(cleanDomain, type)));\n\n return {\n domain: cleanDomain,\n timestamp: new Date().toISOString(),\n results,\n };\n}\n",[],[161,189],{"_105":196,"_97":197,"_162":198,"_164":163,"_165":147,"_166":199,"_168":120,"_107":200,"_102":33,"_170":183,"_172":201,"_173":22,"_174":-5,"_175":202,"_100":203},"c111f2a8-f2f7-11f0-a746-42dde27851f2","types.ts","c111f352-f2f7-11f0-a746-42dde27851f2",2,["D",1768580635844],"export type RecordType = \"A\" | \"AAAA\" | \"MX\" | \"CNAME\" | \"TXT\" | \"NS\";\n\nexport const RECORD_TYPES: RecordType[] = [\"A\", \"AAAA\", \"MX\", \"CNAME\", \"TXT\", \"NS\"];\n\nexport interface MXRecord {\n preference: number;\n exchange: string;\n}\n\nexport interface RecordResult {\n type: RecordType;\n records: string[] | MXRecord[];\n error?: string;\n ttl?: number;\n}\n\nexport interface LookupResult {\n domain: string;\n timestamp: string;\n results: RecordResult[];\n}\n\nexport const RECORD_DESCRIPTIONS: Record = {\n A: \"IPv4 address\",\n AAAA: \"IPv6 address\", \n MX: \"Mail exchange servers\",\n CNAME: \"Canonical name (alias)\",\n TXT: \"Text records (SPF, DKIM, etc)\",\n NS: \"Name servers\",\n};\n",[],[161,197],[161],{"_105":206,"_97":207,"_162":118,"_164":-5,"_165":147,"_166":208,"_168":120,"_107":209,"_102":33,"_170":210,"_172":211,"_173":22,"_174":-5,"_175":212,"_100":213},"e27d395c-f2f7-11f0-b41d-42dde27851f2","main.ts",5,["D",1768580691914],"http","import { renderPage } from \"./lib/renderer.ts\";\nimport { resolveDns } from \"./lib/resolver.ts\";\nimport type { RecordType } from \"./lib/types.ts\";\n\nconst VALID_TYPES = [\"A\", \"AAAA\", \"MX\", \"CNAME\", \"TXT\", \"NS\"];\n\nexport default async function handler(req: Request): Promise {\n const url = new URL(req.url);\n const domain = url.searchParams.get(\"domain\");\n const typesParam = url.searchParams.get(\"types\");\n const format = url.searchParams.get(\"format\");\n\n const types = typesParam\n ? typesParam.split(\",\").filter(t => VALID_TYPES.includes(t)) as RecordType[]\n : [\"A\", \"MX\", \"CNAME\"] as RecordType[];\n\n // JSON API\n if (format === \"json\") {\n if (!domain) {\n return Response.json({ error: \"Missing domain parameter\" }, { status: 400 });\n }\n const result = await resolveDns(domain, types);\n return Response.json(result, {\n headers: { \"Access-Control-Allow-Origin\": \"*\" },\n });\n }\n\n // HTML UI\n return new Response(renderPage(domain || undefined, types), {\n headers: { \"Content-Type\": \"text/html; charset=utf-8\" },\n });\n}\n",[],[207],"files",[159,177,187,195,205],"counts",{"_218":33,"_219":167,"_220":33,"_221":222,"_225":226},"pulls","branches","forks","envVars",{"_223":33,"_224":33},"count","emptyCount","connections",{"_223":33,"_227":33},"unfilledCount","contents",[],"file",{"_105":188,"_165":147,"_162":190,"_97":189,"_172":192,"_170":183,"_102":167,"_164":163,"_107":232,"_166":146,"_174":-5,"_100":233},["D",1768581116129],[161,189],"upstreamProject","upstreamBranch","emptyEnvVars","isNew","flags",[],"routes/_app.x.$handle.$name.branch.$branch.history_.$",{"_95":96,"_97":98,"_99":45,"_100":101,"_103":242,"_230":247,"_250":251,"_259":260,"_264":-7,"_265":33,"_266":22},{"_105":106,"_97":98,"_107":243,"_109":-5,"_110":22,"_111":112,"_113":114,"_115":-5,"_14":116,"_117":118,"_119":120,"_121":-5,"_122":-5,"_123":33,"_16":124,"_125":-5,"_126":-5,"_127":128,"_129":128,"_130":131,"_132":131,"_133":131,"_134":128,"_135":128,"_23":244,"_139":245,"_144":246,"_156":22},["D",1768580619105],{"_95":96,"_137":138},{"_95":96,"_141":138,"_14":116,"_142":143},{"_102":146,"_97":45,"_105":147,"_148":106,"_149":-5,"_150":-5,"_151":-5,"_152":-5,"_153":-5,"_154":98,"_155":96},{"_105":188,"_97":189,"_162":190,"_164":163,"_165":147,"_166":146,"_168":120,"_107":248,"_102":167,"_170":183,"_172":192,"_173":22,"_174":-5,"_100":249},["D",1768581116129],[161,189],"history",[252,254],{"_105":188,"_165":147,"_162":190,"_97":189,"_172":192,"_170":183,"_102":167,"_164":163,"_107":253,"_166":146,"_174":-5},["D",1768581116129],{"_105":255,"_165":147,"_162":190,"_97":189,"_172":256,"_170":183,"_102":33,"_164":163,"_107":257,"_166":258,"_174":-5},"c765a0b4-f2f7-11f0-ad56-42dde27851f2","import type { RecordType, RecordResult, LookupResult, MXRecord } from \"./types.ts\";\n\nexport async function resolveDns(\n domain: string,\n types: RecordType[]\n): Promise {\n const cleanDomain = domain.trim().toLowerCase().replace(/^https?:\\/\\//, \"\").replace(/\\/.*$/, \"\");\n \n if (!cleanDomain || !/^[a-z0-9]([a-z0-9-]*[a-z0-9])?(\\.[a-z0-9]([a-z0-9-]*[a-z0-9])?)*$/.test(cleanDomain)) {\n return {\n domain: cleanDomain,\n timestamp: new Date().toISOString(),\n results: [{ type: \"A\", records: [], error: \"Invalid domain format\" }],\n };\n }\n\n const results: RecordResult[] = await Promise.all(\n types.map(async (type): Promise => {\n try {\n const records = await Deno.resolveDns(cleanDomain, type);\n \n if (type === \"MX\") {\n const mxRecords = (records as Deno.MXRecord[]).map(r => ({\n preference: r.preference,\n exchange: r.exchange,\n }));\n mxRecords.sort((a, b) => a.preference - b.preference);\n return { type, records: mxRecords };\n }\n \n return { type, records: records as string[] };\n } catch (e) {\n const msg = e instanceof Error ? e.message : String(e);\n if (msg.includes(\"no records\") || msg.includes(\"NXDOMAIN\") || msg.includes(\"not found\")) {\n return { type, records: [] };\n }\n return { type, records: [], error: msg };\n }\n })\n );\n\n return {\n domain: cleanDomain,\n timestamp: new Date().toISOString(),\n results,\n };\n}\n",["D",1768580646456],3,"versions",[261,263],{"_230":252,"_262":254},"previous",{"_230":254,"_262":-5},"versionNumber","page","hasNext","actionData","errors"]

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dns-lookup

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