functionNSLookup(type,domain,useCache=false,minCacheTTL=30){
if (typeoftype=='undefined'){
thrownewError('Missing parameter 1 dns type');
}
if (typeofdomain=='undefined'){
thrownewError('Missing parameter 2 domain name');
}
if (typeofuseCache!="boolean"){
thrownewError('Only boolean values allowed in 3 use cache');
}
if (typeofminCacheTTL!="number"){
thrownewError('Only numeric values allowed in 4 min cache ttl');
}
type=type.toUpperCase();
domain=domain.toLowerCase();
letcache= null;
if (useCache){
// Cache key and hash
cacheKey=domain+"@"+type;
cacheHash=Utilities.base64Encode(cacheKey);
cacheBinKey="nslookup-result-"+cacheHash;
cache=CacheService.getScriptCache();
constcachedResult=cache.get(cacheBinKey);
if (cachedResult!=null){
returncachedResult;
}
}
consturl='https://cloudflare-dns.com/dns-query?name='+encodeURIComponent(domain)+'&type='+encodeURIComponent(type);
constoptions={
muteHttpExceptions: true,
headers:{
accept:"application/dns-json"
}
};
constresult=UrlFetchApp.fetch(url,options);
constrc=result.getResponseCode();
constresultText=result.getContentText();
if (rc!==200){
thrownewError(rc);
}
consterrors= [
{ name:"NoError", description:"No Error"},// 0
{ name:"FormErr", description:"Format Error"},// 1
{ name:"ServFail", description:"Server Failure"},// 2
{ name:"NXDomain", description:"Non-Existent Domain"},// 3
{ name:"NotImp", description:"Not Implemented"},// 4
{ name:"Refused", description:"Query Refused"},// 5
{ name:"YXDomain", description:"Name Exists when it should not"},// 6
{ name:"YXRRSet", description:"RR Set Exists when it should not"},// 7
{ name:"NXRRSet", description:"RR Set that should exist does not"},// 8
{ name:"NotAuth", description:"Not Authorized"}// 9
];
constresponse=JSON.parse(resultText);
if (response.Status!==0){
returnerrors[response.Status].name;
}
constoutputData= [];
letcacheTTL=0;
for (constiinresponse.Answer){
outputData.push(response.Answer[i].data);
constttl=response.Answer[i].TTL;
cacheTTL=Math.min(cacheTTL||ttl,ttl);
}
constoutputString=outputData.join(',');
if (useCache){
cache.put(cacheBinKey,outputString,Math.max(cacheTTL,minCacheTTL));
}
returnoutputString;
}

NSLookup(B1, B2)

NSLookup(B1; B2)

198.41.214.162, 198.41.215.162