diff -r 42c07ecb0ddc -r b765f146f4dc src/luan/modules/Io.luan
--- a/src/luan/modules/Io.luan	Tue Jan 28 01:16:31 2020 -0700
+++ b/src/luan/modules/Io.luan	Wed Feb 05 08:16:15 2020 -0700
@@ -6,6 +6,7 @@
 
 local Io = {}
 
+Io.dns_lookup = IoLuan.dns_lookup
 Io.ip = IoLuan.ip
 Io.my_ips = IoLuan.my_ips
 Io.read_console_line = IoLuan.read_console_line

diff -r 42c07ecb0ddc -r b765f146f4dc src/luan/modules/IoLuan.java
--- a/src/luan/modules/IoLuan.java	Tue Jan 28 01:16:31 2020 -0700
+++ b/src/luan/modules/IoLuan.java	Wed Feb 05 08:16:15 2020 -0700
@@ -28,6 +28,10 @@
 import java.nio.file.Files;
 import java.util.Enumeration;
 import java.util.Map;
+import javax.naming.NamingException;
+import javax.naming.NameNotFoundException;
+import javax.naming.directory.Attribute;
+import javax.naming.directory.InitialDirContext;
 import luan.Luan;
 import luan.LuanTable;
 import luan.LuanFunction;
@@ -673,6 +677,27 @@
 		return tbl;
 	}
 
+	public static LuanTable dns_lookup(Luan luan,String domain,String type)
+		throws NamingException
+	{
+		LuanTable tbl = new LuanTable(luan);
+		InitialDirContext idc = new InitialDirContext();
+		Attribute attribute;
+		try {
+			attribute = idc.getAttributes("dns:/" + domain, new String[] {type}).get(type);
+		} catch(NameNotFoundException e) {
+			return tbl;
+		}
+		if( attribute==null )
+			return tbl;
+		final int n = attribute.size();
+		for( int i=0; i<n; i++ ) {
+			Object obj = attribute.get(i);
+			tbl.rawInsert(i+1,obj);
+		}
+		return tbl;
+	}
+
 
 	private static void check(Luan luan,String name) throws LuanException {
 		Luan.checkSecurity(luan,"uri",name);