--- a/src/dnsbl.cpp	Wed Jul 26 09:02:22 2017 -0700
+++ b/src/dnsbl.cpp	Fri Aug 18 09:11:35 2017 -0700
@@ -1151,6 +1151,11 @@
         if ((count > limit) && (limit > 0)) return false;   // too many name servers to check them all
         host = (*i).first;  // a transient reference that needs to be replaced before we return it
         ip   = (*i).second;
+
+        // don't bother looking up nameserver names on the ignore list
+        string_set::iterator j = ignore.find(host);
+        if (j != ignore.end()) continue;
+
         if (!ip) ip = dns_interface(priv, host, ns_t_a);
         if (debug_syslog > 2) {
             char buf[maxlen];