--- a/dns_rcip.c
+++ b/dns_rcip.c
@@ -17,7 +17,7 @@ static int init(char ip[64])
   x = env_get("DNSCACHEIP");
   if (x)
     while (iplen <= 60) {
-      if (*x == '.')
+      if (*x == ' ' || *x == '\t' || *x == '\n')
 	++x;
       else {
         i = ip4_scan(x,ip + iplen);
