diff --git a/kern/devip.c b/kern/devip.c
index 8e60319..0642dcf 100644
--- a/kern/devip.c
+++ b/kern/devip.c
@@ -688,9 +688,11 @@ parseip(char *to, char *from)
 	p = from;
 	memset(to, 0, 4);
 	for(i = 0; i < 4 && *p; i++){
-		to[i] = strtoul(p, &p, 0);
+		to[i] = strtoul(p, &p, 10);
 		if(*p == '.')
 			p++;
+		if(*p != '.' && *p != 0)
+			return 0;
 	}
 	switch(CLASS(to)){
 	case 0:	/* class A - 1 byte net */