diff --git a/lib/bcoin/utils.js b/lib/bcoin/utils.js
index e1820fc4..5ee2791f 100644
--- a/lib/bcoin/utils.js
+++ b/lib/bcoin/utils.js
@@ -873,7 +873,7 @@ utils.ip2version = function ip2version(ip, version) {
   var b, i, j;
 
   assert(Buffer.isBuffer(ip));
-  assert(version === 4 || version === 6);
+  assert(version === 4 || version === 6, 'Bad IP version.');
 
   if (version === 4) {
     // Check to see if this an
@@ -953,17 +953,20 @@ utils.ip2version = function ip2version(ip, version) {
 
 utils.ip2array = function ip2array(ip, version) {
   var type = utils.isIP(ip);
+  var parts;
 
-  assert(version === 4 || version === 6);
+  assert(version === 4 || version === 6, 'Bad IP version.');
 
   if (type === 0) {
     if (!Buffer.isBuffer(ip))
       ip = new Buffer([0, 0, 0, 0]);
   } else if (type === 4) {
-    ip = new Buffer(ip.split('.').map(function(n) {
-      return +n;
-    }));
-    assert(ip.length <= 4);
+    parts = ip.split('.');
+    ip = new Buffer(4);
+    ip[0] = +parts[0];
+    ip[1] = +parts[1];
+    ip[2] = +parts[2];
+    ip[3] = +parts[3];
   } else if (type === 6) {
     ip = new Buffer(ip.replace(/:/g, ''), 'hex');
     assert(ip.length <= 16);
@@ -989,7 +992,7 @@ utils.array2ip = function array2ip(ip, version) {
       ip = new Buffer([0, 0, 0, 0]);
   }
 
-  assert(version === 4 || version === 6);
+  assert(version === 4 || version === 6, 'Bad IP version.');
   assert(ip.length <= 16);
 
   ip = utils.ip2version(ip, version);