diff --git a/src/core/ngx_inet.c b/src/core/ngx_inet.c
index c6f36fe..326383b 100644
--- a/src/core/ngx_inet.c
+++ b/src/core/ngx_inet.c
@@ -643,20 +643,21 @@
         return NGX_OK;
     }
 
-    if (len++) {
-
-        p = ngx_alloc(len, pool->log);
-        if (p == NULL) {
-            return NGX_ERROR;
-        }
-
-        (void) ngx_cpystrn(p, host, len);
-
-        sin->sin_addr.s_addr = inet_addr((const char *) p);
+    if (len) {
+        sin->sin_addr.s_addr = ngx_inet_addr(host, len);
 
         if (sin->sin_addr.s_addr == INADDR_NONE) {
+            p = ngx_alloc(++len, pool->log);
+            if (p == NULL) {
+                return NGX_ERROR;
+            }
+
+            (void) ngx_cpystrn(p, host, len);
+
             h = gethostbyname((const char *) p);
 
+            ngx_free(p);
+
             if (h == NULL || h->h_addr_list[0] == NULL) {
                 ngx_free(p);
                 u->err = "host not found";
@@ -670,8 +671,6 @@
             u->wildcard = 1;
         }
 
-        ngx_free(p);
-
     } else {
         sin->sin_addr.s_addr = INADDR_ANY;
         u->wildcard = 1;
@@ -815,20 +814,20 @@
     struct hostent      *h;
     struct sockaddr_in  *sin;
 
-    host = ngx_alloc(u->host.len + 1, pool->log);
-    if (host == NULL) {
-        return NGX_ERROR;
-    }
-
-    (void) ngx_cpystrn(host, u->host.data, u->host.len + 1);
-
     /* AF_INET only */
 
     port = htons(u->port);
 
-    in_addr = inet_addr((char *) host);
+    in_addr = ngx_inet_addr(u->host.data, u->host.len);
 
     if (in_addr == INADDR_NONE) {
+        host = ngx_alloc(u->host.len + 1, pool->log);
+        if (host == NULL) {
+            return NGX_ERROR;
+        }
+
+        (void) ngx_cpystrn(host, u->host.data, u->host.len + 1);
+
         h = gethostbyname((char *) host);
 
         ngx_free(host);
@@ -883,8 +882,6 @@
 
     } else {
 
-        ngx_free(host);
-
         /* MP: ngx_shared_palloc() */
 
         u->addrs = ngx_pcalloc(pool, sizeof(ngx_peer_addr_t));
diff --git a/src/http/modules/ngx_http_realip_module.c b/src/http/modules/ngx_http_realip_module.c
index 3b2cce6..927893b 100644
--- a/src/http/modules/ngx_http_realip_module.c
+++ b/src/http/modules/ngx_http_realip_module.c
@@ -226,7 +226,7 @@
 
             ngx_http_set_ctx(r, ctx, ngx_http_realip_module);
 
-            addr = inet_addr((char *) ip);
+            addr = ngx_inet_addr(ip, len);
 
             if (addr == INADDR_NONE) {
                 return NGX_DECLINED;
diff --git a/src/mail/ngx_mail_auth_http_module.c b/src/mail/ngx_mail_auth_http_module.c
index acd0665..a27b116 100644
--- a/src/mail/ngx_mail_auth_http_module.c
+++ b/src/mail/ngx_mail_auth_http_module.c
@@ -795,8 +795,7 @@
 
             sin->sin_port = htons((in_port_t) port);
 
-            ctx->addr.data[ctx->addr.len] = '\0';
-            sin->sin_addr.s_addr = inet_addr((char *) ctx->addr.data);
+            sin->sin_addr.s_addr = ngx_inet_addr(ctx->addr.data, ctx->addr.len);
             if (sin->sin_addr.s_addr == INADDR_NONE) {
                 ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
                               "auth http server %V sent invalid server "