diff --git a/lib/netutils/netutils.c b/lib/netutils/netutils.c
new file mode 100644
index 0000000..ac4ebfa
--- /dev/null
+++ b/lib/netutils/netutils.c
@@ -0,0 +1,95 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2013, 2014 Damien P. George
+ * Copyright (c) 2015 Daniel Campora
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "py/obj.h"
+#include "py/nlr.h"
+#include "netutils.h"
+
+// Takes an array with a raw IPv4 address and returns something like '192.168.0.1'.
+mp_obj_t netutils_format_ipv4_addr(uint8_t *ip, netutils_endian_t endian) {
+    char ip_str[16];
+    mp_uint_t ip_len;
+    if (endian == NETUTILS_LITTLE) {
+        ip_len = snprintf(ip_str, 16, "%u.%u.%u.%u", ip[3], ip[2], ip[1], ip[0]);
+    } else {
+        ip_len = snprintf(ip_str, 16, "%u.%u.%u.%u", ip[0], ip[1], ip[2], ip[3]);
+    }
+    return mp_obj_new_str(ip_str, ip_len, false);
+}
+
+// Takes an array with a raw IP address, and a port, and returns a net-address
+// tuple such as ('192.168.0.1', 8080).
+mp_obj_t netutils_format_inet_addr(uint8_t *ip, mp_uint_t port, netutils_endian_t endian) {
+    mp_obj_t tuple[2] = {
+        tuple[0] = netutils_format_ipv4_addr(ip, endian),
+        tuple[1] = mp_obj_new_int(port),
+    };
+    return mp_obj_new_tuple(2, tuple);
+}
+
+void netutils_parse_ipv4_addr(mp_obj_t addr_in, uint8_t *out_ip, netutils_endian_t endian) {
+    mp_uint_t addr_len;
+    const char *addr_str = mp_obj_str_get_data(addr_in, &addr_len);
+    if (addr_len == 0) {
+        // special case of no address given
+        memset(out_ip, 0, NETUTILS_IPV4ADDR_BUFSIZE);
+        return;
+    }
+    const char *s = addr_str;
+    const char *s_top = addr_str + addr_len;
+    for (mp_uint_t i = 3 ; ; i--) {
+        mp_uint_t val = 0;
+        for (; s < s_top && *s != '.'; s++) {
+            val = val * 10 + *s - '0';
+        }
+        if (endian == NETUTILS_LITTLE) {
+            out_ip[i] = val;
+        } else {
+            out_ip[NETUTILS_IPV4ADDR_BUFSIZE - 1 - i] = val;
+        }
+        if (i == 0 && s == s_top) {
+            return;
+        } else if (i > 0 && s < s_top && *s == '.') {
+            s++;
+        } else {
+            nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "invalid arguments"));
+        }
+    }
+}
+
+// Takes an address of the form ('192.168.0.1', 8080), returns the port and
+// puts IP in out_ip (which must take at least IPADDR_BUF_SIZE bytes).
+mp_uint_t netutils_parse_inet_addr(mp_obj_t addr_in, uint8_t *out_ip, netutils_endian_t endian) {
+    mp_obj_t *addr_items;
+    mp_obj_get_array_fixed_n(addr_in, 2, &addr_items);
+    netutils_parse_ipv4_addr(addr_items[0], out_ip, endian);
+    return mp_obj_get_int(addr_items[1]);
+}
diff --git a/lib/netutils/netutils.h b/lib/netutils/netutils.h
new file mode 100644
index 0000000..45e0216
--- /dev/null
+++ b/lib/netutils/netutils.h
@@ -0,0 +1,50 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2013, 2014 Damien P. George
+ * Copyright (c) 2015 Daniel Campora
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#ifndef __MICROPY_INCLUDED_LIB_NETUTILS_H__
+#define __MICROPY_INCLUDED_LIB_NETUTILS_H__
+
+#define NETUTILS_IPV4ADDR_BUFSIZE    4
+
+typedef enum _netutils_endian_t {
+    NETUTILS_LITTLE,
+    NETUTILS_BIG,
+} netutils_endian_t;
+
+// Takes an array with a raw IPv4 address and returns something like '192.168.0.1'.
+mp_obj_t netutils_format_ipv4_addr(uint8_t *ip, netutils_endian_t endian);
+
+// Takes an array with a raw IP address, and a port, and returns a net-address
+// tuple such as ('192.168.0.1', 8080).
+mp_obj_t netutils_format_inet_addr(uint8_t *ip, mp_uint_t port, netutils_endian_t endian);
+
+void netutils_parse_ipv4_addr(mp_obj_t addr_in, uint8_t *out_ip, netutils_endian_t endian);
+
+// Takes an address of the form ('192.168.0.1', 8080), returns the port and
+// puts IP in out_ip (which must take at least IPADDR_BUF_SIZE bytes).
+mp_uint_t netutils_parse_inet_addr(mp_obj_t addr_in, uint8_t *out_ip, netutils_endian_t endian);
+
+#endif // __MICROPY_INCLUDED_LIB_NETUTILS_H__