diff --git a/src/server/main.c b/src/server/main.c
index fe2fd58..356576a 100644
--- a/src/server/main.c
+++ b/src/server/main.c
@@ -1,7 +1,7 @@
 #include <stdio.h>
+#include "util/ipaddr.h"
 
 int main(int argc, char** argv) {
-    printf("allo");
-
+    ipaddr_t test = glv_ip_aton("192.168.1.150/24");
     return 0;
 }
\ No newline at end of file
diff --git a/src/server/sock/tcp.h b/src/server/sock/tcp.h
index 268da0f..76fd021 100644
--- a/src/server/sock/tcp.h
+++ b/src/server/sock/tcp.h
@@ -44,7 +44,7 @@ typedef struct {
 glv_tcp_t* glv_tcp_create_server();
 glv_tcp_t* glv_tcp_create_client();
 
-int glv_tcp_send(glv_tcp_t* sock, char* data, unsigned int length);
+int glv_tcp_send(glv_tcp_t* sock, const char* data, unsigned int length);
 int glv_tcp_recv(glv_tcp_t* sock, char* data, unsigned int length, int flags);
 
 int glv_tcp_data_ready(glv_tcp_t* sock);
diff --git a/src/server/util/ipaddr.c b/src/server/util/ipaddr.c
index bedff16..6460f17 100644
--- a/src/server/util/ipaddr.c
+++ b/src/server/util/ipaddr.c
@@ -1,2 +1,72 @@
 #include "ipaddr.h"
 
+const ipaddr_t error_addr = {{0, 0, 0, 0, 0, 0, 0, 0}, -1};
+
+ipaddr_t glv_ip_aton(const char* addr) {
+    ipaddr_t addr_out = {{0, 0, 0, 0, 0, 0, 0, 0}, 0};
+    char token[5] = {0, 0, 0, 0, 0};
+    const int length = strlen(addr);
+    int i, j = 0, k = 0, tmp;
+
+    if(strchr(addr, ':') != NULL && strchr(addr, '.') != NULL)
+        return error_addr;
+    if(strcnt(addr, '/') > 1)
+        return error_addr;
+
+    if(strchr(addr, '.') != NULL) {
+        if(strcnt(addr, '.') != 3)
+            return error_addr;
+
+        addr_out.addr[5] = 0xFFFF;
+        for(i = 0; i < length; ++i) {
+            if(addr[i] == ' ')
+                continue;
+            else if(addr[i] == '.' || addr[i] == '/' || i == length - 1) {
+                if(j == 0)
+                    return error_addr;
+
+                token[j] = 0;
+                if((tmp = atoi(token)) > 255)
+                    return error_addr;
+
+                if(k < 4) {
+                    addr_out.addr[6 + (k / 2)] |=
+                        (tmp << (k % 2 == 0 ? 8 : 0));
+                    j = 0;
+                    ++k;
+                } else {
+                    if(tmp > 32)
+                        return error_addr;
+                    addr_out.cidr = tmp;
+                }
+
+                if(addr[i] == '/' && k != 4)
+                    return error_addr;
+            } else if(addr[i] >= '0' && addr[i] <= '9') {
+                if(j == 3)
+                    return error_addr;
+                token[j++] = addr[i];
+            } else
+                return error_addr;
+        }
+    } else {
+        if(strcnt(addr, ':') > 7)
+            return error_addr;
+
+
+    }
+
+    return addr_out;
+}
+
+ipaddr_t glv_ip_raw(const uint16_t* addr, uint8_t cidr) {
+    ipaddr_t addr_out;
+    memcpy(addr_out.addr, addr, 16);
+    addr_out.cidr = cidr;
+
+    return addr_out;
+}
+
+int glv_ip_valid(const ipaddr_t* addr) {
+    return addr->cidr == -1;
+}
\ No newline at end of file
diff --git a/src/server/util/ipaddr.h b/src/server/util/ipaddr.h
index 2967d56..1020082 100644
--- a/src/server/util/ipaddr.h
+++ b/src/server/util/ipaddr.h
@@ -1,20 +1,26 @@
 #ifndef GLV_UTIL_IPADDR_H
 #define GLV_UTIL_IPADDR_H
 
+#include "util/string.h"
+#include <string.h>
 #include <stdint.h>
+#include <stdlib.h>
 
 typedef struct {
-    uint8_t addr[16];
+    uint16_t addr[8];
     uint8_t cidr;
 } ipaddr_t;
 
-ipaddr_t glv_ip_aton(char* addr, int length);
-ipaddr_t glv_ip_raw(uint8_t* addr, uint8_t cidr);
+ipaddr_t glv_ip_aton(const char* addr);
+ipaddr_t glv_ip_raw(const uint16_t* addr, uint8_t cidr);
+int glv_ip_check(const char* addr);
 
-int glv_ip_compare(ipaddr_t* lhs, ipaddr_t* rhs);
-int glv_ip_identical(ipaddr_t* lhs, ipaddr_t* rhs);
-int glv_ip_isv4(ipaddr_t* addr);
+int glv_ip_compare(const ipaddr_t* lhs, const ipaddr_t* rhs);
+int glv_ip_identical(const ipaddr_t* lhs, const ipaddr_t* rhs);
+int glv_ip_isv4(const ipaddr_t* addr);
+int glv_ip_valid(const ipaddr_t* addr);
 
-int glv_ip_ntoa(ipaddr_t* addr, char* out);
+int glv_ip_ntoa(const ipaddr_t* addr, char* out);
+int glv_ipv6_ntoa(const ipaddr_t* addr, char* out);
 
 #endif
\ No newline at end of file
diff --git a/src/server/util/string.c b/src/server/util/string.c
new file mode 100644
index 0000000..c8d2227
--- /dev/null
+++ b/src/server/util/string.c
@@ -0,0 +1,25 @@
+#include "string.h"
+
+int hatoi(const char* str) {
+    int value = 0, i;
+    for(i = 0; i < strlen(str); ++i) {
+        value *= 16;
+        if(str[i] >= '0' && str[i] <= '9')
+            value += str[i] - '0';
+        else if(str[i] >= 'a' && str[i] <= 'f')
+            value += (str[i] - 'a') + 10;
+        else if(str[i] >= 'A' && str[i] <= 'F')
+            value += (str[i] - 'A') + 10;
+    }
+
+    return value;
+}
+
+int strcnt(const char* str, char c) {
+    int cnt = 0, i;
+    for(i = 0; i < strlen(str); ++i)
+        if(str[i] == c)
+            ++cnt;
+
+    return cnt;
+}
\ No newline at end of file
diff --git a/src/server/util/string.h b/src/server/util/string.h
new file mode 100644
index 0000000..62837f6
--- /dev/null
+++ b/src/server/util/string.h
@@ -0,0 +1,9 @@
+#ifndef GLV_UTIL_STRING_H
+#define GLV_UTIL_STRING_H
+
+#include <string.h>
+
+int hatoi(const char* str);
+int strcnt(const char* str, char c);
+
+#endif