diff --git a/NTPClient.cpp b/NTPClient.cpp
index f2d484f..b4f73e5 100755
--- a/NTPClient.cpp
+++ b/NTPClient.cpp
@@ -37,16 +37,23 @@ NTPClient::NTPClient(UDP& udp, const char* poolServerName) {
 
 NTPClient::NTPClient(UDP& udp, IPAddress poolServerIP) {
   this->_udp            = &udp;
-  this->_poolServerIP = poolServerIP;
+  this->_poolServerIP   = poolServerIP;
   this->_poolServerName = NULL;
 }
 
-NTPClient::NTPClient(UDP& udp, const char* poolServerName, int timeOffset) {
+NTPClient::NTPClient(UDP& udp, const char* poolServerName, long timeOffset) {
   this->_udp            = &udp;
   this->_timeOffset     = timeOffset;
   this->_poolServerName = poolServerName;
 }
 
+NTPClient::NTPClient(UDP& udp, IPAddress poolServerIP, long timeOffset){
+  this->_udp            = &udp;
+  this->_timeOffset     = timeOffset;
+  this->_poolServerIP   = poolServerIP;
+  this->_poolServerName = NULL;
+}
+
 NTPClient::NTPClient(UDP& udp, const char* poolServerName, long timeOffset, unsigned long updateInterval) {
   this->_udp            = &udp;
   this->_timeOffset     = timeOffset;
@@ -54,6 +61,14 @@ NTPClient::NTPClient(UDP& udp, const char* poolServerName, long timeOffset, unsi
   this->_updateInterval = updateInterval;
 }
 
+NTPClient::NTPClient(UDP& udp, IPAddress poolServerIP, long timeOffset, unsigned long updateInterval) {
+  this->_udp            = &udp;
+  this->_timeOffset     = timeOffset;
+  this->_poolServerIP   = poolServerIP;
+  this->_poolServerName = NULL;
+  this->_updateInterval = updateInterval;
+}
+
 void NTPClient::begin() {
   this->begin(NTP_DEFAULT_LOCAL_PORT);
 }
diff --git a/NTPClient.h b/NTPClient.h
index 08c6ee1..5a8c96c 100755
--- a/NTPClient.h
+++ b/NTPClient.h
@@ -30,9 +30,11 @@ class NTPClient {
     NTPClient(UDP& udp);
     NTPClient(UDP& udp, long timeOffset);
     NTPClient(UDP& udp, const char* poolServerName);
-    NTPClient(UDP& udp, IPAddress poolServerIP);
     NTPClient(UDP& udp, const char* poolServerName, long timeOffset);
     NTPClient(UDP& udp, const char* poolServerName, long timeOffset, unsigned long updateInterval);
+    NTPClient(UDP& udp, IPAddress poolServerIP);
+    NTPClient(UDP& udp, IPAddress poolServerIP, long timeOffset);
+    NTPClient(UDP& udp, IPAddress poolServerIP, long timeOffset, unsigned long updateInterval);
 
     /**
      * Set time server name