diff --git a/server.go b/server.go
index 2743a3a..cf3f524 100644
--- a/server.go
+++ b/server.go
@@ -120,31 +120,32 @@ func (sv *Server) dispatch() {
 			sv.recvMsg(msg)
 			sv.packetsTransferred++
 		case cl := <-sv.AddClient:
-			nick := cl.Name()
-			if _, exists := sv.clients[nick]; exists {
+			lnick := strings.ToLower(cl.Name())
+			if _, exists := sv.clients[lnick]; exists {
 				cl.Register(false)
-				xlog.Info("Client registration failed: '%s'", nick)
+				xlog.Info("Client registration failed: '%s'", lnick)
 			} else {
-				sv.clients[nick] = cl
-				sv.sendLogon(cl.Name())
+				sv.clients[lnick] = cl
+				sv.sendLogon(lnick)
 				sv.connectionsCurrent = float64(len(sv.clients))
 				cl.Register(true)
-				xlog.Info("Client registered: '%s'", nick)
+				xlog.Info("Client registered: '%s'", lnick)
 				xlog.Info("Server has %d client(s)", len(sv.clients))
 				xlog.Debug("Goroutines running: %d", runtime.NumGoroutine())
 			}
 		case cl := <-sv.DelClient:
 			nick := cl.Name()
+			lnick := strings.ToLower(nick)
 			cl.Destroy()
 			for chname, ch := range sv.chUsers {
-				if _, exists := ch[nick]; exists {
-					delete(ch, nick)
+				if _, exists := ch[lnick]; exists {
+					delete(ch, lnick)
 					sv.sendMsg(irc.M(nick, "PART", chname, "quit"))
 				}
 			}
-			delete(sv.clients, nick)
+			delete(sv.clients, lnick)
 			sv.connectionsCurrent = float64(len(sv.clients))
-			xlog.Info("Client deleted: '%s'", nick)
+			xlog.Info("Client deleted: '%s'", lnick)
 			xlog.Info("Server has %d client(s)", len(sv.clients))
 			xlog.Debug("Goroutines running: %d", runtime.NumGoroutine())
 		default:
@@ -182,34 +183,36 @@ func (sv *Server) recvMsg(msg *irc.Message) {
 
 func (sv *Server) sendMsg(msg *irc.Message) {
 	if strings.HasPrefix(msg.Args[0], "#") {
-		ch := msg.Args[0]
-		if _, exists := sv.chUsers[ch]; !exists {
+		lch := strings.ToLower(msg.Args[0])
+		if _, exists := sv.chUsers[lch]; !exists {
 			sv.sendReply(msg.Pre, ERR_NOSUCHNICK, msg.Args[0], "No such nick/channel")
 			return
 		}
-		for nick, _ := range sv.chUsers[ch] {
-			if msg.Pre == nick && msg.Cmd == "PRIVMSG" {
+		for lnick, _ := range sv.chUsers[lch] {
+			if strings.ToLower(msg.Pre) == lnick && msg.Cmd == "PRIVMSG" {
 				continue
 			}
-			if cl, exists := sv.clients[nick]; exists {
+			if cl, exists := sv.clients[lnick]; exists {
 				cl.Receive(msg)
 			}
 		}
 	} else {
-		if _, exists := sv.clients[msg.Args[0]]; !exists {
+		lnick := strings.ToLower(msg.Args[0])
+		if _, exists := sv.clients[lnick]; !exists {
 			sv.sendReply(msg.Pre, ERR_NOSUCHNICK, msg.Args[0], "No such nick/channel")
 			return
 		}
-		cl := sv.clients[msg.Args[0]]
+		cl := sv.clients[lnick]
 		cl.Receive(msg)
 	}
 }
 
 func (sv *Server) sendReply(tar, cmd, args, trail string) {
-	if _, exists := sv.clients[tar]; !exists {
+	lnick := strings.ToLower(tar)
+	if _, exists := sv.clients[lnick]; !exists {
 		return
 	}
-	cl := sv.clients[tar]
+	cl := sv.clients[lnick]
 	if args != "" {
 		args = tar + " " + args
 	} else {
@@ -238,40 +241,46 @@ func (sv *Server) sendLogon(nick string) {
 }
 
 func (sv *Server) channelJoin(nick, ch string) {
-	if _, exists := sv.chUsers[ch]; !exists {
-		sv.chUsers[ch] = make(map[string]string)
-		sv.chTopics[ch] = ""
+	lnick := strings.ToLower(nick)
+	lch := strings.ToLower(ch)
+	if _, exists := sv.chUsers[lch]; !exists {
+		sv.chUsers[lch] = make(map[string]string)
+		sv.chTopics[lch] = ""
 	}
-	if _, exists := sv.chUsers[ch][nick]; exists {
+	if _, exists := sv.chUsers[lch][lnick]; exists {
 		return
 	}
-	sv.chUsers[ch][nick] = ""
+	sv.chUsers[lch][lnick] = ""
 	sv.sendMsg(irc.M(nick, "JOIN", ch, ""))
 	sv.sendReply(nick, RPL_TOPIC, ch, sv.chTopics[ch])
 	sv.channelNames(nick, ch)
 }
 
 func (sv *Server) channelPart(nick, ch, reason string) {
-	if _, exists := sv.chUsers[ch]; !exists {
+	lnick := strings.ToLower(nick)
+	lch := strings.ToLower(nick)
+	if _, exists := sv.chUsers[lch]; !exists {
 		return
 	}
-	if _, exists := sv.chUsers[ch][nick]; !exists {
+	if _, exists := sv.chUsers[lch][lnick]; !exists {
 		return
 	}
 	sv.sendMsg(irc.M(nick, "PART", ch, reason))
-	delete(sv.chUsers[ch], nick)
+	delete(sv.chUsers[lch], lnick)
 }
 
 func (sv *Server) channelNames(nick, ch string) {
-	if _, exists := sv.chUsers[ch]; !exists {
+	lch := strings.ToLower(ch)
+	if _, exists := sv.chUsers[lch]; !exists {
 		return
 	}
 	names := ""
-	for name, mode := range sv.chUsers[ch] {
+	for lnick, mode := range sv.chUsers[lch] {
+		nick := sv.clients[lnick].Name()
 		if names != "" {
 			names += " "
 		}
-		names = names + mode + name
+		names = names + mode + nick
 	}
 	sv.sendReply(nick, RPL_NAMEREPLY, "= "+ch, names)
 	sv.sendReply(nick, RPL_ENDOFNAMES, ch, "End of /NAMES list")