diff --git a/CONFIGURATION.md b/CONFIGURATION.md
index de5d64d..5802950 100644
--- a/CONFIGURATION.md
+++ b/CONFIGURATION.md
@@ -14,6 +14,10 @@ Address to listen for connections on in the format of `interface:port`.
 
 `localhost:1965`
 
+### Listen on an IPv4 or IPv6 address
+
+`192.0.2.1:1965` or `[2001:db8::1]:1965`
+
 ### Listen on all interfaces
 
 `:1965`
diff --git a/config.go b/config.go
index 20203d4..42b2044 100644
--- a/config.go
+++ b/config.go
@@ -127,13 +127,13 @@ func readconfig(configPath string) error {
 		newLine = "\r\n"
 	}
 
-	split := strings.Split(config.Listen, ":")
-	if len(split) != 2 {
+	listenRe := regexp.MustCompile("(.*):([0-9]+)$")
+	if !listenRe.MatchString(config.Listen) {
 		config.hostname = config.Listen
 		config.Listen += ":1965"
 	} else {
-		config.hostname = split[0]
-		config.port, err = strconv.Atoi(split[1])
+		config.hostname = listenRe.ReplaceAllString(config.Listen, "$1")
+		config.port, err = strconv.Atoi(listenRe.ReplaceAllString(config.Listen, "$2"))
 		if err != nil {
 			log.Fatalf("invalid port specified: %s", err)
 		}