diff --git a/modules/api_rest.go b/modules/api_rest.go
index 83ca9c09..4d26e529 100644
--- a/modules/api_rest.go
+++ b/modules/api_rest.go
@@ -29,7 +29,7 @@ func NewRestAPI(s *session.Session) *RestAPI {
 
 	api.AddParam(session.NewStringParameter("api.rest.address",
 		session.ParamIfaceAddress,
-		`^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$`,
+		session.IPv4Validator,
 		"Address to bind the API REST server to."))
 
 	api.AddParam(session.NewIntParameter("api.rest.port",
diff --git a/modules/dhcp6_spoof.go b/modules/dhcp6_spoof.go
index 3011e87e..5b81207f 100644
--- a/modules/dhcp6_spoof.go
+++ b/modules/dhcp6_spoof.go
@@ -46,7 +46,7 @@ func NewDHCP6Spoofer(s *session.Session) *DHCP6Spoofer {
 
 	spoof.AddParam(session.NewStringParameter("dhcp6.spoof.address",
 		session.ParamIfaceAddress,
-		`^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$`,
+		session.IPv4Validator,
 		"IP address to map the domains to."))
 
 	spoof.AddHandler(session.NewModuleHandler("dhcp6.spoof on", "",
diff --git a/modules/dns_spoof.go b/modules/dns_spoof.go
index fabf89ae..e7a56a65 100644
--- a/modules/dns_spoof.go
+++ b/modules/dns_spoof.go
@@ -36,7 +36,7 @@ func NewDNSSpoofer(s *session.Session) *DNSSpoofer {
 
 	spoof.AddParam(session.NewStringParameter("dns.spoof.address",
 		session.ParamIfaceAddress,
-		`^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$`,
+		session.IPv4Validator,
 		"IP address to map the domains to."))
 
 	spoof.AddHandler(session.NewModuleHandler("dns.spoof on", "",
diff --git a/modules/http_proxy.go b/modules/http_proxy.go
index 6043562c..81bbbafd 100644
--- a/modules/http_proxy.go
+++ b/modules/http_proxy.go
@@ -55,7 +55,7 @@ func NewHttpProxy(s *session.Session) *HttpProxy {
 
 	p.AddParam(session.NewStringParameter("http.proxy.address",
 		session.ParamIfaceAddress,
-		`^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$`,
+		session.IPv4Validator,
 		"Address to bind the HTTP proxy to."))
 
 	p.AddParam(session.NewIntParameter("http.proxy.port",
diff --git a/modules/http_server.go b/modules/http_server.go
index a6594fd0..7e55e2bc 100644
--- a/modules/http_server.go
+++ b/modules/http_server.go
@@ -30,7 +30,7 @@ func NewHttpServer(s *session.Session) *HttpServer {
 
 	httpd.AddParam(session.NewStringParameter("http.server.address",
 		session.ParamIfaceAddress,
-		`^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$`,
+		session.IPv4Validator,
 		"Address to bind the http server to."))
 
 	httpd.AddParam(session.NewIntParameter("http.server.port",
diff --git a/session/module_handler.go b/session/module_handler.go
index d7f7f89c..e12db3e4 100644
--- a/session/module_handler.go
+++ b/session/module_handler.go
@@ -7,6 +7,8 @@ import (
 	"strconv"
 )
 
+const IPv4Validator = `^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$`
+
 type ModuleHandler struct {
 	Name        string
 	Description string