diff --git a/README.md b/README.md
index 6bec8a0..571352c 100644
--- a/README.md
+++ b/README.md
@@ -44,6 +44,7 @@ $ ALTCHA_HMAC_KEY="CLÉ HMAC" bin/altcha verify [CHALLENGE] [SALT] [SIGNATURE] [
 ## Variables d'environement
 | Nom                 | Description                                                                  | Valeur par défaut        | Requis |
 |---------------------|------------------------------------------------------------------------------|--------------------------|--------|
+| ALTCHA_HOST         | Adresse de l'hôte                                                            | localhost                | Non    |
 | ALTCHA_PORT         | Port d'écoute du serveur                                                     | 3333                     | Non    |
 | ALTCHA_HMAC_KEY     | Clé d'encodage des signatures                                                |                          | Oui    |
 | ALTCHA_MAX_NUMBER   | Nombre d'itération maximum pour résoudre le challenge (défini la difficulté) | 1000000                  | Non    |
diff --git a/internal/api/server.go b/internal/api/server.go
index 6057a65..f97b51d 100644
--- a/internal/api/server.go
+++ b/internal/api/server.go
@@ -17,10 +17,21 @@ import (
 )
 
 type Server struct {
+	host	string
 	port	string
 	client	client.Client
 }
 
+func NewServer(cfg config.Config) *Server {
+	client := *client.NewClient(cfg.HmacKey, cfg.MaxNumber, cfg.Algorithm, cfg.Salt, cfg.Expire, cfg.CheckExpire)
+
+	return &Server {
+		host:	cfg.Host,
+		port:	cfg.Port,
+		client:	client,
+	}
+}
+
 func (s *Server) Run(ctx context.Context) {
 	r := chi.NewRouter()
 
@@ -37,7 +48,7 @@ func (s *Server) Run(ctx context.Context) {
 	r.Get("/verify-spam-filter", s.submitSpamFilterHandler)
 	
 	logger.Info(ctx, "altcha server listening on port "+s.port)
-	if err := http.ListenAndServe(":"+s.port, r); err != nil {
+	if err := http.ListenAndServe(s.host+":"+s.port, r); err != nil {
 		logger.Error(ctx, err.Error())
 	}
 }
@@ -166,12 +177,3 @@ func formToMap(r *http.Request) (map[string][]string, error) {
 
 	return r.Form, nil
 }
-
-func NewServer(cfg config.Config) *Server {
-	client := *client.NewClient(cfg.HmacKey, cfg.MaxNumber, cfg.Algorithm, cfg.Salt, cfg.Expire, cfg.CheckExpire)
-
-	return &Server {
-		port:	cfg.Port,
-		client:	client,
-	}
-}
\ No newline at end of file
diff --git a/internal/config/config.go b/internal/config/config.go
index 3f33206..979e927 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -1,6 +1,7 @@
 package config
 
 type Config struct {
+	Host		string	`env:"ALTCHA_HOST" envDefault:"localhost"`
 	Port 		string	`env:"ALTCHA_PORT" envDefault:"3333"`
 	HmacKey		string	`env:"ALTCHA_HMAC_KEY"`
 	MaxNumber	int64	`env:"ALTCHA_MAX_NUMBER" envDefault:"1000000"`