diff --git a/src/activitypub/actors/types.rs b/src/activitypub/actors/types.rs
index bb96682..23659a6 100644
--- a/src/activitypub/actors/types.rs
+++ b/src/activitypub/actors/types.rs
@@ -20,6 +20,7 @@ use crate::models::profiles::types::{
 use crate::models::users::types::User;
 use crate::utils::crypto::{deserialize_private_key, get_public_key_pem};
 use crate::utils::files::get_file_url;
+use crate::utils::urls::get_hostname;
 use super::attachments::{
     attach_extra_field,
     attach_identity_proof,
@@ -119,11 +120,8 @@ impl Actor {
     pub fn address(
         &self,
     ) -> Result<ActorAddress, ValidationError> {
-        let hostname = url::Url::parse(&self.id)
-            .map_err(|_| ValidationError("invalid actor ID"))?
-            .host_str()
-            .ok_or(ValidationError("invalid actor ID"))?
-            .to_owned();
+        let hostname = get_hostname(&self.id)
+            .map_err(|_| ValidationError("invalid actor ID"))?;
         let actor_address = ActorAddress {
             username: self.preferred_username.clone(),
             hostname: hostname,
diff --git a/src/utils/mod.rs b/src/utils/mod.rs
index 46ffec1..ab17110 100644
--- a/src/utils/mod.rs
+++ b/src/utils/mod.rs
@@ -5,3 +5,4 @@ pub mod files;
 pub mod html;
 pub mod id;
 pub mod markdown;
+pub mod urls;
diff --git a/src/utils/urls.rs b/src/utils/urls.rs
new file mode 100644
index 0000000..8a334b2
--- /dev/null
+++ b/src/utils/urls.rs
@@ -0,0 +1,41 @@
+use url::{Url, ParseError};
+
+pub fn get_hostname(url: &str) -> Result<String, ParseError> {
+    let hostname = Url::parse(url)?
+        .host_str()
+        .ok_or(ParseError::EmptyHost)?
+        .to_owned();
+    Ok(hostname)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    #[test]
+    fn test_get_hostname() {
+        let url = "https://example.org/objects/1";
+        let hostname = get_hostname(url).unwrap();
+        assert_eq!(hostname, "example.org");
+    }
+
+    #[test]
+    fn test_get_hostname_tor() {
+        let url = "http://2gzyxa5ihm7nsggfxnu52rck2vv4rvmdlkiu3zzui5du4xyclen53wid.onion/objects/1";
+        let hostname = get_hostname(url).unwrap();
+        assert_eq!(hostname, "2gzyxa5ihm7nsggfxnu52rck2vv4rvmdlkiu3zzui5du4xyclen53wid.onion");
+    }
+
+    #[test]
+    fn test_get_hostname_yggdrasil() {
+        let url = "http://[319:3cf0:dd1d:47b9:20c:29ff:fe2c:39be]/objects/1";
+        let hostname = get_hostname(url).unwrap();
+        assert_eq!(hostname, "[319:3cf0:dd1d:47b9:20c:29ff:fe2c:39be]");
+    }
+
+    #[test]
+    fn test_get_hostname_email() {
+        let url = "mailto:user@example.org";
+        let result = get_hostname(url);
+        assert_eq!(result.is_err(), true);
+    }
+}