diff --git a/Cargo.toml b/Cargo.toml
index 13b81bc..307a3ca 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "activitystreams"
 description = "A set of core types and traits for activitystreams data"
-version = "0.7.0-alpha.22"
+version = "0.7.0-alpha.23"
 license = "GPL-3.0"
 authors = ["asonix <asonix@asonix.dog>"]
 repository = "https://git.asonix.dog/asonix/activitystreams"
diff --git a/src/activity.rs b/src/activity.rs
index fc2c498..f46e686 100644
--- a/src/activity.rs
+++ b/src/activity.rs
@@ -438,7 +438,7 @@ pub trait AsActivityActorExt: AsActivityActor {
         let actor = self.actor_unchecked();
 
         for any_base in actor {
-            let id = any_base.id().ok_or(CheckError)?;
+            let id = any_base.id().ok_or(CheckError(None))?;
             self.check_authority(id)?;
         }
 
@@ -571,7 +571,7 @@ pub trait AsActivityObjectExt: AsActivityObject {
         let object = self.object_unchecked();
 
         for any_base in object {
-            let id = any_base.id().ok_or(CheckError)?;
+            let id = any_base.id().ok_or(CheckError(None))?;
             self.check_authority(id)?;
         }
 
diff --git a/src/actor.rs b/src/actor.rs
index 2d11c36..8e1734c 100644
--- a/src/actor.rs
+++ b/src/actor.rs
@@ -30,12 +30,23 @@ use crate::{
     primitives::OneOrMany,
     unparsed::{Unparsed, UnparsedMut, UnparsedMutExt},
 };
-use iri_string::types::IriString;
+use iri_string::{components::AuthorityComponents, types::IriString};
 
 pub use activitystreams_kinds::actor as kind;
 
 use self::kind::*;
 
+fn check_opt(
+    iri: &IriString,
+    authority_components: Option<&AuthorityComponents>,
+) -> Result<(), CheckError> {
+    if iri.authority_components().as_ref() == authority_components {
+        Ok(())
+    } else {
+        Err(CheckError(Some(iri.clone())))
+    }
+}
+
 /// Implementation trait for deriving ActivityPub Actor methods for a type
 ///
 /// Any type implementing AsObject will automatically gain methods provided by ApActorExt
@@ -820,36 +831,30 @@ pub trait ApActorExt: AsApActor {
         if let Some(endpoints) = self.endpoints_unchecked() {
             let authority_opt = self.id_unchecked().and_then(|id| id.authority_components());
 
-            let mut any_failed = false;
-
-            any_failed |= endpoints
+            endpoints
                 .proxy_url
-                .map(|u| u.authority_components() != authority_opt)
-                .unwrap_or(false);
-            any_failed |= endpoints
+                .map(|i| check_opt(i, authority_opt.as_ref()))
+                .transpose()?;
+            endpoints
                 .oauth_authorization_endpoint
-                .map(|u| u.authority_components() != authority_opt)
-                .unwrap_or(false);
-            any_failed |= endpoints
+                .map(|i| check_opt(i, authority_opt.as_ref()))
+                .transpose()?;
+            endpoints
                 .oauth_token_endpoint
-                .map(|u| u.authority_components() != authority_opt)
-                .unwrap_or(false);
-            any_failed |= endpoints
+                .map(|i| check_opt(i, authority_opt.as_ref()))
+                .transpose()?;
+            endpoints
                 .provide_client_key
-                .map(|u| u.authority_components() != authority_opt)
-                .unwrap_or(false);
-            any_failed |= endpoints
+                .map(|i| check_opt(i, authority_opt.as_ref()))
+                .transpose()?;
+            endpoints
                 .sign_client_key
-                .map(|u| u.authority_components() != authority_opt)
-                .unwrap_or(false);
-            any_failed |= endpoints
+                .map(|i| check_opt(i, authority_opt.as_ref()))
+                .transpose()?;
+            endpoints
                 .shared_inbox
-                .map(|u| u.authority_components() != authority_opt)
-                .unwrap_or(false);
-
-            if any_failed {
-                return Err(CheckError);
-            }
+                .map(|i| check_opt(i, authority_opt.as_ref()))
+                .transpose()?;
 
             return Ok(Some(endpoints));
         }
diff --git a/src/base.rs b/src/base.rs
index 1e1008f..5d97514 100644
--- a/src/base.rs
+++ b/src/base.rs
@@ -263,7 +263,7 @@ pub trait BaseExt: AsBase {
         let authority = self
             .id_unchecked()
             .and_then(|id| id.authority_components())
-            .ok_or(CheckError)?;
+            .ok_or(CheckError(Some(iri.as_ref().to_owned())))?;
         check(iri, authority.host(), authority.port())
     }
 
@@ -290,7 +290,7 @@ pub trait BaseExt: AsBase {
                 if authority.host() == host && authority.port() == port {
                     Some(Ok(id))
                 } else {
-                    Some(Err(CheckError))
+                    Some(Err(CheckError(Some(id.clone()))))
                 }
             })
             .transpose()
@@ -342,7 +342,7 @@ pub trait BaseExt: AsBase {
                 if authority.host() == host && authority.port() == port {
                     Some(Ok(id))
                 } else {
-                    Some(Err(CheckError))
+                    Some(Err(CheckError(Some(id.clone()))))
                 }
             })
             .transpose()
diff --git a/src/checked.rs b/src/checked.rs
index 8ec21ee..4cf4a99 100644
--- a/src/checked.rs
+++ b/src/checked.rs
@@ -1,11 +1,15 @@
-use iri_string::types::IriStr;
+use iri_string::types::{IriStr, IriString};
 
 #[derive(Clone, Debug)]
-pub struct CheckError;
+pub struct CheckError(pub(crate) Option<IriString>);
 
 impl std::fmt::Display for CheckError {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        write!(f, "IRI failed host and port check")
+        if let Some(iri) = &self.0 {
+            write!(f, "IRI failed host and port check: {}", iri)
+        } else {
+            write!(f, "IRI missing")
+        }
     }
 }
 
@@ -16,10 +20,13 @@ pub(crate) fn check<T: AsRef<IriStr>>(
     host: &str,
     port: Option<&str>,
 ) -> Result<T, CheckError> {
-    let authority = iri.as_ref().authority_components().ok_or(CheckError)?;
+    let authority = iri
+        .as_ref()
+        .authority_components()
+        .ok_or(CheckError(Some(iri.as_ref().to_owned())))?;
 
     if authority.host() != host || authority.port() != port {
-        return Err(CheckError);
+        return Err(CheckError(Some(iri.as_ref().to_owned())));
     }
 
     Ok(iri)