diff --git a/src/validators/hostname.py b/src/validators/hostname.py
index 96fca00..ad415e1 100644
--- a/src/validators/hostname.py
+++ b/src/validators/hostname.py
@@ -34,13 +34,13 @@ def _port_validator(value: str):
     if value.count("]:") == 1:
         # with ipv6
         host_seg, port_seg = value.rsplit(":", 1)
-        if _port_regex().match(f":{port_seg}"):
+        if _port_regex().fullmatch(f":{port_seg}"):
             return host_seg.lstrip("[").rstrip("]")
 
     if value.count(":") == 1:
         # with ipv4 or simple hostname
         host_seg, port_seg = value.rsplit(":", 1)
-        if _port_regex().match(f":{port_seg}"):
+        if _port_regex().fullmatch(f":{port_seg}"):
             return host_seg
 
     return None
@@ -120,7 +120,7 @@ def _matches_simple_hostname(host: str):
         # hostname, not only on the dotted names handled by `domain()`.
         if rfc_1034 and host.endswith("."):
             host = host[:-1]
-        return _simple_hostname_regex().match(host)
+        return _simple_hostname_regex().fullmatch(host)
 
     if may_have_port and (host_seg := _port_validator(value)):
         return (
diff --git a/tests/test_hostname.py b/tests/test_hostname.py
index 1fe2468..df54b02 100644
--- a/tests/test_hostname.py
+++ b/tests/test_hostname.py
@@ -109,3 +109,19 @@ def test_returns_true_on_hostname_within_rfc_length_limits(value: str):
 def test_returns_failed_validation_on_hostname_beyond_rfc_limits(value: str):
     """Test returns failed validation on hostname beyond RFC limits."""
     assert isinstance(hostname(value), ValidationError)
+
+
+@pytest.mark.parametrize(
+    "value",
+    [
+        "ubuntu-pc\n",
+        "ubuntu-pc:443\n",
+        "example.com:443\n",
+        "127.0.0.1:22\n",
+        "[::1]:22\n",
+        "[dead:beef:0:0:0:0000:42:1]:5731\n",
+    ],
+)
+def test_rejects_trailing_newline_in_hostnames_and_ports(value: str):
+    """Test rejects trailing newline in hostnames and ports."""
+    assert isinstance(hostname(value), ValidationError)