diff --git a/doc/help/commands.asciidoc b/doc/help/commands.asciidoc
index 1d7ac608d..b469104e6 100644
--- a/doc/help/commands.asciidoc
+++ b/doc/help/commands.asciidoc
@@ -743,7 +743,9 @@ This tries to automatically click on typical _Previous Page_ or _Next Page_ link
  - `next`: Open a _next_ link.
  - `up`: Go up a level in the current URL.
  - `increment`: Increment the last number in the URL.
+ Uses the link:settings.html#url.incdec_segments[url.incdec_segments] config option.
  - `decrement`: Decrement the last number in the URL.
+ Uses the link:settings.html#url.incdec_segments[url.incdec_segments] config option.
  
 
 
diff --git a/doc/help/settings.asciidoc b/doc/help/settings.asciidoc
index 73aae6fb2..67ede4fa8 100644
--- a/doc/help/settings.asciidoc
+++ b/doc/help/settings.asciidoc
@@ -2994,6 +2994,7 @@ Type: <<types,FlagList>>
 Valid values:
 
  * +host+
+ * +port+
  * +path+
  * +query+
  * +anchor+
diff --git a/qutebrowser/browser/commands.py b/qutebrowser/browser/commands.py
index 6ddb72636..6eaa3e167 100644
--- a/qutebrowser/browser/commands.py
+++ b/qutebrowser/browser/commands.py
@@ -638,7 +638,9 @@ class CommandDispatcher:
                 - `next`: Open a _next_ link.
                 - `up`: Go up a level in the current URL.
                 - `increment`: Increment the last number in the URL.
+                  Uses the link:settings.html#url.incdec_segments[url.incdec_segments] config option.
                 - `decrement`: Decrement the last number in the URL.
+                  Uses the link:settings.html#url.incdec_segments[url.incdec_segments] config option.
 
             tab: Open in a new tab.
             bg: Open in a background tab.
diff --git a/qutebrowser/config/configdata.yml b/qutebrowser/config/configdata.yml
index a118a8b59..2d99af729 100644
--- a/qutebrowser/config/configdata.yml
+++ b/qutebrowser/config/configdata.yml
@@ -1418,7 +1418,7 @@ url.default_page:
 url.incdec_segments:
   type:
     name: FlagList
-    valid_values: [host, path, query, anchor]
+    valid_values: [host, port, path, query, anchor]
   default: [path, query]
   desc: URL segments where `:navigate increment/decrement` will search for
     a number.
diff --git a/qutebrowser/utils/urlutils.py b/qutebrowser/utils/urlutils.py
index 97e03c072..88853483e 100644
--- a/qutebrowser/utils/urlutils.py
+++ b/qutebrowser/utils/urlutils.py
@@ -537,7 +537,7 @@ def incdec_number(url, incdec, count=1, segments=None):
         incdec: Either 'increment' or 'decrement'
         count: The number to increment or decrement by
         segments: A set of URL segments to search. Valid segments are:
-                  'host', 'path', 'query', 'anchor'.
+                  'host', 'port', 'path', 'query', 'anchor'.
                   Default: {'path', 'query'}
 
     Return:
@@ -550,7 +550,7 @@ def incdec_number(url, incdec, count=1, segments=None):
 
     if segments is None:
         segments = {'path', 'query'}
-    valid_segments = {'host', 'path', 'query', 'anchor'}
+    valid_segments = {'host', 'port', 'path', 'query', 'anchor'}
     if segments - valid_segments:
         extra_elements = segments - valid_segments
         raise IncDecError("Invalid segments: {}".format(
@@ -561,6 +561,7 @@ def incdec_number(url, incdec, count=1, segments=None):
     # Order as they appear in a URL
     segment_modifiers = [
         ('host', url.host, url.setHost),
+        ('port', lambda: str(url.port()) if url.port() > 0 else '', lambda x: url.setPort(int(x))),
         ('path', url.path, url.setPath),
         ('query', url.query, url.setQuery),
         ('anchor', url.fragment, url.setFragment),
diff --git a/tests/unit/utils/test_urlutils.py b/tests/unit/utils/test_urlutils.py
index 4d9b3ba0a..de83ba7bf 100644
--- a/tests/unit/utils/test_urlutils.py
+++ b/tests/unit/utils/test_urlutils.py
@@ -622,6 +622,23 @@ class TestIncDecNumber:
             base_url, incdec, segments={'host', 'path', 'query', 'anchor'})
         assert new_url == expected_url
 
+    def test_incdec_port(self):
+        """Test incdec_number with port."""
+
+        base_url = QUrl('http://localhost:8000')
+        new_url = urlutils.incdec_number(
+            base_url, 'increment', segments={'port'})
+        assert new_url == QUrl('http://localhost:8001')
+        new_url = urlutils.incdec_number(
+            base_url, 'decrement', segments={'port'})
+        assert new_url == QUrl('http://localhost:7999')
+
+    def test_incdec_port_default(self):
+        """Test that a default port (with url.port() == -1) is not touched."""
+        base_url = QUrl('http://localhost')
+        with pytest.raises(urlutils.IncDecError):
+            urlutils.incdec_number(base_url, 'increment', segments={'port'})
+
     @pytest.mark.parametrize('incdec', ['increment', 'decrement'])
     @pytest.mark.parametrize('value', [
         '{}foo', 'foo{}', 'foo{}bar', '42foo{}'