diff --git a/CHANGELOG.md b/CHANGELOG.md
index 93aa2c3..2dfd07f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 1.6.0
+
+* A new `residential` object has been added to the `anonymizer` object on
+  `MaxMind::GeoIP2::Model::Insights`. This object contains residential
+  proxy data for the network, including a confidence score, the provider
+  name, and the date the network was last seen. This is only available
+  from the GeoIP2 Insights web service.
+
 ## 1.5.1 (2026-01-19)
 
 * Re-release with a fix to the release process. This includes a bump of the
diff --git a/CLAUDE.md b/CLAUDE.md
index 954fc14..3b2921f 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -115,6 +115,7 @@ def network_last_seen
   date_string = get('network_last_seen')
 
   if !date_string
+    @network_last_seen = nil
     return nil
   end
 
@@ -125,6 +126,7 @@ end
 - Use `defined?(@variable)` to check if already parsed
 - Parse only once and cache in instance variable
 - Handle nil cases before parsing
+- Memoize nil results too, so repeated calls do not re-run the lookup
 
 #### 5. **Web Service Only vs Database Models**
 
@@ -233,6 +235,7 @@ For database models (like AnonymousPlus):
      date_string = get('network_last_seen')
 
      if !date_string
+       @network_last_seen = nil
        return nil
      end
 
diff --git a/lib/maxmind/geoip2/model/anonymous_plus.rb b/lib/maxmind/geoip2/model/anonymous_plus.rb
index 109c9a5..9377514 100644
--- a/lib/maxmind/geoip2/model/anonymous_plus.rb
+++ b/lib/maxmind/geoip2/model/anonymous_plus.rb
@@ -27,6 +27,7 @@ def network_last_seen
           date_string = get('network_last_seen')
 
           if !date_string
+            @network_last_seen = nil
             return nil
           end
 
diff --git a/lib/maxmind/geoip2/record/anonymizer.rb b/lib/maxmind/geoip2/record/anonymizer.rb
index 073b992..337b4b4 100644
--- a/lib/maxmind/geoip2/record/anonymizer.rb
+++ b/lib/maxmind/geoip2/record/anonymizer.rb
@@ -2,6 +2,7 @@
 
 require 'date'
 require 'maxmind/geoip2/record/abstract'
+require 'maxmind/geoip2/record/anonymizer_feed'
 
 module MaxMind
   module GeoIP2
@@ -11,6 +12,20 @@ module Record
       #
       # This record is returned by the Insights web service.
       class Anonymizer < Abstract
+        # Residential proxy data for the network. This may be populated even
+        # when no other anonymizer attributes are set. This property is only
+        # available from Insights.
+        #
+        # @return [MaxMind::GeoIP2::Record::AnonymizerFeed]
+        attr_reader :residential
+
+        # @!visibility private
+        def initialize(record)
+          super
+
+          @residential = AnonymizerFeed.new(record.nil? ? nil : record['residential'])
+        end
+
         # A score ranging from 1 to 99 that represents our percent confidence
         # that the network is currently part of an actively used VPN service.
         # This property is only available from Insights.
@@ -85,6 +100,7 @@ def network_last_seen
           date_string = get('network_last_seen')
 
           if !date_string
+            @network_last_seen = nil
             return nil
           end
 
diff --git a/lib/maxmind/geoip2/record/anonymizer_feed.rb b/lib/maxmind/geoip2/record/anonymizer_feed.rb
new file mode 100644
index 0000000..9adafe4
--- /dev/null
+++ b/lib/maxmind/geoip2/record/anonymizer_feed.rb
@@ -0,0 +1,53 @@
+# frozen_string_literal: true
+
+require 'date'
+require 'maxmind/geoip2/record/abstract'
+
+module MaxMind
+  module GeoIP2
+    module Record
+      # Contains data for one type of anonymizer detection, currently
+      # residential proxies. Additional feeds may be added in the future.
+      #
+      # This record is returned by the anonymizer object of the Insights web
+      # service.
+      class AnonymizerFeed < Abstract
+        # A score ranging from 1 to 99 that represents our percent confidence
+        # that the network is currently part of this anonymizer feed. This
+        # property is only available from Insights.
+        #
+        # @return [Integer, nil]
+        def confidence
+          get('confidence')
+        end
+
+        # The last day that the network was sighted in our analysis of this
+        # anonymizer feed. This value is parsed lazily. This property is only
+        # available from Insights.
+        #
+        # @return [Date, nil] A Date object representing the last seen date,
+        #   or nil if the date is not available.
+        def network_last_seen
+          return @network_last_seen if defined?(@network_last_seen)
+
+          date_string = get('network_last_seen')
+
+          if !date_string
+            @network_last_seen = nil
+            return nil
+          end
+
+          @network_last_seen = Date.parse(date_string)
+        end
+
+        # The name of the provider associated with the network in this
+        # anonymizer feed. This property is only available from Insights.
+        #
+        # @return [String, nil]
+        def provider_name
+          get('provider_name')
+        end
+      end
+    end
+  end
+end
diff --git a/test/test_client.rb b/test/test_client.rb
index c372011..1505e30 100644
--- a/test/test_client.rb
+++ b/test/test_client.rb
@@ -38,6 +38,11 @@ class ClientTest < Minitest::Test
       'is_tor_exit_node' => false,
       'network_last_seen' => '2025-10-15',
       'provider_name' => 'nordvpn',
+      'residential' => {
+        'confidence' => 82,
+        'network_last_seen' => '2026-05-11',
+        'provider_name' => 'quickshift',
+      },
     },
     'continent' => {
       'code' => 'NA',
@@ -109,6 +114,11 @@ def test_insights
     assert_equal(Date.parse('2025-10-15'), record.anonymizer.network_last_seen)
     assert_equal('nordvpn', record.anonymizer.provider_name)
 
+    # Test anonymizer.residential object
+    assert_equal(82, record.anonymizer.residential.confidence)
+    assert_equal(Date.parse('2026-05-11'), record.anonymizer.residential.network_last_seen)
+    assert_equal('quickshift', record.anonymizer.residential.provider_name)
+
     # Test traits
     assert(record.traits.anycast?)
     assert(record.traits.residential_proxy?)
diff --git a/test/test_record.rb b/test/test_record.rb
new file mode 100644
index 0000000..9a71dcf
--- /dev/null
+++ b/test/test_record.rb
@@ -0,0 +1,79 @@
+# frozen_string_literal: true
+
+require 'date'
+require 'maxmind/geoip2'
+require 'minitest/autorun'
+
+class RecordTest < Minitest::Test
+  # This covers the common case where a web service response has no
+  # "anonymizer" key at all. Insights#initialize always calls
+  # Anonymizer.new(record['anonymizer']), so this exercises
+  # Anonymizer.new(nil) and, in turn, AnonymizerFeed.new(nil).
+  def test_insights_no_anonymizer
+    model = MaxMind::GeoIP2::Model::Insights.new({}, ['en'])
+
+    assert_nil(model.anonymizer.confidence)
+    refute(model.anonymizer.anonymous?)
+    refute(model.anonymizer.anonymous_vpn?)
+    refute(model.anonymizer.hosting_provider?)
+    refute(model.anonymizer.public_proxy?)
+    refute(model.anonymizer.residential_proxy?)
+    refute(model.anonymizer.tor_exit_node?)
+    assert_nil(model.anonymizer.network_last_seen)
+    assert_nil(model.anonymizer.provider_name)
+
+    assert_nil(model.anonymizer.residential.confidence)
+    assert_nil(model.anonymizer.residential.network_last_seen)
+    assert_nil(model.anonymizer.residential.provider_name)
+  end
+
+  # This covers an "anonymizer" object being present without a nested
+  # "residential" key, which is the common case when the network is not
+  # part of the residential proxy feed.
+  def test_insights_anonymizer_without_residential
+    model = MaxMind::GeoIP2::Model::Insights.new(
+      {
+        'anonymizer' => {
+          'confidence' => 85,
+        },
+      },
+      ['en'],
+    )
+
+    assert_equal(85, model.anonymizer.confidence)
+
+    assert_nil(model.anonymizer.residential.confidence)
+    assert_nil(model.anonymizer.residential.network_last_seen)
+    assert_nil(model.anonymizer.residential.provider_name)
+  end
+
+  # network_last_seen is parsed lazily and guards against a missing date
+  # string. This asserts the guard is in place rather than an unconditional
+  # Date.parse(nil), which would raise.
+  def test_anonymizer_feed_network_last_seen_absent
+    feed = MaxMind::GeoIP2::Record::AnonymizerFeed.new(
+      { 'confidence' => 82 },
+    )
+
+    assert_nil(feed.network_last_seen)
+  end
+
+  def test_anonymizer_network_last_seen_absent
+    anonymizer = MaxMind::GeoIP2::Record::Anonymizer.new(
+      { 'confidence' => 85 },
+    )
+
+    assert_nil(anonymizer.network_last_seen)
+  end
+
+  def test_anonymous_plus_network_last_seen_absent
+    model = MaxMind::GeoIP2::Model::AnonymousPlus.new(
+      {
+        'ip_address' => '1.2.3.4',
+        'prefix_length' => 24,
+      },
+    )
+
+    assert_nil(model.network_last_seen)
+  end
+end