diff --git a/libraries/viewport/viewport.js b/libraries/viewport/viewport.js
new file mode 100644
index 00000000000..b385e9a27ec
--- /dev/null
+++ b/libraries/viewport/viewport.js
@@ -0,0 +1,13 @@
+import {getWindowTop} from '../../src/utils.js';
+
+export function getViewportCoordinates() {
+  try {
+    const win = getWindowTop();
+    let { scrollY: top, scrollX: left, innerHeight, innerWidth } = win;
+    innerHeight = innerHeight || win.document.documentElement.clientWidth || win.document.body.clientWidth;
+    innerWidth = innerWidth || win.document.documentElement.clientHeight || win.document.body.clientHeight
+    return { top, right: left + innerWidth, bottom: top + innerHeight, left };
+  } catch (e) {
+    return {};
+  }
+}
diff --git a/modules/medianetBidAdapter.js b/modules/medianetBidAdapter.js
index c90292a74ac..0c43b04f53c 100644
--- a/modules/medianetBidAdapter.js
+++ b/modules/medianetBidAdapter.js
@@ -21,6 +21,7 @@ import { convertOrtbRequestToProprietaryNative } from '../src/native.js';
 import {getGlobal} from '../src/prebidGlobal.js';
 import {getGptSlotInfoForAdUnitCode} from '../libraries/gptUtils/gptUtils.js';
 import {ajax} from '../src/ajax.js';
+import {getViewportCoordinates} from '../libraries/viewport/viewport.js';
 
 /**
  * @typedef {import('../src/adapters/bidderFactory.js').BidRequest} BidRequest
@@ -180,6 +181,7 @@ function extParams(bidRequest, bidderRequests) {
   const gdprApplies = !!(gdpr && gdpr.gdprApplies);
   const uspApplies = !!(uspConsent);
   const coppaApplies = !!(config.getConfig('coppa'));
+  const {top = -1, right = -1, bottom = -1, left = -1} = getViewportCoordinates();
   return Object.assign({},
     { customer_id: params.cid },
     { prebid_version: 'v' + '$prebid.version$' },
@@ -191,7 +193,13 @@ function extParams(bidRequest, bidderRequests) {
     windowSize.w !== -1 && windowSize.h !== -1 && { screen: windowSize },
     userId && { user_id: userId },
     getGlobal().medianetGlobals.analyticsEnabled && { analytics: true },
-    !isEmpty(sChain) && {schain: sChain}
+    !isEmpty(sChain) && {schain: sChain},
+    {
+      vcoords: {
+        top_left: { x: left, y: top },
+        bottom_right: { x: right, y: bottom }
+      }
+    }
   );
 }
 
@@ -317,14 +325,15 @@ function getOverlapArea(topLeft1, bottomRight1, topLeft2, bottomRight2) {
 }
 
 function normalizeCoordinates(coordinates) {
+  const {scrollX, scrollY} = window;
   return {
     top_left: {
-      x: coordinates.top_left.x + window.pageXOffset,
-      y: coordinates.top_left.y + window.pageYOffset,
+      x: coordinates.top_left.x + scrollX,
+      y: coordinates.top_left.y + scrollY,
     },
     bottom_right: {
-      x: coordinates.bottom_right.x + window.pageXOffset,
-      y: coordinates.bottom_right.y + window.pageYOffset,
+      x: coordinates.bottom_right.x + scrollX,
+      y: coordinates.bottom_right.y + scrollY,
     }
   }
 }
diff --git a/test/spec/modules/medianetBidAdapter_spec.js b/test/spec/modules/medianetBidAdapter_spec.js
index d3eab769f4a..5f2efc7864f 100644
--- a/test/spec/modules/medianetBidAdapter_spec.js
+++ b/test/spec/modules/medianetBidAdapter_spec.js
@@ -531,6 +531,16 @@ let VALID_BID_REQUEST = [{
       'screen': {
         'w': 1000,
         'h': 1000
+      },
+      'vcoords': {
+        'top_left': {
+          'x': 50,
+          'y': 100
+        },
+        'bottom_right': {
+          'x': 490,
+          'y': 880
+        }
       }
     },
     'id': 'aafabfd0-28c0-4ac0-aa09-99689e88b81d',
@@ -622,6 +632,16 @@ let VALID_BID_REQUEST = [{
       'screen': {
         'w': 1000,
         'h': 1000
+      },
+      'vcoords': {
+        'top_left': {
+          'x': 50,
+          'y': 100
+        },
+        'bottom_right': {
+          'x': 490,
+          'y': 880
+        }
       }
     },
     'id': 'aafabfd0-28c0-4ac0-aa09-99689e88b81d',
@@ -714,6 +734,16 @@ let VALID_BID_REQUEST = [{
       'screen': {
         'w': 1000,
         'h': 1000
+      },
+      'vcoords': {
+        'top_left': {
+          'x': 50,
+          'y': 100
+        },
+        'bottom_right': {
+          'x': 490,
+          'y': 880
+        }
       }
     },
     'id': 'aafabfd0-28c0-4ac0-aa09-99689e88b81d',
@@ -807,6 +837,16 @@ let VALID_BID_REQUEST = [{
       'screen': {
         'w': 1000,
         'h': 1000
+      },
+      'vcoords': {
+        'top_left': {
+          'x': 50,
+          'y': 100
+        },
+        'bottom_right': {
+          'x': 490,
+          'y': 880
+        }
       }
     },
     'id': 'aafabfd0-28c0-4ac0-aa09-99689e88b81d',
@@ -901,6 +941,16 @@ let VALID_BID_REQUEST = [{
       'screen': {
         'w': 1000,
         'h': 1000
+      },
+      'vcoords': {
+        'top_left': {
+          'x': 50,
+          'y': 100
+        },
+        'bottom_right': {
+          'x': 490,
+          'y': 880
+        }
       }
     },
     'id': 'aafabfd0-28c0-4ac0-aa09-99689e88b81d',
@@ -1008,6 +1058,16 @@ let VALID_BID_REQUEST = [{
       'screen': {
         'w': 1000,
         'h': 1000
+      },
+      'vcoords': {
+        'top_left': {
+          'x': 50,
+          'y': 100
+        },
+        'bottom_right': {
+          'x': 490,
+          'y': 880
+        }
       }
     },
     'id': 'aafabfd0-28c0-4ac0-aa09-99689e88b81d',
@@ -1104,6 +1164,16 @@ let VALID_BID_REQUEST = [{
         'w': 1000,
         'h': 1000
       },
+      'vcoords': {
+        'top_left': {
+          'x': 50,
+          'y': 100
+        },
+        'bottom_right': {
+          'x': 490,
+          'y': 880
+        }
+      }
     },
     'id': 'aafabfd0-28c0-4ac0-aa09-99689e88b81d',
     'imp': [
@@ -1640,6 +1710,16 @@ let VALID_BID_REQUEST = [{
       'screen': {
         'w': 1000,
         'h': 1000
+      },
+      'vcoords': {
+        'top_left': {
+          'x': 50,
+          'y': 100
+        },
+        'bottom_right': {
+          'x': 490,
+          'y': 880
+        }
       }
     },
     'id': 'aafabfd0-28c0-4ac0-aa09-99689e88b81d',
@@ -1747,6 +1827,16 @@ let VALID_BID_REQUEST = [{
       'screen': {
         'w': 1000,
         'h': 1000
+      },
+      'vcoords': {
+        'top_left': {
+          'x': 50,
+          'y': 100
+        },
+        'bottom_right': {
+          'x': 490,
+          'y': 880
+        }
       }
     },
     'id': 'aafabfd0-28c0-4ac0-aa09-99689e88b81d',
@@ -1829,6 +1919,10 @@ describe('Media.net bid adapter', function () {
   let sandbox;
   beforeEach(function () {
     sandbox = sinon.sandbox.create();
+    sandbox.stub(window.top, 'innerHeight').value(780)
+    sandbox.stub(window.top, 'innerWidth').value(440)
+    sandbox.stub(window.top, 'scrollY').value(100)
+    sandbox.stub(window.top, 'scrollX').value(50)
   });
 
   afterEach(function () {