diff --git a/modules/appnexusBidAdapter.js b/modules/appnexusBidAdapter.js
index 7dac4b8b182..01f45d30413 100644
--- a/modules/appnexusBidAdapter.js
+++ b/modules/appnexusBidAdapter.js
@@ -11,6 +11,8 @@ const VIDEO_TARGETING = ['id', 'mimes', 'minduration', 'maxduration',
   'startdelay', 'skippable', 'playback_method', 'frameworks'];
 const USER_PARAMS = ['age', 'external_uid', 'segments', 'gender', 'dnt', 'language'];
 const APP_DEVICE_PARAMS = ['geo', 'device_id']; // appid is collected separately
+const AST_DEBUG_URL = ['ast_debug', 'ast_dongle', 'ast_debug_member', 'ast_debug_timeout']
+const AST_DEBUG_PARAMS = ['enabled', 'dongle', 'member_id', 'debug_timeout']
 const NATIVE_MAPPING = {
   body: 'description',
   cta: 'ctatext',
@@ -77,6 +79,38 @@ export const spec = {
       };
     }
 
+    let debugObj = {};
+    const debugObjParams = find(bidRequests, hasDebug);
+    if (debugObjParams && debugObjParams.debug) {
+      Object.keys(debugObjParams.debug)
+        .filter(param => includes(AST_DEBUG_PARAMS, param))
+        .forEach(param => {
+          debugObj['debug'] = debugObj['debug'] || {};
+          debugObj.debug[param] = debugObjParams.debug[param]
+        });
+    }
+
+    const debugUrlParams = getURLparams();
+    if (debugUrlParams && debugUrlParams.params) {
+      Object.keys(debugUrlParams.params)
+        .filter(param => includes(AST_DEBUG_URL, param))
+        .forEach(param => {
+          debugObj['debug'] = debugObj['debug'] || {};
+          if (param == 'ast_debug') {
+            debugObj['debug']['enabled'] = (debugUrlParams.params[param] === 'true');
+          }
+          if (param == 'ast_dongle') {
+            debugObj['debug']['dongle'] = debugUrlParams.params[param];
+          }
+          if (param == 'ast_debug_member') {
+            debugObj['debug']['member_id'] = parseInt(debugUrlParams.params[param], 10);
+          }
+          if (param == 'ast_debug_timeout') {
+            debugObj['debug']['debug_timeout'] = parseInt(debugUrlParams.params[param], 10);
+          }
+        });
+    }
+
     const memberIdBid = find(bidRequests, hasMemberId);
     const member = memberIdBid ? parseInt(memberIdBid.params.member, 10) : 0;
 
@@ -99,6 +133,10 @@ export const spec = {
       payload.app = appIdObj;
     }
 
+    if (debugObj && debugObj.debug) {
+      payload.debug = debugObj.debug
+    }
+
     if (bidderRequest && bidderRequest.gdprConsent) {
       // note - objects for impbus use underscore instead of camelCase
       payload.gdpr_consent = {
@@ -144,6 +182,21 @@ export const spec = {
         }
       });
     }
+
+    if (serverResponse.debug && serverResponse.debug.debug_info) {
+      let debugHeader = 'AppNexus Debug Auction for Prebid\n\n'
+      let debugText = debugHeader + serverResponse.debug.debug_info
+      debugText = debugText
+        .replace(/(<td>|<th>)/gm, '\t') // Tables
+        .replace(/(<\/td>|<\/th>)/gm, '\n') // Tables
+        .replace(/^<br>/gm, '') // Remove leading <br>
+        .replace(/(<br>\n|<br>)/gm, '\n') // <br>
+        .replace(/<h1>(.*)<\/h1>/gm, '\n\n===== $1 =====\n\n') // Header H1
+        .replace(/<h[2-6]>(.*)<\/h[2-6]>/gm, '\n\n*** $1 ***\n\n') // Headers
+        .replace(/(<([^>]+)>)/igm, ''); // Remove any other tags
+      utils.logMessage(debugText);
+    }
+
     return bids;
   },
 
@@ -419,6 +472,23 @@ function hasAppId(bid) {
   return !!bid.params.app
 }
 
+function hasDebug(bid) {
+  return !!bid.debug
+}
+
+function getURLparams() {
+  let obj = {};
+  if (utils.getTopWindowLocation() && utils.getTopWindowLocation().search) {
+    obj['params'] = {};
+    utils.getTopWindowLocation().search.substr(1).split('&').forEach(keyvalue => {
+      let key = keyvalue.split('=')[0];
+      let val = keyvalue.split('=')[1];
+      obj['params'][key] = val
+    });
+  }
+  return obj
+}
+
 function getRtbBid(tag) {
   return tag && tag.ads && tag.ads.length && find(tag.ads, ad => ad.rtb);
 }
diff --git a/test/spec/modules/appnexusBidAdapter_spec.js b/test/spec/modules/appnexusBidAdapter_spec.js
index b65988e3ec1..111d5ad91dd 100644
--- a/test/spec/modules/appnexusBidAdapter_spec.js
+++ b/test/spec/modules/appnexusBidAdapter_spec.js
@@ -370,6 +370,32 @@ describe('AppNexusAdapter', () => {
         lng: -75.3009142
       });
     });
+
+    it('sends a debug auction', () => {
+      let debugRequest = Object.assign({},
+        bidRequests[0],
+        {
+          params: {
+            placementId: '10433394'
+          },
+          debug: {
+            enabled: true,
+            dongle: 'QWERTY',
+            member_id: 958,
+            debug_timeout: 1000
+          }
+        }
+      );
+      const request = spec.buildRequests([debugRequest]);
+      const payload = JSON.parse(request.data);
+      expect(payload.debug).to.exist;
+      expect(payload.debug).to.deep.equal({
+        enabled: true,
+        dongle: 'QWERTY',
+        member_id: 958,
+        debug_timeout: 1000
+      });
+    });
   })
 
   describe('interpretResponse', () => {