diff --git a/.github/workflows/healthcheck-app-existingVpc-Ubuntu-Thurs.yml b/.github/workflows/healthcheck-app-existingVpc-Ubuntu-Thurs.yml
index 6bef751..a2cd6ae 100644
--- a/.github/workflows/healthcheck-app-existingVpc-Ubuntu-Thurs.yml
+++ b/.github/workflows/healthcheck-app-existingVpc-Ubuntu-Thurs.yml
@@ -40,4 +40,4 @@ jobs:
     - name: MATLAB Web App Server Reference Architecture Health Check Test Ubuntu Existing VPC Ubuntu us-east-1 region
       run: |
         cd healthcheck
-        python test_mwasrefarch_healthcheck_newvpc.py ${{ secrets.OIDCKeyPairNameVirginia }} ${{ secrets.lmpassword }} ${{ secrets.ipaddress }} "us-east-1" "Ubuntu"
+        python test_mwasrefarch_healthcheck_newvpc.py ${{ secrets.OIDCKeyPairNameVirginia }} ${{ secrets.lmpassword }} "us-east-1" "Ubuntu"
diff --git a/.github/workflows/healthcheck-app-existingVpc-Win-Tue.yml b/.github/workflows/healthcheck-app-existingVpc-Win-Tue.yml
index eb878c5..242b314 100644
--- a/.github/workflows/healthcheck-app-existingVpc-Win-Tue.yml
+++ b/.github/workflows/healthcheck-app-existingVpc-Win-Tue.yml
@@ -40,4 +40,4 @@ jobs:
     - name: MATLAB Web App Server Reference Architecture Health Check Test Windows Existing VPC Windows eu-west-1 region
       run: |
         cd healthcheck
-        python test_webappserver_refarch_existingvpc.py ${{ secrets.OIDCKeyPairNameIreland }} ${{ secrets.lmpassword }} ${{ secrets.ipaddress }} "eu-west-1" "Windows"
+        python test_webappserver_refarch_existingvpc.py ${{ secrets.OIDCKeyPairNameIreland }} ${{ secrets.lmpassword }} "eu-west-1" "Windows"
diff --git a/.github/workflows/healthcheck-app-newVpc-Ubuntu-Mon.yml b/.github/workflows/healthcheck-app-newVpc-Ubuntu-Mon.yml
index a29c096..a4e8237 100644
--- a/.github/workflows/healthcheck-app-newVpc-Ubuntu-Mon.yml
+++ b/.github/workflows/healthcheck-app-newVpc-Ubuntu-Mon.yml
@@ -42,4 +42,4 @@ jobs:
     - name: MATLAB Web App Server Reference Architecture Health Check Test Ubuntu New VPC Ubuntu us-east-1 region
       run: |
         cd healthcheck
-        python test_mwasrefarch_healthcheck_newvpc.py ${{ secrets.OIDCKeyPairNameVirginia }} ${{ secrets.lmpassword }} ${{ secrets.ipaddress }} "us-east-1" "Ubuntu"
+        python test_mwasrefarch_healthcheck_newvpc.py ${{ secrets.OIDCKeyPairNameVirginia }} ${{ secrets.lmpassword }} "us-east-1" "Ubuntu"
diff --git a/.github/workflows/healthcheck-app-newVpc-Win-Wed.yml b/.github/workflows/healthcheck-app-newVpc-Win-Wed.yml
index c83a679..ca6bb72 100644
--- a/.github/workflows/healthcheck-app-newVpc-Win-Wed.yml
+++ b/.github/workflows/healthcheck-app-newVpc-Win-Wed.yml
@@ -40,4 +40,4 @@ jobs:
     - name: MATLAB Web App Server Reference Architecture Health Check Test Windows New VPC Windows ap-northeast region
       run: |
         cd healthcheck
-        python test_mwasrefarch_healthcheck_newvpc.py ${{ secrets.OIDCKeyPairNameTokyo }} ${{ secrets.lmpassword }} ${{ secrets.ipaddress }} "ap-northeast-1" "Windows"
+        python test_mwasrefarch_healthcheck_newvpc.py ${{ secrets.OIDCKeyPairNameTokyo }} ${{ secrets.lmpassword }} "ap-northeast-1" "Windows"
diff --git a/healthcheck/test_mwasrefarch_healthcheck_newvpc.py b/healthcheck/test_mwasrefarch_healthcheck_newvpc.py
index 32a75d0..8164f8c 100644
--- a/healthcheck/test_mwasrefarch_healthcheck_newvpc.py
+++ b/healthcheck/test_mwasrefarch_healthcheck_newvpc.py
@@ -10,9 +10,10 @@
 from datetime import date
 import json
 
-def main(keypairname, password, ipAddress, location_arg, platform_arg):
+def main(keypairname, password, location_arg, platform_arg):
     # Reference architectures in production.
     ref_arch_name = 'matlab-web-app-server-on-aws'
+    ipAddress = requests.get("https://api.ipify.org").text + "/32"
     parameters = [{'ParameterKey': 'KeyPairName', 'ParameterValue': keypairname},
                   {'ParameterKey': 'AdminIPAddress', 'ParameterValue': ipAddress},
                   {'ParameterKey': 'Password', 'ParameterValue': password},
@@ -62,4 +63,4 @@ def main(keypairname, password, ipAddress, location_arg, platform_arg):
                 print("\n\n")
 
 if __name__ == '__main__':
-    main(sys.argv[1], sys.argv[2], sys.argv[3], sys.argv[4], sys.argv[5])
+    main(sys.argv[1], sys.argv[2], sys.argv[3], sys.argv[4])
diff --git a/healthcheck/test_webappserver_refarch_existingvpc.py b/healthcheck/test_webappserver_refarch_existingvpc.py
index 67cccde..cc31012 100644
--- a/healthcheck/test_webappserver_refarch_existingvpc.py
+++ b/healthcheck/test_webappserver_refarch_existingvpc.py
@@ -14,10 +14,11 @@
 from datetime import date
 import sys
 
-def main(keypairname, password, ipAddress, location_arg, platform_arg):
+def main(keypairname, password, location_arg, platform_arg):
    # Reference architectures in production.
    # Deploy a stack for creating VPC with 2 subnets
     existing_template_url = "https://matlab-web-app-server-templates.s3.amazonaws.com/r2022a_refarch/VPCStack.yml"
+    ipAddress = requests.get("https://api.ipify.org").text + "/32"
     vpc_parameters  = [{"ParameterKey": "AllowPublicIP",
                             "ParameterValue": "Yes"}]
     existingstack = deploy.deploy_stack(existing_template_url, vpc_parameters, location_arg, "existingvpc")
@@ -88,4 +89,4 @@ def main(keypairname, password, ipAddress, location_arg, platform_arg):
 
 
 if __name__ == '__main__':
-    main(sys.argv[1], sys.argv[2], sys.argv[3], sys.argv[4], sys.argv[5])
+    main(sys.argv[1], sys.argv[2], sys.argv[3], sys.argv[4])