diff --git a/NetboxPS.psproj b/NetboxPS.psproj
index 1b008af..e938937 100644
--- a/NetboxPS.psproj
+++ b/NetboxPS.psproj
@@ -39,7 +39,7 @@
     <File Build="0" Shared="True" ReferenceFunction="Invoke-DCIM_Support_ps1" ExportFunctions="False">Functions\DCIM\DCIM.Support.ps1</File>
     <File Build="0" Shared="True" ReferenceFunction="Invoke-IPAM_Support_ps1" ExportFunctions="False">Functions\IPAM\IPAM.Support.ps1</File>
     <File Build="0" Shared="True" ReferenceFunction="Invoke-Virtualization_Support_ps1" ExportFunctions="False">Functions\Virtualization\Virtualization.Support.ps1</File>
-    <File Build="2" Shared="True" ReferenceFunction="Invoke-Setup_Support_ps1" ExportFunctions="False">Functions\Setup.Support.ps1</File>
+    <File Build="0" Shared="True" ReferenceFunction="Invoke-Setup_Support_ps1" ExportFunctions="False">Functions\Setup.Support.ps1</File>
   </Files>
   <StartupScript>R:\Netbox\NetboxPS\Test-Module.ps1</StartupScript>
 </Project>
\ No newline at end of file
diff --git a/Tests/IPAM.Tests.ps1 b/Tests/IPAM.Tests.ps1
index e637f75..73fa4f4 100644
--- a/Tests/IPAM.Tests.ps1
+++ b/Tests/IPAM.Tests.ps1
@@ -348,6 +348,41 @@ Describe -Name "IPAM tests" -Tag 'Ipam' -Fixture {
             }
         }
         
+        Context -Name "New-NetboxIPAMPrefix" -Fixture {
+            It "Should create a basic prefix" {
+                $Result = New-NetboxIPAMPrefix -Prefix "10.0.0.0/24"
+                
+                Assert-VerifiableMock
+                
+                $Result.Method | Should -Be 'POST'
+                $Result.URI | Should -Be 'https://netbox.domain.com/api/ipam/prefixes/'
+                $Result.Headers.Keys.Count | Should -BeExactly 1
+                $Result.Body | Should -Be '{"prefix":"10.0.0.0/24","status":1}'
+            }
+            
+            It "Should create a prefix with a status and role names" {
+                $Result = New-NetboxIPAMPrefix -Prefix "10.0.0.0/24" -Status 'Active' -Role 'Active'
+                
+                Assert-VerifiableMock
+                
+                $Result.Method | Should -Be 'POST'
+                $Result.URI | Should -Be 'https://netbox.domain.com/api/ipam/prefixes/'
+                $Result.Headers.Keys.Count | Should -BeExactly 1
+                $Result.Body | Should -Be '{"prefix":"10.0.0.0/24","status":1,"role":"Active"}'
+            }
+            
+            It "Should create a prefix with a status, role name, and tenant ID" {
+                $Result = New-NetboxIPAMPrefix -Prefix "10.0.0.0/24" -Status 'Active' -Role 'Active' -Tenant 15
+                
+                Assert-VerifiableMock
+                
+                $Result.Method | Should -Be 'POST'
+                $Result.URI | Should -Be 'https://netbox.domain.com/api/ipam/prefixes/'
+                $Result.Headers.Keys.Count | Should -BeExactly 1
+                $Result.Body | Should -Be '{"prefix":"10.0.0.0/24","status":1,"tenant":15,"role":"Active"}'
+            }
+        }
+        
         Context -Name "New-NetboxIPAMAddress" -Fixture {
             It "Should create a basic IP address" {
                 $Result = New-NetboxIPAMAddress -Address '10.0.0.1/24'
diff --git a/dist/Tests/Helpers.Tests.ps1 b/dist/Tests/Helpers.Tests.ps1
index 63587eb..26ea592 100644
--- a/dist/Tests/Helpers.Tests.ps1
+++ b/dist/Tests/Helpers.Tests.ps1
@@ -146,6 +146,24 @@ Describe "Helpers tests" -Tag 'Core', 'Helpers' -Fixture {
                 $URIComponents.Parameters | Should -BeOfType [hashtable]
                 $URIComponents.Parameters['q'] | Should -Be 'mytestquery'
             }
+            
+            It "Should generate custom field parameters" {
+                $URIComponents = BuildURIComponents -URISegments @('segment1', 'segment2') -ParametersDictionary @{
+                    'CustomFields' = @{
+                        'PRTG_Id' = 1234
+                        'Customer_Id' = 'abc'
+                    }
+                }
+                
+                $URIComponents | Should -BeOfType [hashtable]
+                $URIComponents.Keys.Count | Should -BeExactly 2
+                $URIComponents.Keys | Should -Be @("Segments", "Parameters")
+                $URIComponents.Segments | Should -Be @("segment1", "segment2")
+                $URIComponents.Parameters.Count | Should -BeExactly 2
+                $URIComponents.Parameters | Should -BeOfType [hashtable]
+                $URIComponents.Parameters['cf_prtg_id'] | Should -Be '1234'
+                $URIComponents.Parameters['cf_customer_id'] | Should -Be 'abc'
+            }
         }
         
         Context -Name "Invoking request tests" -Fixture {
diff --git a/dist/Tests/IPAM.Tests.ps1 b/dist/Tests/IPAM.Tests.ps1
index e637f75..73fa4f4 100644
--- a/dist/Tests/IPAM.Tests.ps1
+++ b/dist/Tests/IPAM.Tests.ps1
@@ -348,6 +348,41 @@ Describe -Name "IPAM tests" -Tag 'Ipam' -Fixture {
             }
         }
         
+        Context -Name "New-NetboxIPAMPrefix" -Fixture {
+            It "Should create a basic prefix" {
+                $Result = New-NetboxIPAMPrefix -Prefix "10.0.0.0/24"
+                
+                Assert-VerifiableMock
+                
+                $Result.Method | Should -Be 'POST'
+                $Result.URI | Should -Be 'https://netbox.domain.com/api/ipam/prefixes/'
+                $Result.Headers.Keys.Count | Should -BeExactly 1
+                $Result.Body | Should -Be '{"prefix":"10.0.0.0/24","status":1}'
+            }
+            
+            It "Should create a prefix with a status and role names" {
+                $Result = New-NetboxIPAMPrefix -Prefix "10.0.0.0/24" -Status 'Active' -Role 'Active'
+                
+                Assert-VerifiableMock
+                
+                $Result.Method | Should -Be 'POST'
+                $Result.URI | Should -Be 'https://netbox.domain.com/api/ipam/prefixes/'
+                $Result.Headers.Keys.Count | Should -BeExactly 1
+                $Result.Body | Should -Be '{"prefix":"10.0.0.0/24","status":1,"role":"Active"}'
+            }
+            
+            It "Should create a prefix with a status, role name, and tenant ID" {
+                $Result = New-NetboxIPAMPrefix -Prefix "10.0.0.0/24" -Status 'Active' -Role 'Active' -Tenant 15
+                
+                Assert-VerifiableMock
+                
+                $Result.Method | Should -Be 'POST'
+                $Result.URI | Should -Be 'https://netbox.domain.com/api/ipam/prefixes/'
+                $Result.Headers.Keys.Count | Should -BeExactly 1
+                $Result.Body | Should -Be '{"prefix":"10.0.0.0/24","status":1,"tenant":15,"role":"Active"}'
+            }
+        }
+        
         Context -Name "New-NetboxIPAMAddress" -Fixture {
             It "Should create a basic IP address" {
                 $Result = New-NetboxIPAMAddress -Address '10.0.0.1/24'