Closes #8550: Implement ASN ranges (#11835)

* Move ASN to a separate module

* Move ASNField from dcim to ipam

* Introduce ASNRange model

* Add relationship from ASN to ASNRange

* Add an available-asns API endpoint

* Add RIR assignment for ASNRange

* Add standard tests

* Move child ASNs to a tabbed view

* Remove FK on ASN to ASNRange

* Add tests for provisioning available ASNs

* Add docs for ASNRange

netbox/ipam/forms/model_forms.py

@@ -20,6 +20,7 @@ from virtualization.models import Cluster, ClusterGroup, VirtualMachine, VMInter
 __all__ = (
     'AggregateForm',
     'ASNForm',
+    'ASNRangeForm',
     'FHRPGroupForm',
     'FHRPGroupAssignmentForm',
     'IPAddressAssignForm',
@@ -128,6 +129,24 @@ class AggregateForm(TenancyForm, NetBoxModelForm):
         }
 
 
+class ASNRangeForm(TenancyForm, NetBoxModelForm):
+    rir = DynamicModelChoiceField(
+        queryset=RIR.objects.all(),
+        label=_('RIR'),
+    )
+    slug = SlugField()
+    fieldsets = (
+        ('ASN Range', ('name', 'slug', 'rir', 'start', 'end', 'description', 'tags')),
+        ('Tenancy', ('tenant_group', 'tenant')),
+    )
+
+    class Meta:
+        model = ASNRange
+        fields = [
+            'name', 'slug', 'rir', 'start', 'end', 'tenant_group', 'tenant', 'description', 'tags'
+        ]
+
+
 class ASNForm(TenancyForm, NetBoxModelForm):
     rir = DynamicModelChoiceField(
         queryset=RIR.objects.all(),