diff --git a/netbox/circuits/migrations/0003_provider_32bit_asn_support.py b/netbox/circuits/migrations/0003_provider_32bit_asn_support.py
new file mode 100644
index 000000000..f1010064e
--- /dev/null
+++ b/netbox/circuits/migrations/0003_provider_32bit_asn_support.py
@@ -0,0 +1,21 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9.7 on 2016-07-13 19:24
+from __future__ import unicode_literals
+
+import dcim.fields
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('circuits', '0002_auto_20160622_1821'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='provider',
+            name='asn',
+            field=dcim.fields.ASNField(blank=True, null=True, verbose_name=b'ASN'),
+        ),
+    ]
diff --git a/netbox/circuits/models.py b/netbox/circuits/models.py
index d785eb1f2..c7c60378e 100644
--- a/netbox/circuits/models.py
+++ b/netbox/circuits/models.py
@@ -1,6 +1,7 @@
 from django.core.urlresolvers import reverse
 from django.db import models
 
+from dcim.fields import ASNField
 from dcim.models import Site, Interface
 from utilities.models import CreatedUpdatedModel
 
@@ -12,7 +13,7 @@ class Provider(CreatedUpdatedModel):
     """
     name = models.CharField(max_length=50, unique=True)
     slug = models.SlugField(unique=True)
-    asn = models.PositiveIntegerField(blank=True, null=True, verbose_name='ASN')
+    asn = ASNField(blank=True, null=True, verbose_name='ASN')
     account = models.CharField(max_length=30, blank=True, verbose_name='Account number')
     portal_url = models.URLField(blank=True, verbose_name='Portal')
     noc_contact = models.TextField(blank=True, verbose_name='NOC contact')
diff --git a/netbox/dcim/fields.py b/netbox/dcim/fields.py
index e00b1115f..6b45f6e65 100644
--- a/netbox/dcim/fields.py
+++ b/netbox/dcim/fields.py
@@ -1,11 +1,20 @@
 from netaddr import EUI, mac_unix_expanded
 
 from django.core.exceptions import ValidationError
+from django.core.validators import MinValueValidator, MaxValueValidator
 from django.db import models
 
 from .formfields import MACAddressFormField
 
 
+class ASNField(models.BigIntegerField):
+    description = "32-bit ASN field"
+    default_validators = [
+        MinValueValidator(1),
+        MaxValueValidator(4294967295),
+    ]
+
+
 class mac_unix_expanded_uppercase(mac_unix_expanded):
     word_fmt = '%.2X'
 
diff --git a/netbox/dcim/migrations/0009_site_32bit_asn_support.py b/netbox/dcim/migrations/0009_site_32bit_asn_support.py
new file mode 100644
index 000000000..c93340cea
--- /dev/null
+++ b/netbox/dcim/migrations/0009_site_32bit_asn_support.py
@@ -0,0 +1,21 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9.7 on 2016-07-13 19:24
+from __future__ import unicode_literals
+
+import dcim.fields
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('dcim', '0008_device_remove_primary_ip'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='site',
+            name='asn',
+            field=dcim.fields.ASNField(blank=True, null=True, verbose_name=b'ASN'),
+        ),
+    ]
diff --git a/netbox/dcim/models.py b/netbox/dcim/models.py
index c51714a71..8bf97224c 100644
--- a/netbox/dcim/models.py
+++ b/netbox/dcim/models.py
@@ -11,7 +11,7 @@ from extras.rpc import RPC_CLIENTS
 from utilities.fields import NullableCharField
 from utilities.models import CreatedUpdatedModel
 
-from .fields import MACAddressField
+from .fields import ASNField, MACAddressField
 
 RACK_FACE_FRONT = 0
 RACK_FACE_REAR = 1
@@ -145,7 +145,7 @@ class Site(CreatedUpdatedModel):
     name = models.CharField(max_length=50, unique=True)
     slug = models.SlugField(unique=True)
     facility = models.CharField(max_length=50, blank=True)
-    asn = models.PositiveIntegerField(blank=True, null=True, verbose_name='ASN')
+    asn = ASNField(blank=True, null=True, verbose_name='ASN')
     physical_address = models.CharField(max_length=200, blank=True)
     shipping_address = models.CharField(max_length=200, blank=True)
     comments = models.TextField(blank=True)