Second revision of Domain model draft

src/registrar/models/host_ip.py

@@ -0,0 +1,30 @@
+from django.db import models
+from django.core.validators import validate_ipv46_address
+
+from .utility.time_stamped_model import TimeStampedModel
+from .host import Host
+
+class HostIP(TimeStampedModel):
+    """
+    Hosts may have one or more IP addresses.
+
+    The registry is the source of truth for this data.
+
+    This model exists ONLY to allow a new registrant to draft DNS entries
+    before their application is approved.
+    """
+    address = models.CharField(
+        max_length=46,
+        null=False,
+        blank=False,
+        default=None,  # prevent saving without a value
+        validators=[validate_ipv46_address],
+        help_text="IP address",
+    )
+
+    host = models.ForeignKey(
+        Host,
+        on_delete=models.PROTECT,
+        help_text="Host to which this IP address belongs",
+    )
+