Move prefix_validator() to ipam.validators

netbox/ipam/validators.py

@@ -1,6 +1,12 @@
+from django.core.exceptions import ValidationError
 from django.core.validators import BaseValidator, RegexValidator
 
 
+def prefix_validator(prefix):
+    if prefix.ip != prefix.cidr.ip:
+        raise ValidationError("{} is not a valid prefix. Did you mean {}?".format(prefix, prefix.cidr))
+
+
 class MaxPrefixLengthValidator(BaseValidator):
     message = 'The prefix length must be less than or equal to %(limit_value)s.'
     code = 'max_prefix_length'