diff --git a/nsupdate/api/views.py b/nsupdate/api/views.py
index 1b6e4c7..b58098d 100644
--- a/nsupdate/api/views.py
+++ b/nsupdate/api/views.py
@@ -255,6 +255,14 @@ class AuthorizedNicUpdateView(View):
 
 
 def _update(host, hostname, ipaddr, agent='unknown', ssl=False, logger=None):
+    # we are doing abuse / available checks rather late, so the client might
+    # get more specific responses (like 'badagent' or 'notfqdn') by earlier
+    # checks. it also avoids some code duplication if done here:
+    if host.abuse or host.abuse_blocked:
+        return Response('abuse')
+    if not host.available:
+        # not available is like it doesn't exist
+        return Response('nohost')
     ipaddr = str(ipaddr)  # bug in dnspython: crashes if ipaddr is unicode, wants a str!
                           # https://github.com/rthalley/dnspython/issues/41
                           # TODO: reproduce and submit traceback to issue 41
diff --git a/nsupdate/main/forms.py b/nsupdate/main/forms.py
index 01c6491..ae41d31 100644
--- a/nsupdate/main/forms.py
+++ b/nsupdate/main/forms.py
@@ -16,7 +16,7 @@ class CreateHostForm(forms.ModelForm):
 class EditHostForm(forms.ModelForm):
     class Meta(object):
         model = Host
-        fields = ['comment']
+        fields = ['comment', 'available', 'abuse']
 
 
 class CreateDomainForm(forms.ModelForm):
diff --git a/nsupdate/main/migrations/0023_auto__add_field_host_available__add_field_host_abuse__add_field_host_a.py b/nsupdate/main/migrations/0023_auto__add_field_host_available__add_field_host_abuse__add_field_host_a.py
new file mode 100644
index 0000000..22a2db6
--- /dev/null
+++ b/nsupdate/main/migrations/0023_auto__add_field_host_available__add_field_host_abuse__add_field_host_a.py
@@ -0,0 +1,148 @@
+# -*- coding: utf-8 -*-
+import datetime
+from south.db import db
+from south.v2 import SchemaMigration
+from django.db import models
+
+
+class Migration(SchemaMigration):
+
+    def forwards(self, orm):
+        # Adding field 'Host.available'
+        db.add_column(u'main_host', 'available',
+                      self.gf('django.db.models.fields.BooleanField')(default=True),
+                      keep_default=False)
+
+        # Adding field 'Host.abuse'
+        db.add_column(u'main_host', 'abuse',
+                      self.gf('django.db.models.fields.BooleanField')(default=False),
+                      keep_default=False)
+
+        # Adding field 'Host.abuse_blocked'
+        db.add_column(u'main_host', 'abuse_blocked',
+                      self.gf('django.db.models.fields.BooleanField')(default=False),
+                      keep_default=False)
+
+
+    def backwards(self, orm):
+        # Deleting field 'Host.available'
+        db.delete_column(u'main_host', 'available')
+
+        # Deleting field 'Host.abuse'
+        db.delete_column(u'main_host', 'abuse')
+
+        # Deleting field 'Host.abuse_blocked'
+        db.delete_column(u'main_host', 'abuse_blocked')
+
+
+    models = {
+        u'auth.group': {
+            'Meta': {'object_name': 'Group'},
+            u'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'name': ('django.db.models.fields.CharField', [], {'unique': 'True', 'max_length': '80'}),
+            'permissions': ('django.db.models.fields.related.ManyToManyField', [], {'to': u"orm['auth.Permission']", 'symmetrical': 'False', 'blank': 'True'})
+        },
+        u'auth.permission': {
+            'Meta': {'ordering': "(u'content_type__app_label', u'content_type__model', u'codename')", 'unique_together': "((u'content_type', u'codename'),)", 'object_name': 'Permission'},
+            'codename': ('django.db.models.fields.CharField', [], {'max_length': '100'}),
+            'content_type': ('django.db.models.fields.related.ForeignKey', [], {'to': u"orm['contenttypes.ContentType']"}),
+            u'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '50'})
+        },
+        u'auth.user': {
+            'Meta': {'object_name': 'User'},
+            'date_joined': ('django.db.models.fields.DateTimeField', [], {'default': 'datetime.datetime.now'}),
+            'email': ('django.db.models.fields.EmailField', [], {'max_length': '75', 'blank': 'True'}),
+            'first_name': ('django.db.models.fields.CharField', [], {'max_length': '30', 'blank': 'True'}),
+            'groups': ('django.db.models.fields.related.ManyToManyField', [], {'to': u"orm['auth.Group']", 'symmetrical': 'False', 'blank': 'True'}),
+            u'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'is_active': ('django.db.models.fields.BooleanField', [], {'default': 'True'}),
+            'is_staff': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'is_superuser': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'last_login': ('django.db.models.fields.DateTimeField', [], {'default': 'datetime.datetime.now'}),
+            'last_name': ('django.db.models.fields.CharField', [], {'max_length': '30', 'blank': 'True'}),
+            'password': ('django.db.models.fields.CharField', [], {'max_length': '128'}),
+            'user_permissions': ('django.db.models.fields.related.ManyToManyField', [], {'to': u"orm['auth.Permission']", 'symmetrical': 'False', 'blank': 'True'}),
+            'username': ('django.db.models.fields.CharField', [], {'unique': 'True', 'max_length': '30'})
+        },
+        u'contenttypes.contenttype': {
+            'Meta': {'ordering': "('name',)", 'unique_together': "(('app_label', 'model'),)", 'object_name': 'ContentType', 'db_table': "'django_content_type'"},
+            'app_label': ('django.db.models.fields.CharField', [], {'max_length': '100'}),
+            u'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'model': ('django.db.models.fields.CharField', [], {'max_length': '100'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '100'})
+        },
+        u'main.blacklisteddomain': {
+            'Meta': {'object_name': 'BlacklistedDomain'},
+            'created': ('django.db.models.fields.DateTimeField', [], {'auto_now_add': 'True', 'blank': 'True'}),
+            'created_by': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'blacklisted_domains'", 'to': u"orm['auth.User']"}),
+            'domain': ('django.db.models.fields.CharField', [], {'unique': 'True', 'max_length': '255'}),
+            u'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'last_update': ('django.db.models.fields.DateTimeField', [], {'auto_now': 'True', 'blank': 'True'})
+        },
+        u'main.domain': {
+            'Meta': {'object_name': 'Domain'},
+            'available': ('django.db.models.fields.BooleanField', [], {'default': 'True'}),
+            'comment': ('django.db.models.fields.CharField', [], {'default': "''", 'max_length': '255', 'null': 'True', 'blank': 'True'}),
+            'created': ('django.db.models.fields.DateTimeField', [], {'auto_now_add': 'True', 'blank': 'True'}),
+            'created_by': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'domains'", 'to': u"orm['auth.User']"}),
+            'domain': ('django.db.models.fields.CharField', [], {'unique': 'True', 'max_length': '255'}),
+            u'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'last_update': ('django.db.models.fields.DateTimeField', [], {'auto_now': 'True', 'blank': 'True'}),
+            'nameserver_ip': ('django.db.models.fields.GenericIPAddressField', [], {'max_length': '39'}),
+            'nameserver_update_algorithm': ('django.db.models.fields.CharField', [], {'default': "'HMAC_SHA512'", 'max_length': '16'}),
+            'nameserver_update_secret': ('django.db.models.fields.CharField', [], {'default': "''", 'max_length': '88'}),
+            'public': ('django.db.models.fields.BooleanField', [], {'default': 'False'})
+        },
+        u'main.host': {
+            'Meta': {'unique_together': "(('subdomain', 'domain'),)", 'object_name': 'Host'},
+            'abuse': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'abuse_blocked': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'available': ('django.db.models.fields.BooleanField', [], {'default': 'True'}),
+            'client_faults': ('django.db.models.fields.PositiveIntegerField', [], {'default': '0'}),
+            'comment': ('django.db.models.fields.CharField', [], {'default': "''", 'max_length': '255', 'null': 'True', 'blank': 'True'}),
+            'created': ('django.db.models.fields.DateTimeField', [], {'auto_now_add': 'True', 'blank': 'True'}),
+            'created_by': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'hosts'", 'to': u"orm['auth.User']"}),
+            'domain': ('django.db.models.fields.related.ForeignKey', [], {'to': u"orm['main.Domain']"}),
+            u'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'last_update': ('django.db.models.fields.DateTimeField', [], {'auto_now': 'True', 'blank': 'True'}),
+            'last_update_ipv4': ('django.db.models.fields.DateTimeField', [], {'null': 'True', 'blank': 'True'}),
+            'last_update_ipv6': ('django.db.models.fields.DateTimeField', [], {'null': 'True', 'blank': 'True'}),
+            'server_faults': ('django.db.models.fields.PositiveIntegerField', [], {'default': '0'}),
+            'ssl_update_ipv4': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'ssl_update_ipv6': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'subdomain': ('django.db.models.fields.CharField', [], {'max_length': '255'}),
+            'update_secret': ('django.db.models.fields.CharField', [], {'max_length': '64'})
+        },
+        u'main.serviceupdater': {
+            'Meta': {'object_name': 'ServiceUpdater'},
+            'accept_ipv4': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'accept_ipv6': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'comment': ('django.db.models.fields.CharField', [], {'default': "''", 'max_length': '255', 'null': 'True', 'blank': 'True'}),
+            'created': ('django.db.models.fields.DateTimeField', [], {'auto_now_add': 'True', 'blank': 'True'}),
+            'created_by': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'serviceupdater'", 'to': u"orm['auth.User']"}),
+            u'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'last_update': ('django.db.models.fields.DateTimeField', [], {'auto_now': 'True', 'blank': 'True'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '32'}),
+            'path': ('django.db.models.fields.CharField', [], {'default': "'/nic/update'", 'max_length': '255'}),
+            'secure': ('django.db.models.fields.BooleanField', [], {'default': 'True'}),
+            'server': ('django.db.models.fields.CharField', [], {'max_length': '255'})
+        },
+        u'main.serviceupdaterhostconfig': {
+            'Meta': {'object_name': 'ServiceUpdaterHostConfig'},
+            'comment': ('django.db.models.fields.CharField', [], {'default': "''", 'max_length': '255', 'null': 'True', 'blank': 'True'}),
+            'created': ('django.db.models.fields.DateTimeField', [], {'auto_now_add': 'True', 'blank': 'True'}),
+            'created_by': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'serviceupdaterhostconfigs'", 'to': u"orm['auth.User']"}),
+            'give_ipv4': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'give_ipv6': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
+            'host': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'serviceupdaterhostconfigs'", 'to': u"orm['main.Host']"}),
+            'hostname': ('django.db.models.fields.CharField', [], {'default': "''", 'max_length': '255', 'null': 'True', 'blank': 'True'}),
+            u'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'last_update': ('django.db.models.fields.DateTimeField', [], {'auto_now': 'True', 'blank': 'True'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '255'}),
+            'password': ('django.db.models.fields.CharField', [], {'max_length': '255'}),
+            'service': ('django.db.models.fields.related.ForeignKey', [], {'to': u"orm['main.ServiceUpdater']"})
+        }
+    }
+
+    complete_apps = ['main']
\ No newline at end of file
diff --git a/nsupdate/main/models.py b/nsupdate/main/models.py
index eeebb51..ffb662b 100644
--- a/nsupdate/main/models.py
+++ b/nsupdate/main/models.py
@@ -124,6 +124,31 @@ class Host(models.Model):
         default='', blank=True, null=True,
         help_text="Some arbitrary comment about your host, e.g  who / what / where this host is")
 
+    # available means that this host may be updated (or not, if False) -
+    # gets set to False if abuse happens (client malfunctioning) or
+    # if updating this host triggers other errors:
+    available = models.BooleanField(
+        default=True,
+        help_text="Check if host is available/in use - "
+                  "if not checked, we won't accept updates for this host")
+
+    # abuse means that we (either the operator or some automatic mechanism)
+    # think the host is used in some abusive or unfair way, e.g.:
+    # sending nochg updates way too often or otherwise using a defect,
+    # misconfigured or otherwise malfunctioning update client
+    # acting against fair use / ToS.
+    # the abuse flag can be switched off by the user, if the user thinks
+    # he fixed the problem on his side (or that there was no problem).
+    abuse = models.BooleanField(
+        default=False,
+        help_text="Checked if we think you abuse the service - "
+                  "you may uncheck this AFTER fixing all issues on your side")
+
+    # similar to above, but can not be toggled by the user:
+    abuse_blocked = models.BooleanField(
+        default=False,
+        help_text="Checked to block a host for abuse.")
+
     # count client misbehaviours, like sending nochg updates or other
     # errors that should make the client stop trying to update:
     client_faults = models.PositiveIntegerField(default=0)
diff --git a/nsupdate/main/templates/main/host.html b/nsupdate/main/templates/main/host.html
index b260ef3..ff9d265 100644
--- a/nsupdate/main/templates/main/host.html
+++ b/nsupdate/main/templates/main/host.html
@@ -6,7 +6,6 @@
         <h3>{{ host.get_fqdn }} <br><small><a href="{% url 'overview' %}"><i class="fa fa-angle-double-left"></i> back to overview</a></small></h3>
         <div class="col-lg-4">
             <h3>Edit Host</h3>
-            <p>You can only change the comment. If you want to have another host name, you have to delete this host and create a new one.</p>
             <form method="post" action="">
                 {% csrf_token %}
                 {{ form|bootstrap }}
diff --git a/nsupdate/main/templates/main/overview.html b/nsupdate/main/templates/main/overview.html
index f6cbc91..4f5c2d8 100644
--- a/nsupdate/main/templates/main/overview.html
+++ b/nsupdate/main/templates/main/overview.html
@@ -9,6 +9,7 @@
             <thead>
                 <tr>
                     <th>Host</th>
+                    <th>Available</th>
                     <th>Faults</th>
                     <th>IPv4 Address</th>
                     <th>IPv6 Address</th>
@@ -18,7 +19,8 @@
             {% for host in hosts %}
                 <tr>
                     <td><a href="{% url 'host_view' host.pk %}"><b>{{ host.subdomain }}.{{ host.domain.domain }}</b></a></td>
-                    <td>C: {{ host.client_faults }} S: {{ host.server_faults }}</td>
+                    <td>{{ host.available|yesno }}</td>
+                    <td>C: {{ host.client_faults }} S: {{ host.server_faults }}{% if host.abuse_blocked %} ABUSE-BLOCKED{% elif host.abuse %} ABUSE{% endif %}</td>
                     <td>{{ host.get_ipv4 }} ({{ host.last_update_ipv4|timesince }}, {% if not host.ssl_update_ipv4 %}no {% endif %}SSL)</td>
                     <td>{{ host.get_ipv6 }} ({{ host.last_update_ipv6|timesince }}, {% if not host.ssl_update_ipv6 %}no {% endif %}SSL)</td>
                     <td>{{ host.comment }}</td>
diff --git a/nsupdate/management/commands/faults.py b/nsupdate/management/commands/faults.py
index c084139..9283023 100644
--- a/nsupdate/management/commands/faults.py
+++ b/nsupdate/management/commands/faults.py
@@ -38,6 +38,24 @@ class Command(BaseCommand):
                     default=False,
                     help='reset the client faults counters of all hosts',
         ),
+        make_option('--reset-abuse',
+                    action='store_true',
+                    dest='reset_abuse',
+                    default=False,
+                    help='reset the abuse flag (to False) of all hosts',
+        ),
+        make_option('--reset-abuse-blocked',
+                    action='store_true',
+                    dest='reset_abuse_blocked',
+                    default=False,
+                    help='reset the abuse_blocked flag (to False) of all hosts',
+        ),
+        make_option('--reset-available',
+                    action='store_true',
+                    dest='reset_available',
+                    default=True,
+                    help='reset the available flag (to True) of all hosts',
+        ),
     )
 
     def handle(self, *args, **options):
@@ -45,6 +63,9 @@ class Command(BaseCommand):
         show_server = options['show_server']
         reset_client = options['reset_client']
         reset_server = options['reset_server']
+        reset_available = options['reset_available']
+        reset_abuse = options['reset_abuse']
+        reset_abuse_blocked = options['reset_abuse_blocked']
         for h in Host.objects.all():
             if show_client or show_server:
                 output = u""
@@ -54,9 +75,15 @@ class Command(BaseCommand):
                     output += u"%-6d " % h.server_faults
                 output += u"%s %s\n" % (h.created_by.username, h.get_fqdn(), )
                 self.stdout.write(output)
-            if reset_client or reset_server:
+            if reset_client or reset_server or reset_available or reset_abuse or reset_abuse_blocked:
                 if reset_client:
                     h.client_faults = 0
                 if reset_server:
                     h.server_faults = 0
+                if reset_available:
+                    h.available = True
+                if reset_abuse:
+                    h.abuse = False
+                if reset_abuse_blocked:
+                    h.abuse_blocked = False
                 h.save()