diff --git a/proteuscmd/__main__.py b/proteuscmd/__main__.py
index 78db6b6..8404351 100644
--- a/proteuscmd/__main__.py
+++ b/proteuscmd/__main__.py
@@ -5,6 +5,7 @@
 from proteuscmd.config import proteus_from_config
 
 __views = click.Choice(('intern', 'extern', 'all'), case_sensitive=False)
+__ip_states = click.Choice(('STATIC', 'DHCP_RESERVED'), case_sensitive=False)
 
 
 def with_proteus(f):
@@ -35,9 +36,7 @@ def dns():
 @cli.group()
 def ip():
     '''Register IP addresses.
-    Not implemented yet.
     '''
-    pass
 
 
 @dns.command()
@@ -45,7 +44,7 @@ def ip():
 @click.argument('domain')
 @with_proteus
 def get(proteus, view, domain):
-    '''Get information about a DNS entry.
+    '''Get information about a DNS recotd.
     '''
     views = proteus.get_requested_views(view)
     return {name: proteus.get_record(view, domain) for name, view in views}
@@ -57,7 +56,7 @@ def get(proteus, view, domain):
 @click.argument('target')
 @with_proteus
 def set(proteus, view, domain, target):
-    '''Set DNS entry in Proteus
+    '''Set DNS record in Proteus
     '''
     views = proteus.get_requested_views(view)
     result = {}
@@ -79,5 +78,78 @@ def delete(proteus, view, domain):
         proteus.delete_record(view, domain)
 
 
+@ip.command
+@click.argument('ip')
+@with_proteus
+def get(proteus, ip):
+    '''Get information about IPv4 address
+    '''
+    data = proteus.get_entities_by_name('default', 0, 'Configuration')
+    conf_id = data[0]['id']
+
+    data = proteus.get_ip_range_by_ip(ip, conf_id)
+    range_id = data["id"]
+
+    return proteus.get_ip4_address(ip, range_id)
+
+
+@ip.command
+@click.option('--admin-email', '-e', required=True)
+@click.option('--admin-name', '-n', required=True)
+@click.option('--admin-phone', '-p', required=True)
+@click.option('--comment', '-c')
+@click.option('--state', '-s', default='DHCP_RESERVED', type=__ip_states)
+@click.option('--hostname', '-h')
+@click.option('--view', default='all', type=__views)
+@click.option('--prop', default=[], multiple=True)
+@click.option('--force/--no-force', default=False, type=bool)
+@click.argument('ip')
+@click.argument('mac')
+@with_proteus
+def set(proteus, admin_email, admin_name, admin_phone, comment, state,
+        hostname, view, prop, force, ip, mac):
+    '''Assign IPv4 address
+    '''
+    # get notwork information
+    data = proteus.get_entities_by_name('default', 0, 'Configuration')
+    conf_id = data[0]['id']
+    range_id = proteus.get_ip_range_by_ip(ip, conf_id)['id']
+
+    # check if ip is already reserved
+    existing_address = proteus.get_ip4_address(ip, range_id)
+    if existing_address['id']:
+        if force:
+            proteus.delete_ip4_address(ip, range_id)
+        else:
+            raise ValueError('IP already reserved')
+
+    # prepare properties
+    props = {'admin_email': admin_email,
+             'admin_name': admin_name,
+             'admin_phone': admin_phone,
+             'comment': comment}
+    for extra_prop in prop:
+        k, v = extra_prop.split('=', 1)
+        props[k] = v
+    props = {k: v for k, v in props.items() if v}
+
+    proteus.assign_ip_address(conf_id, state, ip, mac, props, hostname, view)
+    return proteus.get_ip4_address(ip, range_id)
+
+
+@ip.command
+@click.argument('ip')
+@with_proteus
+def delete(proteus, ip):
+    '''Delete assigned IPv4 address
+    '''
+    # get notwork information
+    data = proteus.get_entities_by_name('default', 0, 'Configuration')
+    conf_id = data[0]['id']
+    range_id = proteus.get_ip_range_by_ip(ip, conf_id)['id']
+
+    proteus.delete_ip4_address(ip, range_id)
+
+
 if __name__ == '__main__':
     cli()
diff --git a/proteuscmd/api.py b/proteuscmd/api.py
index 6edfdfe..5a34217 100644
--- a/proteuscmd/api.py
+++ b/proteuscmd/api.py
@@ -68,6 +68,14 @@ def __record_type_from_target(self, target):
         except ValueError:
             return 'AliasRecord'
 
+    def __parse_properties(self, properties):
+        '''Take the property string returned by Proteus and turn it into a
+        dictionary containing the key-value pairs.
+        '''
+        properties = properties.split('|')
+        properties = [prop.split('=', 1) for prop in properties if prop]
+        return {prop[0]: prop[1] for prop in properties}
+
     def login(self):
         '''Logging in at Proteus.
         '''
@@ -128,7 +136,15 @@ def get_ip_range_by_ip(self, ip, conf_id):
 
     def get_ip4_address(self, ip, range_id):
         params = {'address': ip, 'containerId': range_id}
-        return self.__get('getIP4Address', params=params)
+        data = self.__get('getIP4Address', params=params)
+        if data.get('properties'):
+            data['properties'] = self.__parse_properties(data['properties'])
+        return data
+
+    def delete_ip4_address(self, ip, range_id):
+        object_id = self.get_ip4_address(ip, range_id)['id']
+        payload = {'objectId': object_id}
+        return self.__delete('delete', payload)
 
     def get_requested_views(self, view_arg):
         '''Get requested views.
@@ -170,9 +186,7 @@ def get_record(self, view, domain):
         data = self.get_entities_by_name(host, parent, 'HostRecord') \
             + self.get_entities_by_name(host, parent, 'AliasRecord')
         for record in data:
-            properties = record['properties'].split('|')
-            properties = [prop.split('=', 1) for prop in properties if prop]
-            return {prop[0]: prop[1] for prop in properties}
+            return self.__parse_properties(record['properties'])
         return {}
 
     def set_record(self, view, domain, target):