--- a/bin/pvl.hosts-forward	Mon Mar 09 19:47:10 2015 +0200
+++ b/bin/pvl.hosts-forward	Mon Mar 09 19:48:19 2015 +0200
@@ -5,6 +5,7 @@
 import os.path
 import pvl.args
 import pvl.hosts
+import pvl.hosts.interface
 import pvl.hosts.zone
 
 def main (argv):

--- a/bin/pvl.hosts-reverse	Mon Mar 09 19:47:10 2015 +0200
+++ b/bin/pvl.hosts-reverse	Mon Mar 09 19:48:19 2015 +0200
@@ -5,6 +5,7 @@
 import os.path
 import pvl.args
 import pvl.hosts
+import pvl.hosts.interface
 import pvl.hosts.zone
 
 def main (argv):

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pvl/hosts/interface.py	Mon Mar 09 19:48:19 2015 +0200
@@ -0,0 +1,32 @@
+import ipaddress, ipaddr # XXX: conversion
+import pvl.hosts
+
+def parse_interfaces(interfaces):
+    for interface, value in interfaces.iteritems():
+        if not isinstance(value, dict):
+            yield (interface, 0), ipaddress.ip_interface(value)
+        else:
+            for unit, ip in value.iteritems():
+                yield (interface, int(unit)), ipaddress.ip_interface(value)
+
+@pvl.hosts.extension
+class HostInterface(object):
+    EXTENSION = 'interface'
+
+    @classmethod
+    def build (cls, **interfaces):
+        return cls(dict(parse_interfaces(interfaces)))
+
+    def __init__ (self, interfaces):
+        self.interfaces = interfaces
+
+    def iter_interfaces (self):
+        for (iface, unit), ip in self.interfaces.iteritems():
+            family = {4: 'inet', 6: 'inet6' }[ip.version]
+
+            yield iface, unit, family, ip
+
+    def addresses (self):
+        for (iface, unit), ip in self.interfaces.iteritems():
+            # XXX: ipaddr
+            yield iface, ipaddr.IPAddress(str(ip.ip))