diff --git a/site.conf b/site.conf
index cc29b2f..ce3a7df 100644
--- a/site.conf
+++ b/site.conf
@@ -3,8 +3,8 @@
 	site_name = 'Freifunk Bremen',
 	site_code = 'ffhb',
 
-	prefix4 = '10.196.0.0/20',
-	prefix6 = 'fd2f:5119:0f2c::/64',
+	prefix4 = '10.196.0.0/17',
+	prefix6 = '2a02:2919:1000::/64',
 
 	mesh_domains = { 'ffhb', '196.10.in-addr.arpa', 'c.2.f.0.9.1.1.5.f.2.d.f.ip6.arpa' },