diff --git a/howto/Bird.md b/howto/Bird.md
index c3f879e..3c8f5a2 100644
--- a/howto/Bird.md
+++ b/howto/Bird.md
@@ -108,91 +108,12 @@ define OWNIP = <GATEWAY_IP>;
 function is_self_net() {
   return net ~ [<SUBNET>+];
 }
-```
 
-Generate the filter list from the monotone repository
-
-```
-$ cd net.dn42.registry
-$ ruby utils/bgp-filter.rb --format bird < data/filter6.txt > /etc/bird/filter6.conf
-
-or
-
-$ curl -s https://ca.dn42.us/reg/filter6.txt | \
-    awk '/^[0-9]/ && $2 ~ /permit/ {printf "%s{%s,%s}\n", $3, $4, $5}' | \
-    awk 'BEGIN {printf "function is_valid_network() {\n return net ~ [\n"} \
-        NR > 1 {printf ",\n"} {printf "  %s", $1}
-        END {printf "\n ];\n}\n"}' > /etc/bird/filter6.conf
-```
-
-example filter list:
-
-```
 function is_valid_network() {
   return net ~ [
-    fc00::/8{48,64}, # ULA (undefined)
-    fd00::/8{48,64}, # ULA (defined)
-    2001:67c:20c1::/48{48,48}, # E-UTP IPv6
-    2001:bf7::/32{32,128}, # Freifunk (Foerderverein Freie Netzwerke) IPv6 Range
-    2001:67c:20a1::/48{48,48}, # CCC Event Network
-    2001:0470:006c:01d5::/64{64,64}, # Registered IANA
-    2001:0470:006d:0655::/64{64,64},
-    2001:0470:1f09:172d::/64{64,64},
-    2001:0470:1f0b:0592::/64{64,64},
-    2001:0470:1f0b:0bca::/64{64,64},
-    2001:0470:1f0b:1af5::/64{64,64},
-    2001:0470:1f10:0275::/64{64,64},
-    2001:0470:1f12:0004::/64{64,64},
-    2001:0470:5084::/48{48,64},
-    2001:0470:51c6::/48{48,64},
-    2001:0470:73d3::/48{48,64},
-    2001:0470:7972::/48{48,64},
-    2001:0470:9949::/48{48,64},
-    2001:0470:99fc::/48{48,64},
-    2001:0470:9af8::/48{48,64},
-    2001:0470:9ce6::/55{55,64},
-    2001:0470:9f43::/48{48,64},
-    2001:0470:caab::/48{48,64},
-    2001:0470:cd99::/48{48,64},
-    2001:0470:d4df::/48{48,64},
-    2001:0470:d889:0010::/64{64,64},
-    2001:0470:e3f0:000a::/64{64,64},
-    2001:067c:21ec::/48{48,64},
-    2001:06f8:1019:0000::/64{64,64},
-    2001:06f8:118b::/48{48,64},
-    2001:06f8:1194::/48{48,64},
-    2001:06f8:121a::/48{48,64},
-    2001:06f8:1c1b::/48{48,64},
-    2001:06f8:1d14::/48{48,64},
-    2001:06f8:1d26::/48{48,64},
-    2001:06f8:1d53::/48{48,64},
-    2001:07f0:3003::/48{48,64},
-    2001:08d8:0081:05c8::/63{63,64},  
-    2001:08d8:0081:05ca::/64{64,64},
-    2001:15c0:1000:0100::/64{64,64},
-    2001:1b60:1000:0001::/64{64,64},
-    2001:41d0:0001:b6bb::/64{64,64},
-    2001:41d0:0001:cd42::/64{64,64},
-    2001:4dd0:fcff::/48{48,64},
-    2001:4dd0:fdd3::/48{48,64},
-    2001:4dd0:ff00:8710::/64{64,64},
-    2604:8800:0179:4200::/56{56,64},
-    2801:0000:80:8000::/50{50,64},
-    2a00:1328:e101:0200::/56{56,64},
-    2a00:1828:2000:0289::/64{64,64},
-    2a00:1828:a013:d242::/64{64,64},
-    2a00:5540:0387::/48{48,64},
-    2a01:0198:022c::/48{48,64},
-    2a01:0198:035a:fd13::/64{64,64},
-    2a01:0198:0485::/48{48,64},
-    2a01:04f8:0121:4fff::/64{64,64},
-    2a01:04f8:0140:1ffd::/64{64,64},
-    2a01:04f8:0d13:17c0::/64{64,64},
-    2a02:0a00:e010:3c00::/56{56,64},
-    2a02:0ee0:0002:0051::/64{64,64},
-    2a03:2260::/30{30,64}
-  ];
-} 
+    'fd00::/8' # ULA address space as per RFC 4193
+  ]
+}
 ```
 
 ```
@@ -297,52 +218,18 @@ define OWNIP = <GATEWAY_IP>;
 function is_self_net() {
   return net ~ [<SUBNET>+];
 }
-```
 
-Generate the filter list from the monotone repository
-
-```
-$ cd net.dn42.registry
-$ ruby utils/bgp-filter.rb --format bird < data/filter.txt > /var/lib/bird/filter4.conf
-
-or
-
-$ curl -s https://ca.dn42.us/reg/filter.txt | \
-    awk '/^[0-9]/ && $2 ~ /permit/ {printf "%s{%s,%s}\n", $3, $4, $5}' | \
-    awk 'BEGIN {printf "function is_valid_network() {\n return net ~ [\n"} \
-        NR > 1 {printf ",\n"} {printf "  %s", $1}
-        END {printf "\n ];\n}\n"}' > /var/lib/bird/filter4.conf
-```
-
-example filter list:
-
-```
 function is_valid_network() {
   return net ~ [
-    172.20.0.0/14{21,29}, # dn42 main net
-    172.20.0.0/24{28,32}, # dn42 Anycast range
-    172.21.0.0/24{28,32}, # dn42 Anycast range
-    172.22.0.0/24{28,32}, # dn42 Anycast range
-    172.23.0.0/24{28,32}, # dn42 Anycast range
-    192.175.48.0/24{24,32}, # AS112-prefix for reverse-dns  
-    10.0.0.0/8{12,28}, # freifunk/chaosvpn
-    172.31.0.0/16{22,28}, # chaosvpn
-    100.64.0.0/10{12,28}, # iana private range
-    195.160.168.0/23{23,28}, # ctdo
-    91.204.4.0/22{22,28}, # free.de via ctdo
-    193.43.220.0/23{23,28}, # durchdieluft via ctdo
-    83.133.178.0/23{23,28}, # muccc kapsel
-    87.106.29.254/32{32,32}, # wintix (please don' announce /32)
-    85.25.246.16/28{28,32}, # leon
-    46.4.248.192/27{27,32}, # welterde
-    94.45.224.0/19{19,28}, # ccc event network
-    151.217.0.0/16{16,28}, # ccc event network 2
-    195.191.196.0/23{23,29}, # ichdasich pi space
-    80.244.241.224/27{27,32}, # jchome service network
-    188.40.34.241/32{32,32},
-    37.1.89.192/26{26,28}, # siska
-    87.98.246.19/32{32,32}
-  ];
+    172.20.0.0/14{21,29}, # dn42
+    172.20.0.0/24{28,32}, # dn42 Anycast
+    172.21.0.0/24{28,32}, # dn42 Anycast
+    172.22.0.0/24{28,32}, # dn42 Anycast
+    172.23.0.0/24{28,32}, # dn42 Anycast
+    172.31.0.0/16+,       # ChaosVPN
+    10.100.0.0/14+,       # ChaosVPN
+    10.0.0.0/8{15,22}     # Freifunk.net
+  ]
 }
 ```