diff --git a/netwerk/dns/effective_tld_names.dat b/netwerk/dns/effective_tld_names.dat
index cdffb87b6bf4..87b2f33b7adc 100644
--- a/netwerk/dns/effective_tld_names.dat
+++ b/netwerk/dns/effective_tld_names.dat
@@ -2680,6 +2680,9 @@ nl
 // BV.nl will be a registry for dutch BV's (besloten vennootschap)
 bv.nl
 
+// the co.nl domain is managed by CoDNS B.V. Added 2010-05-23.
+co.nl
+
 // no : http://www.norid.no/regelverk/index.en.html
 // The Norwegian registry has declined to notify us of updates. The web pages
 // referenced below are the official source of the data. There is also an
@@ -3447,6 +3450,9 @@ våler.østfold.no
 valer.hedmark.no
 våler.hedmark.no
 
+// the co.no domain is managed by CoDNS B.V. Added 2010-05-23.
+co.no
+
 // np : http://www.mos.com.np/register.html
 *.np