diff --git a/regress/Nsd.pm b/regress/Nsd.pm
index 2562dfe..214146a 100644
--- a/regress/Nsd.pm
+++ b/regress/Nsd.pm
@@ -21,6 +21,7 @@ package Nsd;
 use parent 'Proc';
 use Carp;
 use File::Basename;
+use Socket;
 use Sys::Hostname;
 
 sub new {
@@ -44,6 +45,14 @@ sub new {
 	print $fh "# test $test\n";
 	print $fh "server:\n";
 	print $fh "	chroot: \"\"\n";
+	if ($self->{listen}{domain} && $self->{listen}{domain} == AF_INET) {
+		print $fh "	do-ip4: yes\n";
+		print $fh "	do-ip6: no\n";
+	}
+	if ($self->{listen}{domain} && $self->{listen}{domain} == AF_INET6) {
+		print $fh "	do-ip4: no\n";
+		print $fh "	do-ip6: yes\n";
+	}
 	print $fh "	ip-address: $self->{addr}\n";
 	print $fh "	pidfile: \"\"\n";
 	print $fh "	port: $self->{port}\n";
diff --git a/regress/args-nsd.pl b/regress/args-nsd.pl
index 99ebeee..2536174 100644
--- a/regress/args-nsd.pl
+++ b/regress/args-nsd.pl
@@ -6,22 +6,30 @@
 # Read IP addresses from pf table with pfctl.
 # Check that pfresolved added IPv4 and IPv6 addresses.
 # Check that pf table contains all IPv4 and IPv6 addresses.
+# Check that IPv4 127.0.0.1 socket was used.
 
 use strict;
 use warnings;
+use Socket;
 
 our %args = (
     nsd => {
+	listen => { domain => AF_INET, addr => "127.0.0.1" },
 	record_list => [
 	    "foo	IN	A	192.0.2.1",
 	    "bar	IN	AAAA	2001:DB8::1",
 	    "foobar	IN	A	192.0.2.2",
 	    "foobar	IN	AAAA	2001:DB8::2",
 	],
+	loggrep => {
+	    qr/listen on ip-address 127.0.0.1\@\d+ \(udp\)/ => 1,
+	    qr/listen on ip-address [0-9A-Fa-f:]+\@\d+ / => 0,
+	},
     },
     pfresolved => {
 	address_list => [ map { "$_.regress." } qw(foo bar foobar) ],
 	loggrep => {
+	    qr/-r 127.0.0.1\@\d+/ => 1,
 	    qr{added: 192.0.2.1/32,} => 1,
 	    qr{added: 2001:db8::1/128,} => 1,
 	    qr{added: 192.0.2.2/32,} => 1,
diff --git a/regress/args-nsd6.pl b/regress/args-nsd6.pl
new file mode 100644
index 0000000..4b68835
--- /dev/null
+++ b/regress/args-nsd6.pl
@@ -0,0 +1,48 @@
+# Create zone file with A and AAAA records in zone regress.
+# Start nsd with zone file listening on ::1.
+# Write hosts of regress zone into pfresolved config.
+# Start pfresolved with nsd as resolver.
+# Wait until pfresolved creates table regress-pfresolved.
+# Read IP addresses from pf table with pfctl.
+# Check that pfresolved added IPv4 and IPv6 addresses.
+# Check that pf table contains all IPv4 and IPv6 addresses.
+# Check that IPv6 ::1 socket was used.
+
+use strict;
+use warnings;
+use Socket;
+
+our %args = (
+    nsd => {
+	listen => { domain => AF_INET6, addr => "::1" },
+	record_list => [
+	    "foo	IN	A	192.0.2.1",
+	    "bar	IN	AAAA	2001:DB8::1",
+	    "foobar	IN	A	192.0.2.2",
+	    "foobar	IN	AAAA	2001:DB8::2",
+	],
+	loggrep => {
+	    qr/listen on ip-address [0-9.]\@\d+ / => 0,
+	    qr/listen on ip-address ::1\@\d+ \(udp\) / => 1,
+	},
+    },
+    pfresolved => {
+	address_list => [ map { "$_.regress." } qw(foo bar foobar) ],
+	loggrep => {
+	    qr/-r ::1\@\d+/ => 1,
+	    qr{added: 192.0.2.1/32,} => 1,
+	    qr{added: 2001:db8::1/128,} => 1,
+	    qr{added: 192.0.2.2/32,} => 1,
+	    qr{added: 2001:db8::2/128,} => 1,
+	},
+    },
+    pfctl => {
+	updated => [4, 1],
+	loggrep => {
+	    qr/^   192.0.2.[12]$/ => 2,
+	    qr/^   2001:db8::[12]$/ => 2,
+	},
+    },
+);
+
+1;