diff --git a/.gitignore b/.gitignore
index e7f55736..5b067dce 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,6 +12,7 @@
 /querylog.json
 /querylog.json.1
 coverage.txt
+leases.db
 
 # Test output
 dnsfilter/tests/top-1m.csv
diff --git a/internal/dhcpd/v4.go b/internal/dhcpd/v4.go
index 686ee32f..81ba3a1d 100644
--- a/internal/dhcpd/v4.go
+++ b/internal/dhcpd/v4.go
@@ -581,6 +581,11 @@ func (s *v4Server) Start() error {
 		return fmt.Errorf("dhcpv4: interface %s: %w", ifaceName, err)
 	}
 
+	if len(dnsIPAddrs) == 0 {
+		// No available IP addresses which may appear later.
+		return nil
+	}
+
 	s.conf.dnsIPAddrs = dnsIPAddrs
 
 	laddr := &net.UDPAddr{
diff --git a/internal/dhcpd/v6.go b/internal/dhcpd/v6.go
index 300788e6..7b13dcfd 100644
--- a/internal/dhcpd/v6.go
+++ b/internal/dhcpd/v6.go
@@ -579,6 +579,11 @@ func (s *v6Server) Start() error {
 		return fmt.Errorf("dhcpv6: interface %s: %w", ifaceName, err)
 	}
 
+	if len(dnsIPAddrs) == 0 {
+		// No available IP addresses which may appear later.
+		return nil
+	}
+
 	s.conf.dnsIPAddrs = dnsIPAddrs
 
 	err = s.initRA(iface)