diff --git a/fail2ban/server/ipdns.py b/fail2ban/server/ipdns.py
index a5625629..757cceba 100644
--- a/fail2ban/server/ipdns.py
+++ b/fail2ban/server/ipdns.py
@@ -64,16 +64,19 @@ class DNSUtils:
 		if ips is not None: 
 			return ips
 		# retrieve ips
-		try:
-			ips = list()
-			for result in socket.getaddrinfo(dns, None, 0, 0, socket.IPPROTO_TCP):
-				ip = IPAddr(result[4][0])
-				if ip.isValid:
-					ips.append(ip)
-		except socket.error as e:
-			# todo: make configurable the expired time of cache entry:
-			logSys.warning("Unable to find a corresponding IP address for %s: %s", dns, e)
-			ips = list()
+		ips = list()
+		saveerr = None
+		for fam, ipfam in ((socket.AF_INET, IPAddr.FAM_IPv4), (socket.AF_INET6, IPAddr.FAM_IPv6)):
+			try:
+				for result in socket.getaddrinfo(dns, None, fam, 0, socket.IPPROTO_TCP):
+					ip = IPAddr(result[4][0], ipfam)
+					if ip.isValid:
+						ips.append(ip)
+			except socket.error as e:
+				saveerr = e
+		if not ips and saveerr:
+			logSys.warning("Unable to find a corresponding IP address for %s: %s", dns, saveerr)
+
 		DNSUtils.CACHE_nameToIp.set(dns, ips)
 		return ips
 
@@ -140,6 +143,8 @@ class IPAddr(object):
 
 	CIDR_RAW = -2
 	CIDR_UNSPEC = -1
+	FAM_IPv4 = CIDR_RAW - socket.AF_INET
+	FAM_IPv6 = CIDR_RAW - socket.AF_INET6
 
 	def __new__(cls, ipstr, cidr=CIDR_UNSPEC):
 		# check already cached as IPAddr
@@ -191,7 +196,11 @@ class IPAddr(object):
 		self._raw = ipstr
 		# if not raw - recognize family, set addr, etc.:
 		if cidr != IPAddr.CIDR_RAW:
-			for family in [socket.AF_INET, socket.AF_INET6]:
+			if cidr is not None and cidr < IPAddr.CIDR_RAW:
+				family = [IPAddr.CIDR_RAW - cidr]
+			else:
+				family = [socket.AF_INET, socket.AF_INET6]
+			for family in family:
 				try:
 					binary = socket.inet_pton(family, ipstr)
 					self._family = family
diff --git a/fail2ban/tests/filtertestcase.py b/fail2ban/tests/filtertestcase.py
index 986cf1f0..174152b9 100644
--- a/fail2ban/tests/filtertestcase.py
+++ b/fail2ban/tests/filtertestcase.py
@@ -337,6 +337,11 @@ class IgnoreIP(LogCaptureTestCase):
 		for ip in ipList:
 			self.filter.addIgnoreIP(ip)
 			self.assertFalse(self.filter.inIgnoreIPList(ip))
+		if not unittest.F2B.no_network: # pragma: no cover
+			self.assertLogged(
+				'Unable to find a corresponding IP address for 999.999.999.999',
+				'Unable to find a corresponding IP address for abcdef.abcdef',
+				'Unable to find a corresponding IP address for 192.168.0.', all=True)
 
 	def testIgnoreIPCIDR(self):
 		self.filter.addIgnoreIP('192.168.1.0/25')