diff --git a/config/filter.d/nginx-limit-req.conf b/config/filter.d/nginx-limit-req.conf
index 589d3d78..13cf75c2 100644
--- a/config/filter.d/nginx-limit-req.conf
+++ b/config/filter.d/nginx-limit-req.conf
@@ -39,7 +39,7 @@ ngx_limit_req_zones = [^"]+
 # failregex = ^\s*\[error\] \d+#\d+: \*\d+ limiting requests, excess: [\d\.]+ by zone "(?:%(ngx_limit_req_zones)s)", client: <HOST>, server: \S*, request: "\S+ \S+ HTTP/\d+\.\d+", host: "\S+"(, referrer: "\S+")?\s*$
 
 # Shortly, much faster and stable version of regexp:
-failregex = ^\s*\[error\] \d+#\d+: \*\d+ limiting requests, excess: [\d\.]+ by zone "(?:%(ngx_limit_req_zones)s)", client: <HOST>
+failregex = ^\s*\[error\] \d+#\d+: \*\d+ limiting requests, excess: [\d\.]+ by zone "(?:%(ngx_limit_req_zones)s)", client: <HOST>,
 
 ignoreregex = 
 
diff --git a/fail2ban/server/failregex.py b/fail2ban/server/failregex.py
index 7c512609..7c51ddb8 100644
--- a/fail2ban/server/failregex.py
+++ b/fail2ban/server/failregex.py
@@ -25,6 +25,7 @@ import re
 import sre_constants
 import sys
 
+from .ipdns import IPAddr
 
 ##
 # Regular expression class.
@@ -72,12 +73,12 @@ class Regex:
 	def _resolveHostTag(regex, useDns="yes"):
 		# separated ipv4:
 		r_host = []
-		r = r"""(?:::f{4,6}:)?(?P<ip4>(?:\d{1,3}\.){3}\d{1,3})"""
+		r = r"""(?:::f{4,6}:)?(?P<ip4>%s)""" % (IPAddr.IP_4_RE,)
 		regex = regex.replace("<IP4>", r); # self closed
 		regex = regex.replace("<F-IP4/>", r); # closed
 		r_host.append(r)
 		# separated ipv6:
-		r = r"""(?P<ip6>(?:[0-9a-fA-F]{1,4}::?|::){1,7}(?:[0-9a-fA-F]{1,4}?|(?<=:):))"""
+		r = r"""(?P<ip6>%s)""" % (IPAddr.IP_6_RE,)
 		regex = regex.replace("<IP6>", r); # self closed
 		regex = regex.replace("<F-IP6/>", r); # closed
 		r_host.append(r"""\[?%s\]?""" % (r,)); # enclose ipv6 in optional [] in host-regex
diff --git a/fail2ban/server/ipdns.py b/fail2ban/server/ipdns.py
index cba08d0c..f8db6a04 100644
--- a/fail2ban/server/ipdns.py
+++ b/fail2ban/server/ipdns.py
@@ -124,8 +124,11 @@ class DNSUtils:
 class IPAddr(object):
 	"""Encapsulate functionality for IPv4 and IPv6 addresses
 	"""
+
+	IP_4_RE = r"""(?:\d{1,3}\.){3}\d{1,3}"""
+	IP_6_RE = r"""(?:[0-9a-fA-F]{1,4}::?|::){1,7}(?:[0-9a-fA-F]{1,4}|(?<=:):)"""
 	IP_4_6_CRE = re.compile(
-	  r"""^(?:(?P<IPv4>(?:\d{1,3}\.){3}\d{1,3})|\[?(?P<IPv6>(?:[0-9a-fA-F]{1,4}::?|::){1,7}(?:[0-9a-fA-F]{1,4}|(?<=:):))\]?)$""")
+	  r"""^(?:(?P<IPv4>%s)|\[?(?P<IPv6>%s)\]?)$""" % (IP_4_RE, IP_6_RE))
 	# An IPv4 compatible IPv6 to be reused (see below)
 	IP6_4COMPAT = None
 
diff --git a/fail2ban/tests/files/logs/nginx-limit-req b/fail2ban/tests/files/logs/nginx-limit-req
index 68f1b239..9a77b45f 100644
--- a/fail2ban/tests/files/logs/nginx-limit-req
+++ b/fail2ban/tests/files/logs/nginx-limit-req
@@ -4,3 +4,9 @@
 
 # failJSON: { "time": "2015-10-29T19:24:05", "match": true , "host": "192.0.2.0" }
 2015/10/29 19:24:05 [error] 12684#12684: *22174 limiting requests, excess: 1.495 by zone "one", client: 192.0.2.0, server: example.com, request: "GET /index.php HTTP/1.1", host: "example.com", referrer: "https://example.com"
+
+# failJSON: { "time": "2016-09-30T08:36:06", "match": true, "host": "13.123.1.123" }
+2016/09/30 08:36:06 [error] 22923#0: *4758725916 limiting requests, excess: 15.243 by zone "one", client: 13.123.1.123, server: example.com, request: "GET / HTTP/1.1", host: "example.com"
+
+# failJSON: { "time": "2016-09-30T08:36:06", "match": true, "host": "2606:2800:220:1:248:1893:25c8:1946" }
+2016/09/30 08:36:06 [error] 22923#0: *4758725916 limiting requests, excess: 15.243 by zone "one", client: 2606:2800:220:1:248:1893:25c8:1946, server: example.com, request: "GET / HTTP/1.1", host: "example.com"