diff --git a/src/main/java/com/hubspot/jinjava/lib/filter/IpAddrFilter.java b/src/main/java/com/hubspot/jinjava/lib/filter/IpAddrFilter.java
index 4412dc30f..b1c7768ea 100644
--- a/src/main/java/com/hubspot/jinjava/lib/filter/IpAddrFilter.java
+++ b/src/main/java/com/hubspot/jinjava/lib/filter/IpAddrFilter.java
@@ -54,13 +54,14 @@
 )
 public class IpAddrFilter implements Filter {
   private static final Pattern IP4_PATTERN = Pattern.compile(
-    "(([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\.){3}([01]?\\d\\d?|2[0-4]\\d|25[0-5])"
+    "((0*1?\\d\\d?|0*2[0-4]\\d|0*25[0-5])\\.){3}(0*1?\\d\\d?|0*2[0-4]\\d|0*25[0-5])(/0*([1-2]?\\d|3[0-2])?)?"
   );
   private static final Pattern IP6_PATTERN = Pattern.compile(
-    "^(?:[0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}$"
+    "^(?:[0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}(/0*(\\d{1,2}|1[0-1]\\d|12[0-8])?)?$"
   );
   private static final Pattern IP6_COMPRESSED_PATTERN = Pattern.compile(
-    "^((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?)::((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?)$"
+    "^((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?)::((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?)" +
+    "(/0*(\\d{1,2}|1[0-1]\\d|12[0-8])?)?$"
   );
 
   private static final Splitter PREFIX_SPLITTER = Splitter.on('/');
diff --git a/src/test/java/com/hubspot/jinjava/lib/filter/IpAddrFilterTest.java b/src/test/java/com/hubspot/jinjava/lib/filter/IpAddrFilterTest.java
index 6e1bd7a4a..65b1fb131 100644
--- a/src/test/java/com/hubspot/jinjava/lib/filter/IpAddrFilterTest.java
+++ b/src/test/java/com/hubspot/jinjava/lib/filter/IpAddrFilterTest.java
@@ -209,12 +209,17 @@ public void itAddsErrorOnInvalidFunctionName() {
 
   @Test
   public void itFiltersValidIpv4Addresses() {
-    List<Object> validAddresses = Arrays.asList("255.182.100.1", "   128.0.0.1   ");
+    List<Object> validAddresses = Arrays.asList(
+      "255.182.100.1",
+      "   128.0.0.1   ",
+      "192.168.1.0/000024"
+    );
     List<Object> invalidAddresses = Arrays.asList(
       "255.182.100.abc",
       "125.512.100.1",
       "125.512.100.1.1",
       "125.512.100",
+      "192.168.1.1/33",
       104,
       "1200:0000:AB00:1234:0000:2552:7777:1313",
       "1200::AB00:1234::2552:7777:1313",
@@ -233,7 +238,10 @@ public void itFiltersValidIpv4Addresses() {
   public void itFiltersValidIpv6Addresses() {
     List<Object> validAddresses = Arrays.asList(
       "1200:0000:AB00:1234:0000:2552:7777:1313",
-      "2000::"
+      "2000::",
+      "2000::/99",
+      "1200:0000:AB00:1234:0000:2552:7777:1313/0000021",
+      "1200:0000:AB00:1234:0000:2552:7777:1313/128"
     );
     List<Object> invalidAddresses = Arrays.asList(
       "255.182.100.abc",
@@ -243,6 +251,7 @@ public void itFiltersValidIpv6Addresses() {
       104,
       "1200:0000:AB00:1234:O000:2552:7777:1313",
       "1200::AB00:1234::2552:7777:1313:1232",
+      "1200:0000:AB00:1234:0000:2552:7777:1313/132",
       "321",
       null,
       true