diff --git a/vocabulary/format-assertion/src/main/java/io/github/sebastiantoepfer/jsonschema/vocabulary/formatassertion/Formats.java b/vocabulary/format-assertion/src/main/java/io/github/sebastiantoepfer/jsonschema/vocabulary/formatassertion/Formats.java
index 7557fb2..97e709f 100644
--- a/vocabulary/format-assertion/src/main/java/io/github/sebastiantoepfer/jsonschema/vocabulary/formatassertion/Formats.java
+++ b/vocabulary/format-assertion/src/main/java/io/github/sebastiantoepfer/jsonschema/vocabulary/formatassertion/Formats.java
@@ -26,6 +26,7 @@
 import io.github.sebastiantoepfer.jsonschema.vocabulary.formatassertion.rfc.Rfc;
 import io.github.sebastiantoepfer.jsonschema.vocabulary.formatassertion.rfc.Rfc2673;
 import io.github.sebastiantoepfer.jsonschema.vocabulary.formatassertion.rfc.Rfc3339;
+import io.github.sebastiantoepfer.jsonschema.vocabulary.formatassertion.rfc.Rfc4291;
 import io.github.sebastiantoepfer.jsonschema.vocabulary.formatassertion.rfc.Rfc5321;
 import java.util.List;
 import java.util.Map;
@@ -46,7 +47,8 @@ final class Formats {
             .map(entry -> new RfcBasedFormat(entry.getKey(), new Rfc3339(), entry.getValue())),
         Stream.of(
             new RfcBasedFormat("email", new Rfc5321(), "mailbox"),
-            new RfcBasedFormat("ipv4", new Rfc2673(), "dotted-quad")
+            new RfcBasedFormat("ipv4", new Rfc2673(), "dotted-quad"),
+            new RfcBasedFormat("ipv6", new Rfc4291(), "address")
         )
     )
         .map(Format.class::cast)
diff --git a/vocabulary/format-assertion/src/main/java/io/github/sebastiantoepfer/jsonschema/vocabulary/formatassertion/rfc/Rfc4291.java b/vocabulary/format-assertion/src/main/java/io/github/sebastiantoepfer/jsonschema/vocabulary/formatassertion/rfc/Rfc4291.java
new file mode 100644
index 0000000..88e6853
--- /dev/null
+++ b/vocabulary/format-assertion/src/main/java/io/github/sebastiantoepfer/jsonschema/vocabulary/formatassertion/rfc/Rfc4291.java
@@ -0,0 +1,47 @@
+/*
+ * The MIT License
+ *
+ * Copyright 2024 sebastian.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package io.github.sebastiantoepfer.jsonschema.vocabulary.formatassertion.rfc;
+
+import java.util.Map;
+import java.util.Optional;
+import java.util.regex.Pattern;
+
+public final class Rfc4291 implements Rfc {
+
+    private static final Map<String, Pattern> RULES = Map.of(
+        "address",
+        Pattern.compile(
+            "^(([0-9A-Fa-f]{1,4}(\\:[0-9A-Fa-f]{1,4}){7})|" +
+            "([0-9A-Fa-f]{1,4}(\\:[0-9A-Fa-f]{1,4}){0,5})*\\:\\:([0-9A-Fa-f]{1,4}(\\:[0-9A-Fa-f]{1,4}){0,5})*|" +
+            "(((([0-9A-Fa-f]{1,4}(\\:[0-9A-Fa-f]{1,4}){5})\\:)|" +
+            "([0-9A-Fa-f]{1,4}(\\:[0-9A-Fa-f]{1,4}){0,4})*\\:\\:([0-9A-Fa-f]{1,4}(\\:[0-9A-Fa-f]{1,4}){0,4})*)" +
+            "\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}))$"
+        )
+    );
+
+    @Override
+    public Optional<Rule> findRuleByName(final String ruleName) {
+        return Optional.ofNullable(RULES.get(ruleName)).map(RegExRule::new);
+    }
+}
diff --git a/vocabulary/format-assertion/src/main/resources/rfc/rfc4291 b/vocabulary/format-assertion/src/main/resources/rfc/rfc4291
new file mode 100644
index 0000000..e561c59
--- /dev/null
+++ b/vocabulary/format-assertion/src/main/resources/rfc/rfc4291
@@ -0,0 +1,7 @@
+; selfmade :( -> not effectiv
+dotted-quad      = decbyte "." decbyte "." decbyte "." decbyte
+decbyte          = 1*3DIGIT
+address          = (hexbytes 7(":" hexbytes) ) / *(hexbytes *5(":" hexbytes)) zeros *(hexbytes *5(":" hexbytes)) / ((((hexbytes 5(":" hexbytes) )  ":") / *(hexbytes *4(":" hexbytes)) zeros *(hexbytes *4(":" hexbytes))) dotted-quad)
+zeros            = "::"
+hexbytes         = 1*4hexValue
+hexValue         = DIGIT / %x41-46 / %x61-66
diff --git a/vocabulary/format-assertion/src/test/java/io/github/sebastiantoepfer/jsonschema/vocabulary/formatassertion/FormatsTest.java b/vocabulary/format-assertion/src/test/java/io/github/sebastiantoepfer/jsonschema/vocabulary/formatassertion/FormatsTest.java
index 77e62a2..0f299e3 100644
--- a/vocabulary/format-assertion/src/test/java/io/github/sebastiantoepfer/jsonschema/vocabulary/formatassertion/FormatsTest.java
+++ b/vocabulary/format-assertion/src/test/java/io/github/sebastiantoepfer/jsonschema/vocabulary/formatassertion/FormatsTest.java
@@ -74,4 +74,26 @@ void should_found_ipv4Format() {
         assertThat(new Formats().findByName("ipv4").applyTo("161.111.26.9"), is(true));
         assertThat(new Formats().findByName("ipv4").applyTo("125.158.4589.1"), is(false));
     }
+
+    @Test
+    void should_found_ipv6Format() {
+        assertThat(new Formats().findByName("ipv6").applyTo("ABCD:EF01:2345:6789:ABCD:EF01:2345:6789"), is(true));
+        assertThat(new Formats().findByName("ipv6").applyTo("2001:DB8:0:0:8:800:200C:417A"), is(true));
+        assertThat(new Formats().findByName("ipv6").applyTo("FF01:0:0:0:0:0:0:101"), is(true));
+        assertThat(new Formats().findByName("ipv6").applyTo("0:0:0:0:0:0:0:1"), is(true));
+        assertThat(new Formats().findByName("ipv6").applyTo("0:0:0:0:0:0:0:0"), is(true));
+        //compressed
+        assertThat(new Formats().findByName("ipv6").applyTo("2001:DB8::8:800:200C:417A"), is(true));
+        assertThat(new Formats().findByName("ipv6").applyTo("FF01::101"), is(true));
+        assertThat(new Formats().findByName("ipv6").applyTo("::1"), is(true));
+        assertThat(new Formats().findByName("ipv6").applyTo("::"), is(true));
+        //ipv4 representation
+        assertThat(new Formats().findByName("ipv6").applyTo("0:0:0:0:0:0:13.1.68.3"), is(true));
+        assertThat(new Formats().findByName("ipv6").applyTo("0:0:0:0:0:FFFF:129.144.52.38"), is(true));
+        //ipv4 representation compressed
+        assertThat(new Formats().findByName("ipv6").applyTo("::13.1.68.3"), is(true));
+        assertThat(new Formats().findByName("ipv6").applyTo("::FFFF:129.144.52.38"), is(true));
+        //ipv4 only -> invalid!
+        assertThat(new Formats().findByName("ipv6").applyTo("125.158.4589.1"), is(false));
+    }
 }