diff --git a/src/formats/index.ts b/src/formats/index.ts
index bc14475..96c9480 100644
--- a/src/formats/index.ts
+++ b/src/formats/index.ts
@@ -1,3 +1,4 @@
+import { inferMAC, JSONMACFormat } from './mac';
 // This is the order the formats will be run in
 import { inferDatetime, JSONDateTimeFormat } from "./datetime";
 import { inferTimestamp, JSONTimestampFormat } from "./timestamp";
@@ -63,7 +64,8 @@ export type JSONStringFormat =
   | JSONSemverFormat
   | JSONJWTStringFormat
   | JSONColorFormat
-  | JSONCreditCardFormat;
+  | JSONCreditCardFormat
+  | JSONMACFormat;
 
 const formats = [
   inferUri,
@@ -86,6 +88,7 @@ const formats = [
   inferJWT,
   inferColor,
   inferCreditCard,
+  inferMAC,
 ];
 
 export function inferFormat(value: string): JSONStringFormat | undefined {
diff --git a/src/formats/mac.ts b/src/formats/mac.ts
new file mode 100644
index 0000000..151e885
--- /dev/null
+++ b/src/formats/mac.ts
@@ -0,0 +1,27 @@
+export type JSONMACFormat = {
+  name: "mac";
+  variant: "EUI-48" | "EUI-64";
+  splitter: ":" | "." | "-";
+};
+
+const macRegexDDot = /^[a-fA-F0-9]{2}(:[a-fA-F0-9]{2}){5}$/;
+const macRegexDot = /^[a-fA-F0-9]{2}(\.[a-fA-F0-9]{2}){5}$/;
+const macRegexDash = /^[a-fA-F0-9]{2}(-[a-fA-F0-9]{2}){5}$/;
+
+const mac64RegexDDot = /^[a-fA-F0-9]{2}(:[a-fA-F0-9]{2}){7}$/;
+const mac64RegexDot = /^[a-fA-F0-9]{2}(.[a-fA-F0-9]{2}){7}$/;
+const mac64RegexDash = /^[a-fA-F0-9]{2}(-[a-fA-F0-9]{2}){7}$/;
+
+export function inferMAC(value: string): JSONMACFormat | undefined {
+  if (value.length === 17) {
+    if (macRegexDDot.exec(value)) return { name: "mac", variant: "EUI-48", splitter: ":" };
+    else if (macRegexDot.exec(value)) return { name: "mac", variant: "EUI-48", splitter: "." };
+    else if (macRegexDash.exec(value)) return { name: "mac", variant: "EUI-48", splitter: "-" };
+  } else if (value.length === 23) {
+    if (mac64RegexDDot.exec(value)) return { name: "mac", variant: "EUI-64", splitter: ":" };
+    else if (mac64RegexDot.exec(value)) return { name: "mac", variant: "EUI-64", splitter: "." };
+    else if (mac64RegexDash.exec(value)) return { name: "mac", variant: "EUI-64", splitter: "-" };
+  }
+
+  return undefined;
+}
diff --git a/tests/stringFormats.test.ts b/tests/stringFormats.test.ts
index cf339ae..c00e5c0 100644
--- a/tests/stringFormats.test.ts
+++ b/tests/stringFormats.test.ts
@@ -824,6 +824,54 @@ describe("credit cards", () => {
   );
 });
 
+describe("mac", () => {
+  test.each([
+    "38:EE:4A:47:3A:36",
+    "ad:af:bd:71:12:87",
+  ])("%p should be infered as being a MAC address", (value) => {
+    expect(inferType(value)).toEqual({
+      name: "string",
+      value,
+      format: {
+        name: "mac",
+        variant: "EUI-48",
+        splitter: ":"
+      },
+    });
+  });
+
+  test.each([
+    "38-EE-4A-47-3A-36",
+    "ad-af-bd-71-12-87",
+  ])("%p should be infered as being a MAC address", (value) => {
+    expect(inferType(value)).toEqual({
+      name: "string",
+      value,
+      format: {
+        name: "mac",
+        variant: "EUI-48",
+        splitter: "-"
+      },
+    });
+  });
+
+  test.each([
+    "38.EE.4A.47.3A.36",
+    "ad.af.bd.71.12.87",
+  ])("%p should be infered as being a MAC address", (value) => {
+    expect(inferType(value)).toEqual({
+      name: "string",
+      value,
+      format: {
+        name: "mac",
+        variant: "EUI-48",
+        splitter: "."
+      },
+    });
+  });
+});
+
+
 describe("without format", () => {
   test.each(["46", "2244994945", "1212092628029698048"])(
     "%p should be inferred as having no format",