diff --git a/spec/number_spec.cr b/spec/number_spec.cr
index f31a7bc..69c2fd3 100644
--- a/spec/number_spec.cr
+++ b/spec/number_spec.cr
@@ -59,4 +59,9 @@ describe Faker::Number do
     (random_number >= 1).should be_true
     (random_number <= 100).should be_true
   end
+
+  it "hexadecimal" do
+    Faker::Number.hexadecimal(4).match(/[0-9a-f]{4}/).should_not eq nil
+    Faker::Number.hexadecimal(7).match(/[0-9a-f]{7}/).should_not eq nil
+  end
 end
diff --git a/src/faker/number.cr b/src/faker/number.cr
index 2b48111..542e504 100644
--- a/src/faker/number.cr
+++ b/src/faker/number.cr
@@ -28,6 +28,12 @@ module Faker
       less_than_zero(random_number)
     end
 
+    def self.hexadecimal(digits)
+      hex = ""
+      digits.times { hex += rand(15).to_s(16) }
+      hex
+    end
+
     private def self.greater_than_zero(number)
       if number > 0
         number