diff --git a/datatypes/ni_numbers.py b/datatypes/ni_numbers.py
new file mode 100644
index 0000000..830c4e1
--- /dev/null
+++ b/datatypes/ni_numbers.py
@@ -0,0 +1,40 @@
+'''
+
+This module generates UK National Insurance Numbers.
+
+Format is 2 prefix letters, 6 digits, 1 suffix letter:
+AB123456C
+
+They are sometimes printed with spaces:
+AB 12 34 56 C
+
+This modules doesn't take correct letter prefixing into account,
+it just generates them randomly. But this is probably good
+enough for basic regex-type filters to detect.
+
+'''
+
+from common import helpers
+
+
+class Datatype:
+
+    def __init__(self, cli_object):
+        self.cli = "ni"
+        self.description = "UK National Insurance Numbers"
+        self.filetype = "text"
+        self.datasize = int(cli_object.data_size)
+
+    def create_ni(self):
+        ni_n = helpers.randomNumbers(6)
+        ni_s = (helpers.randomString(3)).upper()
+        ni = ni_s[0:2] + ni_n[0:6] + ni_s[2:3]
+        return ni
+
+    def generate_data(self):
+        print "[*] Generating data..."
+        nis = ''
+        # This is approx 1 meg of ni's (not including ", ")
+        for single_ni in range(0, 100000 * self.datasize):
+            nis += self.create_ni() + ', '
+        return nis