diff --git a/geocoder/ip-addresses/README.md b/geocoder/ip-addresses/README.md
new file mode 100644
index 0000000..5702d3c
--- /dev/null
+++ b/geocoder/ip-addresses/README.md
@@ -0,0 +1,16 @@
+IP address geocoder
+===============
+
+### Function
+
+### Creation steps
+
+1. upload a new dataset to the geocoder table, call it latest_ip_address_locations
+2. Run the sql/build_data_table script to update the table
+
+### Data Sources
+
+### Preparation details
+
+
+
diff --git a/geocoder/ip-addresses/sql/build_data_table.sql b/geocoder/ip-addresses/sql/build_data_table.sql
new file mode 100644
index 0000000..dbf5dc3
--- /dev/null
+++ b/geocoder/ip-addresses/sql/build_data_table.sql
@@ -0,0 +1,9 @@
+
+---- Postal Code Polygon table ---
+--- ---
+
+-- Clear table
+
+DELETE FROM ip_address_locations;
+INSERT INTO ip_address_locations (the_geom, network_start_ip) SELECT the_geom, network_start_ip::inet FROM latest_ip_address_locations;
+DROP TABLE latest_ip_address_locations;
diff --git a/geocoder/ip-addresses/sql/geocoder.sql b/geocoder/ip-addresses/sql/geocoder.sql
new file mode 100644
index 0000000..3935cb5
--- /dev/null
+++ b/geocoder/ip-addresses/sql/geocoder.sql
@@ -0,0 +1,31 @@
+CREATE OR REPLACE FUNCTION geocode_ip(ip text[])
+  RETURNS SETOF geocode_ip_v1 AS $$
+  DECLARE 
+    ret geocode_ip_v1%rowtype;
+    n TEXT;
+    new_ips INET[];
+    old_ips TEXT[];
+  BEGIN
+  FOR n IN SELECT unnest(ip) LOOP
+    BEGIN
+      IF family(n::inet)=6 THEN
+        new_ips := array_append(new_ips, n::inet);
+        old_ips := array_append(old_ips, n);
+      ELSE
+        new_ips := array_append(new_ips, ('::ffff:'||n)::inet);
+        old_ips := array_append(old_ips, n);
+      END IF;
+    EXCEPTION WHEN OTHERS THEN
+      SELECT n AS q, NULL as geom, FALSE as success INTO ret;
+      RETURN NEXT ret;
+    END;
+  END LOOP;
+  FOR ret IN WITH ips AS (SELECT unnest(old_ips) s, unnest(new_ips) net),
+    matches AS (SELECT s, (SELECT the_geom FROM ip_address_locations WHERE network_start_ip <= ips.net ORDER BY network_start_ip DESC LIMIT 1) geom FROM ips)
+    SELECT s, geom, CASE WHEN geom IS NULL THEN FALSE ELSE TRUE END AS success FROM matches
+    LOOP
+    RETURN NEXT ret;
+  END LOOP;
+  RETURN;
+END
+$$ LANGUAGE 'plpgsql' SECURITY DEFINER;
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diff --git a/geocoder/postal-codes/README.md b/geocoder/postal-codes/README.md
index 209ad88..71ff354 100644
--- a/geocoder/postal-codes/README.md
+++ b/geocoder/postal-codes/README.md
@@ -17,13 +17,3 @@ French polygons - http://www.data.gouv.fr/dataset/fond-de-carte-des-codes-postau
 
 
 ### Preparation details
-
-## Admin0_synonyms
-
-
-### Ranks
-
-| rank number | origin data                 | origin column | description          |
-|-------------|-----------------------------|---------------|----------------------|
-
-__notes:__ 
\ No newline at end of file