diff --git a/ereuse_devicehub/migrations/versions/6a2a939d5668_drop_unique_org_for_tag.py b/ereuse_devicehub/migrations/versions/6a2a939d5668_drop_unique_org_for_tag.py
index 50a803a9..17e0290e 100644
--- a/ereuse_devicehub/migrations/versions/6a2a939d5668_drop_unique_org_for_tag.py
+++ b/ereuse_devicehub/migrations/versions/6a2a939d5668_drop_unique_org_for_tag.py
@@ -23,13 +23,34 @@ def get_inv():
         raise ValueError("Inventory value is not specified")
     return INV
 
+
+def upgrade_data():
+    con = op.get_bind()
+    tags = con.execute(f"select id from {get_inv()}.tag")
+    i = 1
+    for c in tags:
+        id_tag = c.id
+        internal_id = i
+        i += 1
+        sql = f"update {get_inv()}.tag set internal_id='{internal_id}' where id='{id_tag}';"
+        con.execute(sql)
+
+    sql = f"CREATE SEQUENCE {get_inv()}.tag_internal_id_seq START {i};"
+    con.execute(sql)
+
+
 def upgrade():
     op.drop_constraint('one tag id per organization', 'tag', schema=f'{get_inv()}')
     op.drop_constraint('one secondary tag per organization', 'tag', schema=f'{get_inv()}')
     op.create_primary_key('one tag id per owner',  'tag', ['id', 'owner_id'], schema=f'{get_inv()}'),
     op.create_unique_constraint('one secondary tag per owner',  'tag', ['secondary', 'owner_id'], schema=f'{get_inv()}'),
-    op.add_column('tag', sa.Column('internal_id', sa.BigInteger(), nullable=False,
-                              comment='The identifier of the tag for this database. Used only\n    internally for software; users should not use this.\n'), schema=f'{get_inv()}')
+    op.add_column('tag', sa.Column('internal_id', sa.BigInteger(), nullable=True,
+                              comment='The identifier of the tag for this database. Used only\n internally for software; users should not use this.\n'), schema=f'{get_inv()}')
+
+    upgrade_data()
+
+    op.alter_column('tag', sa.Column('internal_id', sa.BigInteger(), nullable=False,
+                              comment='The identifier of the tag for this database. Used only\n internally for software; users should not use this.\n'), schema=f'{get_inv()}')
 
 
 def downgrade():
@@ -38,5 +59,4 @@ def downgrade():
     op.create_primary_key('one tag id per organization',  'tag', ['id', 'org_id'], schema=f'{get_inv()}'),
     op.create_unique_constraint('one secondary tag per organization',  'tag', ['secondary', 'org_id'], schema=f'{get_inv()}'),
     op.drop_column('tag', 'internal_id', schema=f'{get_inv()}')
-    op.drop_column('tag', 'internal_id', schema=f'{get_inv()}')
     op.execute(f"DROP SEQUENCE {get_inv()}.tag_internal_id_seq;")
diff --git a/ereuse_devicehub/resources/tag/model.py b/ereuse_devicehub/resources/tag/model.py
index 757f02ae..c52cdf8a 100644
--- a/ereuse_devicehub/resources/tag/model.py
+++ b/ereuse_devicehub/resources/tag/model.py
@@ -15,6 +15,7 @@ from ereuse_devicehub.resources.agent.models import Organization
 from ereuse_devicehub.resources.device.models import Device
 from ereuse_devicehub.resources.models import Thing
 from ereuse_devicehub.resources.user.models import User
+from ereuse_devicehub.resources.utils import hascode
 
 
 class Tags(Set['Tag']):
@@ -25,8 +26,10 @@ class Tags(Set['Tag']):
         return ', '.join(format(tag, format_spec) for tag in self).strip()
 
 
+
+
 class Tag(Thing):
-    internal_id = Column(BigInteger, Sequence('tag_internal_id_seq'), unique=True, nulable=False)
+    internal_id = Column(BigInteger, Sequence('tag_internal_id_seq'), unique=True, nullable=False)
     internal_id.comment = """The identifier of the tag for this database. Used only
     internally for software; users should not use this.
     """
@@ -113,7 +116,7 @@ class Tag(Thing):
     def url(self) -> urlutils.URL:
         """The URL where to GET this device."""
         # todo this url only works for printable internal tags
-        return urlutils.URL(url_for_resource(Tag, item_id=self.id))
+        return urlutils.URL(url_for_resource(Tag, item_id=self.code))
 
     @property
     def printable(self) -> bool:
@@ -129,6 +132,10 @@ class Tag(Thing):
         """Return a SQLAlchemy filter expression for printable queries."""
         return cls.org_id == Organization.get_default_org_id()
 
+    @property
+    def code(self) -> str:
+        return hascode.encode(self.internal_id)
+
     def delete(self):
         """Deletes the tag.
 
@@ -157,7 +164,7 @@ class TagLinked(ValidationError):
         message = 'The tag {} is linked to device {}.'.format(tag.id, tag.device.id)
         super().__init__(message, field_names=['device'])
 
-        
+
 class TagUnnamed(ValidationError):
     def __init__(self, id):
         message = 'This tag {} is unnamed tag. It is imposible delete.'.format(id)
diff --git a/ereuse_devicehub/resources/tag/schema.py b/ereuse_devicehub/resources/tag/schema.py
index 7db4fe0d..e1c8b608 100644
--- a/ereuse_devicehub/resources/tag/schema.py
+++ b/ereuse_devicehub/resources/tag/schema.py
@@ -28,3 +28,4 @@ class Tag(Thing):
     secondary = SanitizedStr(lower=True, description=m.Tag.secondary.comment)
     printable = Boolean(dump_only=True, decsription=m.Tag.printable.__doc__)
     url = URL(dump_only=True, description=m.Tag.url.__doc__)
+    code = SanitizedStr(dump_only=True, description=m.Tag.internal_id.comment)
diff --git a/ereuse_devicehub/resources/tag/view.py b/ereuse_devicehub/resources/tag/view.py
index 75f575f5..5416fd2a 100644
--- a/ereuse_devicehub/resources/tag/view.py
+++ b/ereuse_devicehub/resources/tag/view.py
@@ -6,14 +6,16 @@ from teal.resource import View, url_for_resource
 from ereuse_devicehub import auth
 from ereuse_devicehub.db import db
 from ereuse_devicehub.query import things_response
+from ereuse_devicehub.resources.utils import hascode
 from ereuse_devicehub.resources.device.models import Device
 from ereuse_devicehub.resources.tag import Tag
 
 
 class TagView(View):
-    def one(self, id):
+    def one(self, code):
         """Gets the device from the named tag, /tags/namedtag."""
-        tag = Tag.from_an_id(id).one()  # type: Tag
+        internal_id = hascode.decode(code.upper()) or -1
+        tag = Tag.query.filter_by(internal_id=internal_id).one()  # type: Tag
         if not tag.device:
             raise TagNotLinked(tag.id)
         return redirect(location=url_for_resource(Device, tag.device.id))
diff --git a/ereuse_devicehub/resources/utils.py b/ereuse_devicehub/resources/utils.py
new file mode 100644
index 00000000..1ac37b51
--- /dev/null
+++ b/ereuse_devicehub/resources/utils.py
@@ -0,0 +1,9 @@
+from hashids import Hashids
+from decouple import config
+
+ALPHABET = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ'
+SECRET = config('TAG_HASH', '')
+hascode = Hashids(SECRET, min_length=5, alphabet=ALPHABET)
+
+def hashids(id):
+    return hascode.encode(id)
diff --git a/tests/test_tag.py b/tests/test_tag.py
index ce76194c..040b2751 100644
--- a/tests/test_tag.py
+++ b/tests/test_tag.py
@@ -26,6 +26,7 @@ from tests.conftest import file
 @pytest.mark.usefixtures(conftest.app_context.__name__)
 def test_create_tag(user: UserClient):
     """Creates a tag specifying a custom organization."""
+    # import pdb; pdb.set_trace()
     org = Organization(name='bar', tax_id='bartax')
     tag = Tag(id='bar-1', org=org, provider=URL('http://foo.bar'), owner_id=user.user['id'])
     db.session.add(tag)
@@ -33,7 +34,7 @@ def test_create_tag(user: UserClient):
     tag = Tag.query.one()
     assert tag.id == 'bar-1'
     assert tag.provider == URL('http://foo.bar')
-    res, _ = user.get(res=Tag, item=tag.id, status=422)
+    res, _ = user.get(res=Tag, item=tag.code, status=422)
     assert res['type'] == 'TagNotLinked'