diff --git a/roles/copr/backend/templates/provision/libvirt-new b/roles/copr/backend/templates/provision/libvirt-new
index 447635f5d3..682e6b5fb5 100755
--- a/roles/copr/backend/templates/provision/libvirt-new
+++ b/roles/copr/backend/templates/provision/libvirt-new
@@ -381,22 +381,25 @@ def get_fedora_ipv6_address(pool_id, id_in_pool, dev=False):
     Statically assign IPv6 + Gateway based on id_in_pool.
     """
     gateway = "2620:52:3:1:ffff:ffff:ffff:fffe"
-    base = "2620:52:3:1:dead:beef:cafe:c1"
+    base = "2620:52:3:1:dead:beef:cafe:c"
+
+    # The initial 256 addresses (:c0XX) is reserved for hypervisor machines
+    # itself.
+    start = 0x100
+
+    # each hypervisor has block of 64 IPs
+    block = 64
 
-    offset = 0
-    # 01 => 0, 02 => 1, ...
     hv_id, _, _ = get_hv_identification_from_pool_id(pool_id)
-    # we have block of 256 ipv6 addresses for builder, and 4 hypervisors
-    block = int(256 / 4)
+
     # give 48 IPs to each hv (32 prod, some dev), currently 4*48=192 ips
     offset = hv_id * block
     if not dev:
-        # give the dev only 8 addresses
+        # give the first 8 addresses to Copr dev instance
         offset += 8
 
-    addr_number = offset + int(id_in_pool)
-    addr_number = hex(addr_number).replace("0x", "")
-
+    addr_number = start + offset + int(id_in_pool)
+    addr_number = "{0:#05x}".format(addr_number).replace("0x", "")
     return base + addr_number, gateway