diff --git a/lib/ansible/module_utils/net_tools/nios/api.py b/lib/ansible/module_utils/net_tools/nios/api.py
index 1e9037e7222..4e1a1f6a6d2 100644
--- a/lib/ansible/module_utils/net_tools/nios/api.py
+++ b/lib/ansible/module_utils/net_tools/nios/api.py
@@ -31,6 +31,7 @@ from functools import partial
 from ansible.module_utils._text import to_native
 from ansible.module_utils.six import iteritems
 from ansible.module_utils._text import to_text
+from ansible.module_utils.basic import env_fallback
 
 try:
     from infoblox_client.connector import Connector
@@ -60,17 +61,17 @@ NIOS_IPV6_FIXED_ADDRESS = 'ipv6fixedaddress'
 NIOS_NEXT_AVAILABLE_IP = 'func:nextavailableip'
 
 NIOS_PROVIDER_SPEC = {
-    'host': dict(),
-    'username': dict(),
-    'password': dict(no_log=True),
-    'ssl_verify': dict(type='bool', default=False),
+    'host': dict(fallback=(env_fallback, ['INFOBLOX_HOST'])),
+    'username': dict(fallback=(env_fallback, ['INFOBLOX_USERNAME'])),
+    'password': dict(fallback=(env_fallback, ['INFOBLOX_PASSWORD']), no_log=True),
+    'ssl_verify': dict(type='bool', default=False, fallback=(env_fallback, ['INFOBLOX_SSL_VERIFY'])),
     'silent_ssl_warnings': dict(type='bool', default=True),
-    'http_request_timeout': dict(type='int', default=10),
+    'http_request_timeout': dict(type='int', default=10, fallback=(env_fallback, ['INFOBLOX_HTTP_REQUEST_TIMEOUT'])),
     'http_pool_connections': dict(type='int', default=10),
     'http_pool_maxsize': dict(type='int', default=10),
-    'max_retries': dict(type='int', default=3),
-    'wapi_version': dict(default='2.1'),
-    'max_results': dict(type='int', default=1000)
+    'max_retries': dict(type='int', default=3, fallback=(env_fallback, ['INFOBLOX_MAX_RETRIES'])),
+    'wapi_version': dict(default='2.1', fallback=(env_fallback, ['INFOBLOX_WAP_VERSION'])),
+    'max_results': dict(type='int', default=1000, fallback=(env_fallback, ['INFOBLOX_MAX_RETRIES']))
 }
 
 
diff --git a/lib/ansible/utils/module_docs_fragments/nios.py b/lib/ansible/utils/module_docs_fragments/nios.py
index 34b28551127..b05de60c1da 100644
--- a/lib/ansible/utils/module_docs_fragments/nios.py
+++ b/lib/ansible/utils/module_docs_fragments/nios.py
@@ -70,7 +70,8 @@ options:
           - Specifies the version of WAPI to use
           - Value can also be specified using C(INFOBLOX_WAP_VERSION) environment
             variable.
-        default: 1.4
+          - Until ansible 2.8 the default WAPI was 1.4
+        default: 2.1
       max_results:
         description:
           - Specifies the maximum number of objects to be returned,